JP6911298B2 - Golf club fitting equipment, methods and programs - Google Patents

Description

The present invention relates to fitting devices, methods and programs for selecting golf clubs suitable for golfers, especially shafts.

Conventionally, various fitting methods have been proposed in which a golfer is made to test-hit a test club, the operation is measured by a measuring device, and a golf club suitable for the golfer is selected based on the measured value. As one of them, Patent Document 1 discloses a fitting method for selecting a shaft of a golf club suitable for a golfer. Specifically, in Patent Document 1, first, the flexural rigidity of the shaft suitable for a golfer is determined based on the measured value by the test club. Then, a shaft that matches the value of the flexural rigidity is extracted from a large number of shafts registered in the database. Such a method is highly expected as a technique for improving the accuracy of shaft fitting.

Japanese Unexamined Patent Publication No. 2013-226375

By the way, in the method of Patent Document 1, it is fully assumed that a large number of shafts having similar bending rigidity are registered in the database. Then, it may not be possible to sufficiently narrow down the shaft suitable for the golfer only by determining the bending rigidity suitable for the golfer. In particular, there are many cases where there are many shafts having similar bending rigidity but different weight bands, and it may be difficult to determine which weight band shaft should be selected.

In this regard, in Patent Document 1, in addition to the flexural rigidity described above, the shaft is selected based on the weight of the golf club normally used by golfers (hereinafter referred to as the weight of my club). Specifically, the shaft is selected so that the newly proposed weight of the golf club is ± 5 g of the weight of my club. That is, if the weight of the newly used golf club changes significantly from the weight of the my club, it may be difficult to take the timing or swing, and the golfer's performance may deteriorate. In this respect, it can be said that the method of Patent Document 1 in which the change in weight from the My Club weight is restricted is excellent.

However, it is possible that the weight of my club is not suitable for the golfer in the first place, that is, it may be over-engineered or under-engineered. In such a case, in the method of Patent Document 1, even if the feeling is improved, the trajectory may not be improved or the feeling may not match.

An object of the present invention is to provide a fitting device, a method and a program for accurately selecting a golf club suitable for a golfer.

The fitting device according to the first aspect is a fitting device for selecting a golf club suitable for a golfer, and includes an acquisition unit that acquires a measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and the above. A calculation unit that calculates the first swing index and the second swing index related to the swing motion based on the measured value, and a golf club swingability index suitable for the golfer according to the size of the first swing index. The optimum swingability index is determined, and the optimum rigidity index indicating the rigidity of the shaft suitable for the golfer is determined according to the size of the second swing index, and the optimum swingability index. And a selection unit for selecting at least one of a golf club and a shaft that matches the optimum rigidity index.

The fitting device according to the second viewpoint is a fitting device according to the first viewpoint, and the calculation unit calculates a plurality of types of the first swing index. The determination unit determines the optimum swingability index according to the size of the plurality of types of first swing indexes.

The fitting device according to the third viewpoint is a fitting device according to the first viewpoint or the second viewpoint, and the first swing index includes an index indicating the power output by the golfer's arm during the swing operation, and the swing. Includes at least one of an index indicating the power input to the test club during operation, an index indicating energy exerted by the golfer during the swing operation, and an index indicating torque exerted by the golfer during the swing operation. Is done.

The fitting device according to the fourth aspect is the fitting device according to any one of the first to third aspects, and the first swing index includes the head speed at the time of the swing operation.

The fitting device according to the fifth viewpoint is a fitting device according to any one of the first to fourth viewpoints, and the determination unit determines the optimum swingability index as the first swing index is larger or smaller. Decide on a large value.

The fitting device according to the sixth viewpoint is a fitting device according to any one of the first to fifth viewpoints, and has the size of the first swing index and the optimum swingability index for each type of the test club. A storage unit for storing correspondence data that determines the correspondence with the size is further provided. The determination unit determines the optimum swingability index by referring to the correspondence data in the storage unit according to the type of the test club.

The fitting device according to the seventh aspect is a fitting device according to any one of the first to sixth aspects, and the swingability index includes the moment of inertia around the shoulder of the golfer and the moment of inertia of the golf club. , And at least one of the weights of the golf club.

The fitting device according to the eighth aspect is a fitting device according to any one of the first to seventh aspects, and the measured value includes at least one of acceleration, angular velocity and geomagnetism at the grip end of the test club. Is done.

The fitting device according to the ninth viewpoint is a fitting device according to any one of the first to eighth viewpoints, and the determination unit is at a plurality of positions of the shaft suitable for the golfer as the optimum rigidity index. Determine the stiffness distribution.

The fitting device according to the tenth viewpoint is the fitting device according to the ninth viewpoint, and the calculation unit calculates the first to third feature amounts as the second swing index. The determination unit is located in the first to third positions arranged in this order from the butt end to the tip end of the shaft as the optimum rigidity index according to the respective sizes of the first to third feature quantities. The first to third rigidity values indicating the rigidity of the shaft suitable for the golfer are determined.

The fitting device according to the eleventh viewpoint is a fitting device according to the ninth viewpoint or the tenth viewpoint, and the determination unit according to a predetermined formula expressing the relationship between the second swing index and the optimum rigidity index. , The optimum stiffness index is determined.

The fitting method according to the twelfth aspect is a fitting method for selecting a golf club suitable for a golfer, and includes the following steps (1) to (4).
(1) A step of measuring the swing motion of the test club by the golfer with a measuring device.
(2) A step of calculating a first swing index and a second swing index related to the swing operation based on the measured value.
(3) The optimum swingability index, which is a swingability index of a golf club suitable for the golfer, is determined according to the size of the first swing index, and the optimum swingability index is determined according to the size of the second swing index. , A step of determining an optimum rigidity index indicating the rigidity of a shaft suitable for the golfer.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum swingability index and the optimum rigidity index.

The fitting program according to the thirteenth aspect is a fitting program for selecting a golf club suitable for a golfer, and causes a computer to execute the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index and a second swing index related to the swing operation based on the measured value.
(3) The optimum swingability index, which is a swingability index of a golf club suitable for the golfer, is determined according to the size of the first swing index, and the optimum swingability index is determined according to the size of the second swing index. , A step of determining an optimum rigidity index indicating the rigidity of a shaft suitable for the golfer.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum swingability index and the optimum rigidity index.

The fitting device according to the fourteenth aspect is a fitting device for selecting a golf club suitable for a golfer, and includes an acquisition unit that acquires a measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and the above-mentioned. A calculation unit that calculates a first swing index and a second swing index related to the swing motion based on the measured value, and a specific part of the golf club suitable for the golfer according to the size of the first swing index. In addition to determining the optimum characteristic index representing the characteristics of the golfer, a determination unit for determining the optimum rigidity index indicating the rigidity of the shaft suitable for the golfer according to the size of the second swing index, the optimum characteristic index, and the said It includes a golf club that matches the optimum rigidity index and a selection unit that selects at least one of the shafts.

The fitting device according to the fifteenth aspect is the fitting device according to the fourteenth aspect, and the determination unit determines, in addition to the size of the first swing index, according to the type of head to be included in the golf club. The optimum characteristic index is determined. The specific portion is a portion other than the head.

The fitting device according to the 16th viewpoint is a fitting device according to the 14th viewpoint or the 15th viewpoint, and the specific portion is a shaft or a grip.

The fitting device according to the 17th viewpoint is a fitting device according to any one of the 14th to 16th viewpoints, and the determination unit is suitable for the golfer according to the size of the first swing index. The optimum swingability index, which is an index of golf club swingability, is determined, and the optimum characteristic index is determined according to the size of the optimum swingability index.

The fitting device according to the 18th viewpoint is a fitting device according to the 17th viewpoint, and the determination unit uses the first swing index as an explanatory variable and the optimum swingability index as an objective variable in a predetermined regression equation. By substituting the first swing index calculated by the calculation unit, the optimum swingability index is calculated.

The fitting device according to the 19th viewpoint is a fitting device according to any one of the 14th to 16th viewpoints, and the determination unit uses the first swing index as an explanatory variable and the optimum characteristic index as an objective variable. The optimum characteristic index is calculated by substituting the swing index calculated by the calculation unit into the predetermined regression equation.

The fitting device according to the twentieth viewpoint is a fitting device according to any one of the fourteenth to nineteenth viewpoints, and the optimum characteristic index is the weight of the shaft of the golf club suitable for the golfer. Is.

The fitting device according to the 21st aspect is a fitting device for selecting a golf club suitable for a golfer, and is an input reception for receiving input of information from a user for determining the type of head to be included in the golf club. A golf club suitable for the golfer, depending on the size of the first swing index and the type of the head specified by the user. It includes a determination unit that determines the optimum shaft weight, which is the weight of the club shaft.

The fitting device according to the 22nd viewpoint is a fitting device according to the 21st viewpoint, and the determination unit determines the swingability index of the golf club suitable for the golfer according to the size of the first swing index. The optimum swingability index is determined, and the optimum shaft weight is determined according to the size of the optimum swingability index and the type of the head specified by the user.

The fitting device according to the 23rd aspect is a fitting device for selecting a golf club suitable for a golfer, and includes an acquisition unit, a calculation unit, a determination unit, and a selection unit. The acquisition unit acquires a measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device. The calculation unit calculates a first swing index related to the swing operation based on the measured value. The determination unit determines which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. When the first swing index calculated based on the measured value exists near the boundary of the plurality of regions after the optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golf club is determined. , Correct the optimal club index. The selection unit selects at least one of a golf club and a shaft that matches the optimum club index.

The fitting device according to the twelfth aspect is a fitting device for selecting a golf club suitable for a golfer, and includes an acquisition unit, a calculation unit, a determination unit, and a selection unit. The acquisition unit acquires a measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device. The calculation unit calculates a first swing index related to the swing operation based on the measured value. The determination unit determines an optimum club index that represents the characteristics of the entire golf club or a specific part suitable for the golfer, depending on the size of the first swing index. The selection unit selects at least one of a golf club and a shaft that matches the optimum club index. The first swing index includes an index representing the swing motion on the swing plane, and also includes an index representing at least one of the rotation movement and the cock movement that do not appear on the swing plane.

The fitting method according to the 25th aspect is a fitting method for selecting a golf club suitable for a golfer, and includes the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index and a second swing index related to the swing operation based on the measured value.
(3) According to the size of the first swing index, an optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer is determined, and according to the size of the second swing index. , A step of determining an optimum rigidity index indicating the rigidity of a shaft suitable for the golfer.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum characteristic index and the optimum rigidity index.

The fitting program according to the 26th viewpoint is a fitting program for selecting a golf club suitable for a golfer, and causes a computer to execute the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index and a second swing index related to the swing operation based on the measured value.
(3) According to the size of the first swing index, an optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer is determined, and according to the size of the second swing index. , A step of determining an optimum rigidity index indicating the rigidity of a shaft suitable for the golfer.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum characteristic index and the optimum rigidity index.

The fitting method according to the 27th aspect is a fitting method for selecting a golf club suitable for a golfer, and includes the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index related to the swing operation based on the measured value.
(3) Suitable for the golfer depending on which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. After determining the optimum club index representing the characteristics of the entire golf club or a specific part, if the first swing index calculated based on the measured value exists near the boundary of the plurality of regions, the said Steps to modify the optimal club index.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum club index.

The fitting program according to the 28th viewpoint is a fitting program for selecting a golf club suitable for a golfer, and causes a computer to execute the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index related to the swing operation based on the measured value.
(3) Suitable for the golfer depending on which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. After determining the optimum club index representing the characteristics of the entire golf club or a specific part, if the first swing index calculated based on the measured value exists near the boundary of the plurality of regions, the said Steps to modify the optimal club index.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum club index.

The fitting method according to the 29th aspect is a fitting method for selecting a golf club suitable for a golfer, and includes the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index related to the swing operation based on the measured value. The first swing index includes an index representing the swing motion on the swing plane, and also includes an index representing at least one of the rotation movement and the cock movement that do not appear on the swing plane.
(3) A step of determining an optimum club index that represents the characteristics of the entire golf club or a specific part suitable for the golfer according to the size of the first swing index.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum club index.

The fitting program according to the thirtieth aspect is a fitting program for selecting a golf club suitable for a golfer, and causes a computer to execute the following steps (1) to (4).
(1) A step of acquiring a measured value measured by a measuring device for a swing motion of a test club by the golfer.
(2) A step of calculating a first swing index related to the swing operation based on the measured value. The first swing index includes an index representing the swing motion on the swing plane, and also includes an index representing at least one of the rotation movement and the cock movement that do not appear on the swing plane.
(3) A step of determining an optimum club index that represents the characteristics of the entire golf club or a specific part suitable for the golfer according to the size of the first swing index.
(4) A step of selecting at least one of a golf club and a shaft that matches the optimum club index.

According to the first aspect of the present invention, the first swing index and the second swing index are calculated based on the measured values by the test club. Then, according to the first swing index, the optimum swingability index, which is the swingability index of the golf club suitable for the golfer (for example, the swing inertia moment of the golf club, the moment of inertia around the grip end, the weight, etc.) is determined. At the same time, the optimum rigidity index indicating the rigidity of the shaft suitable for the golfer is determined according to the second swing index. Then, at least one of the golf club and the shaft that matches the optimum swingability index and the optimum rigidity index is selected. That is, at least one of the golf club and the shaft is narrowed down based on the swingability index suitable for the golfer, not the index such as the weight of my club for which it is uncertain whether or not the golf club is suitable for the golfer. Therefore, it is possible to accurately select a golf club suitable for a golfer.

According to the 14th aspect of the present invention, the first swing index and the second swing index are calculated based on the measured values by the test club. Then, the optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer (for example, the weight of the shaft) is determined according to the first swing index, and the golfer is determined according to the second swing index. The optimum rigidity index indicating the rigidity of the shaft suitable for the above is determined. Then, at least one of the golf club and the shaft that matches the optimum characteristic index and the optimum rigidity index is selected. That is, at least one of the golf club and the shaft is narrowed down based on the characteristics of a specific part of the golf club suitable for the golfer, not an index such as my club weight which is uncertain whether or not the golf club is suitable for the golfer. Therefore, it is possible to accurately select a golf club suitable for a golfer.

According to the 21st aspect of the present invention, the user receives input of information for determining the type of head to be included in the golf club, and the first swing index regarding the swing motion of the golfer is calculated. Then, in addition to the head type specified by the user, the weight of the shaft suitable for the golfer (optimum shaft weight) is determined according to the first swing index. That is, at least one of the golf club and the shaft is narrowed down based on the weight of the shaft suitable for the golfer, not the index such as the weight of the my club which is uncertain whether or not the golf club is suitable for the golfer. Therefore, it is possible to accurately select a golf club suitable for a golfer.

The figure which shows the fitting system which comprises the fitting apparatus which concerns on one Embodiment of this invention. Functional block diagram of the fitting system. The figure explaining the xyz local coordinate system with respect to the grip of a golf club. A flowchart showing the flow of the fitting process. (A) The figure which shows the address state. (B) The figure which shows the top state. (C) The figure which shows the impact state. (D) The figure which shows the finish state. The flowchart which shows the flow of the 1st conversion process. The figure explaining the swing plane. A flowchart showing the flow of the shoulder behavior derivation process. The figure which conceptually explains the double pendulum model. The flowchart which shows the flow of the 1st index calculation process. Another figure that conceptually illustrates the double pendulum model. The figure explaining the arm energy. A flowchart showing the flow of the process of determining the optimum swingability. The figure which shows the professional model area. The figure which shows the average model area. The figure explaining the International Flex Code (IFC). The figure explaining the measuring method of the flexural rigidity of a shaft. The figure explaining the bending of the shaft during a swing. The functional block diagram of the fitting system which concerns on 2nd Embodiment. The flowchart which shows the flow of the fitting process which concerns on 2nd Embodiment. A flowchart showing the flow of the optimum characteristic determination process. Various golf club of the I _S, graph plotting the relationship between the I _G. Various golf club of the I _S, graph plotting the relationship of m _2. The flowchart which shows the flow of the optimum swing ease determination process which concerns on a modification. The flowchart which shows the flow of the optimum swing ease determination process which concerns on another modification. The figure explaining the angle which becomes the 1st swing index which concerns on the modification. The flowchart which shows the flow of the optimum swing ease determination process which concerns on still another modification. The figure which shows the professional model area which concerns on the modification of FIG. 27. The figure which shows the average model area which concerns on the modification of FIG. 27. The flowchart which shows the flow of the optimum swing ease determination process which concerns on still another modification. The figure which shows the average shoulder torque-arm energy plane which concerns on the modification of FIG. The flowchart which shows the flow of the optimum swing ease determination process which concerns on still another modification. The figure which conceptually explains the shoulder behavior derivation process which concerns on a modification. Another figure conceptually explaining the shoulder behavior derivation process according to the modified example. The figure which shows the simulation result of the double pendulum model which concerns on 1st Embodiment. The figure which shows the simulation result of the double pendulum model which concerns on a modification. The figure which shows the space which shows the 1st swing index divided into the division area corresponding to the optimum shaft weight band. The figure which shows the space which shows the 1st swing index divided into the division area corresponding to the optimum shaft weight band for a specific flex. The figure which shows the space which shows the 1st swing index divided into the division area corresponding to the optimum shaft weight band for another flex. The figure which shows the space which shows the 1st swing index divided into the division area corresponding to the optimum shaft weight band for still another flex. The figure which shows the flow of boundary processing. A conceptual diagram showing the movement of twisting rotation. A conceptual diagram showing the movement of push rotation. The figure which shows the flow of exception handling. The graph which shows the flight distance by Example 1 and the comparative example. The graph which shows the left-right deviation by Example 1 and the comparative example. The graph which shows the test hit result of Example 2. A graph showing the test hit results of the reference example.

