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

Abstract

Provided is an outdoor noise measurement device capable of improving convenience. 【Solution means】The outdoor noise measurement device 10 includes 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 information on the loudness of sound at each of a plurality of detection positions. The calculation unit 401 calculates the intensity of noise radiated in the direction from each tire of the vehicle toward the detection position for each of the plurality of detection positions. The measurement result creation unit 402 creates a first noise map in which the intensity of noise corresponding to each of the plurality of detection positions calculated by the calculation unit 401 and the direction of the noise are associated and mapped. The display control unit 403 displays the first noise map.

Description

Technical Field

[0001] The present invention relates to an outdoor noise measurement device, an outdoor noise measurement method, and a program.

Background Art

[0002] Conventionally, there is a noise test method described in Patent Document 1 below. In this noise test method, when the vehicle reaches a predetermined position, the noise of the vehicle is measured.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method described in Patent Document 1, there is a situation where it is difficult for the user to grasp the noise of the vehicle, which is a factor reducing convenience.

[0005] The present invention has been made in view of such a situation, and an object thereof is to provide an outdoor noise measurement device, an outdoor noise measurement method, and a program capable of improving convenience.

Means for Solving the Problems

[0006] The vehicle exterior noise measurement device that solves the above problems is a vehicle exterior noise measurement device that measures the 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 information on the magnitude of the sound at each of a plurality of detection positions respectively arranged at a plurality of detection positions set at predetermined intervals in the area around the object. The calculation unit calculates, for each of the plurality of detection positions, the intensity of the noise radiated in the direction from the acoustic center to 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. The measurement result creation unit 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 and the direction of the noise are associated and mapped. The display control unit displays the first noise map.

[0007] The vehicle exterior noise measurement method that solves the above problems is a vehicle exterior noise measurement method for a computer to measure the noise generated from an object placed indoors. The computer acquires information on the magnitude of the sound at each of a plurality of detection positions respectively arranged at a plurality of detection positions set at predetermined intervals in the area around the object, calculates, for each of the plurality of detection positions, the intensity of the noise radiated in the direction from the acoustic center to 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, creates a first noise map in which the intensity of the noise corresponding to each of the plurality of detection positions and the direction of the noise are associated and mapped, and displays the first noise map.

[0008] The program for solving the above problems is a program for causing a computer to measure the noise generated from an object placed indoors. The program causes the computer to obtain information on the loudness of the sound at each of a plurality of detection positions set at predetermined intervals in the area around the object from a plurality of sound detection units respectively arranged at the plurality of detection positions, and based on the distance from a predetermined acoustic center of the object to the detection position and the loudness of the sound detected by the sound detection unit, calculates the intensity of the noise radiated in the direction from the acoustic center to the detection position for each of the plurality of detection positions, creates a first noise map in which the intensity of the noise corresponding to each of the plurality of detection positions and the direction of the noise are associated and mapped, and displays 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, so that the convenience can be improved.

Effect of the Invention

[0010] According to the vehicle exterior noise measurement device, vehicle exterior noise measurement method, and program of the present invention, it is possible to improve the convenience.

Brief Description of the Drawings

[0011]

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Mode for Carrying Out the Invention

[0012] Hereinafter, an embodiment of an outdoor noise measurement device, an outdoor noise measurement method, and a program will be described with reference to the drawings. To facilitate understanding of the description, the same reference numerals are given to the same components in each drawing as much as possible, and redundant descriptions are omitted.

[0013] <Embodiment> First, an overview of the outdoor noise measurement device according to this embodiment will be described.

[0014] (Overview of Outdoor Noise Measurement Device) The outdoor noise measurement device 10 according to this embodiment shown in FIG. 1 is a device used for a so-called indoor pass-by test that measures the passing noise of a vehicle indoors. In the indoor pass-by test, for example, a chassis dynamometer device is installed in a semi-anechoic chamber, and a plurality of microphone devices are arranged in a row parallel to the traveling direction of the vehicle on at least one of the right and left sides of the vehicle. Then, the vehicle fixed on the chassis dynamometer device is driven, and at this time, the sound emitted from the vehicle is measured by the plurality of microphone devices respectively, and simulation is performed. At this time, the output signals of the respective microphone devices are processed based on the vehicle speed and the like, and a measurement result of the outdoor noise including Doppler correction and the like is obtained.

