JP6940388B2 - Information processing equipment and programs - Google Patents

Description

The present invention relates to an information processing device and a program.

Patent Document 1 is an acoustic simulation device that calculates the sound pressure level at a predetermined sound receiving point in the room when sound is emitted from a sound source provided in the room, and describes the total surface area of the room and the total surface area of the room. An input receiving means for receiving an input of the average sound absorption coefficient in the room, a first sound pressure level calculating means for calculating the sound pressure level of the direct sound directly propagating from the sound source toward the sound receiving point, and the input. A second sound pressure level calculating means for calculating the sound pressure level of diffused sound diffused into the room from the sound source based on the total surface area received by the receiving means and the average sound absorption coefficient, and the first sound pressure level calculating means. The sound pressure level at the receiving point is determined based on the sound pressure level of the direct sound calculated by the sound pressure level calculating means and the sound pressure level of the diffused sound calculated by the second sound pressure level calculating means. Described is an acoustic simulation apparatus including a third sound pressure level calculating means for calculating.

Japanese Unexamined Patent Publication No. 2010-181824

An object of the present invention is to provide an information processing device and a program capable of predicting the ratio of the radiated sound radiated to the outside from the horn device to the input sound without a design drawing showing the spatial shape of the sound field. To do.

In order to achieve the above object, the present disclosure relates to a sound emitting device having a sound source arranged in a shielded space and an opening provided at a position facing the sound source, the opening of the opening. The opening of the input sound input from the sound source into the space using the input means for inputting each of the rate and the distance from the opening to the sound source, and the input aperture ratio and the distance. It is an information processing apparatus provided with a first calculation means for calculating the ratio of radiated sound radiated to the outside through a predetermined frequency.

The first calculation means includes an input aperture ratio, an amplitude of a standing wave of the frequency generated in the space by the input sound calculated using the distance, and an amplitude of the frequency in the input sound. The ratio of the radiated sound to the frequency may be calculated based on.

The input means may input the range of the distance, and the first calculation means may calculate the ratio of the radiated sound for each combination of the distance and the frequency.

The aperture ratio of the opening may be a ratio of the cross-sectional area of the opening at the boundary surface between the opening and the space to the cross-sectional area of the space.

The first aspect of the present disclosure is the aperture ratio of the opening and the aperture ratio of the opening of the sound emitting device including the sound source arranged in the shielded space and the opening provided at a position facing the sound source. Using the input means for inputting each of the distances from the opening to the sound source, the input aperture ratio and the distance, the input sound input from the sound source into the space passes through the opening. A storage means for storing in advance the relationship between the aperture ratio, the frequency, the distance, and the ratio of the radiated sound, and the first calculation means for calculating the ratio of the radiated sound radiated to the outside for a predetermined frequency. The first calculation means is an information processing device that calculates the ratio of the radiated sound using the relationship.

A second aspect of the present disclosure is the opening ratio of the opening and the opening ratio of the opening of the sound emitting device including the sound source arranged in the shielded space and the opening provided at a position facing the sound source. Using the input means for inputting each of the distances from the opening to the sound source, the input opening ratio and the distance, the input sound input from the sound source into the space passes through the opening. Based on the calculation results of the first calculation means for calculating the ratio of the radiated sound radiated to the outside for a predetermined frequency and the calculation result of the first calculation means, the ratio of the radiated sound for the frequency of the sound source is the maximum value. It is an information processing apparatus including a second calculation means for calculating a specific distance from the sound source to the opening.

A third aspect of the present disclosure is an aperture ratio of the opening and an aperture ratio of the opening of a sound emitting device including a sound source arranged in a shielded space and an opening provided at a position facing the sound source. Using the input means for inputting each of the distances from the opening to the sound source, the input aperture ratio and the distance, the input sound input from the sound source into the space passes through the opening. A first calculation means for calculating the ratio of radiated sound emitted to the outside with respect to a predetermined frequency, the opening is a grill of a vehicle, and the space is arranged inside the grill. It is an information processing device.

A fourth aspect of the present disclosure is a program for causing a computer to function as each means of an information processing device according to any one of the first to third aspects.

According to the present disclosure , it is possible to predict the ratio of the radiated sound radiated from the horn device to the input sound even if there is no design drawing showing the spatial shape of the sound field.

