CN116913238A - Gradient coupling acoustic super structure based on porous sound absorption material and design method - Google Patents
Gradient coupling acoustic super structure based on porous sound absorption material and design method Download PDFInfo
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- CN116913238A CN116913238A CN202310820053.7A CN202310820053A CN116913238A CN 116913238 A CN116913238 A CN 116913238A CN 202310820053 A CN202310820053 A CN 202310820053A CN 116913238 A CN116913238 A CN 116913238A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 110
- 239000000463 material Substances 0.000 title claims abstract description 38
- 230000008878 coupling Effects 0.000 title claims abstract description 31
- 238000010168 coupling process Methods 0.000 title claims abstract description 31
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000013461 design Methods 0.000 title abstract description 13
- 239000011358 absorbing material Substances 0.000 claims abstract description 42
- 238000005192 partition Methods 0.000 claims description 12
- 238000004088 simulation Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
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- 230000001808 coupling effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the field of sound absorption materials and structural design, in particular to a gradient coupling acoustic super structure based on a porous sound absorption material and a design method, wherein the acoustic super structure comprises a sound absorption structure body and a top plate covered on the sound absorption structure body: the top plate is provided with a plurality of through holes, and the upper surface of the top plate is covered with a first porous sound absorption material layer; the sound absorption structure body comprises at least 2 circular resonant cavities and a bottom; all the square resonant cavities are distributed on the bottom in an equivalent length gradient mode, and the upper ends of all the square resonant cavities are positioned on the same horizontal plane; the through hole on the top plate is communicated with the square resonant cavity; the lower surface of the bottom is horizontal; the sound absorbing structure is internally filled with a plurality of second porous sound absorbing material layers. The invention realizes the full-band high-efficiency sound absorption covering low frequency and medium and high frequency by coupling the unit structures with different peak frequencies and combining the porous material for the medium and high frequency broadband sound absorption.
Description
Technical Field
The invention belongs to the field of sound absorption materials and structural design, and particularly relates to a gradient coupling acoustic super structure based on a porous sound absorption material and a design method.
Background
Noise present in everyday life and work environments severely affects the physical and mental health of humans and the reliable operation of equipment, wherein industrial noise is often accompanied by a large amount of broadband noise generation. The porous sound absorbing material (such as glass wool, rock wool, foam plastic, felt and the like) has good sound absorbing performance because of a large number of micro-pores and holes communicated with the inside and the outside, when sound waves are incident on the porous material, the sound waves can enter the inside of the material along the pores to cause vibration of air molecules in the pores, and the sound energy is converted into friction heat energy and consumed due to viscous resistance of the air and friction of the air molecules and pore walls, so that the porous sound absorbing material has a sound absorbing effect. However, the porous sound-absorbing material has remarkable middle-high frequency sound-absorbing performance and weaker low frequency dissipation, cannot meet the requirements of broadband sound absorption and noise reduction, and limits the practical application of the porous sound-absorbing material in the field of industrial noise control.
In recent years, an acoustic super structure with sub-wavelength characteristics is rapidly developed, and the acoustic super structure can control elastic waves with large wavelength and low frequency by a small-size structure, break through the law of mass density and realize a low-frequency sound wave control function. Thus, an acoustic superstructure with exceptional physical properties provides new possibilities for designing a more compact low frequency sound absorbing structure, enabling efficient low frequency sound absorption by manual design. However, due to the resonance characteristic of the acoustic superstructure, the sound absorption frequency band is narrow, and sound absorption can be performed only for specific frequencies, so that a broadband sound absorption effect cannot be achieved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a gradient coupling acoustic super structure based on a porous sound absorption material and a design method thereof, so as to solve the problem that the existing acoustic super structure can only absorb sound aiming at specific frequency and has narrower sound absorption frequency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a gradient coupled acoustic superstructure based on porous sound absorbing materials, comprising a sound absorbing structure and a top panel overlaying the sound absorbing structure, wherein:
the top plate is provided with a plurality of through holes, and the upper surface of the top plate is covered with a first porous sound absorption material layer;
the sound absorption structure body comprises at least 2 circular resonant cavities and a bottom; all the square resonant cavities are distributed on the bottom in an equivalent length gradient mode, and the upper ends of all the square resonant cavities are positioned on the same horizontal plane; the through hole on the top plate is communicated with the square resonant cavity; the lower surface of the bottom is horizontal; the sound absorbing structure is internally filled with a plurality of second porous sound absorbing material layers.