[0015] (Schematic Configuration of Outdoor Noise Measurement Device) Next, the specific configuration of the outdoor noise measurement device 10 will be described.

[0016] As shown in FIG. 1, the vehicle exterior noise measuring device 10 is arranged in the semi-anechoic chamber Sa. As shown in FIG. 2, a chassis dynamometer device 120 is arranged on the floor surface 130 of the semi-anechoic chamber Sa. A vehicle 100 is fixed on the chassis dynamometer device 120. The chassis dynamometer device 120 includes, for example, a roller 121 on which the tire 100a of the vehicle 100 is placed. In the chassis dynamometer device 120, the state where the vehicle 100 is running is pseudo-reproduced by the rotation of the tire 100a of the vehicle 100 on the roller 121. At this time, for example, by appropriately changing the load of the roller 121, it is possible to bring the driving conditions of the vehicle 100 closer to the actual driving conditions. The vehicle exterior noise measuring device 10 of the present embodiment is set at a position where the sound from the tire 100a of the vehicle 100, which is an object generating noise, can be measured.

[0017] As shown in FIG. 1, the vehicle exterior noise measuring device 10 includes a plurality of microphone devices M1 to M 13 , a control unit 40, a storage unit 50, an input unit 60, and an output unit 70.

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

[0019] In FIG. 3, the direction indicated by the arrow RH represents the right direction of the vehicle 100, and the direction indicated by the arrow LH represents the left direction of the vehicle 100. Also, the direction indicated by the arrow FR represents the front direction of the vehicle 100, and the direction indicated by the arrow BA represents the rear direction of the vehicle 100. Further, the direction indicated by the arrow RL represents the left-right direction of the vehicle 100, and the direction indicated by the arrow FB represents the front-rear direction of the vehicle 100.

[0020] Also, hereinafter, as shown in FIG. 3, each position when the vehicle 100 is viewed from above is represented by the respective positions (x, y) on the x-axis and the y-axis. As shown in FIG. 3, the origin O(0, 0) of the x-axis and the y-axis is set at a position in front of the vehicle 100. The x-axis is a direction parallel to the vehicle front-rear direction FB, and is set such that the vehicle rear direction BA is the positive direction and the vehicle front direction FR is the negative direction. The y-axis is a direction parallel to the vehicle left-right direction RL, and is set such that the vehicle right direction RH is the positive direction and the vehicle left direction LH is the negative direction. Hereinafter, the coordinate system of the x-axis and the y-axis is referred to as the xy coordinate system. Also, the x value and the y value of the position (x, y) each represent the distance (unit: [m]) from the origin O. For example, as shown in FIG. 3, the position Pt1 of the tire 101 of the right front wheel of the vehicle 100 is represented by (1, 0.7). In this case, it indicates that the tire 101 of the right front wheel of the vehicle 100 is arranged at a position shifted 1 m in the vehicle rear direction BA and 0.7 m in the vehicle right direction RH from the origin O. The respective positions Pt2 to Pt4 of the tire 102 of the left front wheel, the tire 103 of the right rear wheel, and the tire 104 of the left rear wheel of the vehicle 100 are also represented by positions in the xy coordinate system in the same manner.

[0021] As shown in FIG. 3, the microphone devices M1 to M 13 are respectively arranged at the positions Pm1 to Pm 13 As shown in FIG. 4, each detection position Pm1 to Pm 13 is set at a position 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] The microphone devices M1 to M 13 detect the magnitude of the noise (unit: decibel [dB]) at the detection positions Pm1 to Pm 13 respectively, and transmit output signals corresponding to the detected magnitude of the noise to the control unit 40 respectively. In the present embodiment, the microphone devices M1 to M 13is an example of a sound detection unit. In this embodiment, the sound pressure level Lp (unit: [dB]) is used as the sound volume, but the sound pressure (unit: [Pa]) may also be used.

