CN113593512A - Multi-cavity composite sound absorption structure - Google Patents
Multi-cavity composite sound absorption structure Download PDFInfo
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- CN113593512A CN113593512A CN202110772390.4A CN202110772390A CN113593512A CN 113593512 A CN113593512 A CN 113593512A CN 202110772390 A CN202110772390 A CN 202110772390A CN 113593512 A CN113593512 A CN 113593512A
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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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/1752—Masking
Abstract
The invention discloses a multi-cavity composite sound absorption structure which comprises a cavity, wherein a plurality of partition plates are arranged in the cavity, the inner cavity of the cavity is divided into a plurality of sound absorption unit cavities which are arranged in parallel along the axial direction of the cavity by the partition plates, a first micro-perforated plate covers the top of the cavity, a bottom plate is arranged at the bottom of each sound absorption unit cavity, and the depths of the sound absorption unit cavities are different. The multi-cavity composite sound absorption structure has the advantages of simple structure, convenience in installation, light weight, small occupied space and wide sound absorption frequency band. The multi-cavity composite sound absorption structure can conveniently regulate and control the structural parameters of each unit according to the required sound absorption frequency band in practical application, and obtains the continuous and stable sound absorption effect in the target frequency band.
Description
Technical Field
The invention relates to the technical field of sound absorption structures, in particular to a multi-cavity composite sound absorption structure.
Background
Along with the deep mind of environmental protection consciousness, the negative influence brought by noise arouses wide attention, especially in the field of transportation, along with the promotion of train speed, noise level and vibration energy level rise thereupon, influence the riding comfort of passengers in the carriage, especially low frequency noise can influence people's central nervous function, cause irreversible damage to auditory system, still can lead to the precision instruments to malfunction, even stop work, threaten people's life and property safety. Therefore, sound absorption and noise reduction are important for research.
The process of sound absorption is an energy dissipation process, and the currently used sound absorption materials mainly comprise two types: one is porous material, sound wave enters the interior of the material along a large number of tiny and communicated pore diameters, and generates heat loss and viscous loss by friction with pore walls, the mechanism determines that the porous material is commonly used for high-frequency sound absorption, and if the aim of low-frequency sound absorption is to realize, a large thickness (the thickness basically corresponds to 1/4 of the sound wave wavelength) is needed; the other is a micro-perforated plate with a back cavity, when sound waves are incident, air in the micro-holes and air in the cavity generate resonance to lose sound energy, a resonance sound absorption peak value can appear at a lower frequency, and the micro-perforated plate is suitable for middle and low frequency sound absorption.
However, the conventional microperforated panel has only one sound absorption peak, cannot maintain high-efficiency sound absorption in a wide frequency band, and is difficult to cope with a complicated sound source in practice. Therefore, it is difficult to achieve full-band sound absorption effect by using a single sound absorption material, and a reasonable composite mode is required to achieve effective sound absorption in a wide frequency band.
Disclosure of Invention
The invention mainly aims to provide a multi-cavity composite sound absorption structure which is simple in structure, convenient to install, light in weight, small in occupied space, wide in sound absorption frequency band and good in sound absorption effect.
In order to achieve the purpose, the invention provides a multi-cavity composite sound absorption structure which comprises a cavity, wherein a plurality of partition plates are arranged in the cavity, the inner cavity of the cavity is divided into a plurality of sound absorption unit cavities which are arranged in parallel along the axial direction of the cavity by the partition plates, the top of the cavity is covered with a first micro-perforated plate, the bottom of each sound absorption unit cavity is provided with a bottom plate, and the depths of the sound absorption unit cavities are different.
Furthermore, each sound absorption unit cavity is internally provided with at least one second micro-perforated plate, the second micro-perforated plates divide the sound absorption unit cavity into a plurality of cavities with different depths, and the depths of the cavities in the same layer in the plurality of sound absorption unit cavities are different.
Further, the depths of the chambers in the same layer of the sound absorption unit cavities are sequentially increased or sequentially decreased.
