Vehicle exterior noise measurement device, vehicle exterior noise measurement method, and program

Abstract

To provide a vehicle exterior noise measuring device capable of improving convenience.SOLUTION: The vehicle exterior noise measurement device 10 includes an information acquisition unit 400, a calculation unit 401, a measurement result generation unit 402, and a display control unit 403. The information acquisition unit 400 acquires information on the magnitude of the sound at each of the plurality of detection positions. The calculation unit 401 calculates, for each of the plurality of detection positions, the intensity of noise radiated from each tire of the vehicle in a direction toward the detection position. The measurement result creation unit 402 creates a first noise map in which the intensity of the noise corresponding to each of the plurality of detection positions calculated by the calculation unit 401 and the direction of the noise are mapped in association with each other. The display controller 403 displays the first noise map.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an exterior noise measuring device, an exterior noise measuring method, and a program. [Background technology]

[0002] A conventional noise testing method is described in the following Patent Document 1. In this noise testing method, the noise of a vehicle is measured when the vehicle reaches a predetermined position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 009120 Summary of the Invention [Problem to be solved by the invention]

[0004] The method described in Patent Document 1 has the problem that it is difficult for the user to grasp the vehicle noise, which is a factor that reduces convenience.

[0005] The present invention has been made in view of the above circumstances, and its object is to provide an exterior noise measuring device, an exterior noise measuring method, and a program that can improve convenience. [Means for solving the problem]

[0006] An exterior noise measurement device that solves the above problem is an exterior noise measurement device that measures noise generated from an object placed indoors, and includes an information acquisition unit, a calculation unit, a measurement result creation unit, and a display control unit. The information acquisition unit acquires sound volume information at each of multiple detection positions from multiple sound detection units that are placed at multiple detection positions set at predetermined intervals in an area surrounding the object. The calculation unit calculates, for each of the multiple detection positions, the intensity of noise radiated in a direction from the acoustic center toward the detection position, based on the distance from the object's predetermined acoustic center to the detection position and the sound volume detected by the sound detection units. The measurement result creation unit creates a first noise map that associates the noise intensity calculated by the calculation unit for each of the multiple detection positions with the direction of the noise. The display control unit displays the first noise map.

[0007] An exterior noise measurement method that solves the above problem is an exterior noise measurement method in which a computer measures noise generated from an object placed indoors, in which the computer acquires information on the sound volume at each of a plurality of detection positions from a plurality of sound detection units that are placed at a plurality of detection positions set at a predetermined interval in the area surrounding the object, calculates the intensity of the noise radiated in the direction from the acoustic center toward the detection position for each of the plurality of detection positions based on the distance from the predetermined acoustic center of the object to the detection position and the sound volume detected by the sound detection units, creates a first noise map that associates the noise intensity corresponding to each of the plurality of detection positions with the direction of the noise, and displays the first noise map.

[0008] A program that solves the above problem is a program for causing a computer to measure noise emitted from an object placed indoors, and causes the computer to acquire information on the sound volume at each of a plurality of detection positions from a plurality of sound detection units that are placed at a plurality of detection positions set at a predetermined interval in an area surrounding the object, calculate the intensity of the noise radiated in the direction from the acoustic center toward the detection position for each of the plurality of detection positions based on the distance from the predetermined acoustic center of the object to the detection position and the sound volume detected by the sound detection units, create a first noise map that associates the noise intensity corresponding to each of the plurality of detection positions with the direction of the noise, and display the first noise map.

[0009] According to this configuration, the user can visually recognize the intensity of the noise generated from the object by looking at the first noise map, thereby improving convenience. [Effects of the Invention]