[0023] The storage unit 50 shown in FIG. 1 stores various data possessed by the vehicle exterior noise measurement device 10. For example, the storage unit 50 stores various programs for operating the vehicle exterior noise measurement device 10.

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

[0025] The control unit 40 controls the vehicle exterior noise measurement device 10. For example, the control unit 40 includes an information acquisition unit 400, an arithmetic unit 401, a measurement result creation unit 402, and a display control unit 403 as a functional configuration realized by executing the programs stored in the storage unit 50.

[0026] The information acquisition unit 400 is based on the signals respectively output from the microphone devices M1 to M 13 to acquire the magnitudes P1 to P 13 of the noise at a plurality of detection positions Pm1 to Pm 13 respectively. Hereinafter, the magnitudes P1 to P 13 of the noise acquired by the information acquisition unit 400 are also referred to as "noise detection values P1 to P 13 ". For example, the information acquisition unit 400 acquires the noise detection values at a predetermined time interval in this order from the microphone devices M1 to M 13 . As a result, the sound detection positions are Pm1 to Pm 13It will change in the order of. That is, the sound detection position will change relatively from the detection position Pm1 towards the rear direction BA of the vehicle. As a result, it is possible to pseudo-reproduce a situation where the vehicle 100 passes through a fixed sound detection position. By changing the predetermined time interval, it is also possible to arbitrarily change the pseudo-travel speed of the vehicle 100.

[0027] In addition, for the microphone device M i the detected values P of the noise respectively acquired by i if used as they are, those detected values P will be connected stepwise as shown in Fig. 5(A). Here, 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 correct the detected values P i , P i+1 , P i+2 so as to obtain a continuous curve of the detected value P as shown in Fig. 5(C).

[0028] The calculation unit 401 calculates the intensity of the noise radiated in the direction from the acoustic center to each of the detection positions Pm1 to Pm 13 based on the detected values P1 to P 13 of the noise at each of the plurality of detection positions Pm1 to Pm 13 detected by the information acquisition unit 400. The position Om of the acoustic center is set to the position of the sound source, for example, when there is one sound source. For example, when the sound source is set to the tire 101 of the right front wheel of the vehicle 100, the position Om of the acoustic center is set to the position of the tire 101 of the right front wheel. Also, when the sound sources are the tire 101 of the right front wheel and the tire 102 of the left front wheel of the vehicle 100, the acoustic center is set to the position Pt 12 in the middle of those positions Pt1 and Pt2 as shown in Fig. 3. Also, when the sound sources are the tire 103 of the right rear wheel and the tire 104 of the left rear wheel of the vehicle 100, the acoustic center is set to the position Pt 34 in the middle of those positions Pt3 and Pt4.

[0029] FIG. 6 shows the procedure of the arithmetic processing performed by the arithmetic unit 401. As shown in FIG. 6, the arithmetic unit 401 first determines a predetermined detection position Pm i of the microphone device M i and calculates the detected value P of the noise detected by i the microphone device M at the detection position Pm i to calculate the sound intensity I i (acoustic intensity, unit: [W / m 2 ) based on the following formula f1 (step S10).

[0030]

Equation

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

[0032] Next, the arithmetic unit 401 calculates the distance L i from the position Om of the acoustic center of the vehicle 100 to the detection position Pm i (step S11). For example, when the position Om of the acoustic center of the vehicle 100 is (x0, y0) and the position of the predetermined detection position Pm i is (xm i , ym i ), the arithmetic unit 401 calculates the distance L i from the position Om of the acoustic center to the predetermined detection position Pm i based on the following formula f2.

[0033]

Equation

[0034] In addition, when the acoustic center of the vehicle 100 is the tire 101 of the right front wheel 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 tire 101 of the right front wheel.

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

[0036]

Equation

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

[0038] The distance attenuation amount B i indicates the attenuation amount of the sound intensity when the sound radiated from the acoustic center reaches the detection position Pm i . The distance attenuation amount B i of this embodiment is expressed as the attenuation amount of the sound intensity with reference to the case where the attenuation amount of the sound intensity when the sound radiated from the acoustic center reaches the reference distance L0 is 0 [dB].