Furthermore, the inner cavity of the cavity is divided into a plurality of sound absorption unit cavities with equal cross sectional areas by the plurality of partition plates, and the sound wave incident areas of the sound absorption unit cavities are the same.
Furthermore, a group of perforations are formed in the first micro-perforated plate corresponding to each sound absorption unit cavity, and the opening rate of the first micro-perforated plate corresponding to the sound absorption unit cavities is not completely consistent.
Further, the second micro-perforated plate has an open area ratio smaller than that of a region of the first micro-perforated plate corresponding to the sound-absorbing unit chamber.
Furthermore, a slit is arranged on the outer side of the cavity along the circumferential direction of the cavity, and porous materials are filled in the slit.
Further, the space below the bottom plate at the bottom of each sound absorption unit cavity is filled with porous materials.
Further, the porous material filled in the slit is connected with the porous material filled in the space below the bottom plate.
Compared with the prior art, the invention has the following beneficial effects:
according to the multi-cavity composite sound absorption structure, a plurality of resonators with sequentially increasing resonant frequencies are connected in parallel to obtain a multi-cavity coupling resonator for continuous broadband sound absorption; the slits are arranged at the periphery of the multi-cavity coupling resonator and filled with porous materials, so that the sound absorption bandwidth and the sound absorption coefficient are further improved, and the sound absorption effect is more stable. The porous material accounts for a small proportion in the exposed incident surface, and most of the porous material is protected by the micro-perforated plate with higher rigidity, so that the porous material is prevented from being damaged easily and the structure has heat-insulating and moisture-proof performances. The structure occupies small space, and the porous material in the slit is connected with the porous material below the bottom plate in series, so that the limited space is fully utilized. The multi-cavity composite sound absorption structure fully exerts the unique advantages of two materials, effectively avoids respective defects, and has the advantages of excellent sound absorption performance, flexibility and strong designability. The multi-cavity composite sound absorption structure is simple in structure, convenient to install, light in weight, small in occupied space, wide in sound absorption frequency band and good in sound absorption effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is an overall view of the multi-cavity composite sound absorbing structure of the present invention.
FIG. 2 is an exploded view of the multi-cavity composite sound absorbing structure of the present invention.
FIG. 3 is a schematic structural view of a multiple cavity coupled resonator in a multiple cavity composite sound absorbing structure of the present invention.
FIG. 4 is a schematic structural view of the cellular material in the multi-cavity composite sound absorbing structure of the present invention.
FIG. 5 is a schematic representation of the construction of a single resonator in the multi-cavity composite sound absorbing structure of the present invention.
Fig. 6 is a sound absorption effect curve of eight resonators (corresponding to eight broken lines in the figure) in the multi-cavity composite sound absorption structure and a sound absorption effect curve of eight resonators in parallel (corresponding to a solid line in the figure).
Fig. 7 is a graph showing the sound absorption effect before (dotted line) and after (solid line) the porous material is filled in the multi-cavity coupled resonator.
FIG. 8 is a schematic top view of a plurality of multi-cavity composite sound absorbing structures of the present invention arranged in an array.
Fig. 9 is a schematic view of the multi-chamber composite sound absorbing structure of the present invention applied to a train car.
Wherein the figures include the following reference numerals:
1. a cavity; 2. a partition plate; 3. a sound absorption unit cavity; 4. a first microperforated panel; 5. a base plate; 6. a second microperforated panel; 7. a porous material; 8. a rigid support; 31. a chamber; 41. and (6) perforating.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The use of "first," "second," and similar terms in the description and in the claims of the present application do not denote any order, quantity, or importance, but rather the intention is to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" and "coupled" and the like are not restricted to direct connections, but may be indirectly connected through other intermediate connections. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
The "resonator" in the present invention means a single sound-absorbing structural unit composed of the sound-absorbing unit chamber 3, the microperforated panel, the bottom plate 5, and the like, and has a structure as shown in fig. 5. A plurality of resonators are connected in parallel to form a multi-cavity coupled resonator. The "multi-cavity coupled resonator" refers to a sound absorbing structure in which a plurality of resonators are connected in parallel and the porous material 7 is not filled, and the structure thereof is as shown in fig. 3. The multi-cavity coupled resonator is filled with the porous material 7 to form the multi-cavity composite sound absorption structure of the invention.
