Method and device for calculating the amount of sound-absorbing material installed

Abstract

To provide a calculation method and a calculation device for the installation quantity of sound absorbers that can reduce construction costs for a building structure.SOLUTION: A method for calculating an installation quantity of sound absorbers on an inside surface of a sound source room having a sound source comprises: calculating a direct transmitted sound pressure level as a sound pressure level of a direct transmission sound directly reaching a boundary wall or boundary floor for a sound reception room adjoining the sound source room and transmitted through the boundary wall or boundary floor to reach the sound reception chamber S9, a tentative installation quantity of sound absorbers provided to the sound source room being already determined; calculating an upper-limit value of a reflection transmitted sound pressure level as a sound pressure level of reflection transmitted sound reaching the boundary wall or boundary floor after being reflected in the sound source room and transmitted through the boundary wall or boundary floor to reach the sound reception room based upon a sound reception permissible value as a permissible value, in the sound reception room, of the sound pressure level of the sound transmitted through the boundary wall or boundary floor to reach the sound pressure room, and the direct transmitted sound pressure level S15; and calculating a reduction amount of sound absorbers from the tentative installation quantity based upon the upper-limit value and calculating a minimum installation amount of sound absorbers S17.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method and apparatus for calculating the amount of installation of sound-absorbing material. [Background technology]

[0002] With regard to architectural structures, for example, medium-sized structures larger than a detached house with two or three or more floors, and large-scale structures of even larger size, may have machine rooms in which machines such as air conditioners, exhaust fans, boiler equipment, etc. are installed. Since the machines installed in the machine rooms make noise, if offices, conference rooms, etc. that require quietness are located adjacent to the machine rooms, it is desirable to evaluate the impact of noise from the machine room on the adjacent offices, conference rooms, etc., for example, when designing the architectural structure. For example, Non-Patent Document 1 discloses an evaluation formula for sound pressure level when a noise source and a sound receiving point are both inside a room and are separated by a partition. Also, Non-Patent Document 2 discloses an evaluation formula for sound pressure level when a noise source is outside the room and sound enters the room through walls, floors, etc. Using such evaluation formulas, the impact of noise from a machine room on adjacent offices, conference rooms, etc. can be evaluated.

[0003] Incidentally, in such machine rooms, sound-absorbing materials such as glass wool are attached to the surfaces of the walls, etc., in order to reduce the impact of noise generated by the machines installed therein on adjacent offices, conference rooms, etc. Such sound-absorbing materials are often customarily placed on the entire surfaces of the walls and ceiling of the machine room. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Architectural Institute of Japan, "Practical Guidelines for Noise Control (2nd Edition)", April 1994, pp.30-31 [Non-Patent Document 2] Japan Acoustic Materials Association, "Noise and Vibration Control Handbook", 1982, p.267 Summary of the Invention [Problem to be solved by the invention]

[0005] In rooms such as offices and conference rooms where quiet operation is required, a noise tolerance level may be set, which is the level of noise that is permitted. The tolerance level is expressed, for example, by the NC value. If excessive sound-absorbing material is installed so that the noise in the room adjacent to the machine room is significantly lower than the above-mentioned allowable value, it means that more sound-absorbing material is installed in the machine room than is actually required. By reducing this excess sound-absorbing material, there is room to reduce construction costs. However, if the sound absorbing material is reduced too much, the noise in the adjacent room will exceed the allowable level and more noise than is allowed will reach the adjacent room. It is necessary to calculate the appropriate amount of sound-absorbing material to be installed in order to reduce the construction costs of building structures.

[0006] The problem to be solved by the present invention is to provide a method and device for calculating the amount of sound-absorbing material to be installed, which can reduce the construction costs of architectural structures by calculating the appropriate amount of sound-absorbing material to be installed. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention employs the following means. That is, the present invention is a method for calculating the amount of sound absorbing material to be provided on the inner surface of a sound source room having a sound source, in which a temporary installation amount of the sound absorbing material to be provided in the sound source room has already been determined, and a directly transmitted sound pressure level, which is the sound pressure level of a directly transmitted sound emitted from the sound source, which directly reaches a partition wall or partition floor between the sound source room and a sound receiving room adjacent to the sound source room, and which passes through the partition wall or partition floor to reach the sound receiving room, is calculated, and a sound pressure level of a directly transmitted sound emitted from the sound source, which passes through the partition wall or partition floor to reach the sound receiving room is calculated. The present invention provides a method for calculating an installation amount of sound-absorbing material, which calculates an upper limit value of a reflected transmitted sound sound pressure level, which is the sound pressure level of a reflected transmitted sound that is emitted from the sound source, is reflected in the sound source room, reaches the partition wall or the partition floor, and passes through the partition wall or the partition floor to reach the sound receiving room, based on a sound receiving room allowable value, which is an allowable value in the sound receiving room, of a pressure level of the reflected transmitted sound, and based on the directly transmitted sound sound pressure level, calculates an amount of reduction of the sound-absorbing material from the provisional installation amount based on the upper limit value, thereby calculating a minimum installation amount of the sound-absorbing material. Sound reaching the sound receiving room adjacent to the sound source room from the sound source room can be classified into direct transmitted sound, which is emitted from the sound source in the sound source room, reaches the partition wall or partition floor between the sound source room and the sound receiving room adjacent to the sound source room directly, and passes through the partition wall or partition floor to reach the sound receiving room, and reflected transmitted sound, which is emitted from the sound source, reflects in the sound source room, reaches the partition wall or partition floor, and passes through the partition wall or partition floor to reach the sound receiving room. Here, the amount of sound absorbing material provided in the sound source room affects the reflection of sound in the sound source room. Therefore, basically, the direct transmitted sound pressure level, which is the sound pressure level of the direct transmitted sound, does not depend on the amount of sound absorbing material, while the reflected transmitted sound pressure level, which is the sound pressure level of the reflected transmitted sound, varies depending on the amount of sound absorbing material. According to the above-mentioned configuration, based on such considerations, a sound receiving room tolerance is set, which is the tolerance in the sound receiving room for the sound pressure level of the sound emitted from the sound source and transmitted through the partition wall or partition floor to reach the sound receiving room, and the upper limit of the reflected transmitted sound pressure level is calculated based on the sound receiving room tolerance and the direct transmitted sound pressure level. As described above, the direct transmitted sound pressure level does not depend on the amount of sound absorbing material, so it can be uniquely evaluated from the position of the sound source in the sound source room, etc. Therefore, the upper limit of the reflected transmitted sound pressure level can also be uniquely calculated. The amount of sound absorbing material calculated based on the upper limit calculated in this way is the minimum amount of material that, if the amount of sound absorbing material is reduced any further and the sound pressure level of the reflected and transmitted sound increases, the sound pressure levels of the direct transmitted sound and the reflected and transmitted sound reaching the sound receiving room will exceed the sound receiving room tolerance. In other words, by providing only the minimum amount of sound absorbing material in the sound source room, the sound pressure level of the sound reaching the sound receiving room can be kept within the sound receiving room tolerance. Here, when calculating the minimum amount of sound-absorbing material to be installed, the amount of sound-absorbing material that would be temporarily installed on the inner surface of the sound source room is set as the provisional amount of installation, and the amount of sound-absorbing material that is reduced from the provisional amount of installation is calculated. The remaining amount of sound-absorbing material that is reduced from the provisional amount of installation corresponds to the minimum amount of sound-absorbing material to be installed. In this way, the amount of sound-absorbing material that is reduced from the provisional amount of installation is calculated, and the minimum amount of sound-absorbing material can be calculated. Since the minimum amount of sound-absorbing material to be installed can be calculated as described above, there is no need to install excessive amounts of sound-absorbing material. In addition, when installing sound-absorbing material in high places such as ceilings, scaffolding may be required, but if the amount of sound-absorbing material in high places is reduced, the need for scaffolding can be reduced. Therefore, construction costs can be reduced. In this way, by calculating the appropriate amount of sound-absorbing material to be installed, the construction costs of building structures can be reduced.