Further, the number of the square resonant cavities is 2-23.
Further, the heights of all the square resonant cavities in the sound absorption structure body are the same, or the heights of the square resonant cavities are distributed in an inverted V-shaped gradient mode, or are distributed randomly.
Further, the distance between adjacent loop-shaped resonant cavities is more than or equal to 0.5mm.
Further, a through hole is formed in the side wall of at least one of the square resonant cavities in the sound absorption structure body.
Further, at least two baffles are disposed in the sound absorbing structure.
Further, two partition boards perpendicular to the side walls of the square resonant cavity are arranged between the square resonant cavity where the through hole is located and the square resonant cavity at the periphery of the square resonant cavity, and the two partition boards are fixed on two sides of the side wall of the square resonant cavity where the through hole is located or on two different side walls.
Further, the heights of the upper ends of all the second porous sound absorption material layers in the sound absorption structure body are distributed in an inverted V-shaped gradient mode.
Further, 193 through holes are formed in the top plate; the sound absorption structure body is internally provided with 15 square resonant cavities, the side walls of the 8 th and 10 th square resonant cavities 4 from inside to outside in the sound absorption structure body are respectively provided with rectangular through holes, and two partition boards perpendicular to the side walls of the square resonant cavities are arranged between the square resonant cavity where each through hole is located and the square resonant cavity at the periphery of the square resonant cavity.
On the other hand, the invention provides a design method of the gradient coupling acoustic super structure based on the porous sound absorption material, which comprises the following steps:
step 1, preliminarily determining structural parameters of a gradient coupling acoustic super structure according to a low-frequency target sound absorption section, wherein the structural parameters comprise the thickness of a top plate, the aperture and the interval of a through hole, the equivalent length, the height and the number of a rectangular resonant cavity;
step 2, preliminarily determining the types and the thicknesses of the first porous sound absorption material layer and the second porous sound absorption material layer according to the middle-high frequency target sound absorption section;
step 3, establishing a finite element model according to structural parameters of the first porous sound absorption material layer, the second porous sound absorption material layer and the gradient coupling acoustic super structure to perform sound absorption simulation, so as to obtain a sound absorption curve;
and 4, correcting the thickness of the second porous sound absorption material and the thickness of the first porous sound absorption material layer in each loop-shaped resonant cavity and the structural parameters of the gradient coupling acoustic super structure according to the sound absorption curve, wherein the structural parameters comprise the thickness of the top plate, the aperture and the distance of the through holes, the equivalent length, the height and the number of the loop-shaped resonant cavities, and the final gradient coupling acoustic super structure based on the porous sound absorption material is obtained.
Compared with the prior art, the invention has the following beneficial effects:
the invention realizes the full-band high-efficiency sound absorption covering low frequency and medium and high frequency by coupling the unit structures with different peak frequencies and combining the porous material for the medium and high frequency broadband sound absorption. The sound absorption requirements of the middle and low frequency bands are mainly met by the gradient coupling acoustic super structure, and the sound absorption requirements of the middle and high frequency bands are jointly achieved by the gradient coupling acoustic super structure and the porous sound absorption material. The invention has the advantages that the sound absorption performance is related to structural parameters, the geometric dimensions of the gradient coupling acoustic super structure and the porous sound absorption material can be determined according to specific sound absorption requirements, the design is accurate and reliable, and the broadband high-efficiency sound absorption effect can be achieved. The design method of the invention makes up the defects of the existing acoustic super structure, and has important practical application value in a plurality of engineering fields.
Drawings
FIG. 1 is a schematic diagram of a gradient coupled acoustic superstructure provided by an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a gradient coupled acoustic superstructure based on porous sound absorbing materials provided by an embodiment of the present invention;
FIG. 3 is a schematic fluid domain diagram of a gradient coupled acoustic superstructure provided by an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a fluid domain of a gradient coupled acoustic superstructure based on porous sound absorbing materials, provided by an embodiment of the present invention;
FIG. 5 is a graph of sound absorption for an embodiment of the present invention;
in the figure, a top plate is 1; 2-through holes; 3-sound absorbing structure; 4-a resonant cavity; 5-a first layer of porous sound absorbing material; 6-wall holes; 7-a separator; 8-a second porous sound absorbing material layer; 9-bottom.
Detailed Description
The invention will now be described in further detail with reference to the drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making any inventive effort are within the scope of the present invention.