Referring to fig. 1 to 9, a multi-cavity composite sound absorption structure according to an embodiment of the present invention mainly includes a cavity 1, wherein a plurality of partition boards 2 are disposed in the cavity 1, and the partition boards 2 partition an inner cavity of the cavity 1 into a plurality of sound absorption unit cavities 3 arranged in parallel along an axial direction of the cavity 1; a first micro-perforated plate 4 is covered on the top of the cavity 1; the bottom of each sound absorption unit cavity 3 is provided with a bottom plate 5; the depth of each sound-absorbing unit chamber 3 is different (the height of the bottom plate 5 is different).
In the multi-cavity composite sound absorption structure, the inner cavity of the cavity 1 is divided into a plurality of sound absorption unit cavities 3 which are arranged in parallel along the axial direction of the cavity 1 by a plurality of partition plates 2, a first micro-perforated plate 4 is covered on the top of the cavity 1, and the depths of the sound absorption unit cavities 3 are different; a single resonator is formed by the sound absorption unit cavity 3, the micro-perforated plate, the bottom plate 5 and the like, a plurality of resonators with different resonant frequencies are connected in parallel, a multi-cavity coupling resonator with broadband sound absorption is obtained, and the sound absorption effect of the sound absorption structure is effectively improved. The multi-cavity composite sound absorption structure is simple in structure, convenient to install, light in weight, small in occupied space and wide in sound absorption frequency band.
In the embodiment, at least one second micro-perforated plate 6 is arranged in each sound absorption unit cavity 3, and the second micro-perforated plate 6 divides the sound absorption unit cavity 3 into a plurality of chambers 31 which are arranged up and down; the depths of the chambers 31 in the same sound absorption unit cavity 3 are different; the depth of the same layer of the chamber 31 in the plurality of sound absorption unit cavities 3 is different. That is, in the same sound absorption unit cavity 3, the depth of the upper chamber 31 is different from that of the lower chamber 31; in the plurality of sound absorption unit cavities 3, the depth of the chambers 31 located at the upper layer is different, and the depth of the chambers 31 located at the lower layer is different. Thus, a plurality of stages (multilayer) resonant cavities (cavities 31) with different sound absorption peak values are formed in the sound absorption structure, and each stage resonant cavity comprises a plurality of resonant cavities with different sound absorption peak values; the coupled sound absorption coefficient can be maintained at a high level without excessive oscillation.
In the present embodiment, the depths of the chambers 31 of the same layer in the plurality of sound-absorbing unit chambers 3 are sequentially increased or sequentially decreased. That is, in the same layer of the cavity 31, the depth of the cavity 31 is changed gradually, and a plurality of resonators with sequentially increasing resonance frequency are formed in parallel, so that a multi-cavity coupled resonator with continuous broadband sound absorption is obtained. The inner cavity of the cavity 1 is divided into a plurality of sound absorption unit cavities 3 with equal cross sectional areas by the plurality of partition plates 2, so that the sound wave incident areas of the sound absorption unit cavities 3 are the same.
In this embodiment, a set of perforations 41 is formed on the first microperforated panel 4 corresponding to each sound-absorbing unit cavity 3, and the opening ratio (the ratio of the area of the perforations 41 to the total area of the perforated panel) of the area of the first microperforated panel 4 corresponding to a plurality of sound-absorbing unit cavities 3 is not completely uniform. With this arrangement, by setting the opening ratio of the areas of the first micro-perforated plate 4 corresponding to the plurality of sound-absorbing unit chambers 3 to be not completely uniform and the depth of each chamber 31 to be different, when the frequency of the incident sound wave is between the two resonance frequencies, both resonators will have strong correspondence and strong coupling, and acoustically couple and integrate into one body, thereby obtaining a continuous broadband sound-absorbing effect. The problem that the sound absorption frequency band of the traditional resonance sound absorber is narrow is solved, and the problem that the sound absorption valley value is easy to occur when the traditional micro-perforated plate is simply placed together is also solved.