The first calculation means uses the input aperture ratio, the distance, and the amplitude of the standing wave of the frequency generated in the space by the input sound, and the amplitude of the frequency in the input sound. By calculating the ratio of the radiated sound to the frequency based on the above, the ratio of the radiated sound to the input sound can be theoretically predicted.

The input means inputs the range of the distance, and the first calculation means calculates the ratio of the radiated sound for each combination of the distance and the frequency, so that the radiated sound can be generated within a predetermined range. The ratio to the input sound can be theoretically predicted.

By setting the aperture ratio of the opening as a ratio of the cross-sectional area of the opening to the cross-sectional area of the space at the boundary surface between the opening and the space, the design value is smaller than that specified in the design drawing. From, the aperture ratio can be defined.

According to the first aspect and the corresponding fourth aspect of the present disclosure, the ratio of the radiated sound to the input sound can be easily obtained as compared with the case of experimentally obtaining the sound.

According to the second aspect and the corresponding fourth aspect of the present disclosure, it is possible to further determine the arrangement position of the sound source that maximizes the ratio of the radiated sound to the input sound.

According to the third aspect and the corresponding fourth aspect of the present disclosure, further, the input sound of the radiated sound radiated to the outside from the opening provided in the grill of the vehicle without the design drawing of the vehicle. The proportion can be predicted.

It is the schematic which shows an example of the structure of the horn device for a vehicle. It is a schematic diagram which shows an example of the sound field model of a horn device. It is a schematic diagram for demonstrating the opening ratio of a horn device. It is a flowchart which shows an example of the procedure of the design method of a horn device. It is a schematic diagram for demonstrating the derivation procedure of the function representing a standing wave. It is a schematic diagram for demonstrating the derivation procedure of a transmission coefficient. It is a graph which shows the dependence of the transmittance for each distance and frequency, and the frequency characteristic of a sound source. It is a block diagram which shows an example of the electric structure of an information processing apparatus. It is a flowchart which shows an example of a program flow. It is a top view which shows an example of a setting screen. It is a graph which shows the relationship between the transmittance and the distance.

Hereinafter, an example of the embodiment of the present invention will be described in detail with reference to the drawings.

<Horn device>
First, the structure of the horn device for a vehicle will be described.
FIG. 1 is a schematic view showing an example of the configuration of a horn device for a vehicle. The horn device for the vehicle is mounted on the front part of the engine room. The front part of the engine room is covered with moldings and covers, and the inside is shielded. A front grill is provided at the front of the space. The shielded space is opened to the outside by the front grill.

The horn, which is the sound source of the horn device, is arranged at a position facing the opening (front grill). For example, a sound source is arranged at a point I (Input), and an opening is arranged at a point O (Output). The direction from point I to point O is the sound traveling direction. The input sound (sound wave) input from the sound source propagates in the shielded space. The shielded space is the area where the sound waves exist, that is, the sound field.

In this embodiment, the sound field of the horn device is modeled. FIG. 2 is a schematic diagram showing an example of a sound field model of the horn device. In the sound field model, the space 10 corresponding to the sound field is located between the first boundary surface 10A and the second boundary surface 10B facing each other.

A sound source 12 is arranged on the first boundary surface 10A. An opening 14 is provided at a position of the second boundary surface 10B facing the sound source 12. The distance from the opening 14 to the sound source 12 is defined as "distance L ₁ ".

In the illustrated example, the shape of the space 10 is a cylinder extending in the sound traveling direction. The space 10 may be a shielded space, and the shape of the space 10 is not limited to a cylindrical shape having a circular cross-sectional shape. For example, the shape of the space 10 may be a rectangular parallelepiped having a rectangular cross section.

FIG. 3 is a schematic diagram for explaining the opening ratio of the horn device. _{Let S 1 be} the cross-sectional area of the space 10 _{and S 0 be} the cross-sectional area of the opening 14 on the second boundary surface 10B. The aperture ratio of the opening 14 is defined as the "aperture ratio m". The opening ratio m is represented by _{(S 0} / S _1).