As shown in fig. 1 to 4, the gradient coupled acoustic super structure based on the porous sound absorbing material of the present invention comprises a sound absorbing structure 3 and a top plate 1 covered thereon, wherein:
the top plate 1 is provided with a plurality of through holes 2, the number of the through holes 2 is determined according to actual sound absorption requirements, along with the increase of the number, the resonance frequency moves towards high frequency, and the positions of the through holes 2 on the top plate can be determined according to the actual sound absorption requirements (such as a sound absorption frequency range and a sound absorption effect). The upper surface of the top plate 1 is covered with a first layer 5 of porous sound absorbing material.
The sound absorption structure body 3 comprises at least two square resonant cavities 4 and a bottom 9, the more square resonant cavities 4 are, the more sound absorption peaks are, but the sound absorption performance of the sound absorption structure body is reduced, and the number of square resonant cavities 4 is 2-23 in consideration of the requirements of subsequent processing and manufacturing, experimental testing and engineering application. All the gyroidal resonators 4 are distributed on the bottom 9 in a gradient of equivalent length (equivalent length refers to the length of the acoustic wave propagation path in the cross section of the gyroidal resonator 4), and the upper ends of all the gyroidal resonators 4 are located on the same horizontal plane. The through hole 2 on the top plate 1 is communicated with the square resonant cavity 4, and sound waves can enter the square resonant cavity 4 through the through hole 2 on the top plate 1. The lower surface of the bottom 9 is horizontal and the bottom 9 is equivalently a rigid hard wall. Meanwhile, the sound absorbing structure 3 is filled with a plurality of second porous sound absorbing material layers 8.
Preferably, the heights of all the loop-shaped resonant cavities 4 in the sound absorption structure body 3 are the same, or the heights of the loop-shaped resonant cavities are distributed in an inverted V-shaped gradient manner, or are distributed randomly (as shown in fig. 2 and 4). The height is determined according to the sound absorption frequency range on the premise that the optimal sound absorption performance is satisfied.
Preferably, the distance between adjacent square resonant cavities 4 is greater than or equal to 0.5mm, and when the number of square resonant cavities 4 is greater than 2, all square resonant cavities 4 are equally spaced or are variable in distance.
Preferably, through holes 6 are formed in the side wall of at least one of the square resonant cavities 4 in the sound absorption structure body 3, and the cross section of the through holes 6 can be circular, triangular or quadrangular.
At least two partition plates 7 are arranged in the sound absorption structure body 3, and the partition plates 7 are used for dividing the rectangular resonant cavity 4 where the partition plates are positioned into a plurality of independent sound absorption cavities. In particular, in the case that the through hole 6 is formed in the side wall of the rectangular resonant cavity 4, two partition plates 7 perpendicular to the side wall of the rectangular resonant cavity 4 are formed between the rectangular resonant cavity 4 where the through hole 6 is formed and the rectangular resonant cavity 4 around the rectangular resonant cavity 4, and the two partition plates 7 are fixed on both sides of the side wall of the rectangular resonant cavity 4 where the through hole 6 is formed or on different two side walls. This arrangement is advantageous in improving the peak frequency shift caused by the via hole.
Preferably, the heights of the upper ends of all the second porous sound absorbing material layers 8 in the sound absorbing structure body 3 are distributed in an inverted V-shaped gradient, as shown in fig. 2 and 4.
Preferably, the first porous sound absorbing material layer 5 and the second porous sound absorbing material layer 8 are made of polymer, metal foam, inorganic fiber or other synthetic fiber materials with physicochemical modification or structural design.
Example 1:
in this embodiment, the gradient coupling acoustic super structure based on porous sound absorbing material of the present invention comprises a sound absorbing structure body 3 and a top plate 1 covered thereon, wherein: 193 through holes 2 are formed in the top plate 1; the sound absorption structure body 3 is provided with 15 loop-shaped resonant cavities 4. Rectangular through holes 6 are respectively formed in the side walls of the 8 th and 10 th rectangular resonant cavities 4 from inside to outside in the sound absorption structure body 3. Two partition plates 7 perpendicular to the side walls of the square resonant cavities 4 are arranged between the square resonant cavity 4 where each through hole 6 is located and the square resonant cavity 4 at the periphery of the square resonant cavity. The first porous sound absorbing material layer 5 and the second porous sound absorbing material layer 8 are made of melamine foam materials modified by physical chemistry.