Further, in the present embodiment, the second microperforated panel 6 has an opening ratio smaller than that of the area of the first microperforated panel 4 corresponding to the sound-absorbing unit chamber 3. The resonance frequency of the lower chamber 31 is different from that of the upper chamber 31, and the sound absorption frequency bandwidth of the composite sound absorption structure is further improved.
In the present embodiment, the outer side of the cavity 1 is provided with an annular slit (not shown in the figure) along the circumferential direction of the cavity 1, and the slit is filled with the porous material 7. By arranging the composite sound absorption structure, the multi-cavity coupled resonator is combined with the porous material 7 to form the sound absorption device with the composite two dissipation mechanisms. The porous material 7 has excellent sound absorption effect on high-frequency noise, and the porous material 7 is filled in the annular slit of the cavity 1, so that the sound absorption effect of the porous material 7 at high frequency (the porous material 7 directly contacts with incident sound waves) is not influenced, and the sound absorption bandwidth and the sound absorption coefficient are remarkably improved on the basis of medium and low frequency sound absorption of the multi-cavity coupled resonator, so that the sound absorption coefficient curve is integrally improved, and the sound absorption effect is more stable.
Further, in this embodiment, the lower space of the bottom plate 5 at the bottom of each sound absorption unit cavity 3 is filled with the porous material 7, and the porous material 7 filled in the slits is connected with the porous material 7 filled in the lower space of the bottom plate 5, so that the limited space of the sound absorption structure is fully utilized, and the sound absorption effect of the sound absorption structure is further improved. The sound absorption effect curves of the multi-cavity coupled resonator before and after the porous material 7 is filled are shown in fig. 7.
One specific example of the multi-cavity composite sound absorbing structure is as follows:
eight baffles 2 separate the inner chamber of cavity 1 into eight sound absorption unit cavities 3 along the axial parallel arrangement of cavity 1, and the 5 high diverse of bottom plates of eight sound absorption unit cavities 3 all are provided with a second micropunch plate 6 in every sound absorption unit cavity 3. The depth of each chamber 31, the opening ratio of the area of the first microperforated panel 4 corresponding to each sound-absorbing unit chamber 3, and the opening ratio of each second microperforated panel 6 are shown in table 1 below.
TABLE 1 structural parameters of the respective resonators
In Table 1, D1 represents the depth of each upper chamber 31, D2 represents the depth of each lower chamber 31, and the perforation rate σ represents1The aperture ratio, i.e., the perforation ratio σ, of the area corresponding to the first microperforated panel 4 for each sound-absorbing unit chamber 32The opening ratio of each second microperforated panel 6.
In the multi-cavity composite sound absorption structure, eight resonators with sequentially increasing resonant frequencies are connected in parallel to form a multi-cavity coupling resonator, the sound wave incident areas of the eight resonators are the same, but the cavity depth and the perforation rate of each cavity 31 in each sound absorption unit cavity 3 are different. Fig. 5 is a schematic diagram of a single resonator. The resonant frequencies of the resonators are sequentially increased by adjusting the cavity depths D1 and D2 and the perforation rates, and each resonator acts on different resonant frequencies in the design sequence from low frequency to high frequency. The eight sound absorption unit cavities 3 are symmetrically arranged along the central axis to obtain the multi-cavity coupling resonator. The slits and the bottom space at the periphery of the resonator are filled with porous materials 7 connected in series to form the sound absorption device under two dissipation mechanisms.
The sound absorption effect curves of the eight resonators (when the porous material 7 is not filled) acting independently in the multi-cavity composite sound absorption structure correspond to the eight broken lines in fig. 6; the sound absorption effect curve when eight resonators are connected in parallel to form a multi-cavity coupled resonator (not filled with the porous material 7) and then act together corresponds to the solid line in fig. 6. As can be seen from fig. 6, the sound absorption effect is significantly improved when eight resonators are connected in parallel.