Hereinafter, a golf club fitting device, a method, and a program according to some embodiments of the present invention will be described with reference to the drawings.

<1. First Embodiment>
<1-1. Outline configuration of fitting system>
1 and 2 show the overall configuration of the fitting system 100 including the fitting device 2 according to the present embodiment. The fitting device 2 is a device for selecting a golf club 4 suitable for the golfer 7 based on measurement data obtained by measuring the swing motion of the golf club 4 by the golfer 7. In the present embodiment, the measurement of the swing motion is performed by the sensor unit 1 attached to the grip 42 of the golf club 4, and the fitting device 2 constitutes the fitting system 100 together with the sensor unit 1.

Hereinafter, the configuration of the sensor unit 1 and the fitting device 2 will be described, and then the flow of the fitting process will be described.

<1-1-1. Sensor unit configuration>
As shown in FIGS. 1 and 3, the sensor unit 1 is attached to the end of the grip 42 of the golf club 4 opposite to the head 41, and measures the behavior of the grip 42. The golf club 4 is a general golf club, and is composed of a shaft 40, a head 41 provided at one end of the shaft 40, and a grip 42 provided at the other end of the shaft 40. The shaft 40 according to this embodiment is a carbon shaft. The sensor unit 1 is compact and lightweight so as not to interfere with the swing operation. As shown in FIG. 2, the sensor unit 1 according to the present embodiment includes an acceleration sensor 11, an angular velocity sensor 12, and a geomagnetic sensor 13. Further, the sensor unit 1 is also equipped with a communication device 10 for transmitting measurement data by these sensors 11 to 13 to an external fitting device 2. In the present embodiment, the communication device 10 is wireless so as not to interfere with the swing operation, but may be connected to the fitting device 2 by wire via a cable.

The acceleration sensor 11, the angular velocity sensor 12, and the geomagnetic sensor 13 measure the grip acceleration, the grip angular velocity, and the grip geomagnetism in the xyz local coordinate system based on the grip 42, respectively. More specifically, the acceleration sensor 11 measures _{the grip accelerations a x} , a _y , and a _z in the x-axis, y-axis, and z-axis directions. The angular velocity sensor 12 measures _{the grip angular velocities ω x} , ω _y , and ω _z around the x-axis, y-axis, and z-axis. Geomagnetic sensor 13 measures the x-axis, y-axis and z-axis direction of the grip geomagnetism m _x, m _y, a m _z. These measurement data are acquired as time-series data having a predetermined sampling period Δt. The xyz local coordinate system is a 3-axis Cartesian coordinate system defined as shown in FIG. That is, the z-axis coincides with the extending direction of the shaft 40, and the direction from the head 41 to the grip 42 is the z-axis positive direction. The x-axis is oriented as close as possible to the toe-heel direction of the head 41, and the y-axis is oriented as close as possible to the normal direction of the face surface of the head 41.

In the present embodiment, the measurement data by the acceleration sensor 11, the angular velocity sensor 12, and the geomagnetic sensor 13 are transmitted to the fitting device 2 in real time via the communication device 10. However, for example, the measurement data may be stored in the storage device in the sensor unit 1, and the measurement data may be taken out from the storage device after the swing operation is completed and passed to the fitting device 2.

<1-1-2. Fitting device configuration>
The configuration of the fitting device 2 will be described with reference to FIG. The fitting device 2 is manufactured by installing the fitting program 3 according to the present embodiment stored in a computer-readable recording medium 20 such as a CD-ROM or a USB memory on a general-purpose personal computer from the recording medium 20. Will be done. The fitting program 3 is software for analyzing the swing motion based on the measurement data sent from the sensor unit 1 and outputting information that assists in selecting a golf club 4 suitable for the golfer 7. The fitting program 3 causes the fitting device 2 to execute an operation described later.

The fitting device 2 includes a display unit 21, an input unit 22, a storage unit 23, a control unit 24, and a communication unit 25. These units 21 to 25 are connected to each other via the bus line 26 and can communicate with each other. In the present embodiment, the display unit 21 is composed of a liquid crystal display or the like, and displays information described later to the user. The term "user" as used herein is a general term for golfers 7 themselves, their instructors, and other persons who require fitting results. Further, the input unit 22 can be composed of a mouse, a keyboard, a touch panel, etc., and receives an operation from the user for the fitting device 2. The communication unit 25 is a communication interface that enables communication between the fitting device 2 and the external device, and receives data from the sensor unit 1.

The storage unit 23 is composed of a non-volatile storage device such as a hard disk. In addition to storing the fitting program 3 in the storage unit 23, measurement data sent from the sensor unit 1 is stored. Further, the correspondence data 28, the head database (DB) 27, and the shaft database (DB) 29 are stored in the storage unit 23. The correspondence data 28, which will be described in detail later, is defined for each of various models (series) of the golf club 4, and is data indicating conditions for determining the optimum swingability index. Similarly, although details will be described later, the head DB 27 is a database in which information indicating specifications of a large number of heads 41 is stored in association with information for specifying the type of the head 41. The shaft DB 29 is a database in which information indicating specifications of a large number of shafts 40 is stored in association with information for specifying the type of the shaft 40. The shaft DB 29 stores, for example, data of more than 100 types of shafts 40.

The control unit 24 can be composed of a CPU, a ROM, a RAM, and the like. By reading and executing the fitting program 3 in the storage unit 23, the control unit 24 virtually acquires the acquisition unit 24A, the grip behavior derivation unit 24B, the shoulder behavior derivation unit 24C, the calculation unit 24D, the determination unit 24E, and the selection unit. It operates as 24F and display control unit 24G. Details of the operation of each part 24A to 24G will be described later.

<1-2. Fitting process>
Subsequently, the fitting process executed by the fitting system 100 will be described. As shown in FIG. 4, the fitting process according to the present embodiment is composed of the following nine steps (S1 to S9).
(S1) grip acceleration a _x in the xyz local coordinate system, a _y, a _z, grip angular velocity ω _x, ω _y, ω _z and grip geomagnetism m _x, m _y, measuring step of measuring the measurement data m _z ( S2) The first conversion of the measurement data in the xyz local coordinate system obtained in the measurement step into the grip accelerations a _X , a _Y , a _Z and the grip angular velocities ω _X , ω _Y , ω _{Z in the XYZ overall coordinate system.} Conversion step (In the first conversion step, the grip speeds v _X , v _Y , and v _Z in the XYZ global coordinate system are also derived.)
(S3) The behavior of the grip 42 in the XYZ global coordinate system (grip angular velocities ω _X , ω _Y , ω _Z and grip velocities v _X , v _Y , v _Z ) is measured in the swing plane P (described later). Second conversion step (S4) A shoulder behavior deriving step of deriving a pseudo shoulder behavior of the golfer 7 in the swing plane P based on the behavior of the grip 42 in the swing plane P (S4). S5) Based on the behavior of the grip 42 and the pseudo shoulder behavior in the swing plane P, the first swing index (in this embodiment, the arm output power P _{1_AVE} , the club input power P _{2_AVE,} and the head speed V described later). _h) based on the first index calculating step (S6) first swing index for calculating an optimal swing easiness in swing easiness index (the embodiment which is suitable for a golfer 7, a swing moment of inertia I _S) to be described later _{Second swing index (in this embodiment, first to fourth feature quantities F 1} described later) based on the measurement data of the optimum swing ease determination step (S7) for determining the index (optimal swing MI in the present embodiment). -F ₄ ) Second index calculation step (S8) Based on the second swing index, the optimum rigidity index (EI distribution described later in this embodiment) indicating the rigidity of the shaft 40 suitable for the golfer 7 is determined. Optimal Rigidity Determining Step (S9) Optimal Crab Selection Step for Selecting an Optimal Swing Ease Index and a Golf Club 4 Matching an Optimal Rigidity Index, In particular, a Shaft 40. These steps will be described in order below.

The XYZ overall coordinate system is a three-axis Cartesian coordinate system defined as shown in FIG. That is, the Z-axis is the direction from vertically downward to upward, the X-axis is the direction from the back to the belly of the golfer 7, and the Y-axis is parallel to the ground plane from the ball hitting point to the target point. The direction.

<1-2-1. Measurement process>
In the measurement step (S1), the golfer 7 swings the golf club 4 with the sensor unit 1 described above. The golf club 4 that is swung in the measurement process is one of the two test clubs. These test clubs are different types of golf clubs, one of which is a professional golf club (hereinafter referred to as a professional model club) and the other of which is a golf club suitable for average users (hereinafter referred to as a professional model club) in this embodiment. , Average model club). Further, in the present embodiment, the professional model club is heavier than the average model club. Which test club is swung in the measurement process is determined based on the golfer 7's taste and experience.

If the length of the user's my club is different from the length of the golf club based on the shaft stored in the shaft DB29 in order to improve the fitting accuracy, the total weight of the test club is used as the length of the my club. Change to a reasonable total club weight. This makes it possible to select a shaft that matches the user. For example, if the club lengths stored in the shaft DB29 are all 45 inches (= 1143 mm) and the user's My Club length A (mm) is different from 45 inches, the total weight of the test club is calculated by the following formula. The fitting is performed by changing to the one calculated by (total weight equivalent to 45 inches).
(Total weight of test club) = (A-1143) x 0.377 + (Total weight of my club)

Subsequently, as described above golf club 4 grip acceleration a _x in the swing motion, a _y, a _z, grip angular velocity ω _x, ω _y, ω _z and grip geomagnetism m _x, m _y, m _z of the measurement data Is measured by the sensor unit 1. This measurement data is transmitted to the fitting device 2 via the communication device 10 of the sensor unit 1. On the other hand, on the fitting device 2 side, the acquisition unit 24A receives this via the communication unit 25 and stores it in the storage unit 23. In this embodiment, at least time-series measurement data from the address to the impact is measured.

The swing motion of a golf club generally proceeds in the order of address, top, impact, and finish. The address means an initial state in which the head 41 of the golf club 4 is arranged near the ball as shown in FIG. 5 (A), and the top means the golf club 4 from the address as shown in FIG. 5 (B). This means the state in which the head 41 is swung up most. As shown in FIG. 5 (C), the impact means the state at the moment when the golf club 4 is swung down from the top (downswing) and the head 41 collides with the ball, and the finish is shown in FIG. 5 (D). As shown in the above, it means a state in which the golf club 4 is swung forward after the impact.

In the measurement step, it is preferable that the above golf club 4 is tried a plurality of times, preferably 5 times or more. In this case, the average value of the measurement data can be calculated and used for the subsequent calculation. Also, in order to remove abnormal values due to miss shots, measurement errors, etc., the standard deviation σ of the measurement data is calculated, and when all the measurement data are not within the average value ± k · σ (k is a constant). May display a message requesting addition or re-measurement on the display unit 21. It should be noted that the average value of the processing values (for example, arm output power P _{1_AVE} , club input power P _{2_AVE,} and head speed V _h ) calculated based on the measurement data is calculated instead of the average value of the measurement data itself. It may be. When calculating the average value of the processed values, the reliability of the data can also be checked based on the standard deviation σ.

<1-2-2. First conversion process>
Hereinafter, the first conversion step (S2) of converting the measurement data of the xyz local coordinate system into the value of the XYZ overall coordinate system will be described with reference to FIG. Specifically, first, the acquisition unit 24A has grip accelerations a _x , a _y , a _z , grip angular velocities ω _x , ω _y , ω _z and grips in the xyz local coordinate system stored in the storage unit 23. geomagnetic m _x, m _y, reads the measurement data of the time series of m _z (step S11).

Then, based on the measurement data of the time series in the xyz local coordinate system read in step S11, the grip behavior deriving unit 24B derives the impact time t _i of the top and address, t _t, the t _a (Step S12). The method of deriving these times _{t i, t t, t a} , since it is known are various, detailed description thereof is omitted here.

In the following step S13, the grip behavior deriving unit 24B calculates the attitude matrix N (t) at the time t from the address to the impact. Now, suppose that the attitude matrix is expressed by the following equation. The attitude matrix N (t) is a matrix for converting the XYZ overall coordinate system at time t into the xyz local coordinate system.

The meanings of the nine components of the attitude matrix N (t) are as follows.
Component a: Cosine of the angle between the X-axis of the global coordinate system and the x-axis of the local coordinate system Component b: Cosine of the angle between the Y-axis of the global coordinate system and the x-axis of the local coordinate system Component c: Overall Cosine component of the angle between the Z-axis of the coordinate system and the x-axis of the local coordinate system d: Cosine component of the angle between the X-axis of the global coordinate system and the y-axis of the local coordinate system e: Y of the global coordinate system Cosine component of the angle between the axis and the y-axis of the local coordinate system f: The cosine component of the angle between the Z-axis of the global coordinate system and the y-axis of the local coordinate system g: The X-axis of the global coordinate system and the local Cosine component of the angle formed by the z-axis of the coordinate system h: Cosine component of the angle formed by the Y-axis of the global coordinate system and the z-axis of the local coordinate system i: Z-axis of the global coordinate system and z of the local coordinate system Cosine of the angle formed by the axis Here, the vector (a, b, c) represents the unit vector in the x-axis direction, and the vector (d, e, f) represents the unit vector in the y-axis direction, and the vector ( g, h, i) represent a unit vector in the z-axis direction.

Further, the attitude matrix N (t) can be expressed by the following equation according to the concept of Euler angles of the ZZ system. However, φ, θ, and ψ are rotation angles around the Z-axis, Y-axis, and Z-axis, respectively.

In calculating the posture matrix N (t) to the impact from the address, first, the address of the time t _a at the posture matrix N (t _a) is calculated. Specifically, φ and θ at the time of address are calculated according to the following formula. The following equation utilizes the fact that the golf club 4 is stationary at the time of addressing, and only the gravity in the vertical direction is detected by the acceleration sensor 11. The grip accelerations a _x , a _y , and a _z in the following equation are the values at the time of addressing.

ただし、上式中のｍ_xi，ｍ_yiの値は、以下の式に従って算出される。また、以下の式中のグリップ地磁気ｍ_x，ｍ_y，ｍ_zは、アドレス時の値である。

Subsequently, ψ at the time of address is calculated according to the following formula.

However, _{the values of m xi} and my _{i in} the above formula are calculated according to the following formula. Further, the following grip geomagnetic m _x in the formula, m _y, m _z is the value at the address.

From the above, during the address phi, theta, [psi is grip acceleration a _x in the xyz local coordinate system, a _y, a _z and grip geomagnetism m _x, m _y, is calculated on the basis of the m _z. And these phi, theta, by substituting the value Expression 2 of [psi, address when the posture matrix N (t _a) is calculated.

Subsequently, the attitude matrix N (t) from the address to the impact is calculated by updating _{the attitude matrix N (t a) at the time of address every moment at sampling period Δt intervals.} Specifically, first, the attitude matrix N (t) is expressed by the following equation using _{the four variables q 1} , q ₂ , q ₃ , and q ₄ of the quaternion (q _{4 is the scalar part).}

Therefore, from equations 1 and 7, the quaternion four variables q ₁ , q ₂ , q ₃ , and q ₄ can be calculated according to the following equations.

Now, the value of a~i that defines the address at the time of the attitude matrix N (t _a) is known. Therefore, according to the above equation, first, the four variables q ₁ , q ₂ , q ₃ , and q ₄ of the quaternion at the time of addressing are calculated.

Then, the quaternion q'after a minute time elapses from the time t is expressed by the following equation using the quaternion q at the time t.

