JP4201671B2 - Golf swing classification method and golf swing classification device - Google Patents

Description

The present invention relates to a golf swing classification apparatus implementing golf swing classification method, and the method of classifying a golf swing that golfer performed by gripping a golf club.

Many golfers find and purchase golf clubs suitable for themselves among the many golf clubs on the market in order to accurately and stably fly the golf ball and to increase the flight distance. try to. For example, whether or not it is easy to actually hit a golf ball by trial hitting and the degree of flight distance of the hit golf ball are used as judgment materials for purchase. However, it is often very difficult for a golfer to determine whether or not it is easy to hit a golf ball.
In contrast, golf manufacturers stratify golfers into several types and provide golf clubs suitable for each type.

  For example, the applicant recommends that a golfer purchase a golf club suitable for this head speed by measuring the head speed of the golf club head when the golf club is gripped and golf swing is performed. In this method, golfers can be stratified according to the difference in head speed, and a golf club suitable to some extent for the stratified golfers can be provided.

In recent years, however, the requirements of golfers when selecting a golf club have become finer. In addition, due to the increase in the size and length of the golf club head, there is a case where it is not always possible to provide a golf club that is optimal for a golfer's golf swing using only the head speed of the golf club head. It was.
In addition, today, it is strongly desired to provide an optimal golf club based on not only the difference in the head speed of the golf club but also the difference in the golf swing itself.

Accordingly, the present invention relates to a golf swing by a golfer in order to eliminate the above-described problems of the prior art, and can classify a golf swing of a golfer more clearly than a classification method based on the head speed of a golf club head. It is an object of the present invention to provide a golf swing classification method and a golf swing classification device that implements this method.

In order to achieve the above object, the present invention is a method for classifying golf swings performed by gripping a golf club, wherein a sensor for detecting the acceleration in the axial direction of a golf club shaft is provided on the golf club head. A measurement step for measuring the acceleration of the golf club head during the golf swing, and information on the acceleration peak in the time series data of the measured acceleration are extracted , and X% (X Is a step of extracting the value of the ratio of the acceleration peak value to the peak width at a level in the range of 50 to 90) as the sharpness of the acceleration peak, and using the peak information including the sharpness A golf swing classification method comprising: a classification step for classifying golf swings. .

The golf swing classification result is preferably used for selecting a golf club shaft by corresponding to the flex frequency of the golf club shaft.

Furthermore, the present invention is a golf swing classification device for classifying golf swings performed by holding a golf club, measuring means for measuring the acceleration of a golf club head in the axial direction of the golf club shaft, and the measured The acceleration peak information in the time series data of acceleration is extracted , and further, from this peak information, the acceleration peak value with respect to the peak width at the level of X% of the acceleration peak value (X is a predetermined value in the range of 50 to 90) is extracted. A golf swing classification comprising: extraction means for extracting a ratio value as the sharpness of an acceleration peak; and evaluation means for classifying and evaluating a golf swing using information on the peak including the sharpness Providing equipment.

  According to the present invention, the golf swing is classified by type using the information of the peak of the acceleration of the golf club head in the axial direction of the golf club shaft in the vicinity of the impact position, thereby comparing with the classification based on the head speed of the golf club head. The golf swing of the golfer can be classified more clearly, and an appropriate golf club can be provided accurately.

Hereinafter, the golf swing classification device of the present invention that implements the golf swing classification method of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing a schematic configuration of a golf swing classification device. FIG. 1 shows a state immediately before the golfer G performs a golf swing without hitting a golf ball.

  The golf swing classification device 10 includes an acceleration pickup 21 fixed to the golf club head 20, an amplifier 22, a processing unit 24, a monitor 26, and an impact position detection sensor 28.

The acceleration pickup 21 is an acceleration sensor that detects the axial acceleration of the golf club shaft 19 of the golf club head 20 during golf swing, and a piezoelectric element or a strain gauge type is used.
The amplifier 22 is a known amplification device that amplifies the acceleration signal from the acceleration pickup 21. The amplified acceleration signal is sent to the processing unit 24.
The acceleration pickup 21 supplies an acceleration signal to the amplifier 22 via a cable, but may be a wireless acceleration pickup.

  The processing unit 24 is a unit that samples the supplied acceleration signal, acquires time-series data of acceleration, extracts information about a peak at which the acceleration is maximum, and classifies the golf swing. An impact position detection sensor 28 that detects the passage of the golf club head 20 and outputs a detection signal such as a pulse signal is provided near the position of the tee 30 on which the golf ball is placed. Are connected so that a detection signal is supplied to the processing unit 24.