[0039] Subsequently, the calculation unit 401 calculates the sound intensity P i detected by the microphone device M i at the detection position Pm i and the distance attenuation amount B calculated by the above formula f3i Therefore, based on the following formula f4, the noise level A i generated towards the predetermined detection position Pm i (unit: [dB]) is calculated (step S13).

[0040]

Number

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

[0042]

Number

[0043] The measurement result creation unit 402 creates a first noise map by mapping the intensities D1 to D 13 of the noise radiated from the acoustic center of the vehicle 100 towards each detection position Pm1 to Pm 13 calculated by the calculation unit 401. Also, the measurement result creation unit 402 creates a second noise map by mapping the intensities I1 to I 13 of the noise at each detection position Pm1 to Pm 13 acquired by the information acquisition unit 400.

[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] (Operation example of the vehicle exterior noise measurement device) Next, an operation example of the vehicle exterior noise measurement device 10 of the present embodiment will be described.

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

[0047] Next, as shown in FIG. 7, an indoor pass-by test is performed to detect each of the 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 In this way, the information acquisition unit 400 acquires the noise sounds at each of the detection positions Pm1 to Pm 13 Noise detection values ​​P1 to P 13 Microphone device M1~M 13 The points P1 to P2 shown in FIG. 13 When the right front tire 101 is rotated, the microphone devices M1 to M 13 4 shows an example of the detection values ​​of noise detected by each of the above.

[0048] Subsequently, as shown in FIG. 7, the arithmetic unit 401 executes the process of step S10 shown in FIG. 6, and thereby, from the noise detection values P1 to P of each detection position Pm1 to Pm 13 the noise intensities I1 to I of the detection positions Pm1 to Pm 13 are calculated using the above formula f1 (step S22) as shown in FIG. 9. 13 13

[0049] Subsequently, as shown in FIG. 7, the arithmetic unit 401 executes the processes of steps S11 to S14 shown in FIG. 6, and thereby calculates the intensities D1 to D of the noise radiated from the acoustic center corresponding to each detection position Pm1 to Pm 13 respectively as shown in FIG. 9 (step S23). FIG. 9 shows the distances L1 to L, the distance attenuation amounts B1 to B, and the noise levels A1 to A calculated by the arithmetic unit 401 in the calculation process of the noise intensities D1 to D 13 13 13 13 13 which are shown together.

[0050] Subsequently, as shown in FIG. 7, the user determines whether there are other parts where noise is measured (step S24). If there are other parts (step S24: YES), the process returns to step S20. For example, when further detecting the noise radiated from the tire 102 of the left front wheel of the vehicle 100, the user makes an affirmative determination in the determination process of step S24 and returns to the process of step S20. In this case, by performing the processes of steps S20 to S23 again with the tire 102 of the left front wheel of the vehicle 100 as the acoustic center, the sound intensities I1 to I of the detection positions Pm1 to Pm 13 and the intensities D1 to D of the noise radiated from the acoustic center are calculated. FIG. 10 shows the noise detection values P1 to P of the microphone devices M1 to M measured when the tire 102 of the left front wheel of the vehicle 100 is the acoustic center, and the detection positions Pm1 to Pm 13 13 13 13 13 ​​​​​​​​​​The noise intensities I1 to I 13 , the distances L1 to L 13 , the distance attenuation amounts B1 to B 13 , the noise levels A1 to A 13 , and the noise intensities D1 to D 13 radiated from the acoustic center to each detection position Pm1 to Pm 13 are shown as an example.

[0051] Subsequently, as shown in FIG. 7, the user determines whether there are other parts where noise is measured (step S24). If there are no other parts (step S24: NO), the measurement result creation unit 402 determines the noise intensities D1 to D 13 radiated from the acoustic center of the vehicle 100 toward each detection position Pm1 to Pm 13 and creates a first noise map Ms11 in which they are mapped (step S25).