The first-order differential equation representing the time change of the four variables q ₁ , q ₂ , q ₃ , and q _{4 of the quaternion is expressed by the following equation.}

By using the equations of the equations 9 and 10, the quaternion at time t can be sequentially updated to the next quaternion at time t + Δt. Here, the quaternion from address to impact is calculated. Then, the attitude matrix N (t) from the address to the impact is calculated by sequentially substituting _{the four variables q 1} , q ₂ , q ₃ , and q ₄ of the quaternion from the address to the impact into the equation of equation 7. NS.

_{Next, in step S14, the grip behavior deriving unit 24B determines the grip acceleration a x} , a _y , a _{z in} the xyz local coordinate system from the address to the impact based on the attitude matrix N (t) from the address to the impact. And the time series data of grip angular velocities ω _x , ω _y , ω _z are converted into time series data in the XYZ global coordinate system. The converted grip accelerations a _X , a _Y , a _Z and the grip angular velocities ω _X , ω _Y , ω _Z are calculated according to the following equations.

In the following step S15, the grip behavior deriving unit 24B _{integrates the time series data of the grip accelerations a X} , a _Y , and a _{Z , so that the grip speed v X} , v _{Y in} the XYZ overall coordinate system from the address to the impact. , V _Z is derived. _{At this time, it is preferable to offset the grip speeds v X} , v _Y , v _Z from the address to the impact so as to be 0 m / s at the top.

<1-2-3. Second conversion process>
Hereinafter, the second conversion step (S3) of converting the behavior of the grip 42 in the XYZ global coordinate system calculated in the first conversion step into the behavior of the grip 42 in the swing plane P will be described. In this embodiment, the swing plane P includes the origin of the XYZ global coordinate system and is defined as a plane parallel to the Y axis and the shaft 40 at impact (see FIG. 7). In the second conversion step, the grip behavior deriving unit 24B projects the grip speeds v _X , v _Y , v _Z and the grip angular velocities ω _X , ω _Y , ω _Z in the XYZ global coordinate system into the swing plane P. _Calculate v _pX , v pY, v _pZ and grip angular velocity ω _pX , ω _pY , ω _pZ .

Specifically, based on the z-axis vector (g, h, i) included in the attitude matrix N (t) representing the extending direction of the shaft 40, the golfer 7 is viewed from the front in the positive direction of the X-axis (viewing the golfer 7 from the front). E) Calculate the time series data of the inclination of the shaft 40. Then, this time on the basis of the sequence data identifies the time at which the shaft 40 is parallel to the Z axis when viewed from the X-axis positive direction, which is referred to as time t _i of the impact. It should be noted that the time t _i of the impact here is not necessarily to coincide with the time t _i of the foregoing impact. Then, a time t _i of the posture matrix N (t _i) contained in the z-axis vector of the impact based (g, h, i) to calculates the inclination of the shaft 40 as viewed from the Y axis negative direction. That is, the angle α'formed by the shaft 40 and the X-axis when viewed from the negative direction of the Y-axis at the time of impact is calculated, and this is used as the swing plane angle.

Once the swing plane angle α'is obtained, the projective transformation matrix A for projecting an arbitrary point in the XYZ global coordinate system onto the swing plane P can be calculated as follows. However, α = 90 ° −α'.

Here, based on the above-mentioned projective transformation matrix A, when the grip speeds v _pX , v _pY , v _pZ and the grip angular velocities ω _pX , ω _pY , ω _{pZ after the projective transformation from the address to the impact are performed according to the following equation.} Series data is calculated.

The grip velocity (v _pY , v _pZ ) obtained by the above calculation represents the grip velocity (vector) in _{the swing plane P, and the grip angular velocity ω pX} is the axis perpendicular to the swing plane P. It represents the angular velocity around. Here, the grip speed (scalar) in the swing plane P from the address to the impact is calculated according to the following formula.

Further, here, the inclination of the shaft 40 at the top in the swing plane P, which is necessary for the later calculation, is also calculated. Specifically, first, the projection z axis vector included in the posture matrix N (t _t) of the top (g, h, i), and using the projective transformation matrix A, the swing plane P according to the equation do. However, the vector after projection is (g', h', i').

The vector (h', i') specified by the above equation is a vector representing the inclination of the shaft 40 at the top in the swing plane P. Therefore, by substituting the above calculation result into the following equation, the inclination β of the shaft 40 at the top in the swing plane P is calculated.

<1-2-4. Shoulder behavior derivation process>
Hereinafter, while calculating the 8, based on the behavior of the grip in the swing plane P (grip velocity V _GE and the grip angular velocity omega _pX), shoulder behavior derivation to derive the behavior of pseudo shoulders swing plane P The step (S4) will be described. In the present embodiment, the behavior of the golf club 4 is a double pendulum model in which the shoulder and grip 42 of the golfer 7 (or the wrist of the golfer who holds the golf club 4) are the nodes, and the arm of the golfer 7 and the golf club 4 are linked. It is analyzed based on. However, the shoulder behavior is not directly measured, but is derived as a pseudo shoulder behavior based on the measured grip behavior. In the following, unless otherwise specified, the term "shoulder" shall also mean such a pseudo-shoulder. The same applies to the pseudo "arm" defined as extending linearly between the pseudo shoulder and the grip 42 (wrist).

In identifying the behavior of the shoulder from the behavior of the grip, the double pendulum model according to the present embodiment is premised on the following (1) to (5). FIG. 9 is a diagram conceptually explaining the following preconditions.
(1) On the swing plane P, the grip 42 (wrist) makes a circular motion around the shoulder. (2) On the swing plane P, the distance (radius) R between the shoulder and the grip 42 is constant.
(3) The shoulder does not move (but rotates) during the swing operation.
(4) On the swing plane P, the angle between the arm at the top and the golf club 4 is 90 °.
(5) The arm at the time of impact faces downward on the Z axis when viewed from the positive direction on the X axis.

Under the above premise, the shoulder behavior deriving unit 24C calculates the moving distance D of the grip 42 from the top to the impact in the swing plane P (step S21). The movement distance D is derived by integrating _{the grip velocity V GE} from the top to the impact.

Subsequently, the shoulder behavior deriving unit 24C calculates the rotation angle γ of the arm from the top to the impact in the swing plane P (step S22). The rotation angle γ is calculated based on the inclination β of the shaft 40 at the top calculated in the second conversion step. Next, the shoulder behavior deriving unit 24C calculates the radius R = D / γ (step S23).

_{Then, the shoulder behavior deriving unit 24C calculates the angular velocity (arm angular velocity) ω 1} around the shoulder from the top to the impact in the swing plane P as the shoulder behavior according to the following equation (step S24). That is, the angular velocity ω ₁ of the arm is a value that reflects the measured grip velocity VG _E.
ω ₁ = V _GE / R

<1-2-5. First index calculation process>
Hereinafter, the first index calculation step (S5) for calculating the first swing index based on the behavior of the grip 42 and the behavior of the shoulder will be described with reference to FIG. The first swing index is a feature amount that characterizes the swing motion by the golfer 7 for determining the optimum swing ease index. _{In this embodiment, the arm output power P 1_AVE} , which will be described later, is used as the first swing index.
, Club input power P _{2_AVE} and head speed V _h are calculated.

Specifically, first, in step S31, the shoulder behavior deriving unit 24C _{integrates the angular velocity ω 1} of the arm from the top to the impact, and calculates _{the rotation angle θ 1 of the arm from the top to the impact.} At this time, it is preferable to use the trapezoidal integral. The rotation angle θ ₁ is defined as shown in FIG. 11, and the paper surface of FIG. 11 is equal to the swing plane P. Below, the analysis proceeds based on the new XY coordinate system in the swing plane P shown in FIG. The X-axis of the new XY coordinate system in the swing plane P is equal to the Y-axis of the XYZ overall coordinate system described above, and the Y-axis of the new XY coordinate system is the Z-axis of the XYZ overall coordinate system in the swing plane P. It is the axis projected on.

In addition, the shoulder behavior deriving unit 24C is, by differentiating the angular velocity ω ₁ of the arm from the top to the impact, to calculate the angular acceleration ω ₁ 'from the top to the impact. Then, the shoulder behavior deriving unit 24C, the position of the center of gravity of the arm from the top to the impact (X _1, Y _1), calculate the velocity (V _X1, V _Y1) and acceleration (A _X1, A _Y1). These values are calculated by substituting the above calculation results into the following equation.

However, r is the distance from the shoulder to the center of gravity of the arm. In this embodiment, the center of gravity of the arm is assumed to be in the center of the arm. Therefore, R = 2r.

Next, in step S32, the grip behavior deriving unit 24B performs the same calculation as in step S31 around the grip 42. That is, the angular velocity ω _{pX from the top to the impact = the angular velocity ω 2} of the golf club 4 around the grip 42 _{is integrated, and the rotation angle θ 2} of the golf club 4 (shaft 40) around the grip 42 from the top to the impact is calculated. do. Also at this time, it is preferable to use the trapezoidal integral, and the rotation angle θ ₂ is defined as shown in FIG.

Subsequently, the grip behavior deriving unit 24B is, by differentiating the angular velocity ω ₂ of the golf club 4 from the top to the impact, to calculate the angular acceleration ω ₂ 'from the top to the impact. Then, the grip behavior deriving portion 24B, the position of the center of gravity of the golf club 4 from the top to the impact (X _2, Y _2), calculate the velocity (V _X2, V _Y2) and acceleration (A _X2, A _Y2) .. These values are calculated by substituting the above calculation results into the following equation.

However, L is the distance from the grip 42 to the center of gravity of the golf club 4. The value of L is a specification of the golf club 4, and is assumed to be predetermined.

_{Next, in step S33, the calculation unit 24D calculates the binding force R 1} = (R _X 1, _{RY 1} ) generated on the shoulder from the top to the impact by substituting the above calculation result into the following formula. _{At the same time, the binding force R 2} = (R _X2 , _{RY 2} ) generated in the grip 42 from the top to the impact is calculated. The following equation is based on the balance of translational forces. However, m ₁ is the mass of the arm, and in the present embodiment, the mass m ₁ of the arm is appropriately predetermined. For example, before starting the analysis, the weight of the golfer 7 is input, and the input weight is multiplied by a predetermined coefficient to automatically calculate the mass of the arm. m ₂ is the mass of the golf club 4, and g is the gravitational acceleration. Further, m ₂ is a specification of the golf club 4, and is assumed to be predetermined.

ただし、Ｉ₁は、腕の重心周りの慣性モーメントであり、Ｉ₂は、ゴルフクラブ４の重心周りの慣性モーメントである。本実施形態では、腕の重心周りの慣性モーメントＩ₁は、腕の重心が腕の中心にあるとの仮定の下、Ｉ₁＝ｍ₁ｒ²／３として算出される。また、I₂は、ゴルフクラブ４のスペックであり、予め定められているものとする。 In the following step S34, the calculation unit 24D calculates the torque T _{g1 around the center of gravity of the arm from the top to the impact and the torque T g2} around the center of gravity of the golf club 4 by substituting the above calculation result into the following formula. do.

However, I ₁ is the moment of inertia around the center of gravity of the arm, and I ₂ is the moment of inertia around the center of gravity of the golf club 4. In this embodiment, the moment of inertia I ₁ of the arm of the center of gravity around the center of gravity of the arm under the assumption that the center of the arm is calculated as ^{_{I 1 = m 1 r 2/}} 3. Further, I ₂ is a specification of the golf club 4 and shall be predetermined.

In step S35, calculation unit 24D, based on the calculation results described above, to calculate the work rate of the arm from the top to the impact (power) E ₁ '. Specifically, E ₁ 'is the velocity vector of the shoulder and v _s, the velocity vector of the grip 42 as v _g, expressed according to the following equation. Further, v _s and v _g can be calculated by first-order differentiating the shoulder position vector d _s and the grip 42 position vector d _g = d _s + (2X ₁ , 2Y _{1), respectively.}

Further, in the present embodiment, since the shoulder does not move, v _s = (0,0), and the arm work rate of E ₁ 'is calculated according to the following equation. Calculator 24D, by substituting the calculation results described above in the following equation to calculate the arm work rate E ₁ 'from the top to the impact.

By the way, in the golf swing, in order to accelerate the tip (head 41) of the golf club 4 most, it is required to first accelerate the arm sufficiently and then stop the movement of the arm to give the golf club 4 momentum. It is thought that it will be possible. The degree of acceleration of the arm here can be replaced with a physical index called the power output by the arm (arm output power) P ₁ , and the momentum given to the golf club 4 is the power input to the golf club 4 (club). Input power) P ₂ can be replaced with a physical index. The arm output power P ₁ corresponds to the second and third terms on the right side of the number 22 representing the power of the arm E _1'. Further, the club input power P ₂ corresponds to the first term portion on the right side in the equation of Equation 22. That is, the arm output power P ₁ and the club input power P ₂ can be expressed as follows. In step S35, the calculation unit 24D calculates _{the arm output power P 1} and the club input power P ₂ from the top to the impact in addition to the arm power _{E 1} '.

Incidentally, work rate E ₂ exerted by the golf club 4 during a swing operation 'can be expressed by the following equation. That is, club input power P ₂ = R ₂ v _g ^T becomes the bridge, energy is transferred from the arm to the golf club 4.

In subsequent step S36, calculation unit 24D identifies the time t _c which arms work rate in the subsequent top E ₁ 'turns from positive to negative, the workload of the arm from time t _t of the top to the time t _c E ₁ Is calculated. Workload E ₁ of the arm by integrating the arm work rate E ₁ 'in the period from time t _t ~t _c, is calculated (see FIG. 12). Since the work amount E ₁ can be considered as an index showing the work amount (energy) exerted by the arm between the times t t and _{t c, in this sense, it is called the arm energy during the swing motion.} Can be done. Further, calculator 24D calculates the time _t t ~t average work rate _{E AVE = E 1 / t c} -t t exerted by the arms during _c. The average power E _AVE is the arm energy that is exerted or consumed on average per unit time during the swing motion.

Further, calculator 24D includes arm output power P ₁ from the time t _t of top integrates the arm output power P ₁ in the interval up to time t _m taking the maximum value, the integrated value D ₁ integration interval (t _{c -By} dividing by t _m ), the average arm output power P 1_AVE during the swing motion is calculated. The integrated value D ₁ is the amount of work performed by the golfer's arm during the swing motion, and can be an index indicating the arm output power. Similarly, the calculation unit 24D, the club input power P ₂ from the time t _t of top integrates the club input power P ₂ in the interval until time t _n to the maximum value, the integrated value D ₂ integration interval (t _By dividing by c ―t _n ), the average club input power P _{2_AVE} during the swing motion is calculated. The integrated value D ₂ is the amount of work performed on the golf club 4 during the swing operation, and can be an index indicating the club input power. The integration interval shown here is an example, and for example, _{an interval from time t t to t c} can be set as appropriate.

In subsequent step S37, calculation unit 24D calculates a cock release timing t _r during the swing operation. The present inventors, through experimentation, head speed V _h at impact, cook release timing t _r during the swing operation, and have found that there is a correlation between the arm energy E ₁ or the average work rate E _AVE .. Therefore, here, the cock release timing _tr is calculated in _{order to calculate the head speed V h} at the time of impact. In the present embodiment, the cock release timing t _r is the time t _t ~t section arms work rate at up to _c E ₁ 'is the time when the maximum is identified as a cook release timing t _r (see FIG. 12) ..

In the following step S38, the calculation unit 24D calculates _{the head speed V h} at the time of impact based on _{the cock release timing tr} and the arm energy E _AVE . Specifically, the head velocity V _h at the time of impact is calculated according to the following formula. Note that k ₁ , k ₂ , and k ₃ are constants obtained by multiple regression analysis from the results of a large number of experiments performed in advance, and are values stored in advance in the storage unit 23. From the above, the index calculation process is completed.
V _h = k ₁ · E _AVE + k ₂ · _tr + k ₃

By the above processing, the arm output power P _{1_AVE} , the club input power P _{2_AVE,} and the head speed V _h are calculated as the first swing index for determining the optimum swingability index.

<1-2-6. Optimal swing ease determination process>
Hereinafter, the flow of the optimum swingability determination step (S6) will be described with reference to FIG. The optimum swing easiness index according to the present embodiment, an optimal swing MI, optimum swing MI refers to a swing moment of inertia I _S of a golf club 4 suitable for a golfer.

