CN114108856B - Fractal sound-absorbing super-surface unit structure and fractal sound-absorbing super-surface - Google Patents
Fractal sound-absorbing super-surface unit structure and fractal sound-absorbing super-surface Download PDFInfo
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- CN114108856B CN114108856B CN202111416749.0A CN202111416749A CN114108856B CN 114108856 B CN114108856 B CN 114108856B CN 202111416749 A CN202111416749 A CN 202111416749A CN 114108856 B CN114108856 B CN 114108856B
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
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- 238000005192 partition Methods 0.000 claims description 13
- 125000006850 spacer group Chemical group 0.000 claims 3
- 238000004088 simulation Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000007405 data analysis Methods 0.000 description 4
- 229910052602 gypsum Inorganic materials 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/8209—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only sound absorbing devices
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a fractal sound-absorbing super-surface unit structure and a fractal sound-absorbing super-surface, comprising the following components: the shell cover and the shell body are provided with through holes; the shell body comprises an outer shell module, an inner shell module and a first baffle plate module, wherein the inner shell module is arranged in the outer shell module, a first cavity is formed between the outer shell module and the inner shell module, the first baffle plate module is connected with the outer shell module and the inner shell module, and the first cavity is divided into at least two fractal cavities; the inner shell module is provided with a second cavity and a sound transmission channel, and the sound transmission channel is communicated with the second cavity and the fractal cavity; the shell cover is connected with the shell body, and the through hole is communicated with the second cavity. By adopting the invention, the effective absorption of noise in the frequency range of 50 Hz-1500 Hz can be realized by changing the structural attribute of the fractal sound absorption super-surface unit.
Description
Technical Field
The invention relates to the technical field of acoustic super-surfaces, in particular to a fractal sound-absorbing super-surface unit structure and a fractal sound-absorbing super-surface.
Background
The sound absorbing material is very commonly applied in life, from bedrooms to living rooms, from meeting rooms to movie theatres, due to limited space, noise is reflected by wall surfaces for multiple times when being transmitted, so that standing wave and reverberation effects are formed, the noise level in the room is improved, and the noise emission exceeds standard. The common indoor noise reduction means is to install a sound absorbing board on the wall surface, and the noise reduction materials are mineral cotton, perforated gypsum and the like. The mineral wool acoustic board is prepared by taking mineral wool as a main raw material, adding a proper amount of additives, and performing working procedures such as batching, forming, drying, cutting and the like; the perforated gypsum board is formed by combining cylindrical holes penetrating through the front and back surfaces of the gypsum board, back coating materials with air permeability, sound absorbing materials capable of absorbing incident sound energy and the like are adhered to the back surface of the gypsum board, and the sound absorbing board has the advantages of incombustibility, corrosion resistance, good processability, low price and the like, but has low-frequency sound absorption coefficient and cannot effectively inhibit the reflection effect of noise.
The acoustic super-surface sound absorption structure is adopted to replace the traditional noise reduction material, so that the ultra-thin sound absorption super-surface is prepared, the medium-low frequency noise can be effectively absorbed, the heat conductivity is good, and the indoor heat dissipation is facilitated. The sound absorbing board is fixed on the wall surface through the keels, and the noise is absorbed through the resonance system, so that the indoor standing wave and reverberation effects can be eliminated, the sound insulating performance is realized, and the noise is prevented from being transmitted to the outside.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a fractal sound-absorbing super-surface unit structure and a fractal sound-absorbing super-surface, and effective absorption of noise in a frequency range of 50 Hz-1500 Hz can be realized by changing structural properties.
In order to solve the technical problems, the present invention provides a fractal sound-absorbing super-surface unit structure, which includes: a shell cover and a shell body,
the shell cover is provided with a through hole;
the shell comprises an outer shell module, an inner shell module and a first baffle plate module, wherein the inner shell module is arranged in the outer shell module, a first cavity is formed between the outer shell module and the inner shell module, the first baffle plate module is connected with the outer shell module and the inner shell module, and the first cavity is divided into at least two fractal cavities; the inner shell module is provided with a second cavity and a sound transmission channel, and the sound transmission channel is communicated with the second cavity and the fractal cavity;
the shell cover is connected with the shell body, and the through hole is communicated with the second cavity.