In the present embodiment, it is assumed that the sound wave generated from the sound source 12 is a plane wave. A plane wave has a uniform sound pressure on a plane parallel to the plane on which the sound source is arranged. Further, the reflection coefficient at the first boundary surface 10A where the sound source 12 is arranged is set to 1, and the transmission coefficient is set to 0.

A part of the sound wave directed to the second boundary surface 10B passes through the opening 14 and is emitted to the outside. The rest of the sound wave directed to the second boundary surface 10B is reflected by the second boundary surface 10B. Further, the sound wave directed to the first boundary surface 10A is reflected by the first boundary surface 10A. A standing wave is generated in the space 10 due to the interference of a plurality of sound waves having different traveling directions and phases.

In this embodiment, the ratio as described above, by using a sound field model that are each defined distance L ₁ and the opening ratio m, the input sound emission sound emitted to the outside through the opening 14 ( Permeability) is predicted. A blueprint that defines the detailed dimensions of the spatial shape that serves as the sound field is not used.

<Design method of horn device>
Next, a method of designing the horn device will be described.
FIG. 4 is a flowchart showing an example of the procedure of the design method of the horn device.
The design method of the horn device according to the present embodiment includes a step of defining a setting space (step 100), a step of optimizing the transmittance (step 200), a step of specifying the frequency of the sound source (step 300), and an optimum step. The step (step 400) of outputting the distance is included.

(Process of defining the setting space)
In the process of defining the setting space, the sound field model, which is the design space, is defined by using the aperture ratio of the opening and the distance from the opening to the sound source as input values (design variables). Here, the _{range that the distance L 1} can take is set.

(Process to specify the frequency of the sound source)
In the step of specifying the frequency, first, the frequency characteristic of the sound source is acquired (step 302). Next, the dominant frequency in the sound source is specified from the frequency characteristics acquired in step 302 (step 304). The specified frequency is called the "sound source frequency".

(Process for optimizing transmittance)
In the step of optimizing the transmittance, the transmittance is roughly divided into two steps. Here, the transmittance refers to the ratio of the radiated sound that passes through the opening and is output to the outside to the input sound that is input from the sound source into the space. First, the transmittance is calculated for each combination of the distance from the opening to the sound source and the frequency within the set distance range (step 202).

Next, using the calculation result obtained in step 202 and the frequency of the sound source obtained in the step of specifying the frequency, the optimum distance for optimizing the transmittance of the radiated sound having the frequency of the sound source is specified. (Step 204). Here, optimization means bringing the transmittance closer to the target value. The target value may be, for example, a maximum value or a minimum value. Hereinafter, the step of calculating the transmittance (step 202) will be briefly described. Details will be described later.

First, the standing wave generated in the space is obtained (step 212). Subsequently, the transmission coefficient at the boundary surface between the space and the opening is obtained (step 214). Next, the standing wave is multiplied by the transmission coefficient to obtain the radiated sound (step 216). Then, the transmittance, which is the ratio of the radiated sound to the input sound, is obtained (step 218).

Standing wave is represented the distance L ₁ and wave number k as a function of a variable. k represents the wave number. The wave number is the number of waves per unit length. The relationship between the wave number k and the frequency f is represented by f = ck (c is the speed of sound). The frequency f ₁ of the sound source is converted into the wave number k _1. The transmission coefficient is represented by a function whose variable is the opening ratio m.

Therefore, in the step of calculating the transmission, results of calculating the various distances L ₁ and wave number k as an input value, the distance L ₁ and the transmittance of the radiation sound corresponding to the wave number k is output. Further, when the wave number k ₁ corresponding to the frequency f ₁ of the sound source is given, the transmittance of the radiated sound corresponding to the distance L ₁ and the wave number k _{1 is output.}

(Process to output the optimum distance)
In the step of outputting the optimum distance, the optimum distance specified in step 204 is output as the optimum design value. For example, in the design of the horn unit, the number representing the wave number k ₁ corresponding to the frequency of the sound source is input, numerical values representing the distance L _1Best to maximize transmission of radiated sound is output.

(Standing wave)
Next, a description will be given of the derivation of the standing wave of the wave number k ₁ corresponding to the frequency of the sound source.
FIG. 5 is a schematic diagram for explaining a procedure for deriving a function representing a standing wave.
Calculate the steady-state response of sound pressure in space to the input from the sound source. First, the amplitude A ₁ of the forward _component, wave amplitude B ₁ of the reverse component proceeds respectively, the amplitude A ₁ after reciprocating the sound field ', B _1' represents a change to the following formula (1).