[0052] For example, when data as shown in FIGS. 9 and 10 are measured as the noise intensities D1 to D 13 radiated from the acoustic center to each detection position Pm1 to Pm 13 , 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 11 of the first acoustic center is set to the position Pt1 of the right front wheel tire 101, and the position Om 12 of the second acoustic center is set to the position Pt2 of the left front wheel tire 102. Further, in the first noise map Ms11, vectors Va1 to Va 11 extending from the position Om 13 of the first acoustic center to each detection position Pm1 to Pm 13 are included. The arrow directions of the respective vectors Va1 to Va 13 indicate the directions of the noise generated from the right front wheel tire 101. The arrow lengths of the respective vectors Va1 to Va 13 are the noise intensities D1 to D 11 radiated from the position Om 13 of the first acoustic center shown in FIG. 9 to each detection position Pm1 to Pm 13is set to a length corresponding thereto. Further, in the first noise map Ms11, the position Om of the second acoustic center 12 to each detection position Pm1 to Pm 13 extends vectors Vb1 to Vb 13 is included. The arrow directions of the respective vectors Vb1 to Vb 13 indicate the direction of the noise generated from the tire 102 of the left front wheel. The arrow lengths of the respective vectors Vb1 to Vb 13 are set to lengths corresponding to the intensities D1 to D of the noise radiated from the position Om of the second acoustic center shown in FIG. 10 12 to each detection position Pm1 to Pm 13 13 is set to a length corresponding thereto.

[0053] The first noise map Ms11 includes a predetermined noise area Aa connecting the tip ends of the respective vectors Va1 to Va 13 . Note that since a predetermined noise area Ab connecting the tip ends of the respective vectors Vb1 to Vb 13 is included in the noise area Aa, the illustration of the noise area Ab is omitted in the first noise map Ms11.

[0054] Subsequently, as shown in FIG. 7, the measurement result creation unit 402 creates a second noise map Ms12 in which the intensities I1 to I of the noise at each detection position Pm1 to Pm 13 acquired by the information acquisition unit 400 are mapped (step S26). 13

[0055] For example, when data as shown in FIGS. 9 and 10 are measured as the intensities I1 to I of the noise at each detection position Pm1 to Pm 13 respectively, 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 13 is set to the position Pt1 of the tire 101 of the right front wheel, and the position Om of the second acoustic center 11 is set to the position Pt2 of the tire 102 of the left front wheel. Further, in the second noise map Ms12, the position Om of the first acoustic center 12 is set to the position Pt1 of the tire 101 of the right front wheel, and the position Om of the second acoustic center 11 ​from each detection position Pm1 to Pm 13 vectors Vc1 to Vc extending to 13 are included. Each of the vectors Vc1 to Vc 13 has an arrow length set to a length corresponding to the noise intensities I1 to I 13 at each detection position Pm1 to Pm shown in FIGS. 9 and 10. Further, in the second noise map Ms12, from the position Om of the second acoustic center 13 to each detection position Pm1 to Pm 12 vectors Vd1 to Vd extending to 13 are included. Each of the vectors Vd1 to Vd 13 has an arrow length set to a length corresponding to the noise intensities I1 to I 13 at each detection position Pm1 to Pm shown in FIGS. 9 and 10. 13 13

[0056] The second noise map Ms12 includes a predetermined noise area Ac formed by connecting the tip ends of the vectors Vc1 to Vc 13 and a predetermined noise area Ad formed by connecting the tip ends of the vectors Vd1 to Vd 13 .

[0057] Subsequently, as shown in FIG. 7, the display control unit 403 outputs, based on a user operation on the input unit 60, 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 to the output unit 70 (step S27).

[0058] Note that FIGS. 13 and 14 respectively show a first noise map Ms21 and a second noise map Ms22 created by the measurement result creation unit 402 based on measurement results when detecting noise radiated from each of the right rear tire 103 and the left rear tire 104 of the vehicle 100.