Further, the swing moment of inertia I _S, a moment of inertia about the shoulder during the swing, for example, can be defined according to the following formula.
_IS = I ₂ + m ₂ (R + L) ² + I ₁ + m ₁ (R / 2) ²
For each golfer 7, the weight of the arm is the same even if the golf club 4 is changed. Accordingly, in the present embodiment, for simplicity, the swing moment of inertia I _S omits revolution of the moment of inertia of the arm, is calculated according to the following equation.
_IS = I ₂ + m ₂ (R + L) ²
Furthermore, in the present embodiment, as arm length R = 60cm (constant), the swing moment of inertia I _S is calculated. However, the value of the arm length R calculated in step S23 can be substituted for R in the above equation. By the way, m _2, I _2, L is a parameter that determines the I _S is the specifications of the golf club 4. Therefore, the swing moment of inertia in this embodiment is also a specification of the golf club 4.

First, in step S40, the determination unit 24E determines the type of test club that has been tested in the measurement process. If the professional model club has been hit, the process proceeds to step S41, and if the average model club has been hit, the process proceeds to step S51. Which test club has been tried is determined based on the information input by the user via the input unit 22.

The type of the test club is determined in step S40 because the region in which the first swing index is distributed differs depending on the type of the test club. Specifically, the present inventors have 21 golfers (hereinafter, professional model users) who normally use a professional model golf club and golfers who normally use an average model golf club (hereinafter, average). When 22 model users) were made to test-hit the professional model club and the average model club, respectively, and the first swing index was calculated, the results shown in FIGS. 14 and 15 were obtained. The first swing index calculated in this experiment was arm output power P _{1_AVE} , club input power P _{2_AVE,} and head speed V _h , and specific values were calculated according to the same steps as described above. Then, from the results shown in FIGS. 14 and 15, the present inventors have found that the space showing the first swing index is roughly divided into a pro model region and an average model region. The professional model area is an area in which the first swing index during the swing operation by the professional model user is distributed, and the average model area is an area in which the first swing index during the swing operation by the average model user is distributed. be. As can be seen by comparing FIGS. 14 and 15, the pro model region is a region in which the arm output power P _{1_AVE} , the club input power P _{2_AVE,} and the head speed V _h are all larger than the average model region. However, these values may differ depending on the swing conditions such as the type of test club. In this experiment, as a professional model club, a driver of SRIXON (registered trademark) Z-525 (shaft is Miyazaki Kosuma Blue6 S-Flex, golf club weight is 314 g, balance is D3) manufactured by Dunlop Sports Limited As an average model club, a driver of XXIO (registered trademark) 8 (shaft is MP-800 R-Flex, golf club weight is 272 g, balance is D3) manufactured by Dunlop Sports Limited was used. ..

Subsequently, steps S41 and subsequent steps S42 to S44 will be described. Steps S41 to S44 are steps for determining the range of the optimum swing MI (hereinafter, the optimum swing MI band) according to the magnitudes _{of the arm output power P 1_AVE} and the club input power P _{2_AVE.} Here, the _{larger the values of P 1_AVE} and P _{2_AVE} , the larger the optimum swing MI band is set stepwise.

_{Specifically, in step S41, the point represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step in the determination unit 24E is a straight line L1 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is on the upper side of the above, that is, whether or not it belongs to the region A1 of FIG. 14 (hereinafter, professional condition 1). Then, when the professional condition 1 is satisfied, it is determined that 5623 kg · cm ² or more is the optimum swing MI band. On the other hand, if the professional condition 1 is not satisfied in step S41, the process proceeds to step S42. In step S42, in the determination unit 24E, the _{points represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step are above the straight line L2 and on the straight line L1 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is below, that is, whether or not it belongs to the region A2 of FIG. 14 (hereinafter, professional condition 2). Then, when the professional condition 2 is satisfied, it is determined that 5540 to 5623 kg · cm ² is the optimum swing MI band. On the other hand, if the professional condition 2 is not satisfied in step S42, the process proceeds to step S43. In step S43, in the determination unit 24E, the _{points represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step are above the straight line L3 and on the straight line L2 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is below, that is, whether or not it belongs to the region A3 of FIG. 14 (hereinafter, professional condition 3). Then, when the professional condition 3 is satisfied, it is determined that 5480 to 5540 kg · cm ² is the optimum swing M band I. On the other hand, if the professional condition 3 is not satisfied in step S43, the process proceeds to step S44. In step S44, in the determination unit 24E, the _{points represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step are above the straight line L4 and on the straight line L3 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is below, that is, whether or not it belongs to the region A4 of FIG. 14 (hereinafter, professional condition 4). Then, when the professional condition 4 is satisfied, it is determined that 5400 to 5480 kg · cm ² is the optimum swing MI band. On the other hand, when the professional condition 4 is not satisfied in step S44, that is, the _{point represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step is a straight line in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. When it is below L4 and belongs to the region A5 in FIG. 14, it is determined that 5400 kg · cm ² or less is the optimum swing MI band.

On the other hand, step S51 and subsequent steps S52 and S53 are steps for determining the optimum swing MI band according to the magnitudes _{of the arm output power P 1_AVE} , the club input power P _{2_AVE,} and the head speed V _h. Here, the _{larger the values of P 1_AVE} , P _{2_AVE,} and V _h , the larger the optimum swing MI band is set stepwise.

_{Specifically, in step S51, the point represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step in step S51 is a straight line L5 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is on the upper side of the above, that is, whether or not it belongs to the region B1 of FIG. 15 (hereinafter, average condition 1). Then, when the average condition 1 is satisfied, it is determined that 5300 kg · cm ² or more is the optimum swing MI band. On the other hand, if the average condition 1 is not satisfied in step S51, the process proceeds to step S52. In step S52, in the determination unit 24E, the _{points represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step are above the straight line L6 and on the straight line L5 in the _{P 1_AVE} −P _{2_AVE} plane shown in FIG. It is determined whether or not it is below, that is, whether or not it belongs to the region B2 of FIG. 15 (hereinafter, average condition 2). Then, when the average condition 2 is satisfied, it is determined that 5200 to 5300 kg · cm ² is the optimum swing MI band. On the other hand, if the average condition 2 is not satisfied in step S52, the process proceeds to step S53. In step S53, the determination unit 24E determines _{whether or not the head speed V h} calculated in the first index calculation step is greater than 35.5 m / s (average condition 3). Then, when the average condition 3 is satisfied, it is determined that 5200 to 5300 kg · cm ² is the optimum swing MI band. On the other hand, when the average condition 3 is not satisfied in step S53, that is, the _{point represented by (P 1_AVE} , P _{2_AVE} ) calculated in the first index calculation step is lower than the straight line L6 shown in FIG. When it belongs to the region B3 of FIG. 14, it is determined that 5200 kg · cm ² or less is the optimum swing MI band.

The above steps S41 to S44 and steps S51 to S53 are based on the following findings. That is, in the above experiment described with reference to FIGS. 14 and 15, the head speed V _h and the optimum swing MI that maximizes the flight distance were also calculated. The head speed V _h was calculated according to the same process as described above. On the other hand, the optimal swing MI, to swing the golf club of the various swing moment of inertia I _s to the golfer, to identify the swing moment of inertia I _s of the golf club which gives the maximum distance, which was the best swing MI. More specifically, the professional model user, swing moment of inertia I _s swing the five types of golf club of ^{5650kg · cm 2, 5610kg · cm} 2, 5520kg · cm 2, 5440kg · cm 2, 5360kg · cm 2 I let you. On the other hand, the average model user, swing moment of inertia I _s was shown swing the three types of golf club of ^{5330kg · cm 2, 5230kg · cm} 2, 5130kg · cm 2. 14 and 15 also show the head speed V _h [m / s] and the optimum swing MI values obtained in this experiment.

As shown in FIGS. 14 and 15, it can be seen _{from the above experiment that the optimum swing MI increases as both the arm output power P 1_AVE} and the club input power P _{2_AVE increase.} As a result, the present inventors _divided the arm output power P 1_AVE-club input power P _{2_AVE} space (pro model region) into regions as shown in FIG. 14, and thereby, the regions A1 to correspond to the optimum swing MI band. It was discovered that A5 can be defined. _{Further, by dividing} the arm output power P 1_AVE − club input power P _{2_AVE} − head velocity V _h space (average model region) into regions as shown in FIG. 15, the regions B1 to B3 corresponding to the optimum swing MI band can be obtained. I found that it could be defined. However, for the sake of simplicity, in FIG. 15, the _{axis representing the head speed V h} is omitted, and the arm output power P _{1_AVE} − club input power P _{2_AVE} plane is shown. That is, in steps S41 to S44 described above, the optimum swing MI band is determined according to which region in the _{P 1_AVE} −P _{2_AVE} space the points indicating _{the arm output power P 1_AVE} and the club input power P _{2_AVE are plotted.} It is a step to do. On the other hand, in steps S51 to _S53 , the points indicating the arm output power P 1_AVE, the club input power P _{2_AVE,} and the head speed V _h are plotted in which region in the _{P 1_AVE} −P _{2_AVE} −V _{h space.} This is a step to determine the optimum swing MI band. The threshold values used for the determinations in steps S41 to S44 and steps S51 to S53, in other words, the information for identifying the boundary lines L1 to L6 of the divided regions A1 to A5 and B1 to B3 shown in FIGS. It is organized for each model of the test club and stored in the storage unit 23 as correspondence data 28. That is, the correspondence data 28 is data that determines the correspondence between _{the magnitudes of P 1_AVE} , P _{2_AVE,} and V _h and the optimum swing MI band. The boundary lines L1 to L4 are substantially parallel to each other, and the boundary lines L5 and L6 are also substantially parallel to each other. Further, the boundary lines L1 to L6 are all straight lines having a negative slope in the _{P 1_AVE} −P _{2_AVE plane.} In steps S41 to S44 and steps S51 to S53, the correspondence data 28 in the storage unit 23 is referred to, and the above determination is performed. Although the correspondence data 28 is shown as data different from the fitting program 3 in FIG. 2, it may be incorporated in the program 3.

By the way, in the average model region, _{when the points showing the arm output power P 1_AVE} and the club input power P _{2_AVE} belong to the region B3, the _{optimum swing differs depending on whether the head speed V h} is larger than 35.5 m / s. It is designed to be distributed to the MI band. This is because, as shown in the experimental results shown in FIG. 15, the optimum swing MI has a different value depending on whether _{V h> 35.5 m / s or not in these regions.}

By the way, as described above, FIGS. 14 and 15 plot the results of an experiment in which 21 professional model users and 22 average model users were actually made to test-hit the test club. As for the professional model user, the optimum swing MI band in which the optimum swing MI is determined in the above-mentioned optimum swing ease determination step in 20 people excluding the one marked with F out of the 21 data. The result belongs to. That is, it was confirmed that the fitting was completed with a correct answer rate of 95% or more. Regarding the average model user, the optimum swing MI band in which the optimum swing MI is determined in the above-mentioned optimum swing ease determination process in 21 people excluding the one marked with F out of the 22 data. The result belongs to. That is, it was confirmed that the fitting was completed with a correct answer rate of 95% or more.

<1-2-7. Second index calculation process>
Hereinafter, the second index calculation step (S7) for calculating the second swing index based on the measurement data obtained in the measurement step will be described. The second swing index is a feature amount that characterizes the swing motion by the golfer 7 for determining the optimum rigidity index. In the present embodiment, the first to fourth feature amounts F _{1 to} F _4, which will be described later, are calculated as the second swing index.

In order to understand the first to fourth feature quantities F _{1 to F 4} , it is important to first understand the optimum stiffness index. The optimum rigidity index is an index indicating the rigidity of the shaft 40 suitable for the golfer 7. In the present embodiment, the rigidity of the shaft 40 is the distribution of flexural rigidity at a plurality of positions of the shaft 40 (hereinafter, EI distribution). ). The EI distribution according to the present embodiment is quantitatively expressed using numerical values, and more specifically, it is calculated using the International Flex Code (IFC). Therefore, first, this IFC will be described. IFC is a known index showing the characteristics of a shaft widely proposed by the applicant, and has already been described in detail in various documents including Patent Document 1. Therefore, it is not always necessary to explain it again here, but it will be explained here for reference.

As shown in FIG. 16, the IFC expresses the flexural rigidity of the shaft 40 at four positions H1 to H4 along the extending direction of the shaft 40 by a single digit value of 0 to 9, and these four values are represented by a single digit value of the shaft 40. It is a code arranged along the extending direction. More specifically, four measurement points H1 to H4 are defined at substantially constant intervals in this order from the butt end to the tip end of the shaft 40. For example, a point 36 inches from the tip end of the shaft 40 may be set as a measurement point H1, a point 26 inches as a measurement point H2, a point 16 inches as a measurement point H3, and a point 6 inches as a measurement point H4. can. Then, the values of flexural rigidity (hereinafter referred to as EI values) J _{1 to} J ₄ at each of these four measurement points H1 to H4 are measured.

^{The EI value (Nm 2} ) at each measurement point H (H1 to H4) of the shaft 40 can be measured by various methods. For example, a 2020 type measuring machine (maximum load 500 kgf) manufactured by Intesco is used. Can be measured as shown in FIG. In this measuring method, while supporting the shaft 40 from below at the two support points 111 and 112, the amount of deflection when a load F is applied to the measurement point H from above is measured. The distance (span) between the support point 111 and the support point 112 can be, for example, 200 mm, and the measurement point H can be an intermediate point between the support point 111 and the support point 112. More specifically, with the supports 114 and 115 supporting the support points 111 and 112 fixed, the indenter 113 is moved downward at a constant speed (for example, 5 mm / min) at the measurement point H. Then, when the load F reaches 20 kgf, the movement of the indenter 113 is terminated, the amount of deflection (mm) of the shaft 40 at this moment is measured, and this amount of deflection is converted into an ^{EI value (Nm 2).}

Next, the EI values J _{1 to} J _{4 at the above four measurement points H 1 to H 4} are converted into _{rank values K 1 to} K 4 in 10 stages, respectively. Specifically, the rank values K _{1 to} K ₄ can be calculated from the _{EI values J 1 to} J ₄ according to the following conversion tables (Tables 1 to 4) for the measurement points H 1 to H 4, respectively (Table). Among 1 to 4, the rank value after conversion is shown in the IFC column). _{Then, the four rank values K 1 to} K ₄ assigned to the measurement points H 1 to H 4 in this way have the value corresponding to the butt side to the left and the value corresponding to the chip side to the right. Arrange them so that they come together. The 4-digit code thus obtained is IFC. In IFC, the larger the value of each digit, the higher the rigidity at the corresponding position.

In the second index calculation step, the calculation unit 24D calculates the first to fourth feature amounts F _{1 to} F ₄ . In the present embodiment, the first to fourth feature quantities F _{1 to} F ₄ are the optimum EI values J _{S1 to} J _S4 , which are the EI values J _{1 to} J _4, which are suitable for the golfer 7, and the ranks suitable for the golfer 7. is an index for determining an optimum rank value K _S1 ~K _S4 is a value K ₁ ~K _4. Therefore, in this embodiment, the first to fourth feature amount F ₁ to F _4, feature amount having a correlation with optimum EI value J _S1 through J _S4 are each selected. Further, in the present embodiment, the following indexes are used as the first to _{fourth feature quantities F 1 to F 4} , but as the second swing index, any other index can be used as long as a correlation with the optimum rigidity index is recognized. Features can be used.

The first feature amount F _{1 is the slope of the angular velocity ω y in} the cock direction near the top, and can be expressed by, for example, the sum of _{the angular velocity ω y} 50 ms before the top and the angular velocity ω _y 50 ms after the top.

The second feature amount F ₂ from the top, the angular velocity omega _y is the average value of the angular velocity omega _y up to the point of maximum. For the second feature amount F _{2 , the time point at which the angular velocity ω y} is maximized from the top to the impact is first obtained, and the cumulative value of the angular velocity ω _y from the top to this point is calculated by the time from the top to this point. Calculated by dividing.

The third feature amount F ₃ is the average value of the _{angular velocity ω y} from the time when the angular velocity ω _y becomes maximum to the impact. Third feature amount F ₃ is calculated by the angular velocity omega _y is the cumulative value of the angular velocity omega _y to the impact from the time of maximum, the angular velocity omega _y is divided by the time until the impact from the time of maximum.

The fourth feature amount F ₄ is an average value of the angular velocity omega _y from top to the impact, the cumulative value of the angular velocity omega _y from top to the impact, is calculated by dividing a time from the top to the impact.

By the way, during the swing operation, the shaft 40 of the golf club 4 is bent due to its inertia because the head 41 having a relatively large weight is present at the tip of the golf club. This bending does not occur at the same location on the shaft 40 during the entire swing process, but is transmitted from the hand side to the tip side of the shaft 40 from the top to the impact as shown in FIG. In other words, as the swing progresses from the top to the impact, the bending position of the shaft 40 moves from the hand side to the tip side of the shaft 40.

