JP6439957B2 - Noise simulation system - Google Patents

Description

  The present invention relates to a noise simulation system for simulating how noise generated at a site near a house is heard at a sound receiving point of the house.

  When construction is carried out at a site close to a residential area, a briefing session is held to gain the understanding of the surrounding residents before construction. In such a briefing session, the noise generated by the construction is X [dB]. For example, the noise can be reduced to Y [dB] by taking a noise countermeasure using a soundproof wall. Even so, an intuitive understanding cannot be obtained.

  Therefore, it is conceivable to simulate actual noise, have them listen to it, and understand the noise level. As a device for this purpose, a noise simulation system has been proposed.

For example, Patent Document 1 (Japanese Patent Laid-Open No. 10-133668) includes a noise simulation device B and a vibration simulation device C. The noise simulation device B has a sound insulation performance of a partition member constituting the experience room 11. Input sound insulation performance input means 3, noise recording / playback means 1, noise processing means 2 for attenuating noise according to the sound insulation performance, amplification means 4, and noise generation means 5 for outputting amplified noise The noise simulation device C is a noise / vibration simulation device comprising vibration recording / reproducing means 6 and 7, a control means 8 for controlling vibration waveforms, and an actuator 10 for outputting vibrations to the experience room 11. It is disclosed.
JP-A-10-133668

  However, the noise simulation system described in Patent Document 1 is a large-scale one that requires the experience room 11, and can be easily used at a resident briefing before construction. There was a problem that it was not.

The present invention solves the above-mentioned problems, and the invention according to claim 1 is directed to a map database storing map data, a plurality of noise source data, and an image for visualizing a noise source on the map data. a noise source database data and are stored, and the tablet devices including, on the basis of the noise source data, anda Could headphones simulations tone played by the tablet terminal, the noise source database A noise source type setting step for setting the type of the noise source from the plurality of noise source data stored in the memory, and setting the position of the noise source on the map data, and displaying the image data of the noise source at the position A noise source position setting step, a sound reception point setting step for setting a sound reception point on the map data, the noise source data, and the noise source position setting step. A simulated sound reproduction step for reproducing a simulated sound of the noise at the sound receiving point based on the position of the noise source set in step (b) and the sound receiving point set in the sound receiving point setting step. The noise simulation system is executed, and the noise source database includes noise source data of a dump truck, a trailer, a bulldozer, a backhoe, a crane, a pile driving machine, a ground improvement machine, and a generator construction. .

According to a second aspect of the present invention, in the noise simulation system according to the first aspect, the position of the sound insulation means is further set on the sound insulation means database storing a plurality of sound insulation means data and the map data. A sound insulation means position setting step, and in the simulated sound reproduction step, the sound reception means is further based on the sound insulation means database and the position of the sound insulation means set in the sound insulation means position setting step. It is characterized by reproducing a simulated sound of noise at a point.

According to a third aspect of the present invention, in the noise simulation system according to the second aspect, the sound insulation means database includes sound insulation means data of a sound insulation wall, a sound insulation door, a sound insulation sheet, and an antiphase system. And

According to a fourth aspect of the present invention, in the noise simulation system according to any one of the first to third aspects, the set position of the noise source is moved in the noise source position setting step. It is characterized by.

（ただし、
ＡＴＴは遮音手段の回折減衰［ｄＢ］であり、
Ｎ≧１．０のとき、ＡＴＴ＝１０×Ｌｏｇ（Ｎ）＋１３
０≦Ｎ＜１．０のとき、ＡＴＴ＝５＋８×Ｎ ^0.45
０．３≦Ｎ０のとき、ＡＴＴ＝５−８×｜Ｎ｜ ^0.4
Ｎ＜−０．３のとき、ＡＴＴ＝０
である。また、
Ｎはフレネル数で、Ｎ＝（２×δ）／λ
であり、また、
δは経路差で、δ＝（ｒ ₁ ＋ｒ ₂ ）―ｒ
であり、また、
λは波長で、λ＝Ｃ／ｆ （ｆ：中心周波数［Ｈｚ］）
であり、また、
Ｃは音の伝搬速度で、Ｃ＝３４０［ｍ／ｓ］
である。）
騒音源と受音点との間に設定された遮音手段を透過する透過音Ｌ _PA2 は下式（２）であり、

