WO2020188767A1 - Dispositif d'absorption acoustique - Google Patents

Dispositif d'absorption acoustique Download PDF

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Publication number
WO2020188767A1
WO2020188767A1 PCT/JP2019/011541 JP2019011541W WO2020188767A1 WO 2020188767 A1 WO2020188767 A1 WO 2020188767A1 JP 2019011541 W JP2019011541 W JP 2019011541W WO 2020188767 A1 WO2020188767 A1 WO 2020188767A1
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WO
WIPO (PCT)
Prior art keywords
sound absorbing
absorbing member
sound
film
installation surface
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Application number
PCT/JP2019/011541
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English (en)
Japanese (ja)
Inventor
誠 谷島
洋次 尾中
教将 上村
宏紀 福岡
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2019538536A priority Critical patent/JP6593835B1/ja
Priority to PCT/JP2019/011541 priority patent/WO2020188767A1/fr
Publication of WO2020188767A1 publication Critical patent/WO2020188767A1/fr

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the present invention relates to a sound absorbing device.
  • a perforated plate is opposed to the wall in the sound field, and the air layer existing between the wall in the sound field and the perforated plate is divided into a plurality of tubular voids by a partition wall.
  • a structure has been proposed (see, for example, Patent Document 1).
  • the present invention has been made to solve the above problems, and an object of the present invention is to obtain a sound absorbing device capable of improving sound absorbing performance and reducing costs.
  • the sound absorbing device has a porous member on which the first surface and the second surface are formed, a film-like body on which the first surface is formed, and a sound absorbing member on which the second surface overlaps the installation surface.
  • a fixing member for fixing the sound absorbing member to the installation surface is provided, and a plurality of through holes are formed in the film-like body, and the distance between each of the plurality of through holes is larger than the inner diameter of each through hole.
  • the film-like body and the first surface are recessed toward the installation surface at a holding position away from each of the plurality of through holes, and the sound absorbing member is fixed to the installation surface.
  • the sound absorbing performance can be improved and the cost can be reduced.
  • FIG. 1 It is a perspective view which shows the sound absorbing apparatus according to Embodiment 1 of this invention. It is sectional drawing along the line II-II of FIG. It is a schematic enlarged sectional view which shows the sound absorbing member of FIG. It is a model diagram which shows by modeling the sound absorbing member of FIG. 3 into a plurality of elements. It is a perspective view which shows the sound absorbing device which represented a plurality of virtual walls in the sound absorbing member of FIG. It is sectional drawing along the VI-VI line of FIG. It is a perspective view which shows the state which the plurality of pins of FIG. 1 are fixed to the installation surface. It is a graph which compared the relationship between the sound absorption coefficient ⁇ and the sound frequency F in Example and Comparative Example.
  • FIG. 1 is a perspective view showing a sound absorbing device according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG.
  • the sound absorbing device 1 is provided in a housing 2 of a device that is a noise source, such as a fan of an air conditioner and a hoisting machine of an elevator. The sound generated by the device that is a noise source is absorbed by the sound absorbing device 1.
  • the housing 2 has a bottom plate 21 and a side plate 22 provided along the outer peripheral portion of the bottom plate 21.
  • an opening 23 is formed by an edge portion of a side plate 22.
  • the bottom plate 21 is formed with an installation surface 24 exposed to the space inside the housing 2.
  • the sound absorbing device 1 is fixed to the installation surface 24. Further, the sound absorbing device 1 has a sound absorbing member 3 and a plurality of pins 4 as a plurality of fixing members for fixing the sound absorbing member 3 to the installation surface 24.
  • the sound absorbing member 3 has a porous member 5 and a perforated plate (MPP: MicroPerforated Panel) 6 overlapping the porous member 5.
  • MPP MicroPerforated Panel
  • the sound absorbing member 3 has a plate shape. Further, in this example, the thickness direction Z of the sound absorbing member 3 coincides with the direction orthogonal to the installation surface 24.
  • the porous member 5 is formed with a first surface 51 and a second surface 52 facing each other.
  • the first surface 51 and the second surface 52 face each other in the thickness direction Z of the porous member 5.
  • the perforated plate 6 overlaps the first surface 51.
  • the second surface 52 overlaps the installation surface 24.
  • the porous member 5 is a breathable member. Further, the porous member 5 is made of an elastic material. As a result, the porous member 5 can be elastically deformed by receiving an external force.
  • the porous member 5 a foam, a fiber aggregate, or the like is used.
  • the foam is a member formed into a foam by finely dispersing gas in rubber or resin.
  • Examples of the foam include urethane foam.
  • a fiber assembly is a member composed of fibers that are intertwined with each other. In the fiber aggregate, gaps as pores are formed between the fibers entwined with each other. Examples of the fiber aggregate include glass wool, rock wool, and non-woven fabric.