In a possible implementation, the cover further comprises a first insertion tube connected to the through hole and entering the second cavity.
In one possible implementation manner, the housing module includes a first side plate and a housing bottom, the first side plate is disposed between the housing cover and the housing bottom, and the first side plate is fixedly connected with the housing bottom.
In one possible implementation manner, the inner shell module comprises a second side plate and at least two inserts, the second side plate is connected with the first side plate through the first partition plate module, at least two notches are formed in the periphery of the second side plate, the notches are connected with the inserts in a one-to-one correspondence mode, and the inserts extend from the second side plate to the first side plate.
In one possible implementation, the insert is a second insert tube, or the insert comprises two oppositely disposed insert plates; the insert communicates the fractal cavity with the second cavity, the insert defining the sound transmission channel.
In one possible implementation, the first partition module includes at least two first partitions, each of which connects the first side plate and the second side plate to form at least one fractal cavity.
In one possible implementation, the shape of the through hole is circular, square, rectangular or triangular.
In one possible implementation, the shape of the cover, the bottom, the first side plate and the second side plate is square, pentagonal, hexagonal, octagonal, fan-shaped, circular or cardioid.
In one possible implementation, the length of each of the inserts is the same or different, and the length of each of the inserts is no greater than the distance between the first side plate and the second side plate; the first insertion tube has a height not greater than a depth of the second cavity.
In a second aspect of the present application, a fractal sound-absorbing super-surface using the fractal sound-absorbing super-surface unit structure in the first aspect is provided, and the fractal sound-absorbing super-surface comprises a plurality of fractal sound-absorbing super-surface unit structures, and the fractal sound-absorbing super-surface is formed by splicing the fractal sound-absorbing super-surface unit structures, wherein the sound-absorbing frequencies of the fractal sound-absorbing super-surface unit structures are the same or different.
The implementation of the invention has the following beneficial effects:
the fractal sound absorption super-surface unit structure comprises a shell cover and a shell body, wherein a through hole and a first insertion pipe are arranged on the shell cover, the through hole is connected with the first insertion pipe, incident sound waves enter from the through hole, enter the shell body through the propagation of the first insertion pipe, enter a second cavity in the middle of the shell body firstly through the propagation of the first insertion pipe, and propagate to the fractal cavity through a sound transmission channel, so that the incident sound waves are converted from sound energy to mechanical energy to internal energy, and effective absorption of noise is realized.
The fractal sound absorption super-surface unit structure provided by the application not only can achieve the effect of high sound absorption efficiency, but also has the characteristics of thinner structure thickness, less material consumption and easy manufacture. The size of the fractal sound absorption super-surface unit structure can be adjusted according to the frequency band range of sound absorption, and the absorption effect on specific frequency noise is improved.
Drawings
Fig. 1 is an internal structural view of a fractal sound absorbing super surface unit structure shown in accordance with an exemplary embodiment;
fig. 2 is a perspective view of a fractal sound absorbing super surface unit structure, shown in accordance with an exemplary embodiment;
FIG. 3 is an internal block diagram of a fractal sound absorbing super surface unit structure shown in accordance with an exemplary embodiment;
FIG. 4 is a structural parameter identification diagram of a fractal sound absorbing subsurface unit structure, according to an exemplary embodiment;
FIG. 5 is a schematic structural view of a fractal sound absorbing super surface unit structure shown in accordance with an exemplary embodiment;
FIG. 6 is a Comsol simulation result of one fractal sound absorbing super surface unit structure shown in FIG. 5;
fig. 7 is a schematic structural diagram of a fractal sound absorbing super surface unit structure, shown in accordance with an exemplary embodiment;
FIG. 8 is a Comsol simulation result of one fractal sound absorbing super surface unit structure shown in FIG. 7;
fig. 9 is a schematic structural view of a fractal sound absorbing super surface unit structure shown in accordance with an exemplary embodiment;
FIG. 10 is a Comsol simulation result of one fractal sound absorbing super surface unit structure shown in FIG. 9;
FIG. 11 is a schematic structural view of a fractal sound absorbing super surface unit structure shown in accordance with an exemplary embodiment;
FIG. 12 is a Comsol simulation result of one fractal sound absorbing super surface unit structure shown in FIG. 11;
FIG. 13 is a perspective view of a fractal sound absorbing super surface shown in accordance with an exemplary embodiment;
fig. 14 is a front view of a fractal sound absorbing super surface, according to an exemplary embodiment;
fig. 15 is a coomsol simulation result of a fractal sound absorbing super surface shown in fig. 13-14.