Through simulation, the sound absorption performance of the gradient coupling acoustic super structure is better than that of other conditions when the number of the loop-shaped resonant cavities 4 is 15, because the reduction of the number of the loop-shaped resonant cavities 4 is not beneficial to forming broadband sound absorption, the increase of the number can reduce the sound absorption performance, and high-efficiency sound absorption cannot be realized. In addition, through simulation, a group of through holes 2 are respectively arranged on the diagonal of the top plate 1, two groups of through holes 2 are respectively designed at the cross-shaped position of the top plate 1, a group of through holes 2 are respectively added above the cross shape of the six outermost square resonant cavities 4, and 193 through holes 2 are added in total, so that the sound absorption effect is good. Rectangular through holes 6 are respectively formed in the side walls of the 8 th and 10 th rectangular resonant cavities 4, and the sound absorption effect is better than that of the rectangular through holes in the rest places.
Example 2:
the design method of the gradient coupling acoustic super structure based on the porous sound absorption material provided by the embodiment comprises the following steps:
step 1, preliminarily determining structural parameters of a gradient coupling acoustic super structure according to a low-frequency target sound absorption section, wherein the structural parameters comprise the thickness of a top plate 1, the aperture and the interval of a through hole 2, the equivalent length, the height and the number of a rectangular resonant cavity 4; decreasing the spacing of the resonant cavities 4 increases the number and equivalent length of the resonant cavities 4, thereby moving the peak of sound absorption of the acoustic superstructure to low frequencies but decreasing the sound absorption coefficient.
Step 2, preliminarily determining the types and the thicknesses of the first porous sound absorbing material layer 5 and the second porous sound absorbing material layer 8 according to the middle-high frequency target sound absorbing section; the thickness of the porous sound absorbing material is increased, so that the sound absorbing effect of the middle and high frequency bands can be improved, and the sound absorbing frequency band can be widened; the thickness of the porous sound absorbing material refers to the length in the vertical direction.
Step 3, establishing a finite element model according to the structural parameters of the porous sound absorption materials 5 and 8 and the gradient coupling acoustic super structure to perform sound absorption simulation to obtain a sound absorption curve;
and 4, correcting the thickness of the second porous sound absorbing material 8 and the thickness of the first porous sound absorbing material layer 5 in each loop-shaped resonant cavity and the structural parameters of the gradient coupling acoustic super structure (including the thickness of the top plate 1, the aperture and the spacing of the through holes 2, the equivalent length, the height and the number of the loop-shaped resonant cavities 4) according to the sound absorption curve to obtain the final gradient coupling acoustic super structure based on the porous sound absorbing material.
The sound absorption coefficients of the gradient coupled acoustic super structure based on the first porous sound absorbing material layer 5 and the second porous sound absorbing material layer 8 are calculated in the thermo-viscous acoustic module and the pressure acoustic module of the finite element simulation software COMSOL Multiphysics. The sound absorption curve of the gradient coupling acoustic super structure based on the porous sound absorption material is shown in fig. 5, and the average sound absorption coefficient of the gradient coupling acoustic super structure is 0.8179 in the frequency band of 300-1600Hz, so that the gradient coupling acoustic super structure has good broadband sound absorption effect.
The invention relates to a working principle of a gradient coupling acoustic super structure based on a porous sound absorption material:
the sound waves enter the inside of the structure through the porous sound absorbing material layer 5 on the surface of the top plate 1 and the through holes 2 on the top plate 1 to reach the sound absorbing structure body 3. When the incidence frequency of sound waves is consistent with the vibration frequency of the acoustic super structure, the acoustic super structure resonates, the sound waves vibrate in the echo-shaped resonant cavity, and the sound energy is consumed by friction with the inner wall to generate a viscous heat effect, so that a sound absorption peak value appears. At the same time, sound waves propagate within the resonant cavity 4. When sound waves enter the internal gaps of the porous sound absorbing materials 5 and 8, air and material fibers vibrate, friction and heat conduction between the air and the hole walls are generated, and most of sound energy is converted into heat energy to be dissipated. In general, each of the loop-shaped resonators 4 corresponds to a resonance frequency which is related to the equivalent length of the loop-shaped resonator 4, and the lower the sound absorption frequency is, the longer the equivalent length of the loop-shaped resonator 4 is required. Due to the impedance coupling effect between the loop-shaped resonant cavities 4 and the middle-high frequency broadband sound absorption characteristics of the first porous sound absorption material layer 5 and the second porous sound absorption material layer 8, the acoustic super structure can realize full-frequency band high-efficiency sound absorption covering low frequency and middle-high frequency.