More specifically, when the takeback is performed from the address and the top is reached (the time indicated by (1) in FIG. 18), bending occurs near the hand of the shaft 40. Then, when turning back and reaching the initial stage of the downswing (the time point shown by (2) in FIG. 18), the bending moves slightly toward the tip end side of the shaft 40. Further, at the time when the arm of the golfer 7 becomes horizontal (the time indicated by (3) in FIG. 18), the bending moves toward the tip side of the center of the shaft 40. Then, immediately before the impact (at the time point shown by (4) in FIG. 18), the bending moves to the vicinity of the tip of the shaft 40.

Therefore, the first to fourth feature quantities F _{1 to} F ₄ can be calculated in the first to fourth sections between the vicinity of the top and the vicinity of the impact during the swing operation, respectively. Further, the first to third sections here are sections along the passage of time in this order, and are sections that partially overlap or do not overlap with each other.

<1-2-8. Optimal rigidity determination process>
Next, the flow of the optimum rigidity determination step (S8) will be described. In this step, determination portion 24E is predetermined represents the correlation between the second swing index (first to fourth feature amount F ₁ to F ₄₎ optimum rigidity index (optimum EI value J _S1 through J _S4) The optimum stiffness index (optimal EI values J _{S1 to} J _S4 ) is determined according to the approximate expression. The approximate expression according to the present embodiment is a linear approximate expression and is expressed as follows.
J _S1 = a ₁ · F ₁ + b ₁
J _S2 = a ₂ · F ₂ + b ₂
J _S3 = a ₃ · F ₃ + b ₃
J _S4 = a ₄ · F ₄ + b ₄

The determination unit 24E calculates the optimum EI values J _{S1 to} J _S4 by substituting the first to _{fourth feature quantities F 1 to} F 4 calculated in the second index calculation step into such an approximate expression. _{Further, the determination unit 24E converts the optimum EI values J S1 to} J _{S 4} into the optimum rank values K _{S1 to} K _S 4, respectively, according to the conversion table in Tables 1 to 4 described above.

In the above equation, a1 to a4 and b1 to b4 are constants obtained by regression analysis from a large number of experimental results performed in advance, and are values stored in advance in the storage unit 23. The experiment referred to here can be performed as follows, for example, as in Patent Document 1. That is, first, a large number of golfers are asked to swing a plurality of golf clubs, and the flight distance at that time, the direction of the hit ball (left-right deviation), and the ease of swinging by a sensory test are quantified. Then, a golf club suitable for each golfer is determined from the numerical value, and the EI value of the golf club is set as the optimum EI value of the golfer. Further, the first to fourth feature quantities F _{1 to} F ₄ of each golfer are calculated by the same method as described above. Then, after such an experiment, a1 to a4 and b1 to b4 are calculated by regression analysis of the data of the _first to _{fourth feature amounts F1 to F4 and the optimum EI value for a large number of golfers.}

Further, the values of a1 to a4 and b1 to b4 can be changed according to the conditions in order to obtain a more reliable approximate expression. For example, an approximate expression can be prepared according to the head speed V _h. As an example, the above experimental data is classified according to the head speed band (for example, 45 m / s or more, 41 to 45 m / s, 41 m / s or less), and the above approximate expression is applied only to the data belonging to the same classification. It can be prepared and a1 to a4 and b1 to b4 can be determined. Then, in the optimum rigidity determination step, it is determined _{which head speed band the golfer 7's head speed V h} belongs to, and the optimum rigidity index is calculated by using the approximate expression corresponding to the head speed band.

<1-2-9. Optimal club selection process>
When the optimum swingability index (optimum swing MI band) and the optimum rigidity index (optimum EI values J _{S1 to} J _S4 , optimum rank values K _{S1 to} K _S4 ) are determined by the above steps S1 to S8, the selection unit The 24th floor executes the optimum club selection step (S9). In this step, a shaft 40 suitable for the golfer 7 (hereinafter referred to as a recommended shaft) is specified from a large number of shafts registered in the shaft DB 29. Further, as a result of fitting, a golf club 4 suitable for the golfer 7 (hereinafter referred to as a recommended golf club) is also specified.

In the present embodiment, first, the selection unit 24F determines the type of head 41 (hereinafter, recommended head) to be used for the recommended golf club. The recommended head type can be determined by a fitting process not described in the present specification, or by asking the user a question via the display unit 21 and the input unit 22 to select the desired head 41. You can also do it. Then, the selection unit 24F reads the information indicating the specifications of the recommended head from the head DB 27, and also reads the information indicating the specifications of all the shafts 40 registered in the shaft DB 29. The information indicating the specifications of the head 41 registered in the head DB 27 includes the manufacturer, model number, weight, and the like. On the other hand, the information indicating the specifications of the shaft 40 registered in the shaft DB 29 includes the manufacturer, model number, EI values J _{1 to} J ₄ and rank values K _{1 to} K 4 (IFC) at the _{four positions H 1 to H 4.} , Weight, flex, torque, tone, length, center of gravity position, etc. of the shaft 40 are included. Selecting unit 24F is a golf club 4 from the information, calculates the swing moment of inertia I _S of a golf club 4 when the combination of the recommended head and the shaft 40, its value is to belong to the optimal swing MI band (Hereinafter, first narrowing down golf club) and the shaft 40 included therein (hereinafter, first narrowing down shaft) are specified. In addition, there are usually a large number of first narrowing down golf clubs and shafts.

Subsequently, the selection unit 24F calculates, for each first narrowing shaft, the degree of agreement between the _{rank values K 1 to} K _{4 of the shaft and the optimum rank values K S 1 to} K _{S 4} determined in the optimum rigidity determination step. , As a recommended shaft, identify a shaft with a high degree of agreement. The degree of coincidence can be calculated, for example, according to the following equation of Equation 25, and the smaller the value, the higher the degree of coincidence.

As the recommended shaft, only one shaft may be specified, or a plurality of shafts may be specified. Further, as the recommended shaft, a predetermined number of shafts having a relatively high degree of matching may be specified among the first narrowing shafts, or all shafts having a certain degree of matching or more may be specified. The display control unit 24G refers to the shaft DB 29 and displays information (including an IFC value) indicating the specifications of the recommended shaft on the display unit 21 together with information indicating the type of the recommended shaft. Further, the display control unit 24G displays the golfer's optimum swing MI band and the optimum rank values K _{S1 to} K _{S 4} on the display unit 21. Further, the display control unit 24G displays information indicating that the recommended golf club is a golf club in which the recommended shaft and the recommended head are combined on the display unit 21. As a result, the user can know the types of the golf club 4 and the shaft 40 suitable for the golfer 7, and also know the IFC value, the optimum swing MI band, and the optimum rank values K _{S1 to} K _S4 of the golf club. Can be done.

<2. Second Embodiment>
FIG. 19 shows the overall configuration of the fitting system 200 according to the second embodiment. The fitting system 200 has many points in common with the fitting system 100 according to the first embodiment. Therefore, for the sake of simplicity, the differences between the first embodiment and the second embodiment will be mainly described below, and the same configurations as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

FIG. 20 is a flowchart showing the flow of the fitting process according to the second embodiment. As is clear from a comparison between FIGS. 4 and 20, the difference between the analysis processes of the first embodiment and the second embodiment is mainly the optimum characteristic determination step (S6) instead of the optimum swingability determination step (S6). S206) is executed, the optimum rigidity determination step (S208) is executed instead of the optimum rigidity determination step (S8), and the optimum club selection process (S209) is executed instead of the optimum club selection process (S9). At the point. More specifically, in the optimum swing ease determination step (S6) according to the first embodiment, the optimum swing MI band is finally determined, but in the optimum characteristic determination step (S206) according to the second embodiment. Finally, the weight (optimal shaft weight) of the shaft 40 of the golf club 4 suitable for the golfer is determined. That is, in the first embodiment, the optimum swingability index is determined, but in the second embodiment, the optimum characteristic index representing the characteristics of a specific portion of the golf club 4 suitable for the golfer is determined. Further, in the optimum rigidity determination step (S8) according to the first embodiment, a 4-digit IFC code (optimal rank values K _{S1 to} K _S4 ) was finally determined as the optimum rigidity index, but the second embodiment. In the optimum rigidity determination step (S208) according to the embodiment, the flex (optimal flex) of the shaft 40 of the golf club 4 suitable for the golfer is finally determined as the optimum rigidity index. Further, in the optimum club selection step (S9) according to the first embodiment, the shaft 40 capable of achieving the optimum swing ease index (optimum swing MI band) for the entire golf club 4 after fixing the head 41. After narrowing down, the shaft 40 that matches the optimum rigidity index (optimal rank values K _{S1 to} K _S4 ) as much as possible was determined, but in the optimum club selection step (S209) according to the second embodiment, the head 41 is fixed. Then, the shaft 40 that matches the optimum characteristic index (optimum shaft weight) and the optimum rigidity index (optimum flex) as much as possible is determined.

As shown in FIG. 19, the fitting system 200 includes a fitting device 202 instead of the fitting device 2. The fitting device 202 has the same hardware configuration as the fitting device 2, but the fitting program 203 is installed in the fitting device 202 instead of the fitting program 3. Therefore, the control unit 24 virtually operates as the acquisition unit 24A, the grip behavior derivation unit 24B, the shoulder behavior derivation unit 24C, and the calculation unit 24D by reading and executing the fitting program 203 in the storage unit 23. It can operate as a determination unit 224E, a selection unit 224F, and a display control unit 224G. The determination unit 224E is a virtual unit that executes the optimum characteristic determination step (S206) and the optimum rigidity determination step (S208), which are differences from the first embodiment, and the selection unit 224F and the display control unit 225G are the first. It is a virtual unit that executes the optimum club selection step (S209), which is a difference from the embodiment. Further, the correspondence data 228 is stored in the storage unit 23 of the fitting device 202 instead of the correspondence data 28 so that the optimum characteristic determination step (S206) can be executed. Correspondence data 228 is data indicating conditions for determining the optimum shaft weight.

Also in the second embodiment, as in the first embodiment, the measurement step (S1), the first conversion step (S2), the second conversion step (S3), the shoulder behavior derivation step (S4), and the first index calculation step (S5). ) Are sequentially executed, and subsequently, the optimum characteristic determination step (S206) is executed. After that, the second index calculation step (S7) is executed, and then the optimum rigidity determination step (S208) and the optimum club selection step (S209) are sequentially executed. Hereinafter, the optimum characteristic determination step (S206), the optimum rigidity determination step (S208), and the optimum club selection step (S209), which are differences from the first embodiment, will be described in order.

<2-1. Optimal characteristic determination process>
In the optimum characteristic determination step (S206), the determination unit 224E determines the range of the optimum shaft weight (hereinafter, the range of the optimum shaft weight) according to the magnitude of _{the first swing index (arm output power P 1_AVE} , club input power P _{2_AVE,} and head speed V _h). , Optimal shaft weight range). At this time, the _{larger the values of P 1_AVE} , P _{2_AVE,} and V _h , the larger the optimum shaft weight band is set stepwise. Specifically, the optimum characteristic determination step proceeds according to the flowchart shown in FIG.

In step S101, the determination unit 224E determines the type of the user's favorite head 41 (hereinafter, preference head) based on the user's input. The preference head is a head 41 that should be included in the recommended golf club. The type of preference head can be determined by having the user directly specify the type of preference head via the display unit 21 and the input unit 22, or the user is asked various questions and the answers are accepted. , It can also be performed by narrowing down the preference heads according to a predetermined algorithm from the answer.

In the following step S102, the determination unit 224E determines the optimum swing MI, which is an index of optimum _{swingability, according to the magnitudes of the arm output power P 1_AVE} , the club input power P _{2_AVE,} and the head speed V _h. The optimum swing MI can be calculated according to the flowchart shown in FIG. 13 as in the first embodiment, but in the present embodiment, it is calculated according to the following multiple regression equation.
(Optimal swing MI) = e ₁・ P _{1_AVE} ＋ e ₂・ P _{2_AVE} ＋ e ₃・ V _h ＋ e ₄

The above multiple regression equation is a multiple regression equation in which the arm output power P _{1_AVE} , the club input power P _{2_AVE,} and the head velocity V _h are the explanatory variables, and the optimum swing MI is the objective variable. The coefficients e _{1 to e 4 are calculated by acquiring a large number of data sets of variables P 1_AVE} , P _{2_AVE,} V _h and optimum swing MI in advance by experiments and performing multiple regression analysis based on these data sets. It is stored in the storage unit 23 as the correspondence data 228. That is, the correspondence data 228 includes data that determines the correspondence between _{the magnitudes of P 1_AVE} , P ₂ v_ _AVE, and V _h and the optimum swing MI. The multiple regression equation can be prepared for each test club model. In this case, the accuracy of the analysis can be improved as in the first embodiment. Further, in FIG. 19, the correspondence data 228 is shown as data different from the fitting program 203, but may be incorporated in the program 203.

In the following step S103, the determination unit 224E determines the optimum shaft weight band according to the size of the optimum swing MI and the type of the preference head. Specifically, the optimum swing MI is converted into the optimum shaft weight band according to Tables 5 and 6 below. Table 5 shows the data for the head A, and Table 6 shows the data for the head B, which is different from the head A.

That is, when the preference head is the head A, the determination unit 224E collates the optimum swing MI with Table 5 and determines the optimum shaft weight band. On the other hand, when the preference head is the head B, the optimum swing MI is collated with Table 6 to determine the optimum shaft weight band. In the present embodiment, it is assumed that either the head A or the head B is selected as the preference head in step S101.

The data in Tables 5 and 6 are data that determine the correspondence between the optimum swing MI and the optimum shaft weight band, and are included in the correspondence data 228. That is, it can be said that the correspondence data 228 is data that determines the correspondence between the first swing index (P _{1_AVE} , P _{2_AVE} and V _h ) and the optimum characteristic index (optimum shaft weight band). Correspondence data 228 that determines the correspondence between the optimum swing MI and the optimum shaft weight band can be prepared for each type of the head 41. In the present embodiment, two heads (head A and head A and two heads having different weights) of the same model have different weights. It is prepared for each head B). However, as the correspondence data 228 that determines the correspondence between the optimum swing MI and the optimum shaft weight band, data that does not depend on the type of the head 41 can be prepared.

Incidentally, the swing moment of inertia I _S of a golf club 4, is the sum of the swing moment of inertia of the head 41, and the swing moment of inertia of the shaft 40, the swing moment of inertia of the other portions (the grip 42, ferrules, etc.) .. Therefore, when a head having a small (or large) swing moment of inertia is selected as the preference head, a recommended shaft having a large (or small) swing moment of inertia is selected as the recommended shaft to be included in the recommended golf club 4. It is appropriate to be done. In this regard, when the correspondence data 228 for determining the optimum shaft weight band is prepared for each type of the head 41 as in the present embodiment, the shaft 40 is selected according to the preference head. now, it is possible to optimize the swing moment of inertia I _S of the entire golf club 4. As described above, in the present embodiment, following the first embodiment, after determining the type of the head 41, the optimum shaft weight band that can achieve the optimum swingability index for the entire golf club 4 is determined. ..

In addition, the present inventors attached shafts of various weights to SRIXON (registered trademark) Z-745 manufactured by Dunlop Sports Limited, and had 37 testers test-hit these golf clubs. Then, for each tester, the weight of the shaft that maximizes the flight distance was determined, and the optimum shaft weight was determined by experiment. In addition, the optimum shaft weight band was derived for each of the 37 testers by the same method as in the optimum characteristic determination step described above. Then, when these results were compared, it was found that the optimum shaft weight by the experiment belonged to the optimum shaft weight band determined in the optimum swingability determination step in 33 out of 37 persons. That is, it was confirmed that the fitting was completed with a correct answer rate of about 90%.

<2-2. Optimal rigidity determination process>
Next, the flow of the optimum rigidity determination step (S208) will be described. In this step, the determination unit 224E determines the optimum rigidity index (optimal flex) according to the size of the second swing index (first to fourth feature amounts F _{1 to} F _4).

Specifically, first, the determination unit 224E determines the optimum EI values J _{S1 to} J _S4 and the optimum rank values K _{S1 to} K _S4 based on the first to _{fourth feature quantities F 1 to} F 4. The method for determining these values J _{S1 to} J _S4 and K _{S1 to} K _S4 can be the same as in the first embodiment.

Subsequently, the determination unit 224E determines the optimum flex based on _{the optimum rank values K S1 to} K _S4. Flex is an index for evaluating the hardness (flexural rigidity) of the entire shaft 40. _{Therefore, if the optimum rank values K S1 to} K _S4 representing the bending rigidity suitable for the golfer 7 at a plurality of positions of the shaft 40 are known, the optimum flex can be calculated based on these values. For example, the optimum rank value at a specific position may be the optimum flex, or the average value of the optimum rank values at a plurality of positions may be the optimum flex.