  • the perforated plate 6 is a film-like body in which a plurality of micropores 61 are formed as a plurality of through holes.
  • a film is used as the film-like body. Therefore, in this example, a film in which a plurality of micropores 61 are formed is used as the perforated plate 6.
  • the film material used for the perforated plate 6 examples include polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and the like. Further, in this example, the thickness of the perforated plate 6 is set to several tens of ⁇ m. Further, in this example, the ratio of the total area of the plurality of micropores 61 to the area of the perforated plate 6, that is, the opening ratio of the micropores 61 is about 0.05% to 16%. In this example, the cross-sectional shape of each micropore 61 is circular.
  • the plurality of micropores 61 are formed in the film at intervals from each other.
  • N fine holes 61 are located at equal intervals in the width direction X of the sound absorbing member 3
  • M fine holes 61 are located at equal intervals in the depth direction Y of the sound absorbing member 3.
  • the width direction X of the sound absorbing member 3 and the depth direction Y of the sound absorbing member 3 are both orthogonal to the thickness direction Z of the sound absorbing member 3.
  • the width direction X of the sound absorbing member 3 is a direction orthogonal to the depth direction Y of the sound absorbing member 3.
  • N and M are both integers of 1 or more.
  • the distance between each of the plurality of micropores 61 is larger than the inner diameter of each micropore 61. Therefore, the distance between the micropores 61 is larger than the inner diameter of the micropores 61 in both the width direction X and the depth direction Y of the sound absorbing member 3.
  • the distance between the two micropores 61 adjacent to each other is the size of the film-like body interposed between the two micropores 61.
  • Protrusions 62 protruding from the film-like body are formed on the peripheral edges of each of the micropores 61.
  • Each protrusion 62 projects from the film-like body to the side opposite to the porous member 5 side. Further, each protrusion 62 is arranged over the entire circumference of the microhole 61. As a result, the protrusion 62 surrounds the space inside the microhole 61.
  • micropores 61 are formed in the film by piercing the film with a needle. Further, in this example, a part of the film is extruded by a needle pierced by the film, and a deformed burr is formed on the film as a protrusion 62.
  • the center-to-center distance of each microhole 61 in the width direction X of the sound absorbing member 3 is defined as the microhole distance a in the width direction X.
  • the width dimension W1 of the perforated plate 6 is represented by N ⁇ a.
  • the distance between the centers of the micropores 61 in the depth direction Y of the sound absorbing member 3 is defined as the interpupillary distance b in the depth direction Y.
  • the depth dimension W2 of the perforated plate 6 is represented by M ⁇ b.
  • the thickness of the porous member 5 is defined as the thickness c of the porous member.
  • the total thickness of the perforated plate 6 and the protrusion 62 is defined as the fine hole forming thickness t.
  • the frequencies absorbed by the sound absorbing member 3 are the interpupillary distance a in the width direction X, the interpupillary distance b in the depth direction Y, the thickness c of the porous member, the inner diameter d of the micropores 61, and the micropore forming thickness t. It changes when at least one changes. That is, if at least one of the interpupillary distance a in the width direction X, the interpupillary distance b in the depth direction Y, the thickness c of the porous member, the inner diameter d of the micropores 61, and the micropore formation thickness t is reduced, The frequency of sound absorption by the sound absorbing member 3 changes to the high frequency side.
  • the frequency of sound absorption by the sound absorbing member 3 changes to the low frequency side.
  • the interpupillary distance a in the width direction X is made constant between the micropores 61, and the interpupillary distance in the depth direction Y. It is preferable to make b constant among the micropores 61.
  • the interpupillary distance a in the width direction X and the interpupillary distance b in the depth direction Y It is preferable to arrange a plurality of sound absorbing members 3 and fix them to the installation surface 24 so that at least one of the above is different for each sound absorbing member 3.
  • the interpupillary distance a in the width direction X may be the same as the interpupillary distance b in the depth direction Y, or may be different from the interpupillary distance b in the depth direction Y.
  • FIG. 3 is a schematic enlarged cross-sectional view showing the sound absorbing member 3 of FIG.
  • FIG. 4 is a model diagram showing the sound absorbing member 3 of FIG. 3 modeled into a plurality of elements.
  • the sound absorbing member 3 is represented by a vibration model of a one-degree-of-freedom system in which the mass 201 is connected to the installation surface 24 via the spring 202 and the damper 203. That is, in the vibration model of the sound absorbing member 3, the air inside the micropores 61 has a mass of 201.
  • the air layer in which the porous member 5 is arranged acts as a spring 202, and the viscous resistance when air passes through the micropores 61 and the porous member 5, that is, the flow of air.
  • the resistor acts as a damper 203.
  • the sound absorption coefficient ⁇ of the sound absorbing member 3 can be increased by adjusting the value of the viscous resistance of the damper 203.