Reference numerals in the drawings: 100-shell cover, 110-through hole, 120-first insert tube, 200-shell body, 210-outer shell module, 211-first side plate, 212-shell bottom, 220-inner shell module, 221-second side plate, 222-insert, 230-first partition plate module, 231-first partition plate.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The embodiment of the invention provides a fractal sound-absorbing super-surface unit structure and a fractal sound-absorbing super-surface based on a Helmholtz resonance principle, and effective absorption of noise in a frequency range of 50 Hz-1500 Hz is realized by changing structural properties.
As shown in fig. 1, a fractal sound-absorbing super-surface unit structure comprises a shell cover 100 and a shell body 200, wherein the shell cover 100 comprises a through hole 110 and a first insertion tube 120, the through hole 110 is arranged on the shell cover 100, and the first insertion tube 120 is connected with the through hole 110; the shell body 200 comprises an outer shell module 210, an inner shell module 220 and a first partition plate module 230, wherein the inner shell module 220 is arranged in the outer shell module 210, a first cavity is formed between the outer shell module 210 and the inner shell module 220, the first partition plate module 230 is connected with the outer shell module 210 and the inner shell module 220, and the first cavity is divided into four fractal cavities; the inner case module 220 has a second cavity and a sound transmission channel, and the sound transmission channel communicates the second cavity with the fractal cavity; the cover 100 is coupled to the body 200, and the first insertion tube 120 enters the second cavity. The housing module 210 includes a first side plate 211 and a housing bottom 212, the first side plate 211 is disposed between the housing cover 100 and the housing bottom 212, and the first side plate 211 is fixedly connected with the housing bottom 212. The inner shell module 220 includes a second side plate 221 and four inserts 222, the second side plate 221 is connected to the first side plate 221 through a first partition module 230, the second side plate 221 is provided with notches along the circumference, the notches are connected to the inserts 222 in one-to-one correspondence, and the inserts 222 extend from the second side plate 221 to the first side plate 211. The insert 222 is a second insert tube or includes two oppositely disposed insert plates. The insert 222 communicates the fractal cavity with the second cavity, the insert 222 defining a sound transmission channel; the first partition module 230 includes four first partitions 231, each first partition 231 is respectively connected with the first side plate 211 and the second side plate 221 to form four fractal cavities, four inserts 222 respectively enter the four fractal cavities, the lengths of the inserts 222 are the same or different, and the length of each insert 222 is not greater than the distance between the first side plate 211 and the second side plate 221.
As shown in fig. 2, the cover 100 is covered on the housing body 200, and is in an external form when in use in fig. 1, and in the manufacturing process, the cover 100, the through hole 110 and the first insertion tube 120 are integrally formed, and the outer housing module 210, the inner housing module 220 and the first partition module 230 are integrally formed; the through holes are circular, square, rectangular or triangular, and the cover 100, the bottom 212, the first side plate 211 and the second side plate 221 are square (as shown in fig. 1), pentagonal, hexagonal, octagonal, fan-shaped, circular (as shown in fig. 3) or heart-shaped.