Fig. 7 is a sound absorption effect curve before the multichambered coupled resonator is filled with the porous material 7 and after the porous material 7 is filled with the multichambered coupled resonator, in which a dotted line shows the sound absorption effect curve before the multichambered coupled resonator is filled with the porous material 7 and a solid line shows the sound absorption effect curve after the multichambered coupled resonator is filled with the porous material 7. As can be seen from fig. 7, the sound absorption effect of the multi-cavity composite sound absorption structure is obviously improved after the porous material 7 is filled.
Referring to fig. 8 and 9, a plurality of multi-cavity composite sound absorbing structures of the present invention are arranged in an array, and adjacent multi-cavity composite sound absorbing structures are connected by a rigid support 8, so that the mechanical strength of each multi-cavity composite sound absorbing structure is improved. In practice, other necessary devices in the cabin may be mounted on the rigid support 8. As shown in fig. 9, for an example of the application of the sound absorption device in a train compartment, the sound absorption device is installed on a compartment wall, after noise sound waves generated at a sound source are emitted to the multi-cavity composite sound absorption structure, most sound energy is absorbed by the multi-cavity composite sound absorption structure, and the reflection of the sound waves in the compartment is rapidly weakened. The wall thickness of the carriage generally has a space of 0.4m-0.6m, the total thickness of the structure of the invention is only 0.062m, the occupied space is small, and the invention meets the requirement of light weight of the train.
The principle of the multi-cavity composite sound absorption structure of the present invention is as follows:
when the multi-cavity composite sound absorption structure is excited by sound waves, the gas in the cavity at the back of the sound absorption unit cavity 3 is forcibly compressed, and the compressed air generates acting force on the micropores on the micro-perforated plate when being recovered, so that the air in the pores vibrates to dissipate the energy of the sound waves. Different structural parameters of the chamber 31 of the microperforated panel require different frequencies of acoustic excitation. Two-order resonance frequency is formed by designing eight sound absorption unit cavities 3 and two layers of micro-perforated plates to increase gradually in sequence, 16 sound absorption peak values are generated in total, the first 8 sound absorption peak values are generated by first-order resonance, the last 8 sound absorption peak values are generated by second-order resonance, and meanwhile, the sound absorption coefficient peak values of all the units are designed to be maintained at a level of 0.7-0.8, so that the sound absorption coefficient after coupling is ensured to be maintained at a higher level without excessive oscillation, as shown in fig. 6.
Resonators with different resonant frequencies are connected in parallel, when the incident sound wave frequency is between the two resonant frequencies, the two resonator units have strong correspondence and strong coupling, and are acoustically connected into a whole, so that a continuous broadband sound absorption effect is obtained, as shown in fig. 6. The problem that the sound absorption frequency band of the traditional resonance sound absorber is narrow is solved, and the problem that the sound absorption valley value is easy to occur when the traditional micro-perforated plate is simply placed together is also solved.
Slits are provided in the periphery of the multi-cavity coupled resonator and filled with a lightweight porous material 7. The slit-filling method overcomes the problem of poor mechanical properties of the porous material 7 because the array of sound absorbers is to be installed in practical use. The sound absorption mechanism of the porous material 7 determines that the porous material has good sound absorption effect on high-frequency noise, and the porous material 7 is arranged in the gap, so that the sound absorption effect of the porous material 7 at high frequency is not influenced (the porous material 7 directly contacts with incident sound waves), and the sound absorption bandwidth and the sound absorption coefficient are obviously improved on the basis of medium and low frequency sound absorption of the multi-cavity coupling resonator, the sound absorption coefficient curve is integrally improved, and the sound absorption effect is more stable.
Generally speaking, the multi-cavity composite sound absorption structure of the invention connects in parallel a plurality of resonators with sequentially increasing resonant frequency to obtain a multi-cavity coupled resonator for continuous broadband sound absorption; and slits are arranged at the periphery of the multi-cavity coupling resonator and filled with porous materials 7, so that the sound absorption bandwidth and the sound absorption coefficient are further improved, and the sound absorption effect is more stable. The porous material 7 occupies a small proportion in the exposed incident plane, and most of the porous material 7 is protected by the micro-perforated plate with higher rigidity, so that the problem that the porous material 7 is easy to damage is solved, and the structure has the performance of heat preservation and moisture resistance. The total thickness of the structure is reduced to the depth sub-wavelength range, the occupied space is small, the porous material 7 in the slit is connected with the porous material 7 below the bottom plate 5 in series, and the limited space is fully utilized. The invention gives full play to the unique advantages of the two materials, effectively avoids the respective disadvantages and obtains the sound absorption device with excellent sound absorption performance, flexibility and strong designability.