[0008] In one aspect of the present invention, the upper limit L pT In addition, the area S of the inner surface of the sound source chamber S , the average sound absorption coefficient α of the sound source room in the existing state in which the provisionally installed amount of the sound absorbing material is installed S , the room constant R of the sound source room in the existing state s , the sound absorption coefficient α of the sound absorbing material g , and the existing state reflected and transmitted sound sound pressure level L which is the sound pressure level of the reflected and transmitted sound in the existing state rT Based on this, the following equation

number

[0009] In another aspect of the present invention, a direct sound sound pressure level, which is the sound pressure level of direct sound emitted from the sound source and directly reaching the partition wall or the partition floor, is calculated, an existing state reflected sound sound pressure level, which is the sound pressure level of reflected sound emitted from the sound source in the existing state, reflected within the sound source room, and then reaching the partition wall or the partition floor, is calculated, the direct transmitted sound sound pressure level is calculated based on the difference between the direct sound sound pressure level and an acoustic transmission loss, which is the loss in sound pressure level when sound transmits through the partition wall or the partition floor, and the existing state reflected transmitted sound sound pressure level is calculated based on the difference between the existing state reflected sound sound pressure level and the acoustic transmission loss. According to the above-mentioned configuration, the sound pressure level of the direct sound emitted from the sound source and directly reaching the partition wall or the partition floor is reduced by the sound transmission loss when passing through the partition wall or the partition floor. Therefore, the direct sound sound pressure level can be appropriately calculated based on the difference between the direct sound sound pressure level, which is the sound pressure level of the direct sound, and the sound transmission loss. In addition, in the existing state where a provisional amount of sound-absorbing material is installed, the sound pressure level of the reflected sound that is emitted from the sound source and reflects in the sound source room before reaching the partition wall or partition floor is reduced by the amount of sound transmission loss when passing through the partition wall or partition floor. Therefore, the reflected and transmitted sound sound pressure level in the existing state can be appropriately calculated based on the difference between the reflected sound sound pressure level in the existing state, which is the sound pressure level of the reflected sound in the existing state, and the sound transmission loss.

[0010] In another aspect of the present invention, the sound-absorbing material is formed in a plate shape, and the installation amount of the sound-absorbing material is an installation area. According to the above-mentioned configuration, the sound absorbing material is formed in a plate shape, i.e., with a constant thickness, so that the installation amount can be calculated by calculating the installation area.

[0011] In another aspect of the present invention, the minimum installation amount of the sound-absorbing material is calculated for each of a plurality of frequency bands, and each of these is set as a candidate value for the installation amount, and the largest candidate value among the candidate values ​​is set as the minimum installation amount of the sound-absorbing material. According to the above-described configuration, the sound pressure level of the sound reaching the sound receiving room can be suppressed within the sound receiving room tolerance in any frequency band that is the subject of the calculation.

[0012] In another aspect of the present invention, a plurality of sound receiving rooms are provided for the same sound source room, and the minimum installation amount of the sound absorbing material is calculated for each of the plurality of sound receiving rooms and each is set as a candidate value for the installation amount, and the largest candidate value among the candidate values ​​is set as the minimum installation amount of the sound absorbing material. According to the above-described configuration, the sound pressure level of the sound reaching any sound receiving room adjacent to the sound source room can be kept within the sound receiving room tolerance.

[0013] The present invention also provides an apparatus for calculating an installation amount of a sound absorbing material to be provided on an inner surface of a sound source room having a sound source, the apparatus comprising: a direct transmission sound pressure level calculation unit that calculates a direct transmission sound sound pressure level, which is the sound pressure level of a direct transmission sound that is generated from the sound source, directly reaches a partition wall or partition floor between the sound source room and a sound receiving room adjacent to the sound source room, and passes through the partition wall or partition floor to reach the sound receiving room; and a direct transmission sound sound pressure level calculation unit that calculates a direct transmission sound sound pressure level, which is the sound pressure level of a direct transmission sound that is generated from the sound source, passes through the partition wall or partition floor to reach the sound receiving room, The present invention provides a calculation device for calculating an installation amount of sound-absorbing material, the calculation device including: a reflected transmitted sound sound pressure level upper limit calculation unit that calculates an upper limit of a reflected transmitted sound sound pressure level, which is the sound pressure level of a reflected transmitted sound that is emitted from the sound source, is reflected in the sound source room, reaches the partition wall or the partition floor, and passes through the partition wall or the partition floor to reach the sound receiving room, based on a sound receiving room allowable value, which is an allowable value in the sound receiving room, and the directly transmitted sound sound pressure level; and a sound-absorbing material installation amount calculation unit that calculates a reduction amount of the sound-absorbing material from the provisional installation amount based on the upper limit, to calculate a minimum installation amount of the sound-absorbing material. According to the above-mentioned configuration, the appropriate amount of sound-absorbing material to be installed can be calculated, thereby reducing the construction costs of building structures. Effect of the Invention

[0014] According to the present invention, it is possible to provide a method and device for calculating the appropriate amount of sound-absorbing material to be installed, which can reduce the construction costs of building structures. [Brief description of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view of an example of an architectural structure including a sound source room in which a sound absorbing material is to be installed and an adjacent sound receiving room in a method and device for calculating the amount of sound absorbing material to be installed according to an embodiment of the present invention. [Diagram 2] FIG. 4 is a block diagram of the calculation device for the amount of installation of the sound-absorbing material. [Diagram 3] 4 is a flowchart of a method for calculating the amount of the sound-absorbing material to be installed. [Figure 4] FIG. 2 is a cross-sectional view of the source and receiving rooms after appropriate sound absorbing material has been installed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an example of an architectural structure that includes a sound source room in which a sound absorbing material is to be installed and an adjacent sound receiving room, in a method and device for calculating the amount of sound absorbing material to be installed according to an embodiment of the present invention. In this embodiment, the architectural structure 1 is a medium-scale structure having two or three or more floors, which is larger than a detached house. The architectural structure 1 may be a large-scale structure having a larger scale. The architectural structure 1 is provided with a machine room in which machines such as air conditioners, exhaust fans, and boiler equipment are installed. The machines installed in the machine room generate noise. For this reason, when offices, conference rooms, etc. that require quiet operation are installed adjacent to the machine room, it is desirable to evaluate the impact of noise from the machine room on the adjacent offices, conference rooms, etc., for example, when designing the architectural structure 1. The method and device for calculating the amount of sound-absorbing material to be installed in this embodiment calculates the amount of sound-absorbing material to be installed when providing sound-absorbing material in a machine room such as the one described above to reduce the impact of the machine room on adjacent rooms.