（ただし、
ＴＬは遮音手段の材料の透過損失［ｄＢ］である。）
回折音Ｌ _PA1 と透過音Ｌ _PA2 との合成騒音レベルＬ _PA を下式（３）で合成計算する

ことを特徴とする。
The invention according to claim 5 is the noise simulation system according to claim 2 or claim 3, wherein the diffracted sound L _PA1 from the sound insulation means set between the noise source and the sound receiving point is expressed by the following formula ( 1)

(However,
ATT is the diffraction attenuation [dB] of the sound insulation means,
When N ≧ 1.0, ATT = 10 × Log (N) +13
When 0 ≦ N <1.0, ATT = 5 + 8 × N ^0.45
When 0.3 ≦ N0, ATT = 5-8 × | N | ^0.4
ATT = 0 when N <−0.3
It is. Also,
N is the Fresnel number and N = (2 × δ) / λ
And also
δ is a path difference, and δ = (r ₁ + r ₂ ) −r
And also
λ is a wavelength, and λ = C / f (f: center frequency [Hz])
And also
C is the sound propagation speed, C = 340 [m / s]
It is. )
The transmitted sound L _PA2 that passes through the sound insulation means set between the noise source and the sound receiving point is expressed by the following equation (2):

(However,
TL is the transmission loss [dB] of the material of the sound insulation means. )
The composite noise level L _PA of the diffracted sound L _PA1 and the transmitted sound L _PA2 is synthesized and calculated by the following equation (3).

It is characterized by that.

  The noise simulation system according to the present invention can be configured from an information processing device such as a tablet terminal and headphones, and according to such a noise simulation system according to the present invention, with a simple configuration, It will be possible to experience the noise of the construction and intuitively grasp the noise level of the construction, so that it can be used at the resident briefing before construction.

It is a figure which shows an example of the information processing apparatus which can comprise the noise simulation system 1 which concerns on embodiment of this invention. It is a figure showing an example of composition of noise simulation system 1 concerning an embodiment of the present invention. It is a figure explaining the various databases of the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the flow of a process of the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the flow of the other process of the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the example of a display in the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the example of a display in the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the example of a display in the noise simulation system 1 which concerns on embodiment of this invention. It is a figure which shows the example of a display in the noise simulation system 1 which concerns on embodiment of this invention. It is a figure explaining the example of calculation of the attenuation of the noise by the soundproof wall in the noise simulation system 1 concerning the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It is a figure which shows an example of the information processing apparatus which can comprise the noise simulation system 1 which concerns on embodiment of this invention. In FIG. 1, 10 is a system bus, 11 is a CPU (Central Processing Unit), 12 is a RAM (Random Access Memory), 13 is a ROM (Read Only Memory), 14 is a communication control unit that controls communication with an external information device, 15 is an input control unit such as a keyboard controller, 16 is an output control unit, 17 is a storage device control unit, 18 is an input unit composed of input devices such as a keyboard, pointing device, mouse, and touch panel, and 19 is an output unit such as a printing device. , 20 is an HDD (Hard Disk
Drive), a storage device such as SSD (Solid State Drive), 21 is a graphic control unit, 22 is a display device, 31 is an audio control unit, and 32 is a headphone.

  In FIG. 1, the CPU 11 retrieves and acquires data by communicating with an external device in accordance with a program ROM stored in the ROM 13 or a program stored in the large-capacity storage device 20. Processing of output data in which images, characters, tables, and the like are mixed, and management of a database stored in the storage device 20 are further executed.

  Further, the CPU 11 comprehensively controls each device connected to the system bus 10. An operating system program (hereinafter referred to as OS), which is a basic program for controlling the CPU 11, is stored in the program ROM or the storage device 20 in the ROM 13. The ROM 13 or the storage device 20 stores various data used when performing output data processing or the like. The RAM 12 as a main memory functions as a main memory, work area, and the like for the CPU 11.