  • the value of the viscous resistance of the damper 203 can be adjusted by the porous member 5. Therefore, the air flow resistance in the porous member 5 is an important parameter for increasing the sound absorption coefficient ⁇ .
  • the sound absorption coefficient ⁇ of the sound absorbing member 3 becomes maximum when the frequency of the sound incident from each of the fine holes 61 matches the resonance frequency of the perforated plate 6. Further, the sound absorption coefficient ⁇ of the sound absorbing member 3 decreases as the frequency of the sound incident from each of the micropores 61 deviates from the resonance frequency of the perforated plate 6.
  • the sound absorption coefficient ⁇ of the sound absorbing member 3 is represented by the following equation (1).
  • Z total is the total impedance of the perforated plate 6 and the porous member 5.
  • FIG. 5 is a perspective view showing a sound absorbing device 1 representing a plurality of virtual walls in the sound absorbing member 3 of FIG.
  • the sound absorbing member 3 includes a plurality of first virtual walls 71 orthogonal to the depth direction Y of the sound absorbing member 3 and a plurality of second virtual walls 72 orthogonal to the width direction X of the sound absorbing member 3 as a plurality of virtual walls 7. expressed.
  • the first virtual wall 71 and the second virtual wall 72 intersect each other at a position deviating from the position of each microhole 61.
  • Each virtual wall 7 is located between two microholes 61 adjacent to each other. Specifically, each first virtual wall 71 is located between two microholes 61 adjacent to each other in the depth direction Y of the sound absorbing member 3, and two microholes 61 adjacent to each other in the width direction X of the sound absorbing member 3. Each second virtual wall 72 is located between the two.
  • the distances from each of the two microholes 61 adjacent to each other to the virtual wall 7 are equal to each other. Specifically, the distances from each of the two microholes 61 adjacent to each other in the depth direction Y of the sound absorbing member 3 to the first virtual wall 71 are equal to each other, and 2 adjacent to each other in the width direction X of the sound absorbing member 3. The distances from each of the micropores 61 to the second virtual wall 72 are equal to each other.
  • a plurality of first virtual center lines 71a and a plurality of second virtual center lines 72a are set as a plurality of virtual center lines 7a.
  • Each first virtual center line 71a is set at a position where the perforated plate 6 and each first virtual wall 71 intersect.
  • Each second virtual center line 72a is set at a position where the perforated plate 6 and each second virtual wall 72 intersect.
  • each virtual center line 7a is located between two microholes 61 adjacent to each other. That is, each first virtual center line 71a is located between two microholes 61 adjacent to each other in the depth direction Y of the sound absorbing member 3, and between two microholes 61 adjacent to each other in the width direction X of the sound absorbing member 3. Each second virtual center line 72a is located at.
  • the distances from each of the two microholes 61 adjacent to each other to the virtual center line 7a are equal to each other. That is, the distances from each of the two microholes 61 adjacent to each other in the depth direction Y of the sound absorbing member 3 to the first virtual center line 71a are equal to each other, and the two adjacent microholes 61 in the width direction X of the sound absorbing member 3 are adjacent to each other. The distances from each of the micropores 61 to the second virtual center line 72a are equal to each other.
  • the plurality of pins 4 hold the sound absorbing member 3 toward the installation surface 24 at a holding position away from each of the plurality of microholes 61.
  • the holding position of each pin 4 is set on the virtual center line 7a.
  • the holding position of each pin 4 is set at the position of the intersection of the first virtual center line 71a and the second virtual center line 72a. Therefore, in this example, as shown in FIG. 1, the sound absorbing member 3 is separated from the center of the microhole 61 by a distance P1 which is 1/2 of the interpupillary distance a in the depth direction Y, and the sound is absorbed from the center of the microhole 61.
  • the holding position of the pin 4 is set at a position separated by a distance P2 of 1/2 of the interpupillary distance b in the width direction X of the member 3.
  • FIG. 6 is a cross-sectional view taken along the VI-VI line of FIG.
  • Each pin 4 has a rod-shaped penetrating portion 41 penetrating the sound absorbing member 3, a connecting portion 42 provided at one end of the penetrating portion 41, and a pressing portion 43 provided at the other end of the penetrating portion 41. are doing.
  • the penetrating portion 41 is arranged along the thickness direction Z of the sound absorbing member 3.
  • the penetration portion 41 is arranged on the intersection of the first virtual wall 71 and the second virtual wall 72.
  • connection portion 42 is connected to the installation surface 24.
  • the shape of the connecting portion 42 is a flange shape extending in the radial direction from one end of the penetrating portion 41. As a result, the connection state of the pin 4 with respect to the installation surface 24 is stabilized.