[0017] The architectural structure 1 comprises a sound source room 2 and a sound receiving room 3. The sound source room 2 corresponds to the above-mentioned machine room, and each machine installed in the sound source room 2 becomes a sound source 6 that emits noise. The sound receiving room 3 is a room adjacent to the sound source room 2, such as the above-mentioned office or conference room. The sound receiving room 3 may be provided on either the top, bottom, or side of the sound source room 2, so long as it is adjacent to the sound source room 2. For example, as in the case of the sound receiving room 3A in FIG. 1, the sound receiving room 3A may be provided on the floor one level above the sound source room 2 so that the sound source room 2 and the sound receiving room 3A overlap when viewed from above, and the ceiling of the sound source room 2 may be used as a partition floor 4 to separate the sound source room 2 from the sound receiving room 3A. Alternatively, as in the case of the sound receiving room 3B in FIG. 1, the sound receiving room 3B may be provided on the same floor as the sound source room 2, next to the sound source room 2, and the wall of the sound source room 2 may be used as a partition wall 5 to separate the sound source room 2 from the sound receiving room 3B. Furthermore, the sound receiving room 3 may be provided on the floor one level below the sound source room 2 so that the sound source room 2 and the sound receiving room 3 overlap when viewed from above, and the floor of the sound source room 2 may be used as a partition floor 4 to separate the sound source room 2 from the sound receiving room 3. In this embodiment, the sound receiving room 3A provided above the sound source room 2 in Fig. 1 is taken as an example, and will be described as the sound receiving room 3 below, with the sound source room 2 and the sound receiving room 3 being separated by a boundary floor 4, which is the ceiling of the sound source room 2. The same explanation as below is also possible when the sound receiving room 3 is provided next to the sound source room 2 and they are separated by a boundary wall 5, for example, by appropriately reading the boundary floor 4 as the boundary wall 5. Alternatively, the same explanation is also possible when the sound receiving room 3 is provided below the sound source room 2 and they are separated by the boundary floor 4, which is the floor of the sound source room 2.

[0018] A sound absorbing material 7 is provided on the inner surface of the sound source chamber 2 in order to reduce the effect of the sound emitted by the sound source 6 provided in the sound source chamber 2 on the sound receiving chamber 3. A non-flammable and inexpensive material is generally used for the sound absorbing material 7. In this embodiment, the sound absorbing material 7 is glass wool or rock wool. The sound absorbing material 7 may be made of other materials. Particularly in this embodiment, the sound absorbing material 7 is formed in a plate shape so that the thickness is constant, for example, about 50 mm. The sound absorbing material 7 is wrapped in a wrapping material such as glass cloth. In this way, since the sound-absorbing material 7 is formed to have a constant thickness, particularly in the method and device for calculating the installation amount of the sound-absorbing material of this embodiment, the installation amount of the sound-absorbing material 7 is calculated by calculating the installation area of ​​the sound-absorbing material 7. That is, the installation amount of the sound-absorbing material 7 in this embodiment is synonymous with the installation area.

[0019] 2 is a block diagram of a calculation device 10 for calculating the amount of installation of sound-absorbing material. The calculation device 10 for the amount of installation of sound-absorbing material includes an input unit 11, a database 12, a direct sound sound pressure level calculation unit 13, an existing state reflected sound sound pressure level calculation unit 14, a direct transmitted sound sound pressure level calculation unit 15, an existing state reflected transmitted sound sound pressure level calculation unit 16, a reflected transmitted sound sound pressure level upper limit calculation unit 17, a sound-absorbing material installation amount calculation unit 18, and an output unit 19. The calculation device 10 for calculating the amount of installation of sound-absorbing material is made up of a computer device, and calculates an appropriate amount of installation of the sound-absorbing material 7 by executing processing based on a preset computer program.

[0020] For example, when designing an architectural structure 1, as shown in Fig. 1, sound absorbing material 7 is customarily placed on the entire surface of the walls and ceiling of a sound source room 2. In many cases, this means that an excessive amount of sound absorbing material 7 is provided compared to the amount actually required. In this embodiment, a provisional installation amount of the sound-absorbing material 7 to be installed in the sound source room 2 is determined in advance as a state in which an excessive amount of the sound-absorbing material 7 is installed, as shown in Fig. 1. When this state is taken as an existing state in which the sound-absorbing material 7 has already been installed, the calculation device 10 for the installation amount of the sound-absorbing material calculates the reduction amount of the sound-absorbing material 7 from the existing state, and calculates the minimum installation amount of the sound-absorbing material 7, which is taken as the appropriate installation amount of the sound-absorbing material 7.

[0021] The input unit 11 is, for example, a keyboard or a mouse, and receives input of parameters used for various calculations within the calculation device 10 for the installation amount of sound-absorbing material, as will be described later. The database 12 is a storage medium such as a memory or a hard disk. The database 12 appropriately stores the parameters input by the input unit 11 and the calculation results of each of the direct sound sound pressure level calculation unit 13, the existing state reflected sound sound pressure level calculation unit 14, the direct transmitted sound sound pressure level calculation unit 15, the existing state reflected transmitted sound sound pressure level calculation unit 16, the reflected transmitted sound sound pressure level upper limit calculation unit 17, and the sound absorbing material installation amount calculation unit 18.

[0022] The direct sound sound pressure level calculation unit 13 calculates the direct sound sound pressure level, which is the sound pressure level of the direct sound that is emitted from the sound source 6 and directly reaches the boundary floor 4. The existing state reflected sound sound pressure level calculation unit 14 calculates the existing state reflected sound sound pressure level, which is the sound pressure level of the reflected sound that is emitted from the sound source 6, reflected within the sound source room 2, and then reaches the boundary floor 4 in the existing state. The direct transmitted sound sound pressure level calculation unit 15 calculates the direct transmitted sound sound pressure level, which is the sound pressure level of the directly transmitted sound emitted from the sound source 6, directly reaching the boundary floor 4 with the sound receiving room 3, transmitting through the boundary floor 4 and reaching the sound receiving room 3, based on the difference between the direct sound sound pressure level and the sound transmission loss, which is the loss in sound pressure level when sound transmits through the boundary floor 4. The existing state reflected and transmitted sound sound pressure level calculation unit 16 calculates the existing state reflected and transmitted sound sound pressure level, which is the sound pressure level in the existing state of the reflected and transmitted sound that is emitted from the sound source 6, reflected within the sound source room 2, reaches the boundary floor 4, passes through the boundary floor 4 and reaches the sound receiving room 3, based on the difference between the reflected sound sound pressure level in the existing state and the sound transmission loss. The reflected and transmitted sound sound pressure level upper limit calculation unit 17 calculates the upper limit of the reflected and transmitted sound sound pressure level, which is the sound pressure level of the reflected and transmitted sound, based on the sound receiving room allowable value, which is the allowable value in the sound receiving room 3 for the sound pressure level of the sound emitted from the sound source 6, transmitted through the boundary floor 4, and reaching the sound receiving room 3, and the direct transmitted sound sound pressure level. The sound-absorbing material installation amount calculation unit 18 calculates the reduction amount of the sound-absorbing material 7 from the provisional installation amount based on the upper limit value, and calculates the minimum installation amount of the sound-absorbing material 7.

[0023] The output unit 19 is, for example, a display or a printer, and outputs and displays the calculation results in the sound-absorbing material installation amount calculation unit 18 to the outside.

[0024] Next, a method for calculating the amount of installation of sound-absorbing material in the calculation device 10 for calculating the amount of installation of sound-absorbing material will be described. FIG. 3 is a flowchart showing the flow of a method for calculating the amount of sound-absorbing material to be installed. When the process is started (step S1), first, the input unit 11 accepts input of parameters used for various calculations in the calculation device 10 for the installation amount of sound-absorbing material (step S3). The parameters include parameters related to the sound source room 2 and the sound receiving room 3, parameters related to the sound-absorbing material 7, parameters related to the boundary floor 4 that separates the sound source room 2 and the sound receiving room 3, and parameters related to the sound source 6 installed in the sound source room 2.