Referring to fig. 1 or 3, the first insertion tube, the second cavity, the insertion piece and the fractal cavity together form a two-degree-of-freedom vibration system, when sound waves enter the fractal sound absorption super-surface unit structure through the through holes, when the frequency of the incident sound waves is consistent with the natural frequency of the two-degree-of-freedom vibration system, the air in the cavity can generate intense vibration, so that the conversion from sound energy to mechanical energy to internal energy is realized, and when a plurality of two-degree-of-freedom vibration systems exist, the two-degree-of-freedom vibration systems are mutually coupled, so that the sound absorption frequency band is widened. In addition, the frequency range absorbed by the fractal sound-absorbing super-surface unit structure is related to the overall size of the unit structure, the first insertion tube, the insertion piece and the size of the second cavity, the fractal sound-absorbing super-surface unit structure is illustrated by taking the shape of the fractal sound-absorbing super-surface unit structure in fig. 1 as an example, the through holes of the fractal sound-absorbing super-surface unit structure are arranged in a round shape, the shell cover, the shell bottom and the first side plate are arranged in a square shape, and please refer to fig. 4, and the measurement of the sound absorption coefficient of the fractal sound-absorbing super-surface unit structure in the corresponding frequency range is simulated by changing the parameters of the overall size (length (D), width (W), height (H)), the radius (r 1) and height (H1) of the first insertion tube, the size (length (Rh), width (W1), height (H2)) of the insertion piece and the radius (r 2) of the second cavity.
Fig. 5 shows the structural form of the fractal sound absorption super surface when D and W are 200mm, h is 30mm, r1 and h1 are 0, i.e., there is no first insertion tube, rh is 80mm, W1 is 1.5mm, h2 is 30mm, r2 is 2mm, and fig. 6 shows the data analysis of COMSOL simulation by the structure shown in fig. 5, it can be seen that the fractal sound absorption super surface unit has a sound absorption coefficient of 0.45 at a frequency of 50Hz, and a sound absorption effect is good.
Fig. 7 shows the structural form of the fractal sound absorption super surface when D and W are 50mm, h is 20mm, r1 is 4.3mm, h1 is 2.2mm, rh is 15mm, W1 is 1.5mm, h2 is 20mm, r2 is 10mm, and fig. 8 shows the data analysis of COMSOL simulation by the structure shown in fig. 7, and it can be seen that the fractal sound absorption super surface unit has a sound absorption coefficient of 0.6 at a frequency of 500Hz and a good sound absorption effect.
Fig. 9 shows the structural form of the fractal sound absorption super surface with D and W of 40mm, h of 10mm, r1 of 4.2mm, h1 of 2mm, rh of 2mm, W1 of 1.5mm, h2 of 10mm, r2 of 6mm, and fig. 10 shows the data analysis of COMSOL simulation by the structure shown in fig. 9, and it can be seen that the fractal sound absorption super surface unit has a sound absorption coefficient of 0.28 and a good sound absorption effect at a frequency of 1000 Hz.
Fig. 11 shows the structural form of a fractal sound-absorbing super surface with D and W of 25mm, h of 15mm, r1 of 4mm, h1 of 1mm, rh of 2mm, W1 of 1.5mm, h2 of 15mm, r2 of 6mm, and fig. 12 shows data analysis of COMSOL simulation with the structure shown in fig. 11, and it can be seen that the fractal sound-absorbing super surface unit has a sound absorption coefficient of 0.09 at a frequency of 1500 Hz.
As can be seen from fig. 7 to 12, as the overall size of the fractal sound-absorbing super-surface unit structure becomes larger, the size of the insert becomes larger, the radius and height of the first insert become larger gradually, and the radius of the second cavity becomes larger gradually, the sound-absorbing frequency of the fractal sound-absorbing super-surface unit structure shifts gradually to a lower frequency, and further, it can be seen that the sound-absorbing frequency of the fractal sound-absorbing super-surface unit structure can be adjusted comprehensively according to the above characteristics, and the fractal sound-absorbing super-surface unit structures with different structural size characteristics can be combined to form a sound-absorbing super-surface of a wide frequency band.
The invention also provides a fractal sound-absorbing super-surface using the fractal sound-absorbing super-surface unit structure, which comprises a plurality of fractal sound-absorbing super-surface unit structures, wherein the fractal sound-absorbing super-surface is formed by splicing the fractal sound-absorbing super-surface unit structures, and the sound-absorbing frequencies of the fractal sound-absorbing super-surface unit structures are the same or different. The shells of the fractal sound absorption super surfaces can be spliced with each other or connected with each other through connecting pieces.