  • the holding portion 43 is exposed to the outside from the sound absorbing member 3. Further, the pressing portion 43 is a rod-shaped portion that projects laterally from the penetrating portion 41 from the other end portion of the penetrating portion 41. Each pin 4 presses the sound absorbing member 3 on the installation surface 24 by the pressing portion 43. In this example, as shown in FIG. 5, when the pin 4 is viewed along the thickness direction Z of the sound absorbing member 3, each holding portion 43 is arranged on the first virtual center line 71a.
  • the perforated plate 6 and the first surface 51 are recessed toward the installation surface 24 by being pressed by the pressing portion 43. That is, each pin 4 has the perforated plate 6 and the first surface 51 recessed toward the installation surface 24 by pressing the sound absorbing member 3 with the pressing portion 43.
  • the first surface 51 is recessed and elastically deformed to generate an elastic restoring force toward the perforated plate 6.
  • the perforated plate 6 receives the elastic restoring force of the porous member 5 to generate tension in the direction of the arrow in FIG. 6 orthogonal to the thickness direction of the perforated plate 6.
  • FIG. 7 is a perspective view showing a state in which the plurality of pins 4 of FIG. 1 are fixed to the installation surface 24.
  • the sound absorbing member 3 is manufactured in advance by superimposing the perforated plate 6 on the first surface 51 of the porous member 5.
  • the plurality of micropores 61 are formed by piercing the film with a needle.
  • a protrusion 62 formed by extruding a part of the film is formed on the peripheral edge of each of the micropores 61.
  • each protrusion 62 is perforated toward the side opposite to the porous member 5 side in order to prevent a gap from being formed between the porous member 5 and the perforated plate 6.
  • the plate 6 is superposed on the first surface 51 of the porous member 5.
  • each pin 4 is formed with a straight rod-shaped portion in which the penetrating portion 41 and the pressing portion 43 are not bent.
  • the length of the straight rod-shaped portion of each pin 4 is longer than the total length of the thickness of the porous member 5 and the thickness of the perforated plate 6.
  • the sound absorbing member 3 is placed on the installation surface 24.
  • the sound absorbing member 3 is pushed into the installation surface 24 while inserting the straight rod-shaped portions of the pins 4 in the order of the porous member 5 and the perforated plate 6.
  • the straight rod-shaped portion of each pin 4 penetrates the sound absorbing member 3, and a part of the straight rod-shaped portion of each pin 4 protrudes from the sound absorbing member 3.
  • the straight rod-shaped portion of each pin 4 pushes through the film of the perforated plate 6.
  • burrs that adhere to the outer peripheral surface of the straight rod-shaped portion of each pin 4 are formed on the film. Therefore, the contact area between the perforated plate 6 and each pin 4 is increased, and the perforated plate 6 is suppressed from slipping with respect to each pin 4.
  • the portion of the straight rod-shaped portion of each pin 4 protruding from the sound absorbing member 3 is bent.
  • the portion penetrating the sound absorbing member 3 becomes the penetrating portion 41, and the portion exposed to the outside from the sound absorbing member 3 and bent becomes the pressing portion 43.
  • the sound absorbing member 3 is fixed to the installation surface 24.
  • the state in which the perforated plate 6 and the first surface 51 are recessed toward the installation surface 24 is maintained by pressing the sound absorbing member 3 by the pressing portion 43. In this way, the sound absorbing device 1 is manufactured.
  • each pin 4 recesses the perforated plate 6 and the first surface 51 toward the installation surface 24 at a holding position away from each microhole 61, and fixes the sound absorbing member 3 to the installation surface 24. To do. Therefore, tension can be generated in the perforated plate 6, and the perforated plate 6 can be more reliably adhered to the porous member 5. As a result, the sound absorbing coefficient ⁇ of the sound absorbing member 3 can be improved, and the sound absorbing performance of the sound absorbing device 1 can be improved. Further, it is not necessary to use the porous member 5 as an expensive partition wall. Therefore, the cost of the sound absorbing device 1 can be reduced.
  • the relationship between the sound absorption coefficient ⁇ and the sound frequency F [Hz] was compared between the example and the comparative example.
  • the sound absorbing member 3 is fixed to the installation surface 24 by each pin 4, and the perforated plate 6 and the first surface 51 are recessed toward the installation surface 24 by each pin 4. .
  • the sound absorbing member 3 is fixed to the installation surface 24 without using each pin 4 in a state where there is a gap between the perforated plate 6 and the porous member 5.
  • the vertically incident sound absorption coefficient measured by the acoustic tube was defined as the sound absorption coefficient ⁇ .
  • FIG. 8 is a graph comparing the relationship between the sound absorption coefficient ⁇ and the sound frequency F between the example and the comparative example.
  • an embodiment is shown by a solid line
  • a comparative example is shown by a broken line.