[0025] The parameters for the source room 2 and the receiving room 3 are the area S of the inner surface of the source room 2. s , the area S of the inner surface of the sound receiving room 3 r , average sound absorption coefficient α of sound receiving room 3 r Includes. The parameters for source room 2 and receiving room 3 are the receiving room tolerance L p Further includes the sound receiving room tolerance Lp is the allowable value, i.e., the maximum value, in the sound receiving room 3 of the sound pressure level of the sound that is emitted from the sound source 6 in the sound source room 2, passes through the boundary floor 4, and reaches the sound receiving room 3. A noise allowable value may be set in an office, a conference room, etc., to indicate how much noise is permitted. The allowable value is expressed, for example, by an NC value. For example, in the database 12, the purpose of use of the sound receiving room 3 (e.g., office, conference room, etc.) may be linked to the NC value or dB (decibel) value required for that purpose, and when the purpose of use of the sound receiving room 3 is selected, it is automatically converted into an NC value or dB value, which is the sound receiving room allowable value L. p It is desirable to realize a calculation device 10 for calculating the amount of sound-absorbing material to be installed so as to be used as a sound-absorbing material installation amount calculator.

[0026] The parameters related to the sound absorbing material 7 are the sound absorption coefficient α g For example, the database 12 may include the type of sound absorbing material 7 and the sound absorption coefficient α g When you select the type of sound absorbing material 7, the sound absorption coefficient α of the sound absorbing material 7 is automatically g It is desirable to realize the calculation device 10 for the amount of installation of the sound-absorbing material so that the above equation is set.

[0027] Parameters related to the boundary floor 4 that separates the sound source room 2 and the sound receiving room 3 include the sound transmission loss TL, which is the loss in sound pressure level when sound passes through the boundary floor 4, and the area F of the transmitting surface. The sound transmission loss TL is the amount of energy reduction between when an incident sound enters the surface of the boundary floor 4 from the sound source room 2 side, passes through the boundary floor 4, and exits from the surface of the sound receiving room 3 side. For example, as shown in FIG. 1, even when a sound absorbing material 7 is provided on the boundary floor 4 in the existing state, the sound transmission loss TL is determined depending only on the structure of the boundary floor 4 part constructed as a slab of the architectural structure 1 without considering the sound absorbing material 7. The sound transmission loss TL is a constant value depending on the material constituting the boundary floor 4 such as concrete and the thickness of the boundary floor 4. Therefore, it is desirable to realize a calculation device 10 for the installation amount of sound absorbing material so that, for example, the structure including the material and thickness of the boundary floor 4 is linked to the value of the sound transmission loss TL in the structure in the database 12, and when the structure of the boundary floor 4 is selected, the sound transmission loss TL corresponding to the structure is automatically set. When the sound receiving room 3 is installed on the floor above or below the sound source room 2, the area F of the transmitting surface is the area of ​​the overlapping part of the sound source room 2 and the sound receiving room 3 when viewed from above. For example, in the case of the sound receiving room 3A in FIG. 1, where the sound receiving room 3 is included in the sound source room 2 when viewed from above, the area of ​​the floor of the sound receiving room 3 is the area F of the transmitting surface. In addition, in the case of the sound receiving room 3C adjacent to the sound receiving room 3A on the left side of the paper, where the sound source room 2 and the sound receiving room 3 are not included in each other when viewed from above, the overlapping part of the sound source room 2 and the sound receiving room 3 when viewed from above (area F3 in FIG. 1) is the area F of the transmitting surface. Alternatively, in the case of the sound receiving room 3B located next to the sound source room 2, the area of ​​the partition wall 5 that separates them is the area F of the transmitting surface.

[0028] The parameters related to the sound sources 6 installed in the sound source room 2 are the number N of the sound sources 6 and the distance r of each sound source 6 to the boundary floor 4. i (i=1~N), power level PWL of each sound source 6 i (i=1~N). The sound emitted by the sound source 6 reaches the boundary floor 4 in the shortest distance, and by shaking the boundary floor 4, reaches the sound receiving room 3. Therefore, the distance r i In this embodiment, for example, in FIG. 1 , r 2The distance r is the straight-line distance from the sound source 6 to the boundary floor 4. i may be the straight-line distance from the surface of the machine housing that constitutes the sound source 6, facing the boundary floor 4, to the boundary floor 4, or may be the straight-line distance from a position considered to be the center of gravity of the machine to the boundary floor 4. Alternatively, if a part of the machine that can be a noise source is identified, it may be the straight-line distance from that part to the boundary floor 4. The input unit 11 stores the above input parameters in the database 12 . The calculation device 10 and calculation method for the amount of installation of sound-absorbing material according to this embodiment calculates an appropriate amount of installation of the sound-absorbing material 7 based on the above parameters, as will be described in detail later.

[0029] The sound emitted from the sound source 6 and reaching the boundary floor 4 can be classified into direct sound that reaches the boundary floor 4 directly and reflected sound that is emitted from the sound source 6, reflects within the sound source room 2, and then reaches the boundary floor 4. As already explained, in the calculation device 10 for the installation amount of sound-absorbing material of this embodiment, a provisional installation amount, which is a temporary installation amount of the sound-absorbing material 7 provided in the sound source room 2, is determined in advance as an existing state, and the calculation device 10 calculates the reduction amount of the sound-absorbing material 7 from the existing state to calculate the minimum installation amount of the sound-absorbing material 7, which is set as an appropriate installation amount of the sound-absorbing material 7. For this reason, the calculation device 10 for the installation amount of sound-absorbing material first calculates the sound pressure level of the direct sound and the sound pressure level of the reflected sound in this existing state. Here, the amount of sound-absorbing material 7 provided in the sound source room 2 affects the reflection of sound within the sound source room 2. Therefore, basically, the sound pressure level of the direct sound does not depend on the amount of sound-absorbing material 7, while the sound pressure level of the reflected sound varies depending on the amount of sound-absorbing material 7. Therefore, the calculation device 10 for the installation amount of sound-absorbing material calculates the sound pressure level of the direct sound as being independent of the amount of sound-absorbing material 7, and calculates the sound pressure level of the reflected sound as being dependent on the amount of sound-absorbing material 7.