Claims (10)
1. A gradient-coupled acoustic superstructure based on porous sound absorbing material, characterized by comprising a sound absorbing structure 3 and a top plate (1) covering it, wherein:
a plurality of through holes (2) are formed in the top plate (1), and a first porous sound absorption material layer (5) is covered on the upper surface of the top plate (1);
the sound absorption structure body (3) comprises at least 2 square resonant cavities (4) and a bottom (9); all the square resonant cavities (4) are distributed on the bottom (9) in an equivalent length gradient mode, and the upper ends of all the square resonant cavities (4) are positioned on the same horizontal plane; the through hole (2) on the top plate (1) is communicated with the rectangular resonant cavity (4); -the lower surface of the bottom (9) is horizontal; the sound absorption structure body (3) is filled with a plurality of second porous sound absorption material layers (8).
2. Gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, characterized in that the number of the loop-shaped cavities (4) is 2-23.
3. Gradient-coupled acoustic superstructure based on porous sound-absorbing material according to claim 1, characterized in that all the cavities (4) of the sound-absorbing structure (3) have the same height, or their height is distributed in an inverted V-shaped gradient, or they are distributed randomly.
4. Gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, characterized in that the spacing between adjacent resonant cavities (4) of the shape of a circle is greater than or equal to 0.5mm.
5. The gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, characterized in that through holes (6) are provided in the side wall of at least one of the resonant cavities (4) of the sound absorbing structure (3).
6. Gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, characterized in that at least two baffles (7) are arranged in the sound absorbing structure (3).
7. The gradient coupling acoustic super structure based on the porous sound absorbing material according to claim 5, wherein two partition plates (7) perpendicular to the side walls of the rectangular resonant cavity (4) are arranged between the rectangular resonant cavity (4) where the through hole (6) is located and the rectangular resonant cavity (4) at the periphery of the rectangular resonant cavity, and the two partition plates (7) are fixed on two sides of the side wall of the rectangular resonant cavity (4) where the through hole (6) is located or are fixed on two different side walls.
8. The gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, wherein the heights of the upper ends of all the second porous sound absorbing material layers (8) within the sound absorbing structure (3) are distributed in an inverted V-shaped gradient.
9. The gradient-coupled acoustic superstructure based on porous sound absorbing material according to claim 1, wherein 193 through-holes (2) are opened in the top plate (1); the sound absorption structure body (3) is internally provided with 15 square resonant cavities (4), the side walls of the 8 th square resonant cavity (4) and the 10 th square resonant cavity (4) from inside to outside in the sound absorption structure body (3) are respectively provided with rectangular through holes (6), and two partition boards (7) perpendicular to the side walls of the square resonant cavities (4) are arranged between the square resonant cavity (4) where each through hole (6) is located and the square resonant cavity (4) at the periphery of the square resonant cavity.
10. A method of designing a gradient-coupled acoustic superstructure based on porous sound absorbing material as claimed in claims 1 to 9, comprising the steps of:
step 1, preliminarily determining structural parameters of a gradient coupling acoustic super structure according to a low-frequency target sound absorption section, wherein the structural parameters comprise the thickness of a top plate (1), the aperture and the interval of a through hole (2), and the equivalent length, the height and the number of a rectangular resonant cavity (4);
step 2, preliminarily determining the types and the thicknesses of the first porous sound absorption material layer (5) and the second porous sound absorption material layer (8) according to the middle-high frequency target sound absorption section;
step 3, establishing a finite element model according to structural parameters of the first porous sound absorption material layer (5), the second porous sound absorption material layer (8) and the gradient coupling acoustic super structure to perform sound absorption simulation to obtain a sound absorption curve;
and 4, correcting the thickness of the second porous sound absorption material layer (8) and the thickness of the first porous sound absorption material layer (5) in each loop-shaped resonant cavity (4) and the structural parameters of the gradient coupling acoustic super structure according to the sound absorption curve, wherein the structural parameters comprise the thickness of the top plate (1), the aperture and the spacing of the through holes (2), the equivalent length, the height and the number of the loop-shaped resonant cavities (4), and the final gradient coupling acoustic super structure based on the porous sound absorption material is obtained.
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| CN117364944A (en) * | 2023-12-04 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Sound-deadening structure for building |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117364944A (en) * | 2023-12-04 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Sound-deadening structure for building |
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