In other embodiments, the optimum flex can be calculated directly from the optimum EI values J _{S1 to} J _{S4 instead of the optimum rank values K S1 to} K _{S4 , and these values J S1 to} J _S4 , K _S1 It can also be calculated without being based on ~ K _S4. In the latter case, an appropriate feature amount capable of specifying the optimum flex may be calculated in the second swing index determination step.

<2-3. Optimal club selection process>
When the optimum characteristic index (optimum shaft weight band) and the optimum rigidity index (optimum flex) are determined by the above steps, the selection unit 224F executes the optimum club selection step (S209). In this step, a recommended shaft is specified from a large number of shafts registered in the shaft DB 29. Recommended golf clubs are also identified.

In the present embodiment, first, the selection unit 224F refers to the information indicating the specifications of the shaft 40 registered in the shaft DB 29, and has the same flex as the optimum flex determined in the optimum rigidity determination step. Hereinafter, the first narrowing shaft) will be specified. There are usually a large number of first narrowing shafts. Subsequently, the selection unit 224F identifies a shaft 40 belonging to the optimum shaft weight band determined in the optimum characteristic determination step from the first narrowing shaft, and selects it as a recommended shaft. At this time, if the shaft 40 belonging to the optimum shaft weight band does not exist in the first narrowing shaft, the shaft 40 closest to the optimum shaft weight band among the first narrowing shafts is selected as the recommended shaft. Only one recommended shaft may be specified, or a plurality of recommended shafts may be specified. Further, the selection unit 224F selects a golf club 4 having a recommended shaft and a preference head as a recommended golf club. In the present embodiment, the recommended shaft is determined by giving priority to the optimum flex over the optimum shaft weight band, but conversely, the recommended shaft may be determined by giving priority to the optimum shaft weight band over the optimum flex. ..

The display control unit 224G refers to the shaft DB29 and displays information indicating the specifications of the recommended shaft (including IFC, flex, torque, tone, and weight values) on the display unit 21 together with information indicating the type of the recommended shaft. Display it. Further, the display control unit 224G displays the golfer's optimum swing MI band and the optimum rank values K _{S1 to} K _{S 4} on the display unit 21. Further, the display control unit 224G displays information indicating that the recommended golf club is a golf club in which the recommended shaft and the preference head are combined on the display unit 21. This allows the user to know the details of the recommended golf club and the recommended shaft.

<3. Modification example>
Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the following changes can be made. In addition, the gist of the following modified examples can be combined as appropriate.

<3-1>
In the above embodiment, the sensor unit 1 having three sensors, an acceleration sensor, an angular velocity sensor, and a geomagnetic sensor, is used as the measuring device for measuring the swing motion of the golfer 7, but the measuring device may have another configuration. .. For example, the geomagnetic sensor can be omitted. In this case, it is possible to convert the measurement data from the xyz local coordinate system to the XYZ global coordinate system by a statistical method. Since such a method is a known technique (see Japanese Patent Application Laid-Open No. 2013-56074 if necessary), detailed description thereof will be omitted here. Alternatively, a three-dimensional measuring camera can be used as the measuring device. Since a method of measuring the behavior of a golfer, a golf club, or a golf ball with a three-dimensional measuring camera is also known, detailed description thereof will be omitted here. When a three-dimensional measurement camera is used, the conversion step of the measurement data from the xyz local coordinate system to the XYZ overall coordinate system can be omitted, and the grip behavior in the XYZ overall coordinate system is directly measured. can do.

<3-2>
In the above embodiment, it is exemplified that the optimum swing MI is calculated as the optimum swing ease index. However, the optimum swingability index may be calculated for various other indexes representing the swingability of the golf club 4. For example, the weight of the golf club 4 is m ₂ (strictly speaking, if the mass is m ₂ , the weight is m ₂ g, but for the sake of simplicity, both are _{expressed as m 2} ), around the grip end. The moment of inertia I _G and the moment of inertia I ₂ around the center of gravity are also indexes representing the ease of swinging the golf club 4, and the optimum swingability index may be calculated for these indexes. Further, a plurality of optimum swingability indexes may be calculated, and fitting may be performed based on all of these optimum swingability indexes. For example, the optimum swing MI, the moment of inertia I _G around the grip end suitable for the golfer (hereinafter, the optimum grip end MI), the moment of inertia I ₂ around the center of gravity suitable for the golfer (hereinafter, the optimum center of gravity MI), and suitable for the golfer. All of the weight m ₂ of the golf club 4 (hereinafter referred to as the optimum club weight) may be calculated, and the shaft 40 of the golf club 4 satisfying these four conditions may be searched from the shaft DB 29. Further, the optimum characteristic index that meets these four conditions may be determined.

Note that the moment of inertia I _G around the grip end, for example, is calculated according to the following equation. M _2, I _2, L is a parameter which determines the I _G are the specifications of the golf club 4, I _G also becomes specifications of the golf club 4.
_IG = I ₂ + m ₂ L ²

_{Further, the weight m 2} of the golf club 4, the moment of inertia I _G around the grip end, and the moment of inertia I ₂ around the center of gravity are substantially proportional to the swing moment of inertia I _S. For example, FIG. 22, I _S of various golf club is a graph plotting the relationship between I _G, Figure 23 is a variety of golf club I _S, graph plotting the relationship m _2. Thus, in the optimal swing easiness determining step according to the embodiment, the optimum swing MI optimum grip end MI, be converted to the optimum centroid MI or optimal club weight, the optimum swing easiness of I _G, I _2, m ₂ Can be determined. For example, FIGS. 24 and 25 are modifications of the flowchart of FIG. 13, FIG. 25 is a flowchart for determining the optimum club weight, and FIG. 24 is a flowchart for determining the optimum grip end MI. Is.

<3-3>
In the above embodiment, the arm output power P _{1_AVE} , the club input power P _{2_AVE,} and the head speed V _h are used in combination as the first swing index for determining the optimum swingability index. However, the present invention is not limited to this example, and for example, _{only P 1_AVE} or P _{2_AVE} may be used as the swing index, or (P _{1_AVE} , V _h ), (P _{2_AVE} , V _h ), (P _{1_AVE} , P _{2_AVE} ). You may use a combination of two indicators such as.

Further, as described in the modified example 3-2, various indexes can be set as the optimum swingability index, not limited to the optimum swing MI, but there is a certain relationship with the optimum swingability index ( Any index can be used as the first swing index as long as the correlation) is recognized. _{For example, the arm energies E AVE} and E ₁ exerted by the golfer during the swing motion have a correlation with the optimum swing ease index and can be used as the first swing index. Further, the following total shoulder torque T _ti and average shoulder torque T _AVE also have a correlation with the optimum swingability index and can be used as the first swing index. T _ti and T _AVE are indexes representing the torque around the shoulder exerted by the golfer during the swing operation.

The total shoulder torque T _ti and the average shoulder torque T _AVE can be calculated as follows. _{First, the torque T 1} around the shoulder and the torque T ₂ around the grip 42 from the top to the impact are calculated according to the following formulas.

The total shoulder torque T _{ti is a value T ti obtained} by integrating the above-mentioned torque T ₁ around the shoulder in the section from the top to the impact. T _ti is the total amount of torque exerted around the shoulder of the golfer 7 from the top to the impact. On the other hand, the average shoulder torque T _AVE is the total shoulder torque T _ti a torque average shoulder around in a swing operation divided by the time from the top to the _{impact, T AVE = T ti / (} t i -t t ) Is calculated according to the formula. In calculating the total shoulder torque T _ti , only the positive torque T ₁ may be integrated.

The following indicators can also be used as the first swing index. For the following indexes other than (7) to (9), the larger the value, the larger the optimum swingability index tends to be, and for the indexes (7) to (9), the smaller the value, the more optimal. The swingability index tends to be large.
(1) The angle θ3 between the shaft 40 and the Z-axis of the overall coordinate system (below the grip) at the top time (see FIG. 26).
(2) angular velocity omega ₂ of the average values during the swing operation (3) the maximum value of the angular velocity omega ₂ between the top to the impact (4) the average value of the grip velocity V _GE from the top to the impact (5) from the top Grip speed to impact V _GE maximum value (6) Movement distance of grip 42 from top to impact D
(7) cock release timing t _r say the difference (in this case between the time of cock release timing t _r and the impact is, Hayamari the release speed of the cock angle θ4 the arm and the shaft 40 is made, the arm of the energy of the shaft 40 energy It can be defined as the timing when it begins to change to.)
(8) cock angle θ4 to cook release timing t arm and the shaft 40 at _r is made (see Figure 26)
(9) Downswing time, that is, the time from the top to the impact (10) The integrated value _{of the torque T 2 from the time of the top to the time when the torque T 2} around the grip 42 reverses positive and negative.

<3-3-1>
Below, with reference to FIGS. 27 to 29, the arm energy E _AVE , the average shoulder torque T _AVE, and the head speed V _h are calculated as the first swing index, and correspond to these indexes E _AVE , T _AVE , and V _h . The process of determining the optimum swingability when the range of the optimum club weight (hereinafter referred to as the optimum weight band) is calculated will be specifically described.

First, in step S140, the determination unit 24E determines the type of test club that has been tested in the measurement process. If the professional model club has been hit, the process proceeds to step S141, and if the average model club has been hit, the process proceeds to step S151. Which test club has been tried is determined based on the information input by the user via the input unit 22.

Subsequent steps S141 and subsequent steps S142 to S145 are steps for determining the optimum weight band according to the magnitudes _{of the average shoulder torque T AVE} , the arm energy E _AVE, and the head speed V _h. Here, the _{larger the values of T AVE} , E _AVE, and V _h , the larger the optimum weight band is set stepwise.

Specifically, in step S141, the determination unit 24E has a head speed V _h of 45 m / s or more, an average shoulder torque T _AVE of 85 N · m or more, and an arm energy E _AVE of 350 N · m / m /. It is determined whether or not it is s or more (hereinafter, professional condition 1). Then, when the professional condition 1 is satisfied, it is determined that 320 g or more is the optimum weight range. On the other hand, if the professional condition 1 is not satisfied in step S141, the process proceeds to step S142. In step S142, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 75 N ・ m or more and the arm energy E _AVE is 250 N ・ m / s or more (hereinafter, professional condition 2). .. Then, when the professional condition 2 is satisfied, it is determined that 310 g to 320 g is the optimum weight range. On the other hand, if the professional condition 2 is not satisfied in step S142, the process proceeds to step S143. In step S143, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 70 N ・ m or more and the arm energy E _AVE is 175 N ・ m / s or more (hereinafter, professional condition 3). .. Then, when the professional condition 3 is satisfied, it is determined that 305 g to 315 g is the optimum weight range. On the other hand, if the professional condition 3 is not satisfied in step S143, the process proceeds to step S144. In step S144, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 55 N ・ m or more and the arm energy E _AVE is 120 N ・ m / s or more (hereinafter, professional condition 4). .. Then, when the professional condition 4 is satisfied, it is determined that 300 g to 310 g is the optimum weight range. On the other hand, if the professional condition 4 is not satisfied in step S144, the process proceeds to step S145. In step S145, the determination unit 24E determines _{whether or not the head speed V h} is greater than 38 m / s (hereinafter, professional condition 5). Then, when the professional condition 5 is satisfied, it is determined that 290 g to 300 g is the optimum weight range. On the other hand, if the professional condition 5 is not satisfied in step S145, it is determined that the average model club is more appropriate than the professional model club. In response to this, the display control unit 24G displays a message on the display unit 21 indicating that the measurement process should be restarted using the average model club, and proceeds to step S151.

On the other hand, step S151 and subsequent steps S152 and S153 are steps for determining the optimum weight band according to the magnitudes _{of the average shoulder torque T AVE} , the arm energy E _AVE, and the head speed V _h. Here, the _{larger the values of T AVE} , E _AVE, and V _h , the larger the optimum weight band is set stepwise.

Specifically, in step S151, the determination unit 24E has a head speed V _h of 40 m / s or more, an average shoulder torque T _AVE of 65 N · m or more, and an arm energy E _AVE of 200 N · m / m /. It is determined whether or not s or more (hereinafter, average condition 1) is satisfied. Then, when the average condition 1 is satisfied, it is determined that the professional model club is more appropriate than the average model club. In response to this, the display control unit 24G displays a message on the display unit 21 indicating that the measurement process should be restarted using the professional model club, and proceeds to step S141. On the other hand, if the average condition 1 is not satisfied in step S151, the process proceeds to step S152. In step S152, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 55 N ・ m or more and the arm energy E _AVE is 150 N ・ m / s or more (hereinafter, average condition 2). .. Then, when the average condition 2 is satisfied, it is determined that 290 g to 300 g is the optimum weight range. On the other hand, if the average condition 2 is not satisfied in step S152, the process proceeds to step S153. In step S153, the determination unit 24E has a head speed V _h larger than 38 m / s, an average shoulder torque T _AVE of 48 N ・ m or more, and an arm energy E _AVE of 100 N ・ m / s or more (hereinafter, average). It is determined whether or not the condition 3) is satisfied. Then, when the average condition 3 is satisfied, it is determined that 290 g to 300 g is the optimum weight range. On the other hand, if the average condition 3 is not satisfied in step S153, it is determined that 290 g or less is the optimum weight range.

The above steps S141 to S145 and steps S151 to S153 are based on the following findings. That is, the present inventors have 10 golfers (hereinafter, professional model users) who normally use a professional model golf club and 10 golfers (hereinafter, average model users) who normally use an average model golf club. When the professional model club and the average model club were tried to hit, respectively, the results shown in FIGS. 28 and 29 were obtained. Then, from the results shown in FIGS. 28 and 29, the present inventors have discovered that the space showing the first swing index is divided into a pro model region and an average model region. In the examples of FIGS. 28 and 29, the pro model region is a region of average shoulder torque T _AVE ≧ 55 N ・ m and arm energy E _AVE ≧ 150 N ・ m / s, and the average model region is a region of average shoulder torque T. _AVE <is a region of 55N · m or arm energy _{E AVE <150N · m / s} . However, these values may differ depending on the swing conditions such as the type of test club. In this experiment, as a professional model club, a driver of SRIXON (registered trademark) Z-525 (shaft is Miyazaki KENA Blue6 S-Flex, golf club weight is 315 g, balance is D2) manufactured by Dunlop Sports Limited As an average model club, a driver of XXIO (registered trademark) 7 (shaft is MP-700 R-Flex, golf club weight is 285 g, balance is D1) manufactured by Dunlop Sports Limited was used. ..

In the above experiment described with reference to FIGS. 28 and 29, the head speed V _h and the optimum club weight for maximizing the flight distance were also calculated. The head speed V _h was calculated according to the same process as described above. On the other hand, regarding the optimum club weight, the golfer was made to swing golf clubs of various weights, the weight of the golf club giving the maximum flight distance was specified, and this was defined as the optimum club weight. More specifically, the professional model user was made to swing five types of golf clubs of 324 g, 316 g, 312 g, 308 g, and 300 g, and the average model user was made to swing 295 g, 290 g, and 285 g of golf clubs. 28 and 29 show the values of the head speed V _h and the optimum club weight obtained in this experiment.

As shown in FIGS. 28 and 29, it can be seen _{from the above experiments that the optimum club weight increases as both the arm energy E AVE} and the average shoulder torque T _{AVE increase.} As a result, the present inventors show the average shoulder torque T _AVE − arm energy E _AVE − head speed V _h space as shown in FIG. 28 for the pro model user and as shown in FIG. 29 for the average model user. It was discovered that the region indicating the optimum weight band can be defined by dividing the region. However, for the sake of simplicity, in FIGS. 28 and 29, the _{axis representing the head speed V h} is omitted, and the average shoulder torque T _AVE − arm energy E _AVE plane is shown. That is, in steps S141 to S145 and steps S51 to S53 described above, points showing _{the average shoulder torque T AVE} , arm energy E _AVE, and head speed V _h are plotted in any region in the _{T AVE-} E _AVE- V _{h space.} It is a step to determine the optimum weight range according to the torque. _{The threshold values of T AVE} , E _AVE, and V _h used for the determination in steps S141 to S145 and steps S151 to S153, in other words, the values indicating the boundaries of the divided regions shown in FIGS. 28 and 29 are the test clubs. It is organized for each model and stored in the storage unit 23 as correspondence data 28. That is, the correspondence data 28 according to this modification is data that determines the correspondence between the sizes of _{T AVE} , E _AVE, and V _{h and the optimum weight band.} In steps S141 to S145 and steps S151 to S153, the correspondence data 28 is referred to, and the above determination is performed.