[0030] Specifically, in the sound-absorbing material installation amount calculation device 10, when parameters are input in step S3, the direct sound sound pressure level calculation unit 13 first calculates the direct sound sound pressure level, which is the sound pressure level of the direct sound emitted from the sound source 6 and directly reaching the boundary floor 4 (step S5). Specifically, the direct sound sound pressure level calculation unit 13 calculates the direct sound sound pressure level L by the following formula (1): d Calculate.

number

[0031] Next, the existing state reflected sound sound pressure level calculation unit 14 calculates the existing state reflected sound sound pressure level, which is the sound pressure level of the reflected sound that is emitted from the sound source 6, reflected within the sound source room 2, and then reaches the boundary floor 4 in the existing state (step S7). Specifically, the existing state reflected sound sound pressure level calculation unit 14 calculates the existing state reflected sound sound pressure level L r Calculate.

number

number

[0032] Next, the direct transmitted sound sound pressure level calculation unit 15 calculates the direct transmitted sound sound pressure level, which is the sound pressure level of the direct transmitted sound that is emitted from the sound source 6, reaches the boundary floor 4 directly, passes through the boundary floor 4 and reaches the sound receiving room 3 (step S9). The direct sound emitted from the sound source 6 and directly reaching the boundary floor 4 passes through the boundary floor 4 and is emitted from the surface on the sound receiving room 3 side, during which the sound pressure level is reduced. Taking this into consideration, the direct transmitted sound sound pressure level calculation unit 15 calculates the direct sound sound pressure level L as shown in the following equation (4). d and the sound transmission loss TL (L d -TL) based on the direct transmitted sound pressure level L dT Calculate.

number

number

[0033] Next, the existing state reflected and transmitted sound sound pressure level calculation unit 16 calculates the existing state reflected and transmitted sound sound pressure level, which is the sound pressure level of the reflected and transmitted sound that is emitted from the sound source 6 in the existing state, is reflected within the sound source room 2, reaches the boundary floor 4, and passes through the boundary floor 4 to reach the sound receiving room 3 (step S11). In the existing condition, the reflected sound emitted from the sound source 6, reflected in the sound source room 2, and then reaches the boundary floor 4, passes through the boundary floor 4, and is emitted from the surface on the sound receiving room 3 side, during which the sound pressure level is reduced. Taking this into consideration, the existing condition reflected and transmitted sound sound pressure level calculation unit 16 calculates the existing condition reflected sound sound pressure level L as shown in the following formula (6). r and the sound transmission loss TL (L r -TL) based on the existing state reflected and transmitted sound pressure level L rT Calculate.

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[0034] As already explained, the sound emitted from the sound source 6 and reaching the boundary floor 4 can be classified into direct sound that directly reaches the boundary floor 4 and reflected sound that is emitted from the sound source 6 and reaches the boundary floor 4 after being reflected in the sound source room 2. Therefore, the sound emitted from the sound source 6 and reaching the sound receiving room 3 can also be classified into direct transmitted sound and reflected transmitted sound as described above. In other words, the sound pressure level of the sound arriving from the sound source room 2 in the sound receiving room 3 can be expressed as the energy sum of the sound pressure levels of the direct transmitted sound and the reflected transmitted sound. Here, this energy sum is the sound receiving room allowable value L, which is the allowable value in the sound receiving room 3 for the sound pressure level of the sound emitted from the sound source 6 in the sound source room 2, transmitted through the boundary floor 4, and reaching the sound receiving room 3. p It must have the following value: Here, in the existing state, the sound absorbing material 7 is excessively provided so as to cover, for example, the entire surface of the walls and ceiling of the sound source room 2. Therefore, the sound pressure level of the reflected and transmitted sound in the existing state, which is the sound pressure level of the reflected and transmitted sound in the existing state, is rT Basically, the value is smaller than necessary. Therefore, the sound pressure level of the directly transmitted sound, L dT and the existing reflected and transmitted sound pressure level L rT The sum of the energy of and is the sound receiving room allowable value L p It should have the following value: In the next step S13, the calculation device 10 for the amount of installation of the sound absorbing material confirms that this state is in place. More specifically, the calculation device 10 for the amount of installation of the sound absorbing material checks that the directly transmitted sound pressure level L dT and existing condition reflected and transmitted sound pressure level L rT The sum of the energy of the sound receiving room is the allowable value L p Whether or not the value is as follows is determined by the following formula (7).

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[0035] Directly transmitted sound pressure level L dT and existing condition reflected and transmitted sound pressure level L rT The sum of the energy of the sound receiving room is the allowable value L pThe sound pressure level of the sound reaching the receiving room 3 from the sound source room 2 is greater than the sound receiving room tolerance L p If it exceeds this limit (No in step S13), proceed to step S3, make design changes such as changing the structure of the boundary floor 4 to one with higher sound insulation performance, or changing the material or thickness of the sound-absorbing material 7, and then repeat steps S5 to S11.

[0036] Directly transmitted sound pressure level L dT and existing condition reflected and transmitted sound pressure level L rT The sum of the energy of the sound receiving room is the allowable value L p If the value is below the threshold (Yes in step S13), a reduction in the amount of sound-absorbing material 7 from the existing state is considered. When the sound absorbing material 7 is reduced, the sound pressure level of the direct transmitted sound does not change, and only the sound pressure level of the reflected transmitted sound increases. As for the sound that reaches the sound receiving room 3 from the sound source room 2, as described above, the sound receiving room allowable value L p In this embodiment, when the sound pressure level of the directly transmitted sound is considered to be a fixed value, the upper limit of how large the sound pressure level of the reflected transmitted sound is allowed to be is calculated, and the sound absorbing material 7 is reduced to the extent that it becomes equal to the upper limit. Specifically, the reflected and transmitted sound sound pressure level upper limit calculation unit 17 calculates the sound receiving room allowable value L p and the direct transmitted sound pressure level L dT Based on this, the upper limit L of the reflected and transmitted sound sound pressure level, which is the sound pressure level of the reflected and transmitted sound, is pT is calculated by the following equation (8) (step S15).

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[0037] Upper limit L of reflected and transmitted sound pressure level pTIn other words, the sound absorbing material 7 in the sound source room 2 is placed in such a manner that the sound pressure level of the sound reaching the sound receiving room 3 from the sound source room 2 is equal to or lower than the sound receiving room allowable limit L p This is the sound pressure level of the reflected and transmitted sound when the sound pressure level is reduced to the maximum extent possible so that the sound pressure level satisfies the above. Therefore, the upper limit value L pT can be expressed as the following equation (9), similarly to equation (6).

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[0038] By transforming equation (11), we obtain the following equation (13).

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[0039] Here, by subtracting equation (6) from equation (9) and applying equations (2) and (10), the following equation (15) is obtained.

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[0040] As shown in equation (16), the value of B in equation (18) is the upper limit value L of the reflected and transmitted sound pressure level. pT and the existing reflected and transmitted sound pressure level L rT It is calculated as follows: That is, the reduction amount ΔS of the sound absorbing material 7 g is the upper limit of the reflected and transmitted sound pressure level L pT In addition, the area of ​​the inner surface of the sound source room 2, S s , the average sound absorption coefficient α of the sound source room 2 in the existing state where the provisionally installed amount of sound absorbing material 7 is installed s , the room constant R of the sound source room 2 in the existing state s , the sound absorption coefficient α of the sound absorbing material 7 g , and existing state reflected and transmitted sound pressure level L rT It is calculated based on.

[0041] In this way, the sound absorbing material installation amount calculation unit 18 calculates the upper limit L of the reflected and transmitted sound pressure level. pT Based on this, the reduction amount of sound absorbing material 7 ΔS g Calculate. The sound absorbing material installation amount calculation unit 18 calculates the reduction amount ΔS of the sound absorbing material 7 from the provisional installation amount of the sound absorbing material 7 in the existing state. g The minimum amount of sound-absorbing material 7 to be installed is calculated by calculating the above.

[0042] The calculation device 10 for the amount of installation of sound-absorbing material outputs the minimum installation amount of the sound-absorbing material 7 calculated by the sound-absorbing material installation amount calculation unit 18 to the output unit 19. Fig. 4 is a cross-sectional view of the sound source room 2 and the sound receiving room 3 after installing appropriate sound absorbing material 7. In Fig. 4, the sound absorbing material 7 is removed from the existing state shown in Fig. 1 in the portion indicated by the dashed line using the reference numeral 8.