[0010] The vehicle exterior noise measuring device, vehicle exterior noise measuring method, and program of the present invention can improve convenience. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a block diagram showing a schematic configuration of an exterior noise measuring device according to an embodiment; [Figure 2] 1 is a diagram showing a schematic diagram of an example of vehicle arrangement in an exterior noise measuring device according to an embodiment; [Figure 3] 1 is a diagram showing a schematic arrangement example of a vehicle and a microphone device in an exterior noise measuring device according to an embodiment; [Figure 4] 10 is a diagram showing an example of detection positions of the microphone device according to the embodiment. [Figure 5] 10A to 10C are timing charts showing the transitions of the noise detection value, distance attenuation correction value, and corrected sound detection value acquired by the microphone device. [Figure 6]4 is a flowchart showing a procedure of a process executed by a calculation unit of the embodiment. [Figure 7] 4 is a flowchart showing an example of the operation of the vehicle exterior noise measuring device according to the embodiment. [Figure 8] 1 is a diagram showing an example of vehicle noise measurement performed by the vehicle exterior noise measuring device of the embodiment; [Figure 9] 1 is a diagram showing an example of a microphone device of an embodiment, a detection position, a detected value of noise, the noise intensity at the detection position, the distance from the acoustic center to the detection position, the amount of distance attenuation, the noise level radiated from the acoustic center, and the noise intensity radiated from the acoustic center. [Figure 10] 1 is a diagram showing an example of a microphone device of an embodiment, a detection position, a detected value of noise, the noise intensity at the detection position, the distance from the acoustic center to the detection position, the amount of distance attenuation, the noise level radiated from the acoustic center, and the noise intensity radiated from the acoustic center. [Figure 11] FIG. 4 is a diagram showing an example of a first noise map according to the embodiment. [Figure 12] FIG. 4 is a diagram showing an example of a second noise map according to the embodiment. [Figure 13] FIG. 4 is a diagram showing an example of a first noise map according to the embodiment. [Figure 14] FIG. 4 is a diagram showing an example of a second noise map according to the embodiment. [Figure 15] FIG. 1 is a block diagram showing a hardware configuration of a computer according to an embodiment. [Figure 16] FIG. 4 is a diagram showing an example of a first noise map according to the embodiment. [Figure 17] FIG. 4 is a diagram showing an example of a second noise map according to the embodiment. [Figure 18] 3 is a diagram showing an example of a graph created by the vehicle exterior noise measuring device of the embodiment. FIG. [Figure 19] 10 is a diagram showing a schematic example of the arrangement of a vehicle and a microphone device in an exterior noise measuring device according to another embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of a vehicle exterior noise measuring device, a vehicle exterior noise measuring method, and a program will be described below with reference to the drawings. To facilitate understanding, the same components in the drawings will be assigned the same reference numerals as much as possible, and duplicated descriptions will be omitted.

[0013] <Embodiment> First, an outline of the vehicle exterior noise measuring device of this embodiment will be described.

[0014] (Outline of exterior noise measuring device) The exterior noise measuring device 10 of this embodiment shown in Figure 1 is an apparatus used for indoor pass-by testing, which measures vehicle pass-by noise indoors. In an indoor pass-by test, for example, a chassis dynamometer is installed in a semi-anechoic chamber, and multiple microphone devices are arranged in a row on at least one of the right and left sides of the vehicle, parallel to the vehicle's direction of travel. A vehicle mounted on the chassis dynamometer is then driven, and the sounds emitted from the vehicle are measured by the multiple microphone devices, thereby performing a simulation. The output signals of each microphone device are then processed based on factors such as vehicle speed to obtain exterior noise measurement results that include Doppler correction.

[0015] (Outline of the exterior noise measuring device) Next, the specific configuration of the exterior noise measuring device 10 will be described.

[0016] As shown in FIG. 1, exterior noise measuring device 10 is placed in a semi-anechoic chamber Sa. As shown in FIG. 2, a chassis dynamo device 120 is placed on floor 130 of semi-anechoic chamber Sa. A vehicle 100 is fixed on chassis dynamo device 120. Chassis dynamo device 120 includes rollers 121 on which tires 100a of vehicle 100 are placed, for example. In chassis dynamo device 120, tire 100a of vehicle 100 rotates on roller 121, thereby simulating the state in which vehicle 100 is running. At this time, it is possible to make the running conditions of vehicle 100 closer to actual running conditions by, for example, appropriately changing the load on roller 121. Exterior noise measuring device 10 of this embodiment is set in a position where it can measure sound from tire 100a of vehicle 100, which is a noise-generating object.

[0017] As shown in FIG. 1, the vehicle exterior noise measuring device 10 includes a plurality of microphone devices M1 to M 13 The system includes a control unit 40, a storage unit 50, an input unit 60, and an output unit .

[0018] As shown in FIG. 3, a plurality of microphone devices M1 to M 13 are arranged in a row on the right side of the vehicle 100.

[0019] 3, the direction indicated by the arrow RH indicates the right direction of the vehicle 100, and the direction indicated by the arrow LH indicates the left direction of the vehicle 100. The direction indicated by the arrow FR indicates the forward direction of the vehicle 100, and the direction indicated by the arrow BA indicates the rearward direction of the vehicle 100. Furthermore, the direction indicated by the arrow RL indicates the left-right direction of the vehicle 100, and the direction indicated by the arrow FB indicates the front-rear direction of the vehicle 100.

[0020] In the following, each position when the vehicle 100 is viewed from above as shown in FIG. 3 will be represented by a position (x, y) on the x-axis and y-axis. As shown in FIG. 3, the origin O (0, 0) of the x-axis and y-axis is set at a position in front of the vehicle 100. The x-axis is set to be parallel to the vehicle longitudinal direction FB, and the vehicle rearward direction BA is set to be the positive direction and the vehicle forward direction FR is set to be the negative direction. The y-axis is set to be parallel to the vehicle lateral direction RL, and the vehicle rightward direction RH is set to be the positive direction and the vehicle leftward direction LH is set to be the negative direction. In the following, the coordinate system of the x-axis and y-axis will be referred to as the xy coordinate system. The x value and y value of the position (x, y) each represent the distance (unit: [m]) from the origin O. 3, the position Pt1 of the right front tire 101 of the vehicle 100 is expressed as (1, 0.7), which indicates that the right front tire 101 of the vehicle 100 is located at a position offset from the origin O in the rearward direction BA of the vehicle and 0.7 m in the rightward direction RH of the vehicle. Similarly, the positions Pt2 to Pt4 of the left front tire 102, right rear tire 103, and left rear tire 104 of the vehicle 100 are each expressed as a position in the xy coordinate system.