<3-3-2>
Below, with reference to FIGS. 30 and 31, arm energy E _AVE , average shoulder torque T _AVE, and head speed V _h are calculated as the first swing index, and correspond to these indexes E _AVE , T _AVE , and V _h . The process of determining the optimum swing ease when the optimum swing MI band is calculated will be specifically described.

In the measurement process prior to this modification, one test club with a sensor unit 1 is tested by the golfer 7 instead of the two test clubs of the professional model club and the average model club. However, even in this modified example, it is possible to improve the accuracy of fitting by striking two test clubs separately.

Specifically, in step S160, whether or not the determination unit 24E has an average shoulder torque T _AVE of 77 N ・ m or more and an arm energy E _AVE of 180 N ・ m / s or more (hereinafter, condition 1). Is determined. When the condition 1 is satisfied, the determination unit 24E determines _{whether or not the head speed V h} is 45 m / s or more (hereinafter, condition 2) (step S161). Then, when the condition 2 is satisfied, it is determined that 5600 kg · cm ² or more is the optimum swing MI band, and if not, 5590 to 5630 kg · cm ² is determined to be the optimum swing MI band. On the other hand, if condition 1 is not satisfied in step S160, the process proceeds to step S162. In step S162, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 60 N · m or more and the arm energy E _AVE is 170 N · m / s or more (hereinafter, condition 3). When the condition 3 is satisfied, the determination unit 24E determines _{whether or not the head speed V h} is 45 m / s or more (hereinafter, condition 4) (step S163). Then, it is determined that if the condition 4 is satisfied, it is determined that 5590~5630kg · cm ² is optimal swing MI band, otherwise, 5510~5590kg · cm ² is optimal swing MI band. On the other hand, if the condition 3 is not satisfied in step S162, the process proceeds to step S164. In step S164, the determination unit 24E _{determines whether or not the average shoulder torque T AVE} is 50 N ・ m or more and the arm energy E _AVE is 130 N ・ m / s or more (hereinafter, condition 5). Then, when the condition 5 is satisfied, it is determined that 5460 to 5510 kg · cm ² is the optimum swing MI band, and if not, it is determined that 5480 kg · cm ² or less is the optimum swing MI band.

The above steps S160 to S164 are based on the following findings. That is, when the present inventors calculated the swing index by having 21 golfers test-hit the test club according to the present embodiment, the results shown in FIG. 31 were obtained. The swing index calculated in this experiment was also the average shoulder torque T _AVE and the arm energy E _AVE , and the specific values were calculated according to the same steps as described above. In this experiment, a driver of SRIXON (registered trademark) Z-525 (shaft is Miyazaki Kosuma Blue6 S-Flex, golf club weight is 314 g, balance is D3) manufactured by Dunlop Sports Co., Ltd. is used as a test club. Was done. In this experiment, the head speed V _h and the optimum swing MI that maximizes the flight distance were also calculated. The head speed V _h was calculated according to the same process as described above. On the other hand, regarding the optimum swing MI, a golfer is made to swing a golf club with various swing moments of inertia, and the swing moment of inertia of the golf club that gives the maximum flight distance is specified, and this is set as the optimum swing MI. More specifically, five types of golf clubs having a swing moment of inertia of 5650 kg / cm ² , 5610 kg / cm ² , 5550 kg / cm ² , 5485 kg / cm ² , and 5400 kg / cm ^{2 were swung.} FIG. 31 shows the values of the head velocity V _h and the optimum swing MI obtained in this experiment.

As shown in FIG. 31, from the above experiment, it can be seen that _{the optimum swing MI increases as both the arm energy E AVE} and the average shoulder torque T _{AVE increase.} As a result, the present inventors can define a region showing the optimum swing MI band by dividing the _{average shoulder torque T AVE} − arm energy E _AVE − head velocity V _{h space into regions as shown in FIG.} I found that there is. However, for the sake of simplicity, in FIG. 31, the _{axis representing the head speed V h} is omitted, and the average shoulder torque T _AVE − arm energy E _AVE plane is shown. That is, in steps S160 to S164 described above, the points indicating _{the average shoulder torque T AVE} , arm energy E _AVE, and head speed V _h are plotted in which region in the _{T AVE-} E _AVE- V _{h space.} , It is a step to determine the optimum swing MI band. _{The threshold values of T AVE} , E _AVE, and V _h used for the determination in steps S160 to S164, in other words, the values indicating the boundaries of the divided regions shown in FIG. 31 are stored in the storage unit 23 as correspondence data 28. It is stored. That is, the correspondence data 28 according to this modification is data that determines the correspondence between the magnitudes of _{T AVE} , E _AVE, and V _{h and the optimum swing MI band.} In steps S160 to S164, the correspondence data 28 in the storage unit 23 is referred to, and the above determination is performed.

Further, as described above, the moment of inertia I _G around the grip end is roughly proportional to the swing moment of inertia I _S. Therefore, the optimum swing MI band determined by the optimum swing easiness determining step of Fig. 30, by converting the range of moment of inertia I _G suitable for a golfer to execute the optimum swing easiness determining step based on I _G be able to. FIG. 32 is a modification of the flowchart of FIG. 30, and is a flowchart for determining the optimum grip end MI. The legend on the right side of FIG. 31 also shows a value obtained by converting the optimum swing MI into the optimum grip end MI.

<3-4>
In the first and second embodiments, the bending rigidity is evaluated as the rigidity of the shaft, but the torsional rigidity may be evaluated instead. The value of torsional rigidity (hereinafter, GJ value) can also be measured or calculated at a plurality of positions along the extending direction of the shaft 40. That is, the distribution of the torsional rigidity at a plurality of positions along the extending direction of the shaft 40 may be used as the rigidity of the shaft. In this case, the GJ value (optimal GJ value) suitable for the golfer 7 is determined as the optimum rigidity index, but the optimum GJ value is used as the second swing index for determining the optimum GJ value. Any index that correlates can be used. As such a second swing index, for example, the following index as described in Japanese Patent Application Laid-Open No. 2014-212862 can be used.

(1) The _{amount of change in the grip angular velocity ω x} per unit time from the time when the _{grip angular velocity ω y} is maximized to the impact (2) The amount of change in the grip angular velocity ω _z near the top (3) Down from the top The amount of change in the grip angular velocity ω _{z during} the swing until the grip angular velocity ω _{y becomes maximum}

Also in this modified example, an approximate expression representing the relationship between the second swing index and the optimum GJ value is calculated in advance by an experiment and stored in the storage unit 23, so that the second swing index is based on the measurement data obtained in the measurement process. The optimum GJ value can be determined from the swing index.

Further, in the first embodiment, as the optimum rigidity index, the flex, tone or torque of the shaft 40 suitable for the golfer 7 is determined instead of the rigidity distribution at a plurality of positions of the shaft 40 suitable for the golfer 7. good. Similarly, also in the second embodiment, as an optimum rigidity index, the tone, torque, or rigidity distribution at a plurality of positions of the shaft 40 suitable for the golfer 7 is determined instead of the flex of the shaft 40 suitable for the golfer 7. It may be. The torque is an index showing the torsional rigidity of the entire shaft 40.

<3-5>
In the above embodiment, an example of the shoulder behavior derivation step based on the above-mentioned (1) to (5) has been described, but the algorithm of the shoulder behavior derivation step is not limited to this, and for example, the following embodiment is used. Can be done.

In the shoulder behavior derivation step according to this modification, of the above assumptions (1) to (5), (4) and (5) are omitted, and only (1) to (3) are assumed. Specifically, the shoulder behavior deriving unit 24C approximates the trajectory of the grip 42 in the swing plane P obtained in the second conversion step to an arc (circle) (see FIG. 30). Then, the center of the arc (circle) is set to the shoulder position P _s = (P _sX , P _sY ), and the average distance from the center of the arc (circle) to the trajectory of the grip 42 is the arm length (shoulder). Distance between the grip 42 and the grip 42) R. In this case, in the second conversion step prior to the shoulder behavior derivation process, it is assumed that the trajectory of the grip 42 in the swing plane P is calculated by the grip behavior derivation unit 24B. For example, the trajectory of the _{grip 42 integrates the grip speeds (v pY} , v _{pZ ) in the swing plane P, and points A i} = (X _i , Y _i ) (i = 1, 2) on the trajectory of the grip 42. , ...) can be derived. Note that i here is a data number in chronological order.

An example of a method for deriving an approximate circle (arc) of the trajectory of the grip 42 is shown below. First, consider any three points on the orbit of the grip 42, for example, A _i , A _{i + 30} , and A _{i + 60} . At this time, since the center of the circumscribed circle of any triangle is the intersection of the vertical bisectors of the three sides of the triangle, consider a triangle having _{A i} , A _{i + 30} , and A _{i + 60 as vertices.} Then (see FIG. 31), the following equation of equation 24, and thus equation of equation 25, holds.

Then, the following equation of equation 26 is created from a plurality of equations of equation 25 for various i, and a pseudo inverse matrix is derived. _{As a result, the center P s} = (P _sX , P _sY ) of the approximate circle (arc) of the trajectory of the grip 42 can be derived.

Subsequently, the shoulder behavior deriving unit 24C is the _{distance from the center P s} = (P _sX , P _{sY) of the approximate circle (arc) to each point A i} = (X _i , Y _i ) on the orbit of the grip 42. The average value is calculated and used as the arm length R. _{Then, the shoulder behavior deriving unit 24C calculates the angular velocity around the shoulder (angular velocity of the arm) ω 1} = V _GE / R from the top to the impact in the swing plane P based on the arm length R.

FIG. 32A shows a double pendulum model from top to impact reproduced by the method according to the above embodiment, and FIG. 32B shows a double pendulum model from top to impact reproduced by the method according to this modification. Shown. As is clear from comparing these figures, in this modified example, the angle between the arm at the top and the golf club 4 is evaluated by omitting the premise (4), so that the cock angle is shallow / Can be evaluated deeply. Further, by omitting the premise (5), the angle of the arm at the time of impact is evaluated, so that the hand fast / hand rate can be evaluated.

<3-6>
In the second embodiment, after the optimum swing ease index (optimum swing MI) is determined based on the first swing index, the optimum characteristic index (optimum shaft weight) is determined based on the optimum swing MI. However, the optimum characteristic index can be directly calculated according to the size of the first swing index. Specifically, for example, a multiple regression equation with the first swing index as the explanatory variable and the optimum characteristic index as the objective variable can be calculated and stored in advance as the correspondence data 228. In this case, the optimum characteristic index can be derived by substituting the first swing index derived in the first index calculation step into the multiple regression equation. Alternatively, similarly to FIGS. 14 and 15 of the first embodiment, the P _{1_AVE} −P _{2_AVE} (−V _h ) space is divided into regions (preferably for each type of head 41) to correspond to the optimum characteristic index. An area can be defined (see FIG. 36), and the definition information can be stored in advance as correspondence data 228. In this case, the optimum characteristic index can be derived according to which region the first swing index derived in the first index calculation step belongs to.

Further, instead of the correspondence data 228 of FIG. 36, the correspondence data 228 as shown in FIGS. 37A to 37C can be used. FIG. 37A is data for determining the optimum shaft weight band when the optimum flex is “X”, and FIG. 37B is data for determining the optimum shaft weight band when the optimum flex is “S”. Yes, FIG. 37C is data for determining the optimum shaft weight band when the optimum flex is “SR”. That is, the optimum stiffness index is first determined, and the corresponding correspondence data 228 is selected. Then, based on the selected correspondence data 228, the optimum characteristic index is determined according to the size of the first swing index. According to this method, the optimum characteristic index can be calculated directly from the first swing index without determining the optimum swingability index, and the optimum rigidity index is prioritized over the optimum characteristic index to select the recommended shaft. Can be decided.

<3-7>
In the second embodiment, the optimum shaft weight is derived as the optimum characteristic index, but instead or in addition to this, an index representing the characteristics of a portion other than the shaft 40 suitable for the golfer 7, for example, a grip suitable for the golfer. The weight of 42 can also be derived. Further, as a characteristic of a specific portion of the golf club 4, a characteristic other than weight, for example, a moment of inertia can be derived.

<3-8>
The above-mentioned optimum swingability index and optimum characteristic index are indexes representing the characteristics of the entire golf club 4 or a specific part suitable for the golfer 7 (hereinafter, referred to as the optimum club index). In the first embodiment and the modified example 3-6, the optimum club index is determined according to which of the predetermined regions A1 to A5, B1 to B3, and C1 to C5 the first swing index belongs to, but the accuracy is higher. Due to the high fitting of, the following boundary processing can be performed when determining the optimal club index. The boundary processing according to this modification is performed when the first swing index calculated based on the measurement data exists near the boundary of a plurality of regions defined by dividing the space representing the first swing index. , It is a process to correct the optimum club index already mentioned.

Here, as an example, the boundary processing when combined with the modified example 3-6 will be described. The specific flow of processing is as shown in FIG. 38. The boundary processing shown in FIG. 38 is executed after the optimum shaft weight, which is an optimum club index, is determined according to the determination criteria shown in FIG. 36 (boundary lines L6 to L10 of the division regions C1 to C5).

First, in step S65, the determination unit 224E determines whether or not the determination index exists near the upper limit boundary of the determination region. _{The judgment index means P 1_AVE} and P _{2_AVE} (first swing index) calculated based on the measurement data, and the judgment area is defined in the P _{1_AVE} −P _{2_AVE} (−V _h ) space. Areas C1 to C5 to which the determination index belongs. Whether or not the judgment index exists near the upper limit boundary is determined by, for example, whether the distance between the point representing the judgment index and the upper limit boundary line of the judgment area in the _{P 1_AVE} −P _{2_AVE} (−V _{h) space is within the threshold value.} It can be determined by whether or not. When the determination index belongs to the region C2, the boundary line L7 is the upper limit boundary line.

When it is determined in step S65 that the determination index exists near the upper limit boundary of the determination region, the determination unit 224E adjusts the above-mentioned optimum shaft weight by a predetermined amount (step S66).

On the other hand, if it is determined in step S65 that the determination index does not exist near the upper limit boundary of the determination area, the process proceeds to step S67. In step S67, it is determined whether or not the determination index exists near the lower limit boundary of the determination area. Whether or not the judgment index exists near the lower limit boundary is determined by, for example, whether the distance between the point representing the judgment index and the lower limit boundary line of the judgment area in the _{P 1_AVE} −P _{2_AVE} (−V _{h) space is within the threshold value.} It can be determined by whether or not. When the determination index belongs to the region C2, the boundary line L8 is the lower limit boundary line.

When it is determined in step S67 that the determination index exists near the lower limit boundary of the determination region, the determination unit 224E adjusts so as to reduce the existing optimum shaft weight by a predetermined amount (step S68). Then, when the above steps are completed, the boundary processing is completed.

<3-9>
In the modified example 3-8, the boundary processing for determining the optimum club index more accurately has been described, but the exception handling according to this modified example is also a process for determining the optimum club index more accurately. In the above embodiment, in calculating the first swing index, the analysis was performed in the swing plane P, but the indexes shown in the above-mentioned first swing indexes P _{1_AVE} and P _{2_AVE} and the modification 3-3. Is an index representing the swing motion of the two-dimensional golfer 7 projected in the swing plane P. However, the actual swing operation is performed three-dimensionally. The exception handling according to this modification is a processing for reducing the error due to the two-dimensional analysis and improving the accuracy of the optimum club index.

In the exception handling according to this modification, as the first swing index, in addition to the above-mentioned ones, an index indicating the rotation movement that does not appear on the swing plane P and an index indicating the cock movement (hereinafter referred to as the cock index) are used. Derived. The rotation movement that does not appear on the swing plane P is an index (hereinafter referred to as a twist index) indicating a twist rotation movement (see FIG. 39A) around the shaft axis of the golf club 4 projected on the swing plane P, or a swing. It can be evaluated by an index (hereinafter, referred to as a push index) representing the rotation movement (see FIG. 39B) of the golf club 4 in the direction of jumping out from the plane P (push direction). Depending on the golfer 7, the head speed is acquired by such a rotation movement. Further, depending on the golfer 7, the head speed may be acquired by the movement of the cock in the latter half of the downswing, but the whole picture of the movement of such a cock is not necessarily projected on the swing plane P. In the exception handling described here, the optimum club index can be derived with high accuracy even for such a golfer 7.

In the following, as an example, exception handling when combined with the modified example 3-6 will be described. The specific flow of processing is as shown in FIG. The exception processing shown in FIG. 40 is executed after the optimum shaft weight, which is the optimum club index, is determined according to the determination criteria shown in FIG. 36 (boundary lines L6 to L10 of the division regions C1 to C5).