The multi-cavity composite sound absorption structure has the advantages of simple structure, convenience in installation, light weight, small occupied space and wide sound absorption frequency band. More importantly, due to the vivid visual association between the sound absorption units and the coupling results, the structural parameters of each unit can be conveniently regulated and controlled according to the required sound absorption frequency band in practical application, and the continuous and stable sound absorption effect in the target frequency band is obtained. Therefore, the device has great application potential in the field of sound absorption and noise reduction.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. For example, the invention only proposes the case of coupling two layers of microperforated panels as sound absorbing units, and the number of layers of microperforated panels can be further increased subsequently. Keep under the unchangeable condition of total thickness of structure, along with the increase of the microperforated panel number of piles, the resonance peak number that sound absorption unit produced increases, then the coupling result will be become by more peak values, and the sound absorption frequency band will be further widened, and the sound absorption coefficient curve will be more steady, has better sound absorption effect.
Claims (9)
1. The utility model provides a compound sound absorbing structure of multicavity, includes cavity (1), its characterized in that, be equipped with polylith baffle (2) in cavity (1), polylith baffle (2) will the inner chamber of cavity (1) is separated into and is followed a plurality of sound absorption unit chamber (3) of the axial parallel arrangement of cavity (1), the top lid of cavity (1) has closed first microperforated panel (4), every the bottom in sound absorption unit chamber (3) all is equipped with a bottom plate (5), every the degree of depth diverse in sound absorption unit chamber (3).
2. The multi-cavity composite sound absorbing structure according to claim 1, wherein each sound absorbing unit cavity (3) is provided with at least one second micro-perforated plate (6), the second micro-perforated plate (6) divides the sound absorbing unit cavity (3) into a plurality of cavities (31) which are arranged up and down and have different depths, and the cavities (31) in the same layer in the sound absorbing unit cavities (3) have different depths.
3. A multiple cavity composite sound absorbing structure according to claim 2, wherein the depth of the chambers (31) of the same layer in a plurality of the sound absorbing unit cavities (3) is sequentially increased or sequentially decreased.
4. The multi-cavity composite sound absorbing structure according to claim 2, wherein the partition plates (2) divide the inner cavity of the cavity (1) into a plurality of sound absorbing unit cavities (3) having the same cross-sectional area, and the sound wave incident areas of the sound absorbing unit cavities (3) are the same.
5. The multi-cavity composite sound absorbing structure according to claim 2, wherein the first microperforated panel (4) is provided with a set of perforations (41) corresponding to each of the sound absorbing unit cavities (3), and the area of the first microperforated panel (4) corresponding to a plurality of the sound absorbing unit cavities (3) has an aperture ratio that is not completely uniform.
6. A multi-cavity composite sound absorbing structure according to claim 5, wherein the second microperforated panel (6) has an open porosity which is less than the open porosity of the corresponding region of the first microperforated panel (4) of the sound absorbing cell cavity (3).
7. A multi-cavity composite sound absorbing structure according to any one of claims 1 to 6, wherein a slit is formed on the outer side of the cavity (1) along the circumferential direction of the cavity (1), and the slit is filled with a porous material (7).
8. A multi-cavity composite sound absorbing structure according to claim 7, wherein the space below the bottom plate (5) at the bottom of each sound absorbing unit cavity (3) is filled with the porous material (7).
9. A multi-cavity composite sound absorbing structure according to claim 8, wherein the cellular material (7) filled in the slits is connected to the cellular material (7) filled in the space below the bottom plate (5).
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Cited By (1)
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| CN115352374A (en) * | 2022-10-21 | 2022-11-18 | 质子汽车科技有限公司 | Vehicle cab and vehicle |
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