[0021] As shown in FIG. 3, microphone devices M1 to M 13 is the position Pm1~Pm 13 As shown in FIG. 4, the detection positions Pm1 to Pm 13 are set at positions in the xy coordinate system as shown in Fig. 4. As is clear from Fig. 4, the plurality of microphone devices M1 to M 13 are arranged at predetermined intervals in the vehicle front-rear direction FB.

[0022] Microphone units M1 to M 13 is the detection position Pm1 to Pm 13 The microphone devices M1 to M each detect the loudness (in decibels [dB]) of the noise at each of the microphone devices M1 to M, and transmit an output signal corresponding to the detected loudness of the noise to the control unit 40. 13is an example of a sound detection unit. In this embodiment, the sound pressure level Lp (unit: dB) is used as the loudness of the sound, but sound pressure (unit: Pa) may also be used.

[0023] 1 stores various data held by the exterior noise measuring device 10. For example, the storage unit 50 stores various programs for operating the exterior noise measuring device 10.

[0024] The input unit 60 is a device for receiving input operations from a user, and is configured with at least one of a keyboard, a touch panel, a mouse, and a microphone, for example. The output unit 70 is a device capable of displaying various screens, such as a liquid crystal display, an organic EL (Electro Luminescence), or a touch panel.

[0025] The control unit 40 controls the exterior noise measuring device 10. For example, the control unit 40 has an information acquisition unit 400, a calculation unit 401, a measurement result creation unit 402, and a display control unit 403 as functional components realized by executing a program stored in the storage unit 50.

[0026] The information acquisition unit 400 includes microphone devices M1 to M 13 Based on the signals output from each of the detection positions Pm1 to Pm 13 Noise intensity P1~P 13 In the following, the noise intensities P1 to P2 acquired by the information acquisition unit 400 are 13 The noise detection values ​​P1 to P 13 For example, the information acquisition unit 400 acquires the microphone devices M1 to M 13 The noise detection values ​​are acquired at predetermined time intervals in this order. 13In other words, the sound detection position changes relatively from detection position Pm1 toward the rear of the vehicle BA. As a result, it is possible to simulate a situation in which the vehicle 100 passes through a fixed sound detection position. Note that by changing the predetermined time interval, it is also possible to arbitrarily change the simulated traveling speed of the vehicle 100.

[0027] In addition, the microphone device M i The noise detection value P obtained by i If these detection values ​​P are used as they are, the detection values ​​P will be connected in a step-like manner as shown in FIG. 5(A). Note that i=1, 2, . . . , 13. To avoid this, the information acquisition unit 400 uses a distance attenuation correction coefficient ΔP as shown in FIG. 5(B) to calculate the detection values ​​P i ,P i+1 ,P i+2 By correcting the above, a continuous curve of the detected value P as shown in FIG. 5(C) may be obtained.

[0028] The calculation unit 401 calculates the number of detection positions Pm1 to Pm2 detected by the information acquisition unit 400. 13 The detected noise values ​​P1 to P 13 Based on this, each detection position Pm1 to Pm 13 The intensity of the noise radiated in the direction toward the vehicle 100 is calculated. For example, if there is one sound source, the position Om of the acoustic center is set to the position of the sound source. For example, if the sound source is set to the right front tire 101 of the vehicle 100, the position Om of the acoustic center is set to the position of the right front tire 101. Also, if the sound sources are the right front tire 101 and the left front tire 102 of the vehicle 100, the acoustic center is set to a position Pt between these positions Pt1 and Pt2 as shown in FIG. 12 In addition, when the sound sources are the right rear tire 103 and the left rear tire 104 of the vehicle 100, the acoustic center is set at a position Pt 34 is set to

[0029] 6 shows the procedure of the calculation process performed by the calculation unit 401. As shown in FIG. 6, the calculation unit 401 first calculates the predetermined detection position Pm i Microphone device M i The noise detection value P i From the detection position Pm i Sound intensity at I i (Sound intensity, unit is [W / m 2 ]) is calculated based on the following formula f1 (step S10).

[0030]

number

[0031] The sound intensity I is expressed as "I=p 2 / (ρc) where p is the sound pressure (unit: [Pa]) and ρ is the air density (unit: [kg / m 3 ]), and c is the speed of sound in air (units: [m / s]).