[0043] Next, the effects of the above-mentioned method and device for calculating the amount of sound-absorbing material to be installed will be described.

[0044] In this embodiment, the method for calculating the amount of the sound absorbing material 7 to be installed on the inner surface of the sound source room 2 having the sound source 6 is a method for calculating the amount of the sound absorbing material 7 to be installed on the inner surface of the sound source room 2 having the sound source 6, in which the provisional installation amount of the sound absorbing material 7 to be installed in the sound source room 2 has already been determined, and the direct transmitted sound sound pressure level L dT The sound pressure level of the sound emitted from the sound source 6 and transmitted through the partition wall 5 or partition floor 4 to the sound receiving room 3 is calculated as the sound receiving room allowable value L p and the direct transmitted sound pressure level L dT Based on this, the upper limit value L of the reflected and transmitted sound sound pressure level is the sound pressure level of the reflected and transmitted sound that is emitted from the sound source 6, reflected in the sound source room 2, reaches the partition wall 5 or the partition floor 4, and then passes through the partition wall 5 or the partition floor 4 to reach the sound receiving room 3. pT Calculate the upper limit L pT Based on this, the reduction amount of sound-absorbing material 7 from the provisional installation amount, ΔS g The minimum amount of sound-absorbing material 7 to be installed is calculated by calculating the above. The sound that reaches the sound receiving room 3 adjacent to the sound source room 2 from the sound source room 2 can be classified into two types: direct transmitted sound that is emitted from the sound source 6, reaches the partition wall 5 or partition floor 4 between the sound source room 2 and the sound receiving room 3 adjacent to the sound source room 2 directly, and reaches the sound receiving room 3 through the partition wall 5 or partition floor 4, and reflected transmitted sound that is emitted from the sound source 6, reflects within the sound source room 2, reaches the partition wall 5 or partition floor 4, and reaches the sound receiving room 3 through the partition wall 5 or partition floor 4. Here, the amount of sound absorbing material 7 provided in the sound source room 2 affects the reflection of sound within the sound source room 2. Therefore, the direct transmitted sound sound pressure level L dT does not depend on the amount of sound-absorbing material 7, while the reflected and transmitted sound sound pressure level, which is the sound pressure level of the reflected and transmitted sound, fluctuates depending on the amount of sound-absorbing material 7. According to the above-mentioned configuration, based on such considerations, the sound pressure level of the sound emitted from the sound source 6 and transmitted through the partition wall 5 or the partition floor 4 to the sound receiving room 3 is the allowable value in the sound receiving room 3, which is the sound receiving room allowable value L p Set the sound receiving room tolerance L p and the direct transmitted sound pressure level L dT Based on this, the upper limit of the reflected and transmitted sound pressure level L pT As shown above, the direct transmitted sound pressure level L dT Since it does not depend on the amount of sound absorbing material 7, it can be uniquely evaluated from the position of the sound source 6 in the sound source room 2. Therefore, the upper limit value L of the reflected and transmitted sound pressure level pT can also be calculated uniquely. The upper limit L calculated in this way pT The amount of the sound absorbing material 7 is calculated based on the above. If the sound absorbing material 7 is further reduced and the sound pressure level of the reflected and transmitted sound increases, the sound pressure levels of the direct transmitted sound and the reflected and transmitted sound reaching the sound receiving room 3 will exceed the sound receiving room tolerance L p In other words, by providing the sound source room 2 with the sound absorbing material 7 of the minimum amount, the sound pressure level of the sound reaching the sound receiving room 3 can be reduced to the sound receiving room permissible limit L p can be kept within. Here, when calculating the minimum installation amount of the sound absorbing material 7, the installation amount when the sound absorbing material 7 is temporarily installed on the inner surface of the sound source room 2 is defined as the provisional installation amount, and the reduction amount ΔS of the sound absorbing material 7 from the provisional installation amount is defined as gCalculate the reduction amount ΔS of the sound absorbing material 7. g The remaining amount corresponds to the minimum installation amount of the sound absorbing material 7. In this way, the reduction amount ΔS of the sound absorbing material 7 from the provisional installation amount is g By calculating the above, the minimum installation amount of the sound-absorbing material 7 can be calculated. Since the minimum amount of sound-absorbing material 7 to be installed can be calculated as described above, there is no need to install an excessive amount of sound-absorbing material 7. Furthermore, when installing sound-absorbing material 7 in a high place, such as a ceiling, it may be necessary to set up scaffolding, but if the amount of sound-absorbing material 7 in high places is reduced, the need to set up scaffolding can be reduced. Therefore, construction costs can be reduced. In this way, by calculating the appropriate amount of sound-absorbing material 7 to be installed, the construction costs of the architectural structure 1 can be reduced.

[0045] For example, it is theoretically possible to calculate the amount of sound-absorbing material 7 to be installed by appropriately changing the amount of sound-absorbing material 7 and repeating the calculation until formula (7) is satisfied to the very last. However, this method does not limit the upper limit L of the reflected and transmitted sound pressure level. pT Since an appropriate amount of the sound-absorbing material 7 to be installed corresponding to the above cannot be calculated, the amount of the sound-absorbing material 7 basically ends up being greater than the appropriate amount. Therefore, the amount of the sound-absorbing material 7 installed may be excessive. Furthermore, this method requires repeated trial and error processing, which takes time. In contrast, in the above-mentioned method and device for calculating the amount of sound-absorbing material to be installed, the upper limit L of the reflected and transmitted sound pressure level is pT Since an appropriate amount of the sound-absorbing material 7 to be installed corresponding to the above can be obtained by a single calculation, installation of an excessive amount of the sound-absorbing material 7 can be prevented and the calculation does not require much time.

[0046] In the above embodiment, the sound receiving room tolerance L p From the direct transmitted sound pressure level L dT The upper limit L is calculated by subtracting the energy addition. pT Calculate. According to the above-mentioned configuration, the sound receiving room tolerance L p From the direct transmitted sound pressure level L dT The upper limit L is calculated by subtracting the energy addition. pT In order to calculate the upper limit of the reflected and transmitted sound pressure level, L pT The sound receiving room tolerance L p and the direct transmitted sound pressure level L dT It can be appropriately calculated as the difference between

[0047] In the above embodiment, the upper limit L pT In addition, the area of ​​the inner surface of the sound source room 2, S s , the average sound absorption coefficient α of the sound source room 2 in the existing state where the provisionally installed amount of sound absorbing material 7 is installed s , the room constant R of the sound source room 2 in the existing state s , the sound absorption coefficient α of the sound absorbing material 7 g , and the sound pressure level of the reflected and transmitted sound in the existing state, L rT Based on this, the reduction amount ΔS is calculated using equations (16) and (18). g Calculate. According to the above-mentioned configuration, the reduction amount ΔS of the sound absorbing material 7 g can be calculated appropriately.

[0048] In particular, in the above embodiment, the reduction amount ΔS of the sound absorbing material 7 g As shown in formula (18), it can be calculated by a simple formula. Since the calculation of formula (18) does not require a large amount of calculation, the reduction amount ΔS can be calculated simply, easily, and quickly using a spreadsheet software or the like. g can be calculated. In addition, since formula (18) is based on the above theoretical considerations, the reduction amount ΔS of the sound absorbing material 7 g The calculated value is more persuasive than if it were determined intuitively, empirically, or by trial and error.