FIG. 2 schematically shows an example of acceleration time-series data obtained by the processing unit 24. The information related to the peak processing unit 24 extracts, for example, a sharpness position ΔT peak and a peak in the peak value G _p.
The peak value _Gp is the acceleration value at the position P where the acceleration is the maximum value.
The peak position ΔT is an acceleration peak position shift time based on the impact position obtained from the detection signal from the impact position detection sensor 28. When the peak position P comes before the impact position, the peak position ΔT takes a negative value. When the peak position P comes after the impact position, the peak position ΔT takes a positive value. Become.
On the other hand, the sharpness of the peak, for example, X% of the peak value G _p (X, for example 50 or more 90 or less real number) peak width at the level of, for example, X = 80 (%) and the peak width of the time T ₈₀ is obtained and is the ratio G _p / T ₈₀ of the peak value G _p to the peak width T ₈₀ . That is, the degree of peak sharpness. The higher the ratio, the sharper the peak.

Further, the processing unit 24, information of the obtained peak, for example, if the peak value G _p is extracted, compares the peak value G _p, with a predetermined and that the values to classify the golf swing, to classify examined belongs to which type peak value G _p is. Similarly, in the case where the peak position ΔT or the peak sharpness is extracted, the peak type ΔT or the peak sharpness belongs to which type the comparison is made with a value that defines a predetermined type. Find out and classify.
The processing unit 24 supplies the monitor 26 with the classification result and the peak information and acceleration time-series data that cause the classification result.

The monitor 26 displays acceleration time series data supplied from the processing unit 24, peak information extracted from the time series data, and classification results obtained from the peak information.
Thereby, the golfer G can know the classification result of his golf swing. Furthermore, a golf club having proper golf club shaft characteristics suitable for golf swing of the golfer G, for example, golf club shaft hardness and golf club kick point characteristics can be selected.

In such a golf swing classification method, the golf club head 20 is provided with the acceleration pickup 21 fixed, and golf swing by the golfer G is performed (step 100).
At that time, the acceleration of the golf club head by the acceleration pickup 21 is measured (step 102), and the acceleration signal is sent to the amplifier 22 and amplified. The amplified acceleration signal is sent to the processing unit 24, where peak information is extracted (step 104).
The peak information is, for example, the above-described peak value G _p , peak position ΔT, or peak sharpness.

Thereafter, the peak information is compared with a predetermined value for classifying the golf swing held in the processing unit 24, and the golf swing of the golfer G is classified by type (step 106).
Furthermore, acceleration time-series data, peak information extracted from the time-series data, and classification results obtained from the peak information are displayed on the monitor 26. The golfer G can select a golf club suitable for his golf swing by looking at the classification result displayed on the monitor 26.

Thus, the reason why golf swings can be classified by type by extracting information on the peak of acceleration in the axial direction of the golf club shaft is as follows.
In the golf swing, as shown in FIG. 4, the golf club is swung down from the top state, and the head speed of the golf club head becomes maximum near the impact position. At this time, the path of the golf club head draws a general arc. Therefore, by extracting the information of the peak of the acceleration of the golf club head in the axial direction of the golf club shaft when the head speed becomes maximum, the circular motion of the golf club head defined by the radius of the arc and the head speed. Acceleration information at the time of impact can be obtained. On the other hand, since the centrifugal force F acting on the center of gravity of the golf club head is proportional to this acceleration, the magnitude of the bending moment applied to the golf club shaft is determined by the centrifugal force F acting on the center of gravity of the golf club head. Due to this bending moment, the golf club shaft 19 undergoes bending deformation as shown in FIG.
On the other hand, since the loft angle of the golf club head when hitting the golf ball changes due to bending deformation at the time of impact of the golf club shaft, the trajectory and flight distance of the golf ball are greatly affected. Therefore, it is preferable that the bending deformation at the time of impact of the golf club shaft is appropriate. Therefore, the magnitude of the bending moment at the time of impact of the golf club shaft is estimated by measuring the acceleration in the axial direction of the golf club shaft, which is roughly determined by the radius of the circular orbit of the golf club head in the golf swing and the golf club head speed. Therefore, it is possible to set the golf club shaft hardness and kick point position appropriate for the bending moment. That is, by classifying the golf swing based on the acceleration peak information, an optimum golf club head can be provided for each classified type.