[0032] Next, the calculation unit 401 calculates the distance from the acoustic center position Om of the vehicle 100 to the detection position Pm i Distance to L i For example, the position Om of the acoustic center of the vehicle 100 is (x0, y0), and the predetermined detection position Pm i The position of (xm i ,ym i ), the calculation unit 401 calculates the distance from the position Om of the acoustic center to the predetermined detection position Pm based on the following formula f2: i Distance to L i Calculate the following.

[0033]

number

[0034] If the acoustic center of the vehicle 100 is the right front tire 101 of the vehicle 100 shown in FIG. 3, the calculation unit 401 sets the position Om(x0, y0) of the acoustic center to the position Pt1(1, 0.7) of the right front tire 101.

[0035] Next, the calculation unit 401 calculates the distance from the position Om of the acoustic center of the vehicle 100 to a predetermined detection position Pm i Distance to L i and the reference distance L0, based on the following formula f3, the distance attenuation B i (Step S12) Formula f3 is created on the assumption that sound spreads three-dimensionally and that the volume of sound decreases by 6 dB when the distance doubles.

[0036]

number

[0037] In equation f3, reference distance L0 is the distance from the acoustic center position Om to the nearest microphone device. For example, if the acoustic center position Om is set to the right front tire 101 of the vehicle 100, reference distance L0 is the distance from the acoustic center position Om to reference position P0. In this embodiment, reference position P0 is set to detection position Pm7 of microphone device M7.

[0038] Distance attenuation B i is the sound emitted from the acoustic center at the detection position Pm i The distance attenuation B in this embodiment indicates the amount of attenuation of the sound volume from the time the sound reaches the target. i is expressed as the amount of attenuation of sound volume relative to the reference distance L0, where the amount of attenuation of sound volume is set to 0 [dB].

[0039] Next, the calculation unit 401 calculates the detected position Pm i In the microphone device M i The detected sound volume P i and the distance attenuation B calculated by the above formula f3i Therefore, based on the following equation f4, the distance from the acoustic center of the vehicle 100 to a predetermined detection position Pm i Noise level A is generated toward i (unit: dB) is calculated (step S13).

[0040]

number

[0041] Furthermore, the calculation unit 401 calculates the noise level A calculated based on the formula f4. i Based on the following formula f5, the noise intensity D radiating from the acoustic center is calculated. i (Unit: W / m 2 ]) is calculated (step S14).

[0042]

number

[0043] The measurement result creation unit 402 calculates the distances between the acoustic center of the vehicle 100 and each of the detection positions Pm1 to Pm 13 Noise intensity D1~D radiated towards 13 Furthermore, the measurement result creating unit 402 creates a first noise map by mapping each of the detection positions Pm1 to Pm 13 Noise intensity I1~I 13 A second noise map is created by mapping the above.

[0044] The display control unit 403 displays the first noise map and the second noise map created by the measurement result creation unit 402 on the output unit 70.

[0045] (Example of operation of the exterior noise measuring device) Next, an example of the operation of the vehicle exterior noise measuring device 10 of this embodiment will be described.

[0046] When detecting noise from vehicle 100, as shown in FIG. 7, the user first places vehicle 100 on a chassis dynamometer so that sound radiating from a predetermined acoustic center of vehicle 100 can be detected (step S20). For example, when measuring noise radiated only from right front tire 101 of vehicle 100, only right front tire 101 needs to be rotated. Therefore, as shown in FIG. 8, left front wheel 102 (including the tire) is removed from vehicle 100, and the tip of suspension arm 110 is lifted with jack device 200 to keep vehicle 100 level, while only right front tire 101 is rotated. At this time, as shown in FIG. 8, a predetermined jig 500 is placed between the rotating part of left front wheel 102 after removal and roller 121 of chassis dynamometer 120, so that the rotating part of left front wheel 102 after removal does not come into contact with roller 121 while keeping vehicle 100 level. This makes it possible to measure only the noise emitted from the right front tire 101 by rotating only the right front tire 101 with drum drive.

[0047] Next, as shown in FIG. 7, an indoor pass-by test is performed to detect the respective detection positions Pm1 to Pm 13 Noise detection values ​​P1 to P 13 For example, after the vehicle 100 is positioned as shown in FIG. 3, the right front tire 101 of the vehicle 100 is rotated while the microphone devices M1 to M 13 The information acquisition unit 400 acquires the noise sounds at predetermined time intervals. 13 Noise detection values ​​P1 to P 13 Microphone devices M1 to M 13 The values ​​P1 to P2 shown in Figure 9 are obtained from 13 When the right front tire 101 is rotated, the microphone devices M1 to M 13 1 shows an example of the detected noise values ​​respectively.

[0048] Subsequently, as shown in FIG. 7, the calculation unit 401 executes the process of step S10 shown in FIG. 6 to calculate the detection positions Pm1 to Pm 13 Noise detection values ​​P1 to P 13 From the above formula f1, the detection positions Pm1 to Pm 13 Noise intensity I1~I 13 is calculated as shown in FIG. 9 (step S22).