  • the sound absorption coefficient ⁇ is larger than that in the comparative example. Therefore, it can be seen that the configuration in which the perforated plate 6 and the first surface 51 are recessed toward the installation surface 24 by each pin 4 contributes to the improvement of the sound absorbing performance of the sound absorbing device 1.
  • the sound absorbing member 3 is fixed to the installation surface 24 by a plurality of pins 4 penetrating the sound absorbing member 3. Therefore, the sound absorbing member 3 can be easily fixed to the installation surface 24.
  • the pressing position for pressing the sound absorbing member 3 by the pin 4 is set on the virtual center line 7a in which the distances from each of the two adjacent microholes 61 are equal. Therefore, it is possible to more reliably improve the sound absorption coefficient ⁇ of the sound absorbing device 1.
  • Example 1A where the holding position of the pin 4 is on the virtual center line 7a
  • Example 1B where the holding position of the pin 4 is closer to the microhole 61 than the position on the virtual center line 7a.
  • the relationship between the sound absorption coefficient ⁇ and the sound frequency F [Hz] was compared.
  • FIG. 9 is a graph comparing the relationship between the sound absorption coefficient ⁇ and the sound frequency F between Example 1A and Example 1B. As shown in FIG. 9, it can be seen that the sound absorption coefficient ⁇ of Example 1A is higher than the sound absorption coefficient ⁇ of Example 1B. From this, it can be seen that the configuration in which the holding position of the pin 4 is on the virtual center line 7a contributes to the improvement of the sound absorbing performance of the sound absorbing device 1. When the holding position of the pin 4 deviates from the virtual center line 7a and is close to the fine hole 61, the impedance inside the porous member 5 changes, so that the sound absorbing performance around the pin 4 tends to deteriorate. ..
  • a protrusion 62 is formed so as to project from the film-like body to the side opposite to the porous member 5 side. Therefore, it is possible to prevent the protrusion 62 from interposing between the perforated plate 6 and the porous member 5. As a result, the perforated plate 6 can be more reliably adhered to the porous member 5.
  • Example 1C in which the perforated plate 6 has no protrusion 62
  • Example 1D in which the height of the protrusion 62 is 0.1 [mm]
  • the height of the protrusion 62 is 0.2 [mm].
  • Example 1E the relationship between the sound absorption coefficient ⁇ and the sound frequency F [Hz] was compared.
  • FIG. 10 is a graph comparing the relationship between the sound absorption coefficient ⁇ and the sound frequency F between Example 1C, Example 1D, and Example 1E.
  • the frequency of the sound having the maximum sound absorbing coefficient shifts to the low frequency side as the height of the protrusion 62 increases.
  • the maximum sound absorbing coefficient of the sound absorbing member 3 increases as the height of the protrusion 62 increases.
  • the frequency of the sound having the maximum sound absorption coefficient can be shifted to the low frequency side where sound absorption is difficult. Further, the frictional energy between the air passing through the micropores 61 and the inner surface of the micropores 61 increases, and the vibration energy of sound can be easily converted into heat energy. Thereby, the maximum sound absorption coefficient of the sound absorbing member 3 can be improved. Therefore, by providing the protrusion 62 on the peripheral edge of each of the micropores 61, it is possible to further reliably improve the sound absorbing performance of the sound absorbing device 1.
  • the holding portions 43 of the two pins 4 adjacent to each other on the common virtual center line 7a are separated from each other.
  • the holding portions 43 of the two pins 4 adjacent to each other on the common virtual center line 7a may have a portion overlapping with each other.
  • the length of each holding portion 43 of the two pins 4 is d / 2. Will be longer than. By doing so, the range in which the sound absorbing member 3 is pressed by each pin 4 can be widened, and the sound absorbing performance of the sound absorbing device 1 can be further improved.
  • the holding portion 43 of each pin 4 is arranged along the width direction X.
  • the holding portion 43 of each pin 4 may be arranged along the depth direction Y.
  • the plurality of micropores 61 are located on a straight line along the width direction X and on a straight line along the depth direction Y.
  • the positions of the plurality of micropores 61 may be set in a staggered manner alternately deviated from a straight line along the depth direction Y in the width direction X.
  • the positions of the plurality of micropores 61 may be set in a staggered manner alternately deviated from a straight line along the width direction X in the depth direction Y.
  • FIG. 12 is a perspective view showing a sound absorbing device according to a second embodiment of the present invention. Further, FIG. 13 is a cross-sectional view taken along the line XIII-XIII of FIG.
  • the sound absorbing member 3 has an adhesive layer 8 interposed between the perforated plate 6 and the porous member 5.
  • the adhesive layer 8 adheres the perforated plate 6 to the first surface 51 of the porous member 5. Further, the adhesive layer 8 is arranged so as to avoid the fine holes 61 when the sound absorbing member 3 is viewed along the direction in which the perforated plate 6 and the porous member 5 overlap.