[0049] In the above embodiment, the direct sound sound pressure level L, which is the sound pressure level of the direct sound emitted from the sound source 6 and directly reaching the partition wall 5 or the partition floor 4, is dThe reflected sound sound pressure level L in the existing condition is the sound pressure level of the reflected sound emitted from the sound source 6, reflected in the sound source room 2, and then reaching the partition wall 5 or the partition floor 4 in the existing condition. r Calculate the direct sound pressure level L d and the sound transmission loss TL, which is the loss of sound pressure level when sound transmits through the partition wall 5 or partition floor 4 (L d -TL) based on the direct transmitted sound pressure level L dT Calculate the reflected sound pressure level L r and the sound transmission loss TL (L r -TL) based on the existing state reflected and transmitted sound pressure level L rT Calculate. According to the above-mentioned configuration, the sound pressure level of the direct sound emitted from the sound source 6 and directly reaching the partition wall 5 or the partition floor 4 is reduced by the sound transmission loss TL when passing through the partition wall 5 or the partition floor 4. Therefore, the sound pressure level of the direct sound, which is the direct sound sound pressure level L d and the sound transmission loss TL (L d -TL) based on the direct transmitted sound pressure level L dT can be calculated appropriately. In addition, in the existing condition where the provisionally installed amount of sound absorbing material 7 is installed, the reflected sound emitted from the sound source 6, reflected in the sound source room 2, and then reaches the partition wall 5 or partition floor 4 has a sound pressure level reduced by the sound transmission loss TL when passing through the partition wall 5 or partition floor 4. Therefore, the sound pressure level of the reflected sound in the existing condition, L r and the sound transmission loss TL (L r -TL) based on the existing state reflected and transmitted sound pressure level L rT can be calculated appropriately.

[0050] Moreover, the sound absorbing material 7 is formed in a plate shape, and the amount of the sound absorbing material 7 installed is the installation area. According to the above-mentioned configuration, the sound absorbing material 7 is formed in a plate shape, that is, so as to have a constant thickness, so that the installation amount can be calculated by calculating the installation area.

[0051] The sound source room 2 is a machine room in which machines are installed, and the sound absorbing material 7 is glass wool or rock wool. According to the above-mentioned configuration, the method of calculating the installation amount of the sound-absorbing material 7 can be appropriately realized.

[0052] In addition, the calculation device 10 for the amount of installation of the sound absorbing material in this embodiment is a device for calculating the amount of installation of the sound absorbing material 7 to be provided on the inner surface of the sound source room 2 having the sound source 6, and the provisional installation amount of the sound absorbing material 7 to be provided in the sound source room 2 has already been determined. The direct transmitted sound sound pressure level L dT and a sound receiving room allowable value L, which is the allowable value in the sound receiving room 3 of the sound pressure level of the sound emitted from the sound source 6 and transmitted through the partition wall 5 or the partition floor 4 to reach the sound receiving room 3. p and the direct transmitted sound pressure level L dT Based on this, the upper limit value L of the reflected and transmitted sound sound pressure level is the sound pressure level of the reflected and transmitted sound that is emitted from the sound source 6, reflected in the sound source room 2, reaches the partition wall 5 or the partition floor 4, and then passes through the partition wall 5 or the partition floor 4 to reach the sound receiving room 3. pT A reflected and transmitted sound pressure level upper limit calculation unit 17 calculates the upper limit L pT Based on this, the reduction amount of sound-absorbing material 7 from the provisional installation amount, ΔS g and a sound-absorbing material installation amount calculation unit 18 that calculates the minimum installation amount of the sound-absorbing material 7 by calculating the above. According to the above-mentioned configuration, the appropriate amount of sound-absorbing material 7 to be installed can be calculated, and the construction cost of the architectural structure 1 can be reduced.

[0053] In addition, the reflected and transmitted sound sound pressure level upper limit calculation unit 17 calculates the sound receiving room allowable value L p From the direct transmitted sound pressure level L dT The upper limit L is calculated by subtracting the energy addition. pT Calculate. According to the above-mentioned configuration, the sound receiving room tolerance L p From the direct transmitted sound pressure level L dTThe upper limit L is calculated by subtracting the energy addition. pT In order to calculate the upper limit of the reflected and transmitted sound pressure level, L pT The sound receiving room tolerance L p and the direct transmitted sound pressure level L dT It can be appropriately calculated as the difference between

[0054] [First Modification of the Embodiment] Next, a first modified example of the method and device for calculating the amount of installation of sound-absorbing material shown as the embodiment above will be described. The method and device for calculating the amount of installation of sound-absorbing material in this first modified example differs from the method and device for calculating the amount of installation of sound-absorbing material in the embodiment above in that the minimum installation amount of sound-absorbing material 7 is calculated in each of a plurality of frequency bands, each of which is set as a candidate value for the installation amount, and the largest candidate value among the candidate values ​​is set as the minimum installation amount of sound-absorbing material 7. As the multiple frequency bands, it is preferable to use octave bands with center frequencies of, for example, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz, respectively. g Calculate the amount of reduction ΔS g The candidate value that has the smallest sound-absorbing material 7 remaining is the reduction amount ΔS g The minimum amount of sound absorbing material 7 to be installed is determined as follows. It goes without saying that the first modified example provides the same effects as the embodiment already described. According to the above-mentioned configuration, the sound pressure level of the sound reaching the sound receiving room 3 is set to the sound receiving room permissible value L p can be kept within.

[0055] [Second Modification of the Embodiment] Next, a second modified example of the method and device for calculating the amount of sound-absorbing material to be installed shown in the above embodiment will be described. The method and device for calculating the amount of sound-absorbing material to be installed in this second modified example differs from the method and device for calculating the amount of sound-absorbing material to be installed in the above embodiment in that a plurality of sound receiving rooms 3 are provided for the same sound source room 2, and the minimum amount of sound-absorbing material 7 to be installed in each of the plurality of sound receiving rooms 3 is calculated and each is set as a candidate value for the amount of installation, with the largest candidate value being set as the minimum amount of sound-absorbing material 7 to be installed. For example, in FIG. 1, sound receiving rooms 3A, 3B, and 3C are provided as sound receiving rooms 3 adjacent to the sound source room 2. In a case where the noise from the sound source room 2 must be taken into consideration in each of these sound receiving rooms 3A, 3B, and 3C, the reduction amount ΔS of the sound absorbing material 7 in each sound receiving room 3 is g Calculate the amount of reduction ΔS g The candidate value that has the smallest sound-absorbing material 7 remaining is the reduction amount ΔS g The minimum amount of sound absorbing material 7 to be installed is determined as follows. It goes without saying that the second modified example provides the same effects as the embodiment already described. According to the above-mentioned configuration, in any sound receiving room 3 adjacent to the sound source room 2, the sound pressure level of the sound reaching the sound receiving room 3 is controlled to be equal to or lower than the sound receiving room tolerance value L p can be kept within.