First, in step 71, the calculation unit 24D calculates the twist index based on the measurement data. The twist index can be calculated as, for example, the average value from the top to the impact of the angular velocity ω _{z around the shaft axis.} Subsequently, the determination unit 224E determines whether the head speed V _h is within the predetermined range and the twist index is equal to or higher than the predetermined value. Then, when such a condition is satisfied, the optimum shaft weight already described is adjusted to be increased by a predetermined amount (step S72). On the other hand, if such a condition is not satisfied, the process proceeds to step S73.

In step S73, the calculation unit 24D calculates the push index based on the measurement data. Subsequently, the determination unit 224E _{determines whether or not the head speed V h} is within the predetermined range, the push index is equal to or higher than the predetermined value, and the already-described optimum shaft weight is within the predetermined range. When such a condition is satisfied, the optimum shaft weight already described is adjusted to be increased by a predetermined amount (step S74). On the other hand, if such a condition is not satisfied, the process proceeds to step S75. When the push index is equal to or greater than a predetermined value, for example, the top ω _x ≧ 0 and _{the average value of ω y} from the top to the impact / the average value of ω _x from the top to the impact ≧ 1.5. It can be satisfied.

In step S75, the calculation unit 24D calculates the cock index based on the measurement data. The cock index can be calculated, for example, as a value comparing the difference _{in ω y} near the top with _{the average value of ω y from the time when ω y} becomes maximum to the impact. Subsequently, the determination unit 224E _{determines whether or not the head speed V h} is within the predetermined range, the cock index is equal to or higher than the predetermined value, and the already-described optimum shaft weight is within the predetermined range. When such a condition is satisfied, the optimum shaft weight already described is adjusted to be increased by a predetermined amount (step S76).

When the above steps are completed, exception handling ends. Both this exception processing and the boundary processing of the modified example 3-8 are processing for determining the optimum club index more accurately, and both processings can be combined. In this case, it is preferable to execute this exception handling after the boundary processing.

Hereinafter, examples of the present invention will be described. However, the present invention is not limited to the following examples.

<Example 1>
To golfers swing moment of inertia I _S is usually used a golf club 5615kg · cm ^2, while applying the method of fitting Patent Document 1 (Comparative Example), the fitting method (Example 1 of the first embodiment ) Was applied.

In the method of the comparative example, because they are not selected only golf club like within a range of My club weight ± 5g, Miyazaki Indio 7S (I S = about 5610kg · cm ²⁾ of the shaft is selected. Then, using a golf club equipped with the shaft, the golfer was made to test hit five balls, and the flight distance of the hit balls and the average value of the left-right shake were measured.

On the other hand, in the method of Example _{1, Miyazaki Indio 6S (I S} = about 5540kg · cm ²⁾ of the shaft is selected. Then, using a golf club provided with the shaft and different only in the shaft (that is, the head is the same) from the case of the comparative example, the golfer is made to test hit five balls, and the hit ball flies. The average value of the distance and the left-right movement was measured.

41A and 41B are graphs showing the average value and variation of the flight distance and the left-right blur according to the first embodiment and the comparative example. As shown in the figure, it is preferable to use the golf club selected by the method of Example 1 rather than the golf club selected by the method of the comparative example for both the flight distance and the left-right shake. rice field. Therefore, the superiority of Example 1 was confirmed.

<Example 2>
When a golf club suitable for a golfer was selected by applying the fitting method (Example 2) according to the second embodiment, the head A (weight: 200 g) and the shaft A (flex: SR, weight: 65.5 g) were selected. ) Was selected. Since the golfer usually used a golf club having the same weight as the head A, the head A was a favorite club. Further, as a golf club having the same weight as the golf club A and the same swingability index, a golf club in which a head B (weight: 202 g) and a shaft B (flex: SR, weight: 56.5 g) are combined. B was prepared. Then, when the golfer was made to try out both golf clubs A and B five times, the results shown in FIGS. 42A and 42B were obtained. FIG. 42A is a test hit result of golf club A, and FIG. 42B is a test hit result of golf club B.

As is clear from a comparison of FIGS. 42A and 42B, it is clear that swinging the golf club A including the head A having the same weight as the head normally used is superior in both left-right deviation and flight distance. I understand. That is, rather than adjusting the weight of the head to realize the optimum swingability index, it is more appropriate to adjust the weight of the shaft after adjusting the head to the golfer's taste to realize the optimum swingability index. You can see that. Therefore, it was confirmed that the fitting method according to the above embodiment selects a shaft that can achieve the optimum swingability index after fixing the head.

1 Sensor unit (measuring device)
2 Fitting device 3 Fitting program 4 Golf club 7 Golfer 24A Acquisition unit 24B Grip behavior derivation unit 24C Shoulder behavior derivation unit 24D Calculation unit 24E Decision unit 24F Selection unit 40 Shaft 41 Head 42 Grip

Claims (25)

A fitting device for selecting a golf club suitable for a golfer.
An acquisition unit that acquires the measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and
A calculation unit that calculates a first swing index and a second swing index related to the swing motion based on the measured values.
The optimum swingability index, which is a swingability index of a golf club suitable for the golfer, is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A determination unit that determines the optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
A selection unit for selecting at least one of a golf club and a shaft that matches the optimum swingability index and the optimum rigidity index is provided.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The swingability index includes at least one of the moment of inertia around the shoulder of the golfer, the moment of inertia of the golf club, and the weight of the golf club.
Fitting device. The calculation unit calculates a plurality of types of the first swing index, and calculates the first swing index.
The determination unit determines the optimum swingability index according to the size of the plurality of types of first swing indexes.
The fitting device according to claim 1. The first swing index further includes the head speed during the swing operation.
The fitting device according to claim 1 or 2. The determination unit determines the optimum swingability index to a larger value as the first swing index is larger or smaller.
The fitting device according to any one of claims 1 to 3. For each type of the test club, a storage unit for storing correspondence data that determines the correspondence between the size of the first swing index and the size of the optimum swingability index is further provided.
The determination unit determines the optimum swingability index by referring to the correspondence data in the storage unit according to the type of the test club.
The fitting device according to any one of claims 1 to 4. The measurements include at least one of acceleration, angular velocity and geomagnetism at the grip end of the test club.
The fitting device according to any one of claims 1 to 5. The determination unit determines the rigidity distribution at a plurality of positions of the shaft, which is suitable for the golfer, as the optimum rigidity index.
The fitting device according to any one of claims 1 to 6. The calculation unit calculates the first to third feature amounts as the second swing index.
The determination unit is located in the first to third positions arranged in this order from the butt end to the tip end of the shaft as the optimum rigidity index according to the respective sizes of the first to third feature quantities. The first to third rigidity values indicating the rigidity of the shaft suitable for the golfer are determined.
The fitting device according to claim 7. The determination unit determines the optimum rigidity index according to a predetermined formula representing the relationship between the second swing index and the optimum rigidity index.
The fitting device according to claim 7 or 8. It is a fitting method for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index and a second swing index related to the swing motion based on the measured value, and
The optimum swingability index, which is a swingability index of a golf club suitable for the golfer, is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A step of determining an optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
Including the step of selecting at least one of the golf club and the shaft that matches the optimum swingability index and the optimum rigidity index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The swingability index includes at least one of the moment of inertia around the shoulder of the golfer, the moment of inertia of the golf club, and the weight of the golf club.
Fitting method. A fitting program for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index and a second swing index related to the swing motion based on the measured value, and
The optimum swingability index, which is a swingability index of a golf club suitable for the golfer, is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A step of determining an optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
A computer is made to perform a step of selecting at least one of a golf club and a shaft that matches the optimum swingability index and the optimum rigidity index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The swingability index includes at least one of the moment of inertia around the shoulder of the golfer, the moment of inertia of the golf club, and the weight of the golf club.
Fitting program. A fitting device for selecting a golf club suitable for a golfer.
An acquisition unit that acquires the measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and
A calculation unit that calculates a first swing index and a second swing index related to the swing motion based on the measured values.
The optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A determination unit that determines the optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
A selection unit for selecting at least one of a golf club and a shaft that matches the optimum characteristic index and the optimum rigidity index is provided.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The optimum characteristic index is the optimum shaft weight, which is the weight of the shaft of the golf club suitable for the golfer.
Fitting device. In addition to the size of the first swing index, the determination unit determines the optimum characteristic index according to the type of head to be included in the golf club.
The fitting device according to claim 12. The determination unit determines an optimum swingability index, which is a swingability index of the golf club suitable for the golfer, according to the size of the first swing index, and the size of the optimum swingability index. The optimum characteristic index is determined according to
The swingability index includes at least one of the moment of inertia around the shoulder of the golfer, the moment of inertia of the golf club, and the weight of the golf club.
The fitting device according to claim 12 or 13. The determination unit uses the first swing index as an explanatory variable and substitutes the first swing index calculated by the calculation unit into a predetermined regression equation using the optimum swingability index as the objective variable. Calculate the optimum swingability index,
The fitting device according to claim 14. The determination unit uses the first swing index as an explanatory variable and substitutes the first swing index calculated by the calculation unit into a predetermined regression equation using the optimum characteristic index as an objective variable to obtain the optimum characteristics. Calculate the index,
The fitting device according to claim 12 or 13. A fitting device for selecting a golf club suitable for a golfer.
An input reception unit that accepts input of information from the user for determining the type of head to be included in the golf club.
A calculation unit that calculates the first swing index related to the golfer's swing motion,
A determination unit for determining an optimum shaft weight, which is the weight of the golf club shaft suitable for the golfer, is provided according to the size of the first swing index and the type of the head specified by the user.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and energy exerted by the golfer during the swing operation. At least one of the indicators indicating the torque exerted by the golfer during the swing operation is included.
The determination unit determines an optimum swingability index, which is a swingability index of the golf club suitable for the golfer, according to the size of the first swing index, and the size of the optimum swingability index. And the optimum shaft weight is determined according to the type of the head specified by the user.
The swingability index includes at least one of the moment of inertia around the shoulder of the golfer, the moment of inertia of the golf club, and the weight of the golf club.
Fitting device. A fitting device for selecting a golf club suitable for a golfer.
An acquisition unit that acquires the measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and
A calculation unit that calculates a first swing index related to the swing motion based on the measured value,
A golf club suitable for the golfer, depending on which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. After determining the optimum club index representing the characteristics of the whole or a specific part, if the first swing index calculated based on the measured value exists near the boundary of the plurality of regions, the optimum club index is present. And the decision to fix
A golf club that matches the optimum club index and a selection unit that selects at least one of the shafts are provided.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. It includes at least one index indicating energy and an index indicating torque exerted by the golfer during the swing operation.
Fitting device. A fitting device for selecting a golf club suitable for a golfer.
An acquisition unit that acquires the measured value obtained by measuring the swing motion of the test club by the golfer with a measuring device, and
A calculation unit that calculates a first swing index related to the swing motion based on the measured value,
A determination unit that determines an optimum club index that represents the characteristics of the entire golf club or a specific part suitable for the golfer according to the size of the first swing index.
A golf club that matches the optimum club index and a selection unit that selects at least one of the shafts are provided.
The first swing index is an index representing the swing motion on the swing plane, an index indicating the power output by the golfer's arm during the swing motion, and is input to the test club during the swing motion. At least one of an index indicating power, an index indicating energy exerted by the golfer during the swing operation, and an index indicating torque exerted by the golfer during the swing operation, and a head during the swing operation are included. Further indicators of speed and cock movement are included,
The determination unit includes the index indicating the power output by the golfer's arm, the index indicating the power input to the test club, the index indicating the energy exerted by the golfer, and the index during the swing operation. The optimum club index determined after determining the optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golfer according to the magnitude of at least one of the indexes indicating the torque exerted by the golfer. When the club index is equal to or less than a predetermined threshold value, the head speed is equal to or higher than the predetermined threshold value, and the index representing the movement of the cock is equal to or higher than the predetermined threshold value, the determined optimum club index is used. To fix,
Fitting device. It is a fitting method for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index and a second swing index related to the swing motion based on the measured value, and
The optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A step of determining an optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
Including the step of selecting at least one of the golf club and the shaft that matches the optimum characteristic index and the optimum rigidity index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The optimum characteristic index is the optimum shaft weight, which is the weight of the shaft of the golf club suitable for the golfer.
Fitting method. A fitting program for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index and a second swing index related to the swing motion based on the measured value, and
The optimum characteristic index representing the characteristics of a specific part of the golf club suitable for the golfer is determined according to the size of the first swing index, and the shaft of the shaft is determined according to the size of the second swing index. A step of determining an optimum rigidity index, which is a rigidity index indicating rigidity and is suitable for the golfer.
A computer is made to perform a step of selecting at least one of a golf club and a shaft that matches the optimum characteristic index and the optimum rigidity index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. An index indicating energy and at least one index indicating torque exerted by the golfer during the swing operation are included.
The second swing index is a feature amount that characterizes the swing motion by the golfer, in which a correlation with the optimum rigidity index is recognized.
The optimum characteristic index is the optimum shaft weight, which is the weight of the shaft of the golf club suitable for the golfer.
Fitting program. It is a fitting method for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index related to the swing motion based on the measured value, and
A golf club suitable for the golfer, depending on which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. After determining the optimum club index representing the characteristics of the whole or a specific part, if the first swing index calculated based on the measured value exists near the boundary of the plurality of regions, the optimum club index is present. And the steps to fix
Including the step of selecting at least one of the golf club and the shaft that matches the optimum club index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. It includes at least one index indicating energy and an index indicating torque exerted by the golfer during the swing operation.
Fitting method. A fitting program for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index related to the swing motion based on the measured value, and
A golf club suitable for the golfer, depending on which of the plurality of regions defined by dividing the space representing the first swing index belongs to the first swing index calculated based on the measured value. After determining the optimum club index representing the characteristics of the whole or a specific part, if the first swing index calculated based on the measured value exists near the boundary of the plurality of regions, the optimum club index is present. And the steps to fix
Have the computer perform steps to select at least one of the golf clubs and shafts that match the optimal club index.
The first swing index includes an index indicating the power output by the golfer's arm during the swing operation, an index indicating the power input to the test club during the swing operation, and the golfer exerting the first swing index during the swing operation. It includes at least one index indicating energy and an index indicating torque exerted by the golfer during the swing operation.
Fitting program. It is a fitting method for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index related to the swing motion based on the measured value, and
A step of determining an optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golfer according to the size of the first swing index.
Including the step of selecting at least one of the golf club and the shaft that matches the optimum club index.
The first swing index is an index representing the swing motion on the swing plane, an index indicating the power output by the golfer's arm during the swing motion, and is input to the test club during the swing motion. At least one of an index indicating power, an index indicating energy exerted by the golfer during the swing operation, and an index indicating torque exerted by the golfer during the swing operation, and a head during the swing operation are included. Further indicators of speed and cock movement are included,
The steps for determining the optimum club index include the index indicating the power output by the golfer's arm, the index indicating the power input to the test club, the index indicating the energy exerted by the golfer, and the index. After determining the optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golfer according to at least one magnitude of the index indicating the torque exerted by the golfer during the swing operation. The determination is made when the determined optimum club index is equal to or less than a predetermined threshold value, the head speed is equal to or greater than the predetermined threshold value, and the index representing the movement of the cock is equal to or greater than the predetermined threshold value. Including steps to modify the optimal club index,
Fitting method. A fitting program for selecting a golf club suitable for a golfer.
The step of acquiring the measured value measured by the measuring device for the swing motion of the test club by the golfer, and
A step of calculating a first swing index related to the swing motion based on the measured value, and
A step of determining an optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golfer according to the size of the first swing index.
And selecting at least one of a golf club and shaft that matches the optimum club indication is executed on the computer,
The first swing index is an index representing the swing motion on the swing plane, an index indicating the power output by the golfer's arm during the swing motion, and is input to the test club during the swing motion. At least one of an index indicating power, an index indicating energy exerted by the golfer during the swing operation, and an index indicating torque exerted by the golfer during the swing operation, and a head during the swing operation are included. Further indicators of speed and cock movement are included,
The steps for determining the optimum club index include the index indicating the power output by the golfer's arm, the index indicating the power input to the test club, the index indicating the energy exerted by the golfer, and the index. After determining the optimum club index representing the characteristics of the entire golf club or a specific part suitable for the golfer according to at least one magnitude of the index indicating the torque exerted by the golfer during the swing operation. The determination is made when the determined optimum club index is equal to or less than a predetermined threshold value, the head speed is equal to or greater than the predetermined threshold value, and the index representing the movement of the cock is equal to or greater than the predetermined threshold value. Including steps to modify the optimal club index,
Fitting program.

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