  • the ventilation resistance in each of the fine holes 61 becomes excessively large, and the deterioration of the sound absorbing performance of the sound absorbing member 3 is suppressed.
  • the adhesive layer 8 a double-sided adhesive tape, a resin-based adhesive, or the like is used. Other configurations are the same as those in the first embodiment.
  • an adhesive layer 8 is interposed between the perforated plate 6 and the first surface 51 of the porous member 5. Therefore, it is possible to prevent a gap from being formed between the perforated plate 6 and the first surface 51. As a result, the sound absorbing performance of the sound absorbing device 1 can be further improved.
  • the adhesive layer 8 is not interposed between the sample of the sound absorbing member 3 under conditions 1 to 3 in which the positional relationship of the adhesive layer 8 with respect to each micropore 61 is different from each other, and the perforated plate 6 and the porous member 5.
  • a sample of the sound absorbing member 3 of the condition 4 was prepared, and the sound absorbing coefficient ⁇ of each of the samples of the conditions 1 to 4 was measured.
  • FIG. 14 is an enlarged top view showing the positional relationship of the adhesive layer 8 with respect to the micropores 61 in the sample under condition 1.
  • the adhesive layer 8 has a plurality of adhesive portions 81 arranged along the depth direction Y.
  • the fine holes 61 and the adhesive portion 81 are alternately arranged in the width direction X.
  • a plurality of adhesive portions 81 are formed at positions sandwiching the micropores 61 from both sides in the width direction X. Have been placed.
  • the peripheral edge of the micropore 61 is in contact with the adhesive portions 81 on both sides.
  • the sound absorbing member 3 is fixed to the installation surface 24 without using each pin 4.
  • Other configurations are the same as those in the first embodiment.
  • FIG. 15 is an enlarged top view showing the positional relationship of the adhesive layer 8 with respect to the micropores 61 in the sample under condition 2.
  • the width of each adhesive portion 81 in the sample of condition 2 is 1/2 of the width of each adhesive portion 81 in the sample of condition 1.
  • each micropore 61 is not in contact with each adhesive portion 81.
  • Other configurations are the same as the sample of condition 1.
  • FIG. 16 is an enlarged top view showing the positional relationship of the adhesive layer 8 with respect to the micropores 61 in the sample under condition 3.
  • the adhesive portions 81 are arranged only at the positions specified in every other row among the positions of the plurality of adhesive portions 81 arranged in the width direction X in the sample of the condition 1.
  • the adhesive portion is formed only on one of both sides of each of the micropores 61 in the width direction X.
  • the peripheral edge portion of the micropore 61 is in contact with the adjacent adhesive portion 81.
  • Other configurations are the same as the sample of condition 1.
  • FIG. 17 is an enlarged top view showing the positions of the micropores 61 in the sample under condition 4.
  • the adhesive layer 8 is not interposed between the perforated plate 6 and the porous member 5.
  • Other configurations are the same as the sample of condition 1.
  • FIG. 18 is a graph comparing the relationship between the sound absorption coefficient ⁇ and the sound frequency F in each of the samples of conditions 1 to 4.
  • the sample from which the maximum sound absorption coefficient can be obtained is the sample of the condition 1.
  • the maximum sound absorption coefficient of the sample under condition 2 is lower than that of the sample under condition 1.
  • the sound absorption coefficient ⁇ is slightly wider than that in the sample under condition 1.
  • the sound absorption coefficient ⁇ is significantly lower than that of the samples of condition 1 and condition 2.
  • the sound absorbing performance of the sound absorbing device 1 is further improved by arranging the plurality of adhesive portions 81 at positions sandwiching the fine holes 61. It can be definitely improved.
  • the sound absorbing performance of the sound absorbing device 1 is further improved by arranging the adhesive portion 81 at a position where the adhesive portion 81 is in contact with the peripheral edge portion of each of the micropores 61 when the sound absorbing member 3 is viewed in the direction in which the perforated plate 6 overlaps the porous member 5. It can be definitely improved.
  • the sound absorption coefficient ⁇ of each of the samples under conditions 1 to 3 is higher than that of the sample under condition 4. Therefore, by applying the fixed configuration by each pin 4 of the first embodiment to each of the samples of the conditions 1 to 3, the sound absorbing performance of the sound absorbing device 1 can be further reliably improved. That is, the sound absorbing device 1 is formed by recessing the perforated plate 6 and the first surface 51 toward the installation surface 24 by each pin 4 and fixing the samples of the sound absorbing members 3 under the conditions 1 to 3 to the installation surface 24. The sound absorption performance of the above can be improved more reliably.
  • the arrangement of the plurality of adhesive portions 81 is not limited to the arrangement in the samples of conditions 1 to 3, and if the plurality of adhesive portions 81 are arranged while avoiding the micropores 61, the positions of the respective adhesive portions 81 are arranged. Whatever you do.