The amplitude of the forward component of the stationary wave generated in the space A _S, the amplitude of the reverse component and B _S. Each amplitude A _S, the reverse component amplitude B _S forward component is represented by the following formula (2).

In the above formula (1) and the above formula (2), r _1L is the reflectance coefficient at the second interface between the space and the opening. r _1R is the reflectance coefficient at the first interface where the sound source is arranged. L ₁ represents the distance from the opening to the sound source.

Further, _Binput is the amplitude of the input sound input from the sound source. I is an identity matrix. i is the number of times the sound wave is reflected. In the above equation (2), a standing wave is calculated by setting the number of reflections to infinite (i = ∞).

(Transmission coefficient)
Next, the derivation of the transmission coefficient will be described.
FIG. 6 is a schematic diagram for explaining the procedure for deriving the transmission coefficient. In the present embodiment, the transmission coefficient is analytically defined on the assumption that the cross-sectional area changes between the space and the opening. The permeability coefficient of the opening may be identified experimentally.

First, in the cross-sectional area change portion, the following equations (3) and (4) hold from the continuity of the sound pressure p and the continuity of the volume velocity U. The subscript is the number of the sound field. Let the sound field of the opening be the sound field 0 and the sound field of the space be the sound field 1.

In the above equation (3), p ₀ represents the sound pressure of the opening, and p ₁ represents the sound pressure of the space. _{U 0 in the} above formula (4) represents the volume density of the opening, and U ₁ represents the volume density of the space. The sound pressure p is represented by the following formula (5), and the volume velocity U is represented by the following formula (6).

In the above formula (5) and the above formula (6), i is 0 or 1. S ₀ represents the cross-sectional area of the opening, and S ₁ represents the cross-sectional area of the space. ρ ₀ represents the density of air in the opening and ρ ₁ represents the density of air in space. c ₀ represents the speed of sound in the opening, and c ₁ represents the speed of sound in space. ω is the angular frequency.

A sound wave having an amplitude B ₀ of the backward component propagates in the sound field 0. Amplitude A ₁ of the forward _component, wave amplitude B ₁ of the reverse component propagates the sound field 1. Here, the incident from the sound field 1 to the sound field 0 is considered. Since there is no sound wave incident on the boundary from the sound field 0, the amplitude A ₀ = 0 of the forward component.

Substituting the above equation (5) into the above equation (3) and setting A ₀ = 0 and x = 0, the following equation (3-1) is obtained.

Substituting the above equation (6) into the above equation (4) and setting A ₀ = 0, x = 0, ρ ₀ = ρ ₁ , and c ₀ = c ₁ , the following equation (4-1) is obtained.

From the above formula (3-1) and the above formula (4-1), the relationship of the following formula (4-2) can be obtained.

Transmission coefficient t _G of the cross-sectional area changing portion is a percentage of the amplitude B ₁ of the input sound amplitude B ₀ of radiated sound, by using the relation of the above-mentioned formula (4-2) represented by the following formula (7).

In the above formula (7), m is the opening ratio of the opening and is represented by the ratio of the cross-sectional area of the space to the cross-sectional area of the opening (m = S ₀ / S ₁ ).

(Transmittance)
By multiplying the standing wave by the transmission coefficient t _{G , the radiated sound t GB s} radiated to the outside through the opening is obtained. Of the input sound from the horn, paying attention to the sound of the frequency f ₁ of the sound source. Of amplitude _{B input The} input sound frequency _{f 1,} is defined by the following equation (8) the ratio of radiated sound _t G _{B s} of frequency _{f 1} as "transmittance alpha _T".

From the opening to a plurality of combinations distances L ₁ and the frequency f (= kc) each to the sound source, it calculates the transmittance alpha _T represented by the above formula (8). The calculation results are shown graphically in FIG.