[0059] (Hardware Configuration of the Vehicle Exterior Noise Measuring Device) Next, referring to FIG. 15, an example of the hardware configuration of a computer 800 when the vehicle exterior noise measurement device 10 is implemented 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, an output device 805, and the like. The processor 801 is a CPU (Central Processing Unit), a GPU (Graphical Processing Unit), or the like. The storage device 802 is composed of at least one of, for example, a memory, an HDD (Hard Disk Drive), and an SSD (Solid State Drive). The communication device 803 performs wired communication or wireless communication. The input device 804 is a device that receives an input operation and is composed of at least one of, for example, a keyboard, a touch panel, a mouse, and a microphone. The output device 805 is a device that outputs information and is composed of at least one of, for example, a display, a touch panel, and a speaker.

[0061] (Operation and Effect of the Vehicle Exterior Noise Measurement Device of the Present Embodiment) As described above, the vehicle exterior noise measurement device 10 of the present embodiment measures the noise generated from the tires 101 to 104 (objects) of the vehicle 100 arranged indoors. The vehicle exterior noise measurement device 10 includes an information acquisition unit 400, an arithmetic unit 401, a measurement result creation unit 402, and a display control unit 403. The information acquisition unit 400 acquires information on the sound levels P1 to P at a plurality of detection positions Pm1 to Pm set at predetermined intervals in the regions around the tires 101 to 104 of the vehicle 100. 13 respectively arranged at each of 13 (sound detection unit) a plurality of microphone devices M1 to M 13 at each of the plurality of detection positions Pm1 to Pm 13 The arithmetic unit 401, for example, takes the tires 101 and 102 of the vehicle 100 as the positions Om 11 , Om 12 of the acoustic centers, and from the positions Om 11 , Om 12 of the acoustic centers to the detection position Pm iDistance to L i and microphone device M i The detected sound volume P i Based on this, the position of the acoustic center Om 11 ,Om 12 From 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 multiple detection positions Pm1 to Pm 13 The noise intensities D1 to D 13 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 Based on the case where the sound emitted from is detected at a predetermined reference position P0, the position of the acoustic center Om 11 ,Om 12 The sound emitted from the detection position Pm i Distance attenuation B is the amount of attenuation in 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 the position of the acoustic center Om 11 ,Om 12 From 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 intensity D of the noise radiated in the direction toward i can be accurately calculated.

[0065] In the first noise map Ms11, the position Om of the acoustic center 11 , Om 12 from the detection position Pm i the intensity of the noise radiated in the direction toward is the vector Va i , Vb i represented by the length of, and the position Om of the acoustic center 11 , Om 12 from the detection position Pm i the direction of the sound radiated in the direction toward is the vector Va i , Vb i represented by the direction of.

[0066] According to this configuration, the intensity and direction of the noise radiated in the direction from the position Om of the acoustic center 11 , Om 12 to the detection position Pm i can be easily grasped by the length and direction of the vector Va i , Vb i of.

[0067] The measurement result creation unit 402 further displays a predetermined noise area Aa obtained by connecting the tip ends of a plurality of vectors Va1 to Va 13 to the first noise map Ms11.

[0068] According to this configuration, the intensity and direction of the noise radiated in the direction from the position Om of the acoustic center 11 , Om 12 to the detection position Pm i can be more easily grasped.

[0069] The measurement result creation unit 402 uses, as the first noise map Ms11, the noise map corresponding to the case where the position Om of the acoustic center 11 is the tire 101 (first tire) of the right front wheel of the vehicle 100, and the position Om of the acoustic center 12Create a composite noise map by synthesizing the noise map corresponding to when it is the tire 102 (second tire) of the left front wheel of the vehicle 100.

[0070] According to this configuration, the user can recognize the noises radiated from the tire 101 of the right front wheel and the tire 102 of the left front wheel of the vehicle 100 just by checking the first noise map Ms11, so that the convenience can be further improved.

[0071] The measurement result creation unit 402 further creates a second noise map Ms12 by mapping the noise intensity I1 to I at each of the plurality of detection positions Pm1 to Pm 13 associated with the direction from the position Om 13 of the acoustic center to the detection position Pm 11 , Om 12 to the detection position Pm i . The display control unit 403 displays the second noise map Ms12 on the screen.