  The input control unit 15 controls the input unit 18 from a keyboard, a pointing device (not shown), or a touch panel. The output control unit 16 performs output control of the output unit 19 such as a printer, for example. In addition, the audio control unit 31 generates an electric signal to be generated by a connected headphone 32 or the like and sends it to the headphone 32, for example.

  The storage device control unit 17 is connected to a storage device 20 such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive) that stores a boot program, various applications, font data, user files, editing files, printer drivers, and the like. Control access. A system program for realizing the noise simulation system 1 of the present invention is stored in the storage device 20 as described above. The graphic control unit 21 is configured to perform drawing processing on information to be displayed on the display device 22.

  Further, the communication control unit 14 controls communication with an external device via a network, thereby acquiring data required by the system from a database held by an external device on the Internet or an intranet, It is configured to be able to send information to an external device.

  In addition to an operating system program (hereinafter referred to as OS) that is a control program for the CPU 11, the storage device 20 is installed and stored with a system program for operating the noise simulation system 1 of the present invention on the CPU 11 and data used in the system program.・ It is remembered.

As the data used in the system program for realizing the noise simulation system 1 of the present invention, it is basically assumed that the data is stored in the storage device 20. It is also possible to configure to acquire from an external device on the Internet or an intranet via the control unit 14. The data used in the system program that implements the noise simulation system 1 of the present invention can also be obtained from various media such as a USB memory, a CD, and a DVD.

  As the information processing apparatus as described above, a personal computer, a smart phone, or a tablet terminal can be used. In particular, a tablet that can be suitably used for the noise simulation system 1 of the present invention is a tablet. Type terminal 50. An example in which the noise simulation system 1 according to the embodiment of the present invention is configured using the tablet-type terminal 50 is shown in FIG.

  Next, a database stored in the storage device 20 of the noise simulation system 1 in the above configuration will be described. The noise simulation system 1 stores three databases, a map database 41, a noise source database 42, and a sound insulation means database 43, which can be used as appropriate by programs constituting the system 1.

  The map database 41 is a database in which map information and terrain information are stored, and a general-purpose one can be used as appropriate.

  The noise source database 42 is a database in which a plurality of noise sources are stored as digital data. Further, the noise source database 42 preferably includes digital image data so that the noise source can be visualized on the map data.

  The noise source data stored in such a noise source database 42 includes noise source data for construction work such as dump trucks, trailers, bulldozers, backhoes, cranes, pile driving machines, ground improvement machines, and generators. Is preferred. The noise source data stored in the noise source database 42 can be laid out in a superimposed manner on the map database 41 by the user.

  Further, the sound insulation means database 43 is made up of a plurality of sound insulation means stored as digital data. Furthermore, the sound insulation means database 43 preferably includes digital image data so that the sound insulation means can be visualized on the map data.

  It is preferable that the sound insulation means data stored in the sound insulation means database 43 includes a sound insulation wall, a sound insulation door, a sound insulation sheet, and an antiphase system. The sound insulation means data stored in the sound insulation means database 43 can be laid out superimposed on the map database 41 by the user.

  Processing of the noise simulation system 1 according to the embodiment of the present invention as described above will be described. In the map data selection step of step S100, the user selects desired map data from the map database 41 and performs setting. FIG. 6 is a diagram showing a state in which desired map data is selected from the map database 41 and displayed on the display device 22 in the noise simulation system 1.

In the subsequent noise source type setting step in step S101, the user selects desired noise source data from the noise source database. In the noise source position setting step in step S102, the selected noise source data is set to a desired position on the map data. FIG. 7 is a diagram showing a state where the dump truck (A) and the backhoe (B) are set on the map data on the map database 41 and displayed on the display device 22 in the noise simulation system 1. It is.

  In the subsequent sound receiving point setting step in step S103, the user sets a sound receiving point such as a house on the map data. FIG. 8 shows a state in which the house (X), the house (Y), and the house (Z) are set on the map data as the three sound receiving points and displayed on the display device 22 in the noise simulation system 1. FIG.