FIG. 7 is a graph showing the dependence of the transmittance on each distance and frequency and the frequency characteristics of the sound source. The horizontal axis is the frequency f, and the vertical axis (left side) is the distance L _1. The magnitude of the transmittance α _T is indicated by shading. As shown in the gauge shown at the bottom of the graph, the transmittance α _T is in the range of 0 to 1. The closer to black, the larger the transmittance, and the closer to white, the smaller the transmittance.

Further, in FIG. 7, the frequency characteristics of the sound source are illustrated by solid lines. The horizontal axis is the frequency f, and the vertical axis (right side) is the sound pressure. In the case of this sound source, frequencies around 3000 Hz, which are 8th and 9th overtones, are dominant. The frequency f ₁ of the sound source is 3000 Hz.

Therefore, the optimum distance L _{1best for optimizing the transmittance α T} is specified at a frequency of around 3000 Hz. For example, to maximize transmission alpha _T is such that the distance L ₁ from the opening to the sound source is "0.08m" and "0.14m", it is understood that it may be arranged sound source.

<Program>
Next, a program executed by the information processing device will be described.
FIG. 8 is a block diagram showing an example of the electrical configuration of the information processing device. As shown in FIG. 8, the information processing device 20 includes an information processing unit 21. The information processing unit 21 is configured as a computer that performs various calculations. That is, the information processing unit 21 includes a CPU (Central Processing Unit) 21A, a ROM (Read Only Memory) 21B, a RAM (Random Access Memory) 21C, a non-volatile memory 21D, and an input / output unit (I / O). ) 21E is provided.

Each of the CPU 21A, ROM 21B, RAM 21C, memory 21D, and I / O 21E is connected via the bus 21F. The CPU 21A reads, for example, a program stored in the ROM 21B, and executes the program using the RAM 21C as a work area. Further, a display unit 22 such as a display, an input unit 24 such as a keyboard and a mouse, a communication unit 26, and a storage unit 28 are connected to the I / O 21E of the information processing unit 21.

The communication unit 26 is an interface for communicating with an external device via a wired or wireless communication line. For example, it functions as an interface for communicating with an external device such as a computer connected to a network such as a LAN (Local Area Network) or the Internet. The storage unit 28 is an external storage device such as a hard disk.

In the present embodiment, a program for simulating the radiation characteristics of the horn device is stored in the storage unit 28. Further, the function representing the above-mentioned "transmittance α _T " is also stored in the storage unit 28.

The storage area for storing programs and functions is not limited to the storage unit 28. The various programs and functions may be stored in another storage device such as the memory 21D or the ROM 21B, or may be acquired from an external device via the communication unit 26.

Further, various drives may be connected to the information processing unit 21. Various drives are devices that read data from a computer-readable portable recording medium such as a CD-ROM or USB (Universal Serial Bus) memory, or write data to the recording medium. When various drives are provided, a program or function may be recorded on a portable recording medium, and the program or function may be read and executed by the corresponding drive.

Next, the flow of the simulation program will be described.
FIG. 9 is a flowchart showing an example of the program flow.
When the user instructs the execution of the program, the simulation program is read from the storage unit 28 by the CPU 21A of the information processing device 20 and executed.

First, in step 600, the relationships between the aperture ratio, the distance from the opening to the sound source, the frequency (wave number), and the transmittance are acquired. For example, the above equation (8) is read from the storage device. Next, in step 602, the setting screen is displayed on the display unit. FIG. 10 is a plan view showing an example of the setting screen. As shown in FIG. 10, the setting screen 30 includes a sound field model 32, setting fields 34, 36, 39, 40, 41, options 38, an execute button 42, a cancel button 44, and the like.

The sound field model 32 illustrates various variables that define the sound field model. The setting field 34 is a field for setting the value of the opening ratio m. Setting column 36 is a field for setting the value of the frequency f ₁ of the sound source. Option 38 displays three options: "obtain the optimum distance", "obtain the transmittance at the set distance", and "display the relationship between the distance and the transmittance".

Choices "finding the optimum distance." Involves setting column 39 for setting a range (lower limit / upper limit) that can be taken of the distance L ₁ from the opening to the sound source. Choices "obtaining the transmittance at the set distance." Involves setting column 40 for setting a distance L ₁ from the opening to the sound source. Choices "relationship between the distance between the transmittance Show." Involves setting column 41 for setting a range (lower limit / upper limit) that can be taken of the distance L ₁ from the opening to the sound source.