  • FIG. 19 is a perspective view showing a sound absorbing device according to a third embodiment of the present invention.
  • the sound absorbing member 3 is fixed to the installation surface 24 by a plurality of strip-shaped frames 9 as fixing members.
  • the frames 9 are arranged at intervals in the depth direction Y of the sound absorbing member 3.
  • Each frame 9 is connected to a pair of connecting portions 91 connected to the installation surface 24 on both sides of the sound absorbing member 3 in the width direction X, and a band-shaped pressing portion 92 for pressing the sound absorbing member 3 toward the installation surface 24. It has a pair of connecting portions 93 that connect each of the portions 91 to the pressing portion 92.
  • Each connecting portion 93 is arranged outside the side surface of the sound absorbing member 3.
  • One end of the holding portion 92 is connected to one connecting portion 91 via one connecting portion 93.
  • the other end of the holding portion 92 is connected to the other connecting portion 91 via the other connecting portion 93.
  • the pressing portion 92 is arranged along the width direction X of the sound absorbing member 3. Further, the pressing portion 92 presses the sound absorbing member 3 toward the installation surface 24 at a pressing position away from each of the fine holes 61.
  • the pressing position of the pressing portion 92 is set on the virtual center line 71a where the distances from each of the two adjacent microholes 61 in the depth direction Y are equal. As a result, in this example, the distance from the center of each microhole 61 to the pressing position of the pressing portion 92 is larger than the inner diameter of each microhole 61.
  • Each frame 9 has the perforated plate 6 and the first surface 51 recessed in the installation surface 24 by pressing the sound absorbing member 3 at the pressing position by the pressing portion 92.
  • the first surface 51 is recessed and elastically deformed to generate an elastic restoring force toward the perforated plate 6.
  • tension is generated in the perforated plate 6.
  • Each frame 9 is made of a material that does not bend easily. As a result, tension can be generated in the perforated plate 6 at the pressing position over the entire pressing portion 92.
  • a material constituting each frame 9 metal, resin, or the like is used. Examples of the metal used as the material of each frame 9 include aluminum and stainless steel. Other configurations are the same as those in the first embodiment.
  • the height of the frame 9 is determined by the dimensions of the connecting portion 93 from the connecting portion 91 to the holding portion 92.
  • the height of the frame 9 is set lower than the thickness direction of the sound absorbing member 3 when it is not fixed to the installation surface 24.
  • the perforated plate 6 and the first surface 51 are recessed toward the installation surface 24 by the band-shaped pressing portion 92. Therefore, the range in which the perforated plate 6 and the first surface 51 are recessed can be expanded as compared with the pin 4. As a result, the range in which tension is generated in the perforated plate 6 can be expanded, and the range in which the perforated plate 6 is brought into close contact with the porous member 5 can be expanded. Therefore, the sound absorbing coefficient ⁇ of the sound absorbing member 3 can be further reliably improved, and the sound absorbing performance of the sound absorbing device 1 can be further reliably improved.
  • the band-shaped pressing portion 92 is arranged on the virtual center line 71a.
  • the pressing position of the band-shaped pressing portion 92 is not limited to the position on the virtual center line 71a as long as it is a position avoiding each microhole 61.
  • the sound absorbing member 3 according to the first embodiment is fixed to the installation surface 24 by the frame 9.
  • the sound absorbing member 3 according to the second embodiment using the adhesive layer 8 may be fixed to the installation surface 24 by the frame 9.
  • FIG. 20 is a perspective view showing a sound absorbing device according to a fourth embodiment of the present invention.
  • the sound absorbing member 3 is fixed to the installation surface 24 by a cover 10 as a fixing member that covers the sound absorbing member 3.
  • the cover 10 has a pair of connecting portions 101 connected to the installation surface 24 on both sides of the sound absorbing member 3 in the depth direction Y, and a pair of plate-shaped pressing portions 102 that press the sound absorbing member 3 toward the installation surface 24. It has a pair of connecting portions 103 that connect each of the portions 101 to the pressing portion 102.
  • Each connecting portion 103 is arranged outside the side surface of the sound absorbing member 3.
  • One end of the pressing portion 102 is connected to one connecting portion 101 via one connecting portion 103.
  • the other end of the pressing portion 102 is connected to the other connecting portion 101 via the other connecting portion 103.
  • An opening 104 is formed in the pressing portion 102.
  • the pressing portion 102 is arranged at the pressing position in a state where the plurality of micropores 61 are exposed through the opening 104.
  • the frame-shaped range surrounding the periphery of the plurality of micropores 61 is the pressing position of the pressing portion 102.
  • the pressing portion 102 presses the sound absorbing member 3 toward the installation surface 24 at a pressing position away from each of the fine holes 61.