[0072] According to this configuration, the user can visually recognize the noise intensity I1 to I at each of the plurality of detection positions Pm1 to Pm 13 by looking at the second noise map Ms12, so that the convenience can be further improved. 13

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

[0074] The vehicle exterior noise measurement device 10 of this modification example measures the noise generated when the tire 101 of the right front wheel and the tire 102 of the left front wheel of the vehicle 100 are simultaneously rotationally driven, that is, the noise generated when the sound sources are the tire 101 of the right front wheel and the tire 102 of the left front wheel. In this case, the position of the acoustic center is set to the position Pt 12 in the middle between the tire 101 of the right front wheel and the tire 102 shown in FIG. 3. FIGS. 16 and 17 show that the position Om 13 of the acoustic center is the position Pt 12It shows the first noise map Ms31 and the second noise map Ms32 when set to

[0075] Also, the vehicle exterior noise measurement device 10 of this modified example measures the noise generated when the right rear wheel tire 103 and the left rear wheel tire 104 of the vehicle 100 are simultaneously rotationally driven, that is, the noise generated when the sound sources are the right rear wheel tire 103 and the left rear wheel tire 104. Similarly, it may create a first noise map Ms31 and a second noise map Ms32 corresponding thereto. In this case, the position of the acoustic center is the position Pt in the middle between the right rear wheel tire 103 and the left rear wheel tire 104 shown in FIG. 3 34 is set to

[0076] (Second Modified Example) Next, a second modified example of the vehicle exterior noise measurement device 10 of the embodiment will be described.

[0077] The vehicle exterior noise measurement device 10 of this modified example measures noise by rotationally driving the wheels in the order of "four wheels", "front two wheels", "left front wheel", "right front wheel", "rear two wheels", "left rear wheel", "right rear wheel", and "four wheels". The rotational drive of each of "four wheels", "front two wheels", and "rear two wheels" is performed by controlling the chassis drum. The rotational drive of each of "left front wheel", "right front wheel", "left rear wheel", and "right rear wheel" is performed in the same manner as in the above embodiment.

[0078] According to this configuration, since the first noise map and the second noise map corresponding to the rotational drive of each of "four wheels", "front two wheels", "left front wheel", "right front wheel", "rear two wheels", "left rear wheel", and "right rear wheel" can be obtained, it becomes possible to analyze the noise generated from each tire 101 - 104 of the vehicle 100 with higher accuracy.

[0079] (Third Modified Example) Next, a third modified example of the vehicle exterior noise measurement device 10 of the embodiment will be described.

[0080] The measurement result creation unit 402 of this modification creates a graph G that can compare the noise levels P obtained when the wheels are rotationally driven for each of "left front wheel", "right front wheel", "left rear wheel", "right rear wheel", and "four wheels". i FIG. 18 shows an example of the graph G. The display control unit 403 outputs a screen including the graph G created by the measurement result creation unit 402 to the output unit 70 for display. In FIG. 18, the position in the vehicle longitudinal direction FB is taken on the horizontal axis, and the magnitude of the noise of each tire 101 to 104 of each wheel is taken on the vertical axis, and their relationship is shown in a graph. In FIG. 18, the solid line Ls1 indicates the magnitude of the noise when all of the tires 101 to 104 of each wheel are rotated, the one-dot chain line Ls2 indicates the magnitude of the noise when only the tire 101 of the right front wheel is rotated, and the two-dot chain line Ls3 indicates the magnitude of the noise when only the tire 102 of the left front wheel is rotated. Also, the short dashed line Ls4 indicates the magnitude of the noise when only the tire 103 of the right rear wheel is rotated, and the long dashed line Ls5 indicates the magnitude of the noise when only the tire 104 of the left rear wheel is rotated.

[0081] According to this configuration, among the tires 101 to 104 of the vehicle 100, it is possible to identify the tires that are likely to generate noise and also to grasp the direction in which the noise is generated. Therefore, the convenience can be further improved.