[0049] Subsequently, as shown in FIG. 7, the calculation unit 401 executes the processes of steps S11 to S14 shown in FIG. 6 to calculate the detection positions Pm1 to Pm 13 The noise intensity D1 to D radiated from the acoustic center corresponds to 13 9 (step S23). 13 The distances L1 to L2 calculated by the calculation unit 401 during the calculation process are 13 , distance attenuation B1~B 13 , and noise levels A1 to A 13 is also illustrated.

[0050] 7, the user determines whether there are other parts for which noise is to be measured (step S24), and if there are other parts (step S24: YES), the process returns to step S20. For example, if noise radiated from the left front tire 102 of the vehicle 100 is to be further detected, the user makes a positive determination in the determination process of step S24 and returns to the process of step S20. In this case, the processes of steps S20 to S23 are performed again with the left front tire 102 of the vehicle 100 as the acoustic center, thereby detecting detection positions Pm1 to Pm2 when the left front tire 102 is the acoustic center. 13 Sound intensity I1~I 13 , and the noise intensity D1 to D radiated from the acoustic center 13 10 shows the microphone devices M1 to M measured when the tire 102 of the left front wheel of the vehicle 100 is the acoustic center. 13 Noise detection values ​​P1 to P 13 , each detection position Pm1 to Pm 13Noise intensity I1~I 13 , distance L1~L 13 , distance attenuation B1~B 13 , noise level A1~A 13 , and each detection position Pm1 to Pm from the acoustic center 13 Noise intensity D1 to D 13 This is an example of the above.

[0051] Next, as shown in FIG. 7, the user determines whether there are other parts where noise is to be measured (step S24). If there are no other parts (step S24: NO), the measurement result creation unit 402 calculates the noise level of each of the detection positions Pm1 to Pm2 from the acoustic center of the vehicle 100. 13 Noise intensity D1~D radiated towards 13 A first noise map Ms11 is created by mapping the above (step S25).

[0052] For example, from the acoustic center to each detection position Pm1 to Pm 13 Noise intensity D1 to D 13 9 and 10 are measured, the measurement result creation unit 402 creates a first noise map Ms11 as shown in Fig. 11. In the first noise map Ms11, the position Om of the first acoustic center 11 is set at the position Pt1 of the right front tire 101, and the position Om 12 is set at the position Pt2 of the left front tire 102. In addition, the first noise map Ms11 also includes the position Om 11 From each detection position Pm1 to Pm 13 Vector Va1~Va 13 Each vector Va1~Va 13 The direction of the arrow indicates the direction of the noise generated from the right front tire 101. 13 The length of the arrow is the position of the first acoustic center Om shown in Figure 9. 11 From each detection position Pm1 to Pm 13 Noise intensity D1 to D 13Furthermore, the first noise map Ms11 has a length corresponding to the position Om of the second acoustic center. 12 From each detection position Pm1 to Pm 13 Vectors Vb1 to Vb 13 Each vector Vb1 to Vb 13 The direction of the arrow indicates the direction of the noise generated from the left front tire 102. 13 The length of the arrow is the position of the second acoustic center Om shown in Figure 10. 12 From each detection position Pm1 to Pm 13 Noise intensity D1 to D 13 The length is set to correspond to the

[0053] The first noise map Ms11 contains vectors Va1 to Va 13 The vectors Vb1 to Vb2 are connected to each other in a predetermined noise area Aa. 13 Since a predetermined noise area Ab formed by connecting the respective tip ends of the noise areas Aa is included in the noise area Aa, the noise area Ab is not shown in the first noise map Ms11.

[0054] Next, as shown in FIG. 7, the measurement result creation unit 402 creates a measurement result for each of the detection positions Pm1 to Pm2 acquired by the information acquisition unit 400. 13 Noise intensity I1~I 13 A second noise map Ms12 is created by mapping the above (step S26).

[0055] For example, each of the detection positions Pm1 to Pm 13 Noise intensity I1~I 13 9 and 10 are measured, the measurement result creation unit 402 creates a second noise map Ms12 as shown in Fig. 12. In the second noise map Ms12, the position Om of the first acoustic center 11 is set at the position Pt1 of the right front tire 101, and the position Om 12 is set at the position Pt2 of the left front tire 102. In addition, the second noise map Ms12 includes the position Om 11From each detection position Pm1 to Pm 13 Vectors Vc1 to Vc 13 Each vector Vc1 to Vc 13 The length of the arrows is the length of each detection position Pm1 to Pm2 shown in FIGS. 13 Noise intensity I1~I 13 Furthermore, the second noise map Ms12 has a length corresponding to the position Om of the second acoustic center. 12 From each detection position Pm1 to Pm 13 Vectors Vd1 to Vd 13 Each vector Vd1 to Vd 13 The length of the arrows is the length of each detection position Pm1 to Pm2 shown in FIGS. 13 Noise intensity I1~I 13 The length is set to correspond to the

[0056] The second noise map Ms12 includes vectors Vc1 to Vc 13 The predetermined noise area Ac connecting the respective ends of the vectors Vd1 to Vd 13 The predetermined noise area Ad is formed by connecting the respective tips of the noise areas.