  • the distance from the center of each microhole 61 to the pressing position of the pressing portion 102 that is, the distance from the center of each microhole 61 to the inner peripheral portion of the opening 104 is larger than the inner diameter of each microhole 61. It has become.
  • the cover 10 has the perforated plate 6 and the first surface 51 recessed toward the installation surface 24 by pressing the sound absorbing member 3 at the pressing position by the pressing portion 102.
  • the first surface 51 is recessed and elastically deformed to generate an elastic restoring force toward the perforated plate 6.
  • tension is generated in the perforated plate 6.
  • the material constituting the cover 10 is the same as the material constituting the frame 9 of the second embodiment. Other configurations are the same as those in the first embodiment.
  • the height of the cover 10 is determined by the dimensions of the connecting portion 103 from the connecting portion 101 to the holding portion 102.
  • the height of the cover 10 is set lower than the thickness direction of the sound absorbing member 3 when it is not fixed to the installation surface 24.
  • Such a sound absorbing device 1 has a plate-shaped pressing portion 102 having an opening 104 formed therein. Further, the pressing portion 102 is arranged at the pressing position in a state where the plurality of micropores 61 are exposed through the opening 104. Therefore, the range in which the perforated plate 6 and the first surface 51 are recessed can be further expanded. As a result, the range in which tension is generated in the perforated plate 6 can be expanded, and the range in which the perforated plate 6 is brought into close contact with the porous member 5 can be expanded. Therefore, the sound absorbing coefficient ⁇ of the sound absorbing member 3 can be further reliably improved, and the sound absorbing performance of the sound absorbing device 1 can be further reliably improved.
  • the sound absorbing member 3 can be easily and more reliably fixed to the installation surface 24 even when the aspect ratio of the sound absorbing member 3 is large. Can be done.
  • the sound absorbing member 3 according to the first embodiment is fixed to the installation surface 24 by the cover 10.
  • the sound absorbing member 3 according to the second embodiment using the adhesive layer 8 may be fixed to the installation surface 24 by the cover 10.
  • 1 Sound absorbing device 3 Sound absorbing member, 4 Pin (fixing member), 5 Porous member, 6 Perforated plate (membrane-like body), 7a Virtual center line, 8 Adhesive layer, 9 Frame (fixing member), 10 Cover (fixing member) ), 24 Installation surface, 41 Penetration part, 43 Holding part, 51 First surface, 52 Second surface, 61 Microhole (through hole), 62 Protrusion part, 71a 1st virtual center line, 72a 2nd virtual center line, 81 adhesive part, 92 holding part, 102 holding part, 104 opening.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)

Abstract

L'invention concerne un équipement d'absorption acoustique pourvu d'un matériau d'absorption acoustique et d'une partie de fixation servant à fixer le matériau d'absorption acoustique à une surface de montage. Le matériau d'absorption acoustique comprend un matériau poreux présentant une première surface et une seconde surface, et un corps membraneux chevauchant la première surface. Le corps membraneux comporte une pluralité de trous débouchants. La distance entre chacun de la pluralité de trous débouchants est supérieure au diamètre interne de chaque trou débouchant. La partie de fixation enfonce le corps membraneux et la première surface vers la surface de montage à une position de compression distante de chacun de la pluralité de trous débouchants, fixant ainsi le matériau d'absorption acoustique à la surface de montage.
PCT/JP2019/011541 2019-03-19 2019-03-19 Dispositif d'absorption acoustique WO2020188767A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2019538536A JP6593835B1 (ja) 2019-03-19 2019-03-19 吸音装置
PCT/JP2019/011541 WO2020188767A1 (fr) 2019-03-19 2019-03-19 Dispositif d'absorption acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/011541 WO2020188767A1 (fr) 2019-03-19 2019-03-19 Dispositif d'absorption acoustique

Publications (1)

Publication Number Publication Date
WO2020188767A1 true WO2020188767A1 (fr) 2020-09-24

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PCT/JP2019/011541 WO2020188767A1 (fr) 2019-03-19 2019-03-19 Dispositif d'absorption acoustique

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JP (1) JP6593835B1 (fr)
WO (1) WO2020188767A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642951A (en) * 1984-12-04 1987-02-17 Fam Tile Restoration Services, Ltd. Suspended ceiling tile system
KR101897467B1 (ko) * 2018-04-26 2018-09-12 조규현 댐핑 시트와 반파장 기주공명 부재를 적용한 고성능 흡음형 방음판

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4642951A (en) * 1984-12-04 1987-02-17 Fam Tile Restoration Services, Ltd. Suspended ceiling tile system
KR101897467B1 (ko) * 2018-04-26 2018-09-12 조규현 댐핑 시트와 반파장 기주공명 부재를 적용한 고성능 흡음형 방음판

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JPWO2020188767A1 (ja) 2021-04-08
JP6593835B1 (ja) 2019-10-23

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