[0056] The method and device for calculating the amount of installation of sound-absorbing material of the present invention are not limited to the above-mentioned embodiments and modified examples described with reference to the drawings, and various other modified examples are possible within the technical scope. For example, in the above embodiment, the sound source room 2 is a machine room, but it is not limited to this as long as it is a room where noise can be generated. The sound source room 2 may be a dining room or a meeting space where multiple desks are divided by partitions. The sound source room 2 is not limited to a room in the architectural structure 1, and may be, for example, a lobby or a passageway. In the above embodiment, the reduction amount of the sound-absorbing material 7 from the provisional installation amount of the sound-absorbing material 7 is calculated as the minimum installation amount, but this is not limited to this. It goes without saying that the reduction amount of the sound-absorbing material 7 may be subtracted from the provisional installation amount of the sound-absorbing material 7, and the result may be calculated and output as the minimum installation amount. In the second modified example, the minimum amount of sound-absorbing material 7 to be installed for the multiple sound receiving rooms 3 is calculated, and the minimum amount of sound-absorbing material 7 to be finally adopted is determined so that the largest amount of sound-absorbing material 7 is installed, but this is not limited to the above. For example, the minimum amount of sound-absorbing material 7 to be installed for the sound receiving room 3 that is most required to be quiet among the multiple sound receiving rooms 3 may be calculated, and the minimum amount of sound-absorbing material 7 to be finally adopted may be determined based on this. In addition to the configuration of the above embodiment, for example, when the sound receiving room 3 is a large room, a sound receiving point may be set in the sound receiving room 3, and the direct transmitted sound pressure level and the reflected transmitted sound pressure level may be calculated so that the sound from the parting wall 5 or the parting floor 4 is attenuated depending on the distance from the parting wall 5 or the parting floor 4 to the sound receiving point. In addition, without departing from the spirit of the present invention, it is possible to select and discard the configurations given in the above embodiment and each modified example, or to change them to other configurations as appropriate. [Explanation of symbols]

[0057] 2 Sound source room 12 Database 3 Sound receiving room 13 Direct sound sound pressure level calculation section 4 Boundary floor 14 Existing condition reflected sound sound pressure level calculation section 5 Partition wall 15 Direct transmission sound pressure level calculation section 6 Sound source 16 Existing condition reflected and transmitted sound pressure level calculation section 7 Sound absorbing material 17 Reflected and transmitted sound pressure level upper limit calculation section 10 Sound absorbing material installation amount calculation device 18 Sound absorbing material installation amount calculation unit 11 Input section 19 Output section

Claims

1. A method for calculating the amount of sound absorbing material to be provided on the inner surface of a sound source room having a sound source, comprising the steps of: A provisional installation amount of the sound absorbing material to be provided in the sound source room has already been determined, Calculate the direct transmitted sound sound pressure level, which is the sound pressure level of the direct transmitted sound emitted from the sound source, directly reaching the partition wall or partition floor between the sound source room and the sound receiving room adjacent to the sound source room, and transmitting through the partition wall or partition floor to reach the sound receiving room; The direct transmission sound sound pressure level is subtracted by energy addition from the sound receiving room allowable value, which is the allowable value in the sound receiving room of the sound pressure level of the sound emitted from the sound source, transmitted through the partition wall or the partition floor, and reached the sound receiving room, to calculate an upper limit value of the reflected transmitted sound sound pressure level, which is the sound pressure level of the reflected transmitted sound emitted from the sound source, reflected within the sound source room, reaches the partition wall or the partition floor, and then transmits through the partition wall or the partition floor to reach the sound receiving room; Based on the upper limit value L pT , the area S S of the inner surface of the sound source room, the average sound absorption coefficient α S of the sound source room in the existing state in which the provisional installation amount of the sound absorbing material is installed, the room constant R s of the sound source room in the existing state, the sound absorption coefficient α g of the sound absorbing material, and the existing state reflected and transmitted sound sound pressure level L rT, which is the sound pressure level of the reflected and transmitted sound in the existing state, [0010] A method for calculating an installation amount of a sound-absorbing material, the method comprising: calculating a reduction amount ΔS g of the sound-absorbing material from the provisional installation amount by the above-mentioned method; and calculating a minimum installation amount of the sound-absorbing material.

2. Calculate a direct sound sound pressure level, which is the sound pressure level of a direct sound emitted from the sound source and directly reaching the partition wall or the partition floor; Calculate a sound pressure level of reflected sound in an existing state, which is a sound pressure level of a reflected sound that is emitted from the sound source, is reflected in the sound source room, and then reaches the partition wall or the partition floor in the existing state; Calculate the directly transmitted sound pressure level based on the difference between the direct sound sound pressure level and the sound transmission loss, which is the loss in sound pressure level when sound transmits through the partition wall or the partition floor; 2. The method for calculating an installation amount of sound-absorbing material according to claim 1, further comprising the step of calculating the reflected and transmitted sound pressure level in the existing state based on a difference between the reflected sound pressure level in the existing state and the sound transmission loss.

3. The sound absorbing material is formed in a plate shape, The method for calculating an installation amount of the sound-absorbing material according to claim 1 or 2, wherein the installation amount of the sound-absorbing material is an installation area.

4. 4. A method for calculating an installation amount of the sound-absorbing material according to claim 1, further comprising the steps of: calculating the minimum installation amount of the sound-absorbing material in each of a plurality of frequency bands; setting each of the calculated minimum installation amount candidates for the installation amount; and setting the largest of the candidate values ​​as the minimum installation amount of the sound-absorbing material.

5. A plurality of the sound receiving rooms are provided for the same sound source room, 5. A method for calculating an installation amount of sound-absorbing material according to claim 1, further comprising the steps of: calculating the minimum installation amount of the sound-absorbing material in each of a plurality of sound receiving rooms; setting each of the calculated minimum installation amount of the sound-absorbing material as a candidate value for the installation amount; and setting the largest candidate value among the candidate values ​​as the minimum installation amount of the sound-absorbing material.

6. Further comprising a database in which the purpose of use of the sound receiving room is linked to the sound receiving room tolerance, The method for calculating an amount of installation of a sound-absorbing material according to claim 1 , further comprising the step of: acquiring the sound-receiving room tolerance by referring to the database when the intended use of the sound-receiving room is selected.

7. An apparatus for calculating the amount of sound absorbing material to be provided on the inner surface of a sound source room having a sound source, A provisional installation amount of the sound absorbing material to be provided in the sound source room has already been determined, A direct transmission sound pressure level calculation unit that calculates a direct transmission sound sound pressure level, which is the sound pressure level of a direct transmission sound that is generated from the sound source, directly reaches a partition wall or a partition floor between the sound source room and a sound receiving room adjacent to the sound source room, and transmits through the partition wall or the partition floor to reach the sound receiving room; a reflected transmitted sound sound pressure level upper limit calculation unit that calculates an upper limit of a reflected transmitted sound sound pressure level, which is the sound pressure level of a reflected transmitted sound that is emitted from the sound source, reflects in the sound source room, reaches the partition wall or the partition floor, and reaches the sound receiving room through the partition wall or the partition floor, by subtracting the directly transmitted sound sound pressure level from a sound receiving room allowable value, which is an allowable value in the sound receiving room of the sound pressure level of the sound that is emitted from the sound source, transmits through the partition wall or the partition floor, and reaches the sound receiving room; Based on the upper limit value L pT , the area S S of the inner surface of the sound source room, the average sound absorption coefficient α S of the sound source room in the existing state in which the provisional installation amount of the sound absorbing material is installed, the room constant R s of the sound source room in the existing state, the sound absorption coefficient α g of the sound absorbing material, and the existing state reflected and transmitted sound sound pressure level L rT, which is the sound pressure level of the reflected and transmitted sound in the existing state, [0025] a sound-absorbing material installation amount calculation unit that calculates a reduction amount ΔS g of the sound-absorbing material from the provisional installation amount by calculating a minimum installation amount of the sound-absorbing material; A device for calculating the amount of sound-absorbing material to be installed, comprising:

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