[0057] Next, as shown in FIG. 7, the display control unit 403 displays a screen including at least one of the first noise map Ms11 shown in FIG. 11 and the second noise map Ms12 shown in FIG. 12 on the output unit 70 based on the user's operation on the input unit 60 (step S27).

[0058] 13 and 14 respectively show the first noise map Ms21 and the second noise map Ms22 created by the measurement result creation unit 402 based on the measurement results when noise radiated from the tires 103, 104 of the right and left rear wheels of the vehicle 100 is detected.

[0059] (Hardware configuration of exterior noise measurement device) Next, with reference to FIG. 15, an example of the hardware configuration of a computer 800 when the vehicle exterior noise measuring device 10 is realized by a computer will be described.

[0060] As shown in FIG. 15, the computer 800 includes a processor 801, a storage device 802, a communication device 803, an input device 804, and an output device 805. The processor 801 is a CPU (Central Processing Unit) or a GPU (Graphical Processing Unit). The storage device 802 is configured, for example, by at least one of a memory, an HDD (Hard Disk Drive), and an SSD (Solid State Drive). The communication device 803 performs wired or wireless communication. The input device 804 is a device that accepts input operations and is configured, for example, by at least one of a keyboard, a touch panel, a mouse, and a microphone. The output device 805 is a device that outputs information and is configured, for example, by at least one of a display, a touch panel, and a speaker.

[0061] (Actions and Effects of the Vehicle Exterior Noise Measuring Device of the Present Embodiment) As explained above, the vehicle exterior noise measuring device 10 of this embodiment measures noise generated from tires 101-104 (objects) of a vehicle 100 placed indoors. The vehicle exterior noise measuring device 10 comprises an information acquisition unit 400, a calculation unit 401, a measurement result creation unit 402, and a display control unit 403. The information acquisition unit 400 acquires a plurality of detection positions Pm1-Pm2 set at predetermined intervals in the area around the tires 101-104 of the vehicle 100. 13 A plurality of microphone devices M1 to M are arranged in each of the 13 (Sound detection unit) detects multiple detection positions Pm1 to Pm 13 The sound volume at each of P1 to P 13 The calculation unit 401 acquires information on the position of the acoustic center Om 11 ,Om 12 The position of the acoustic center is Om 11 ,Om 12 From the detection position Pm iDistance to L i and microphone device M i The detected sound volume P i and the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i The noise intensity D radiated in the direction i At multiple detection positions Pm1 to Pm 13 The measurement result creation unit 402 calculates the position of each of the plurality of detection positions Pm1 to Pm 13 The noise intensities D1 to D 13 The display control unit 403 creates a first noise map Ms11 by mapping the noise levels and the directions of the noises. The display control unit 403 displays the first noise map Ms11 on the screen.

[0062] According to this configuration, the user can visually recognize the intensity of the noise generated from the tires 101, 102 of the vehicle 100 by looking at the first noise map Ms11, thereby improving convenience.

[0063] The calculation unit 401 calculates the position Om of the acoustic center. 11 ,Om 12 The sound emitted from the center of the sound field is detected at a predetermined reference position P0. 11 ,Om 12 The sound emitted from the detection position Pm i Distance attenuation B, which is the attenuation of the sound volume when detecting i The calculation unit 401 also calculates the microphone device M i The detected sound volume P i distance attenuation B i By correcting it, the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i The noise intensity D radiated in the direction i Calculate the following.

[0064] According to this configuration, the position of the acoustic center Om 11 ,Om 12From the detection position Pm i The noise intensity D radiated in the direction i can be calculated with high precision.

[0065] In the first noise map Ms11, the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i The noise intensity radiated in the direction of the vector Va i ,Vb i The acoustic center position is expressed as the length Om 11 ,Om 12 From the detection position Pm i The direction of the sound emitted towards the vector Va i ,Vb i It is represented in the direction of.

[0066] According to this configuration, the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i The intensity and direction of the noise radiated in the direction towards the vector Va i ,Vb i The length and direction of the

[0067] The measurement result creation unit 402 creates a first noise map Ms11 by adding a plurality of vectors Va1 to Va 13 The predetermined noise area Aa is further displayed by connecting the respective tip ends of the above.

[0068] According to this configuration, the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i This makes it easier to grasp the strength and direction of noise radiated in the direction toward the target.

[0069] The measurement result creation unit 402 creates a first noise map Ms11 by calculating the position Om of the acoustic center. 11 is the right front tire 101 (first tire) of the vehicle 100, and the noise map corresponding to the position Om 12is the left front tire 102 (second tire) of the vehicle 100, and a noise map corresponding to the left front tire 102 (second tire) of the vehicle 100 is synthesized to create a synthesized noise map.