Next, in step 604, the setting is accepted. For example, in the example shown in FIG. 10, the frequency f ₁ each value of the aperture ratio m and the sound source is set by the user, and one option is selected and the execution button 42 is pressed, the setting is accepted. Incidentally, "obtaining the transmittance at the set distance." Is when it is selected, the value of the distance L ₁ is also set. Otherwise, the distance L ₁ of the possible range (lower limit / upper limit) is set.

Next, in step 606, the transmittance is calculated for each distance for the set frequency. Frequency is converted to wave number. Given the aperture ratio and the wave number (frequency) in relation to the aperture ratio, the distance from the opening to the sound source, the frequency (wave number), and the transmittance, the transmittance is a function of the distance. FIG. 11 is a graph showing the relationship between the transmittance and the distance. For example, the relationship between the transmittance and the distance can be given by a graph in which the horizontal axis is the distance and the vertical axis is the transmittance.

Next, in step 608, it is determined whether or not "obtain the optimum distance" is selected. If selected, the process proceeds to step 610, and if not selected, the process proceeds to step 614. In step 610, the distance for optimizing the transmittance is calculated under the set aperture and frequency. At step 612, the optimum distance for optimizing the transmittance is displayed and the routine ends.

In step 614, it is determined whether or not "obtaining the transmittance at the set distance" is selected. If selected, the process proceeds to step 616, and if not selected, the process proceeds to step 620. In step 616, under the set aperture and frequency, the transmittance according to the set distance is calculated. Subsequent step 618 displays the calculated transmittance and ends the routine.

When "Calculate the transmittance at the set distance" is not selected, "Display the relationship between the distance and the transmittance" is selected. Therefore, in step 620, the relationship between the transmittance and the distance according to the set frequency is displayed, and the routine ends.

<Modification example>
It is needless to say that the configurations of the information processing apparatus and the program described in the above-described embodiment are examples, and the configurations may be changed within a range that does not deviate from the gist of the present invention.

For example, in the above embodiment, an example of modeling the sound field of a horn device for a vehicle has been described, but this model can also be used for other sound fields in which sound is radiated from the inside of a shielded space to the outside. Can be applied.

10 Space 10A Boundary surface 10B Boundary surface 12 Sound source 14 Opening 20 Information processing device 21 Information processing unit 22 Display unit 24 Input unit 26 Communication unit 28 Storage unit 30 Setting screen 32 Sound field model 34 Setting field 36 Setting field 38 Option 39 Setting Field 40 Setting field 41 Setting field 42 Execute button 44 Cancel button

Claims (4)

For a sound emitting device having a sound source arranged in a shielded space and an opening provided at a position facing the sound source, the aperture ratio of the opening and the distance from the opening to the sound source. Input means for inputting each of
Using the input opening ratio and the distance, the ratio of the input sound input from the sound source into the space to the outside through the opening is calculated for a predetermined frequency. The first calculation means to be
A storage means that previously stores the relationship between the opening ratio, the frequency, the distance, and the ratio of the radiated sound.
With
The first calculation means calculates the ratio of the radiated sound using the relationship.
Information processing device. For a sound emitting device having a sound source arranged in a shielded space and an opening provided at a position facing the sound source, the aperture ratio of the opening and the distance from the opening to the sound source. Input means for inputting each of
Using the input opening ratio and the distance, the ratio of the input sound input from the sound source into the space to the outside through the opening is calculated for a predetermined frequency. The first calculation means to be
Based on the calculation result of the first calculation means, the second calculation means for calculating a specific distance from the sound source to the opening where the ratio of the radiated sound becomes the maximum value with respect to the frequency of the sound source.
Information processing device equipped with. For a sound emitting device having a sound source arranged in a shielded space and an opening provided at a position facing the sound source, the aperture ratio of the opening and the distance from the opening to the sound source. Input means for inputting each of
Using the input opening ratio and the distance, the ratio of the input sound input from the sound source into the space to the outside through the opening is calculated for a predetermined frequency. The first calculation means to be
With
The opening is the grille of the vehicle, and the space is arranged inside the grille.
Information processing device. A program for causing a computer to function as each means of the information processing apparatus according to any one of claims 1 to 3.

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