  After the various setting steps as described above, in step S104, a simulated sound is reproduced for each sound receiving point of the house (X), the house (Y), and the house (Z). In this step, based on the noise source data registered in the noise source database 42, the position of the noise source set in the noise source data setting step, and the position of the sound receiving point set in the sound receiving point setting step. Thus, the simulated sound of the noise at the sound receiving point is reproduced. In reproducing the simulated sound, a generally known calculation formula for sound attenuation can be used as appropriate. That is, a formula for calculating how the noise generated at the position of the noise source attenuates at the position of the receiving point can be used as appropriate.

  In addition, the simulated sound of the noise reproduced in step S104 can be heard by the headphones 32, but the headphones 32 can more easily grasp the noise level than when using a sounding body such as a speaker. In addition, the speaker needs to change the volume depending on the position of the person who listens to the simulation sound and output the sound, but the headphone 32 does not need such a thing and can reproduce the sound field more faithfully. In the noise simulation system 1 according to the above, it is an essential component requirement to use the headphones 32 (including earphones and the like).

  In the above flow, the simulated sound was reproduced without using the sound insulation means stored in the sound insulation means database 43. However, in another flow example, there is a step of setting the sound insulation means by the sound insulation means database 43. doing.

  FIG. 5 is a diagram showing another processing flow of the noise simulation system 1 according to the embodiment of the present invention. This flow is different from the previous flow in that it has a sound insulation means type setting step and a sound insulation means position setting step in a step preceding the simulated sound reproduction step in step S206.

  In the noise source type setting step in step S <b> 204, the user selects a desired sound insulation means from the sound insulation means database 43.

  In step S205, the user sets the sound insulation means selected in step S204, such as a soundproof wall, on the map data. FIG. 9 is a diagram showing a state in which the soundproof wall (P) and the soundproof wall (Q) are set on the map data as the two sound insulation means and displayed on the display device 22 in the noise simulation system 1.

  In step S206, the simulated sound is reproduced for each sound receiving point of the house (X), the house (Y), and the house (Z). In this step, the noise source data registered in the noise source database 42, the position of the noise source set in the noise source data setting step, the position of the sound receiving point set in the sound receiving point setting step, and sound insulation means Based on the position of the sound insulation means set in the position setting step, a simulated sound of noise at the sound receiving point is reproduced.

Further, the simulated sound of the noise reproduced in step S206 can be heard by the headphones 32. However, the headphones 32 can more easily grasp the noise level than the case where a sounding body such as a speaker is used. In the noise simulation system 1, it is an essential component requirement to use the headphones 32 (including earphones and the like).

  In reproducing the simulated sound, a generally known calculation formula for sound attenuation can be used as appropriate. An example of the calculation formula is given below. FIG. 10 is a diagram for explaining a calculation example of noise attenuation by the soundproof wall in the noise simulation system 1 according to the embodiment of the present invention. With reference to FIG. 10, a method of calculating the volume level at the sound receiving point when the soundproof wall is installed will be described.

When a soundproof wall is installed between the noise source and the sound receiving point, the sound is attenuated by a diffraction phenomenon caused by the soundproof wall. The attenuation of sound by the sound barrier is shown in the following equation.
<Calculation of diffraction sound from sound barrier>

(1)
However,
ATT is the diffraction attenuation [dB] of the sound barrier,
When N ≧ 1.0, ATT = 10 × Log (N) +13
When 0 ≦ N <1.0, ATT = 5 + 8 × N ^0.45
When 0.3 ≦ N0, ATT = 5-8 × | N | ^0.4
ATT = 0 when N <−0.3
It is. Also,
N is the Fresnel number and N = (2 × δ) / λ
And also
δ is a path difference, and δ = (r ₁ + r ₂ ) −r
And also
λ is a wavelength, and λ = C / f (f: center frequency [Hz])
And also
C is the sound propagation speed, C = 340 [m / s]
It is.
<Calculation of sound transmitted through sound barrier>

(2)
However,
TL is the transmission loss [dB] of the soundproof wall material.
<Synthesis of decibels>
The combined noise level L _PA of the diffracted sound L _PA1 and the transmitted sound L _PA2 is calculated by the following equation (3).