[0070] With this configuration, the user can recognize the noises emitted from the right front tire 101 and the left front tire 102 of the vehicle 100 simply by checking the first noise map Ms11, thereby further improving convenience.

[0071] The measurement result creation unit 402 detects a plurality of detection positions Pm1 to Pm 13 The noise intensity at each of I1 to I 13 and the position of the acoustic center Om 11 ,Om 12 From the detection position Pm i The display control unit 403 then creates a second noise map Ms12 that maps the noise levels in relation to the direction of travel. The display control unit 403 displays the second noise map Ms12 on the screen.

[0072] According to this configuration, the user can determine the location of the plurality of detection positions Pm1 to Pm by looking at the second noise map Ms12. 13 The noise intensity at each of I1 to I 13 This allows the user to visually recognize the information, further improving convenience.

[0073] (First Modification) Next, a first modified example of the vehicle exterior noise measuring device 10 of the embodiment will be described.

[0074] The vehicle exterior noise measuring device 10 of this modified example measures noise generated when the right front tire 101 and the left front tire 102 of the vehicle 100 are simultaneously rotated, that is, noise generated when the sound source is the right front tire 101 and the left front tire 102. In this case, the position of the acoustic center is the midpoint Pt between the right front tire 101 and the left front tire 102 shown in FIG. 12 16 and 17 show the position of the acoustic center Om 13 is the position Pt 1210 shows the first noise map Ms31 and the second noise map Ms32 when the value is set as follows:

[0075] The vehicle exterior noise measuring device 10 of this modified example may also measure noise generated when the right rear tire 103 and the left rear tire 104 of the vehicle 100 are simultaneously rotated, i.e., noise generated when the sound sources are the right rear tire 103 and the left rear tire 104, and create a corresponding first noise map Ms31 and second noise map Ms32. In this case, the position of the acoustic center is the midpoint Pt between the right rear tire 103 and the left rear tire 104 shown in FIG. 34 is set to

[0076] (Second Modification) Next, a second modification of the vehicle exterior noise measuring device 10 of the embodiment will be described.

[0077] The vehicle exterior noise measuring device 10 of this modified example measures noise by rotating and driving the wheels in the following order: "four wheels," "two front wheels," "left front wheel," "right front wheel," "two rear wheels," "left rear wheel," "right rear wheel," and "four wheels." The rotation of the "four wheels," "two front wheels," and "two rear wheels" is controlled by the chassis drum. The rotation of the "left front wheel," "right front wheel," "left rear wheel," and "right rear wheel" is controlled in the same way as in the above embodiment.

[0078] With this configuration, it is possible to obtain a first noise map and a second noise map corresponding to the rotational drive of each of the four wheels, the two front wheels, the left front wheel, the right front wheel, the two rear wheels, the left rear wheel, and the right rear wheel, thereby making it possible to analyze the noise generated from each tire 101 to 104 of the vehicle 100 with greater accuracy.

[0079] (Third Modification) Next, a third modification of the exterior noise measuring device 10 of the embodiment will be described.

[0080] The measurement result creation unit 402 of this modified example calculates the noise levels P obtained when the "left front wheel", "right front wheel", "left rear wheel", "right rear wheel", and "four wheels" are rotated. i A graph G is created that allows the comparison of the noise levels of the tires 101-104 of each wheel. FIG. 18 shows an example of the graph G. The display control unit 403 displays a screen including the graph G created by the measurement result creation unit 402 on the output unit 70. In FIG. 18, the horizontal axis represents the position in the vehicle longitudinal direction FB, and the vertical axis represents the noise level of the tires 101-104 of each wheel, and the relationship between these is shown in the graph. In FIG. 18, the solid line Ls1 indicates the noise level when all of the tires 101-104 of each wheel are rotated, the dashed-dotted line Ls2 indicates the noise level when only the tire 101 of the right front wheel is rotated, and the dashed-two-dotted line Ls3 indicates the noise level when only the tire 102 of the left front wheel is rotated. The short dashed line Ls4 indicates the noise level when only the tire 103 of the right rear wheel is rotated, and the long dashed line Ls5 indicates the noise level when only the tire 104 of the left rear wheel is rotated.

[0081] This configuration makes it possible to identify the tire that is likely to generate noise among the tires 101 to 104 of the vehicle 100, and also to ascertain the direction from which the noise is being generated, thereby further improving convenience.

[0082] <Other embodiments> The present disclosure is not limited to the above specific examples.

[0083] For example, in the first noise map Ms11 shown in FIG. 11, the position Om 11 Vectors Va1~Va corresponding to 13 and display only the noise area Aa, or the position of the second acoustic center Om 12 Vectors Vb1 to Vb corresponding to 13 Similarly, the second noise map Ms12 shown in FIG. 12 shows the position Om of the first acoustic center. 11 Vectors Vc1 to Vc corresponding to 13and display only the noise area Ac, or the position of the second acoustic center Om 12 Vectors Vd1 to Vd corresponding to 13 Only the noise area Ad may be displayed.