[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, only the vectors Va1 to Va corresponding to the position Om of the first acoustic center 11 and the noise area Aa may be displayed, or only the vectors Vb1 to Vb corresponding to the position Om of the second acoustic center 13 and the noise area may be displayed. Similarly, in the second noise map Ms12 shown in FIG. 12, only the vectors Vc1 to Vc corresponding to the position Om of the first acoustic center 12 and the noise area Aa may be displayed, or only the vectors Vb1 to Vb corresponding to the position Om of the second acoustic center 13 and the noise area may be displayed. Similarly, in the second noise map Ms12 shown in FIG. 12, only the vectors Vc1 to Vc corresponding to the position Om of the first acoustic center 11 and the noise area Aa may be displayed, or only the vectors Vb1 to Vb corresponding to the position Om of the second acoustic center 13Display only the noise area Ac or the position Om of the second acoustic center 12 Vectors Vd1 to Vd corresponding to 13 It is also possible to display only the noise area Ad.

[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 which noise is measured is not limited to the tires 101 to 104 of the vehicle 100, and any object that generates noise, such as the tires of a motorcycle, can be used.

[0086] Even if those skilled in the art make appropriate design changes to the above specific examples, as long as they have the features of the present disclosure, they are included in the scope of the present disclosure. Each element included in each of the above-described specific examples, and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. Each element included in each of the above-described specific examples can be changed in combination as appropriate as long as no technical contradiction occurs.

Explanation of reference numerals

[0087] M1 to M 15 : Microphone device (sound detection unit), 10: Vehicle exterior noise measurement device, 101 to 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, comprising: 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 surrounding the object; a calculation unit that calculates, for each of the plurality of detection positions, an intensity of noise radiated in a direction from the acoustic center toward the detection position based on a distance from the predetermined acoustic center of the object to the detection position and a volume 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, In the first noise map, the intensity of the noise radiated in a 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 a direction from the acoustic center toward the detection position is represented by the direction of an arrow of the vector. Exterior noise measuring device.

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

2. An exterior noise measuring device according to claim 1.

3. The measurement result creation unit further displays a predetermined noise area created so as to connect the respective tips of a plurality of vectors on the first noise map.

2. An exterior noise measuring device according to claim 1.

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

2. An exterior noise measuring device according to claim 1.

5. the object is a first tire and a second tire of a vehicle, The acoustic centers are set on a first tire and a second tire 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. An exterior noise measuring device according to claim 1.

6. the object is a tire of a vehicle, The acoustic center is set at a middle position between a plurality of tires provided on the vehicle.

2. An exterior noise measuring device according to claim 1.

7. An exterior noise measuring device for measuring noise generated from an object placed indoors, comprising: 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 surrounding the object; a calculation unit that calculates, for each of the plurality of detection positions, an intensity of noise radiated in a direction from the acoustic center toward the detection position based on a distance from the predetermined acoustic center of the object to the detection position and a volume 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, the measurement result creation unit further creates a second noise map in which the noise intensity at each of the plurality of detection positions is associated with a direction from the acoustic center toward the detection position, The display control unit further displays the second noise map. Exterior noise measuring device.

8. 1. An exterior noise measuring 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 disposed at a plurality of detection positions set at predetermined intervals in an area surrounding the object; calculating, for each of the plurality of detection positions, an intensity of noise radiated in a direction from the acoustic center toward the detection position based on a distance from the predetermined acoustic center of the object to the detection position and a volume of the sound detected by the sound detection unit; creating a first noise map in which the intensity of the noise corresponding to each of the plurality of detection positions is associated with a direction of the noise; Displaying the first noise map; In the first noise map, the intensity of the noise radiated in a 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 a direction from the acoustic center toward the detection position is represented by the direction of an arrow of the vector. How to measure exterior noise.

9. A program for causing a computer to measure noise generated from an object placed indoors, comprising: The computer includes: acquiring information on the volume of sound at each of a plurality of detection positions set at predetermined intervals in an area surrounding the object from a plurality of sound detection units disposed at each of the plurality of detection positions; 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; Displaying the first noise map; In the first noise map, the intensity of the noise radiated in a 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 a direction from the acoustic center toward the detection position is represented by the direction of an arrow of the vector. program.

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