Table 1 below shows two types of golf club shafts having different kick points (first tone or original tone) for each of four types of golf club shafts having different hardness (differing frequencies of golf club shafts). That is, a golf club having a total of 8 (4 × 2) types of golf club shafts is prepared, and actually 12 golfers G _{a to} G _l try golf balls, and each person has his own golf swing. The characteristics of the golf club shaft of the golf club selected and judged to be the most suitable, that is, the golf club shaft proper for each person are described.
As for the flex frequency (cpm) of the golf club shaft, the higher the frequency, the harder the golf club shaft. The kick point represents the position where the curvature becomes maximum in bending deformation when a bending moment is applied from the golf club head side to the golf club shaft. The curvature is maximized at a position closer to the head, and the original tone means that the curvature is maximized at a position closer to the grip portion of the golf club shaft than the previous tone. That is, the first tone and the original tone represent the relative positional relationship of the position where the curvature is maximum.

On the other hand, Table 2 below shows the results of extracting peak information of accelerations of the golfers G _{a to} G ₁ using the golf swing classification device 10. At the same time, the result of measuring the head speed of the golf club head using a known head speed measuring sensor is shown. FIG. 5 shows time series data of accelerations of the golfers G _{a to} G _l .

According to Table 2, for example, golfers G _a and G _b have head speeds of 49 (m / s) and 47 (m / s), and golfers G _a and G _b have head speeds of 46 (m / s). is classified into the is type M46 or more, the golfer _G c ~G _e are classified as type M43 head speed is 43~45 (m / s). The golfers G _{f to} G _i are classified into a type M40 having a head speed of 40 to 42 (m / s), and the golfers G _{j to} G _l are a type M37 having a head speed of 37 to 39 (m / s). are categorized.
In such a conventional classification based on head speed, as shown in FIG. 6, it can be seen that each type M46, M43, M40 and M37 does not necessarily correspond to an appropriate flex frequency (cpm) of the golf club shaft.
Further, as shown in FIG. 7, it can be seen that the types 46, M43, M40 and M37 classified by the head speed do not necessarily correspond to the kick point (first tone or original tone).

On the other hand, FIG. 8 is a graph obtained by classifying the golf swing type I~IV using the peak value G _p. According to this, although there are differences in the classification of the golfer G _i, as the classification peak value G _p is high high golf club shaft of the flex vibration frequency it can be said to be proper. Thus, for high golf swing peak value G _p, it may provide a high flex frequency Golf Club. In the present invention, the peak value G _p, for example, a range of 50 or less, more than 50 65 or less in the range of golf swing is divided into a total of four types I~IV 70 the range and greater than 70 range greater than 65 Should be classified.

FIG. 9 is a graph in which golf swings are classified into types α to δ using a ratio G _p / T ₈₀ obtained by dividing a peak value G _p which is a peak sharpness by a peak width T ₈₀ . According to this, the ratio G _{p /} T ₈₀ high classification as flex vibration number of high golf club shaft of it can be said to be proper. Thus, for high golf swing of the ratio G _{p /} T _80, it may provide a high flex frequency Golf Club. In the present invention, the ratio G _p / T ₈₀ is divided into a total of four types α to δ, for example, a range of 550 or less, a range of 550 to 750, a range of 750 to 900 and a range of more than 900. Golf swings should be classified.

Thus, by classifying the golf swing using the peak value G _p or the ratio G _p / T ₈₀ , it is possible to point out an appropriate flex frequency of the golf club shaft in the vicinity of the impact position in the golf swing. The above acceleration is determined by the head speed of the golf club head and the radius of the circular arc path drawn by the golf club head. On the other hand, from the downswing to the impact and the follow-through, the wrist speed of the wrist can be used to shorten the head speed in a short time. In the type of golf swing that raises, the peak value G _p or the ratio G _p / T _{80 of the} acceleration is large, and in the type of golf swing that uses a lot of body turns without using wrist wrist cock relatively, the peak value G _p or small tendency ratio _G p _{/ T 80} Is by the present inventors have found that certain.
Accordingly, since the centrifugal force acting on the golf club head varies depending on the type of golf swing, the bending moment applied to the golf club shaft also varies. Therefore, a golf club shaft having an appropriate hardness according to the magnitude of the centrifugal force can be pointed out by the flex frequency.