[0084] The arrangement of the microphone devices can be changed as appropriate. For example, as shown in FIG. 19, a plurality of microphone devices M1 to M 15 may be arranged in a U-shape.

[0085] For example, the object for measuring noise is not limited to the tires 101 to 104 of the vehicle 100, but any object that generates noise, such as tires of a motorcycle, can be used.

[0086] Design modifications made by a person skilled in the art to the above specific examples as appropriate are also included within the scope of the present disclosure as long as they comprise the features of the present disclosure. The elements of each of the above specific examples, as well as their arrangement, conditions, shape, etc., are not limited to those exemplified and can be modified as appropriate. The elements of each of the above specific examples can be combined as appropriate as long as no technical contradictions arise. [Explanation of symbols]

[0087] M1~M 15 : microphone device (sound detection unit), 10: vehicle exterior noise measuring device, 101-104: tires (objects), 400: information acquisition unit, 401: calculation unit, 402: measurement result creation unit, 403: display control unit, 800: computer.

Claims

1. An exterior noise measuring device for measuring noise generated from an object placed indoors, an information acquisition unit that acquires information on the volume of sound at each of a plurality of detection positions from a plurality of sound detection units that are respectively arranged at a plurality of detection positions set at predetermined intervals in an area around the object; a calculation unit that calculates, for each of the plurality of detection positions, the intensity of noise radiated in a direction from the acoustic center toward the detection position based on the distance from the predetermined acoustic center of the object to the detection position and the magnitude of the sound detected by the sound detection unit; and a measurement result creation unit that creates a first noise map that associates the noise intensities corresponding to the plurality of detection positions calculated by the calculation unit with the directions of the noise; and a display control unit that displays the first noise map. Exterior noise measuring device.

2. The calculation unit calculating a distance attenuation amount, which is the amount of sound attenuation when the sound emitted from the acoustic center is detected at the detection position, based on the distance from the acoustic center to the detection position; The intensity of the noise radiated in the direction from the acoustic center toward the detection position is calculated by correcting the magnitude of the sound detected by the sound detection unit using the distance attenuation amount.

2. The vehicle exterior noise measuring device according to claim 1.

3. In the first noise map, the intensity of the noise radiated in the direction from the acoustic center toward the detection position is represented by the length of a vector, and the direction of the noise radiated in the direction from the acoustic center toward the detection position is represented by the direction of the arrow of the vector.

2. The vehicle exterior noise measuring device according to claim 1.

4. The measurement result creation unit further displays a predetermined noise area created by connecting the tips of a plurality of vectors on the first noise map.

4. The vehicle exterior noise measuring device according to claim 3.

5. the object is a tire of a vehicle, The acoustic center is set at the tire of the vehicle.

2. The vehicle exterior noise measuring device according to claim 1.

6. the object is a first tire and a second tire of a vehicle, the acoustic centers are set at first and second tires of the vehicle, respectively; The measurement result creation unit creates, as the first noise map, a composite noise map by combining a noise map corresponding to when the acoustic center is the first tire and a noise map corresponding to when the acoustic center is the second tire.

2. The vehicle exterior noise measuring device according to claim 1.

7. the object is a tire of a vehicle, The acoustic center is set at a midpoint between a plurality of tires provided on the vehicle.

2. The vehicle exterior noise measuring device according to claim 1.

8. the measurement result creation unit further creates a second noise map that associates the noise intensity at each of the plurality of detection positions with the direction from the acoustic center toward the detection position; The display control unit further displays the second noise map.

2. The vehicle exterior noise measuring device according to claim 1.

9. 1. A vehicle exterior noise measurement method for measuring noise generated from an object placed indoors by a computer, comprising: The computer acquiring information on the volume of sound at each of a plurality of detection positions from a plurality of sound detection units arranged at a plurality of detection positions set at predetermined intervals in an area around the object; calculating, for each of the plurality of detection positions, the intensity of noise radiated in a direction from the acoustic center toward the detection position based on the distance from the predetermined acoustic center of the object to the detection position and the magnitude of the sound detected by the sound detection unit; creating a first noise map that associates the intensity of the noise corresponding to each of the plurality of detection positions with the direction of the noise; Display the first noise map Methods for measuring exterior vehicle noise.

10. A program for causing a computer to measure noise generated from an object placed indoors, The computer, acquiring information on the volume of sound at each of a plurality of detection positions from a plurality of sound detection units arranged at a plurality of detection positions set at predetermined intervals in an area around the target; calculating, for each of the plurality of detection positions, the intensity of noise radiated in a direction from the acoustic center toward the detection position based on the distance from the predetermined acoustic center of the object to the detection position and the magnitude of the sound detected by the sound detection unit; creating a first noise map that maps the intensity of the noise corresponding to each of the plurality of detection positions and the direction of the noise; Displaying the first noise map program.

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