(3)
Note that the above calculation example is an example of a volume level calculation method, and other methods may be used.

  As described above, as shown in the flow of FIG. 4, the noise level when the sound insulation means is not used and the noise level when the sound insulation means is used as shown in the flow of FIG. It becomes possible to compare.

  The noise simulation system 1 according to the present invention can be composed of an information processing device such as a tablet terminal and a headphone 32. According to such a noise simulation system 1 according to the present invention, the noise simulation system 1 can be simplified. With the configuration, it is possible to experience the noise of the construction and intuitively grasp the noise level of the construction, so that it can be used at the resident briefing before construction.

10 ... System bus 11 ... CPU (Central Processing Unit)
12 ... RAM (Random Access Memory)
13 ... ROM (Read Only Memory)
14 ... Communication control unit 15 ... Input control unit 16 ... Output control unit 17 ... Storage device control unit 18 ... Input unit 19 ... Output unit 20 ... Storage device 21 ... Interface unit 21 Graphic control unit 22 Display device 31 Voice control unit 32 Headphone 41 Map database 42 Noise source database 43 Sound insulation means database 50 ..Tablet type terminals

Claims (5)

A map database that stores map data;
A tablet-type terminal including a plurality of noise source data and a noise source database storing image data for visualizing the noise source on the map data;
Based on the noise source data, a headphone that emits a simulation sound reproduced on the tablet terminal, and
A noise source type setting step for setting a type of a noise source from a plurality of noise source data stored in the noise source database;
A noise source position setting step for setting a position of a noise source on the map data and displaying image data of the noise source at the position;
A sound receiving point setting step for setting a sound receiving point on the map data;
Based on the noise source data, the position of the noise source set in the noise source position setting step, and the sound receiving point set in the sound receiving point setting step, simulation of noise at the sound receiving point is performed. A simulated sound playback step is performed to play the sound , and
The noise simulation system characterized in that the noise source database includes dump source, trailer, bulldozer, backhoe, crane, pile driver, ground improvement machine, and generator construction noise source data . further,
A sound insulation means database for storing a plurality of sound insulation means data;
On the map data, the sound insulation means position setting step for setting the position of the sound insulation means,
In the simulated sound reproduction step, the simulated sound of the noise at the sound receiving point is further reproduced based on the sound insulation means database and the position of the sound insulation means set in the sound insulation means position setting step. The noise simulation system according to claim 1. The noise simulation system according to claim 2, wherein the sound insulation means database includes sound insulation means data of a sound insulation wall, a sound insulation door, a sound insulation sheet, and an antiphase system. The noise simulation system according to any one of claims 1 to 3 , wherein the position of the noise source set in the noise source position setting step moves. Diffraction sound L from sound insulation means set between noise source and sound receiving point _PA1 Is the following formula (1),

(However,
ATT is the diffraction attenuation [dB] of the sound insulation means,
When N ≧ 1.0, ATT = 10 × Log (N) +13
When 0 ≦ N <1.0, ATT = 5 + 8 × N ^0.45
When 0.3 ≦ N0, ATT = 5-8 × | N | ^0.4
ATT = 0 when N <−0.3
It is. Also,
N is the Fresnel number and N = (2 × δ) / λ
And also
δ is a path difference, and δ = (r ₁ + R ₂ -R
And also
λ is a wavelength, and λ = C / f (f: center frequency [Hz])
And also
C is the sound propagation speed, C = 340 [m / s]
It is. )
Transmitted sound L that passes through the sound insulation means set between the noise source and the sound receiving point _PA2 Is the following equation (2),

(However,
TL is the transmission loss [dB] of the material of the sound insulation means. )
Diffraction sound L _PA1 And transmitted sound L _PA2 Noise level L with _PA Is calculated by the following formula (3)

The noise simulation system according to claim 2 or claim 3, wherein

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