  FIG. 10 is a graph in which golf swings are classified into types A and B using the peak position ΔT. According to this, it can be said that the original golf club shaft is appropriate in the type A in which the peak position ΔT is positive. Therefore, a golf club with a primary tone golf club shaft is used for a golf swing having a positive peak position ΔT, and a golf club having a pre-set golf club shaft for a golf swing having a negative peak position ΔT. It is good to provide.

  Thus, by classifying the golf swing using the peak position ΔT, which is the deviation time of the peak position based on the impact position, the appropriate kick point can be pointed out because the peak position ΔT is positive. By using the original golf club shaft that accelerates the bending deformation due to the centrifugal force of the golf club head against the golf swing that takes the peak value of acceleration after the golf club head passes the impact position, This is because the bending deformation of the golf club shaft can be adjusted. Similarly, for a golf swing having a negative peak position ΔT, a golf club shaft having a tone that slows the bending deformation due to the centrifugal force of the golf club head is used. The bending deformation can be adjusted.

  As described above, although it is not always possible to provide an appropriate golf club by classification based on the conventional head speed, in the present invention, golf swing is performed using information on the acceleration peak in the axial direction of the golf club shaft in the vicinity of the impact position. It can be classified by type, and an appropriate golf club can be provided accurately.

  In this way, a golfer who knows the type of golf swing of his / her own uses the classified golf swing type as a guide, and classifies the golf club classified using the acceleration peak information as a classification parameter. It can be easily selected based on display information such as a seal. Such golf clubs are classified according to the type of golf swing, by adjusting the hardness of the golf club shaft and the kick point of the golf club shaft such as the first tone and the original tone. That is, the characteristics of the golf club shaft are adjusted so as to be suitable for each type of golf swing.

The golf swing classification method and the golf swing classification device of the present invention are not limited to the above-described embodiments, and various improvements and modifications may be made without departing from the scope of the present invention. Of course.

It is a schematic block diagram of an apparatus at the time of classifying a golf swing of a golfer using a golf swing classification apparatus of the present invention. It is a figure explaining the information of the peak of acceleration obtained with the golf swing classification device shown in FIG. It is a flowchart which shows an example of the flow performed with the golf swing classification | category method of this invention. It is a figure explaining the deformation | transformation of the golf club shaft during a golf swing. It is a figure which shows the example of the time series data of the acceleration obtained with the golf swing classification | category method of this invention. It is a figure which shows an example of the relationship between the classification result by the conventional golf swing classification | category method, and an appropriate flex frequency. It is a figure which shows an example of the relationship between the classification result by the conventional golf swing classification method, and an appropriate kick point position. It is a figure which shows an example of the relationship between the classification result obtained with the golf swing classification method of this invention, and an appropriate flex frequency. It is a figure which shows the other example of the relationship between the classification result obtained with the golf swing classification method of this invention, and an appropriate flex frequency. It is a figure which shows an example of the relationship between the classification result obtained with the golf swing classification method of this invention, and an appropriate kick point position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Golf swing classification | category apparatus 18 Golf club 19 Golf club shaft 20 Golf club head 21 Acceleration pick-up 22 Amplifier 24 Processing unit 26 Monitor 28 Impact position detection sensor

Claims (3)

A method of classifying a golf swing performed by holding a golf club,
A measurement step of measuring the acceleration of the golf club head during a golf swing by providing a sensor for detecting an axial acceleration of the golf club shaft on the golf club head;
Information on the acceleration peak in the measured time series data of the acceleration is extracted, and further, from the peak information, the peak width at the level of X% of the acceleration peak value (X is a predetermined value in the range of 50 to 90) is extracted. An extraction step of extracting the value of the ratio of the acceleration peak values as the sharpness of the acceleration peak;
A golf swing classification method comprising: classifying a golf swing using information on the peak including the sharpness.   The golf swing classification method according to claim 1, wherein the golf swing classification result is used for selecting a golf club shaft by making it correspond to a flex frequency of the golf club shaft. A golf swing classification device for classifying golf swings performed by holding a golf club,
Measuring means for measuring the acceleration of the golf club head in the axial direction of the golf club shaft;
Information on the acceleration peak in the measured time series data of the acceleration is extracted, and the peak information at the level of X% (X is a predetermined value in the range of 50 to 90) of the acceleration peak value is extracted from the peak information. Extraction means for extracting the value of the ratio of acceleration peak values as the sharpness of the acceleration peak;
And an evaluation means for classifying and evaluating the golf swing using the peak information including the sharpness.

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