As shown in fig. 13-14, the fractal sound-absorbing super surface consists of 25 fractal sound-absorbing super surface unit structures, the sizes and shapes of through holes of the unit structures are not all the same, the heights of the first insertion pipes are not all the same, the lengths of the insertion pieces are not all the same, the positions of the first baffle plate modules are not all the same, the sound-absorbing frequencies of the unit structures are different, in the specific implementation process, through holes are formed in a shell cover of each fractal sound-absorbing super surface and are the same as the axes of the first insertion pipes, the through holes are integrally formed with the shell cover, the first baffle plate module, the inner shell module and the outer shell module of the shell are integrally formed, the shell cover and the shell body are respectively formed and then are connected through ultrasonic welding or an epoxy resin adhesive layer, so that the preparation process steps and the preparation cost are reduced, after the fractal sound-absorbing super surface unit structures are respectively manufactured, the fractal sound-absorbing super surface modules are fixedly connected through connecting pieces, a shell is arranged outside the fractal sound-absorbing super surface panel, one side of the shell is connected with the shell cover of each fractal sound-absorbing super surface unit, the other side is connected with the shell cover of each fractal sound-absorbing super surface unit, the fractal sound-absorbing super surface unit has the total thickness of 12mm, the fractal sound-absorbing super surface formed by the fractal sound-absorbing super surface unit has the thickness of the fractal sound-absorbing super surface unit, and the fractal sound-absorbing super surface unit has the average sound absorption layer thickness of the fractal sound-absorbing super surface unit, and the fractal sound-absorbing super surface structure is in the average sound absorption structure, and the sound absorption structure. The thickness is thinner, so that occupied space is smaller, the sound absorption frequencies of the fractal sound absorption super-surface units are inconsistent, multilevel resonance is formed between the fractal sound absorption super-surface units, and a coupling effect is generated, so that the sound absorption frequency band is widened.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A fractal sound absorbing supersurface unit structure, comprising: a shell cover and a shell body,
the shell cover is provided with a through hole;
the shell comprises an outer shell module, an inner shell module and a first baffle plate module, wherein the inner shell module is arranged in the outer shell module, a first cavity is formed between the outer shell module and the inner shell module, the first baffle plate module is connected with the outer shell module and the inner shell module, and the first cavity is divided into at least two fractal cavities; the inner shell module is provided with a second cavity and a sound transmission channel, and the sound transmission channel is communicated with the second cavity and the fractal cavity;
the shell cover is connected with the shell body, and the through hole is communicated with the second cavity;
the shell module comprises a first side plate and a shell bottom, wherein the first side plate is arranged between the shell cover and the shell bottom and is fixedly connected with the shell bottom;
the inner shell module comprises a second side plate and at least two inserts, the second side plate is connected with the first side plate through the first partition plate module, at least two notches are formed in the second side plate along the circumference, the notches are connected with the inserts in one-to-one correspondence mode, and the inserts extend from the second side plate to the first side plate.
2. The fractal sound absorbing super surface unit structure recited in claim 1, wherein said housing cover further comprises a first insertion tube, said first insertion tube being connected to said through hole and into said second cavity.
3. A fractal sound absorbing super surface unit structure as recited in claim 1, wherein said insert is a second insert tube or said insert comprises two oppositely disposed insert plates; the insert communicates the fractal cavity with the second cavity, the insert defining the sound transmission channel.
4. The fractal sound absorbing super surface unit structure as recited in claim 1, wherein said first spacer module comprises at least two first spacers, each of said first spacers connecting said first side plate with said second side plate to form at least one of said fractal cavities.
5. A fractal sound absorbing super surface unit structure as recited in claim 1, wherein the through holes are circular, rectangular or triangular in shape.
6. The fractal sound absorbing super surface unit structure as recited in claim 1, wherein the shape of the cover, the bottom, the first side plate and the second side plate is square, pentagonal, hexagonal, octagonal, fan-shaped, circular or cardioid.
7. The fractal sound absorbing super surface unit structure as recited in claim 2, wherein the length of each of said inserts is the same or different and each of said inserts has a length no greater than the distance between said first side plate and said second side plate; the first insertion tube has a height not greater than a depth of the second cavity.
8. A fractal sound-absorbing supersurface using the fractal sound-absorbing supersurface unit structure of any one of claims 1-7, comprising a plurality of fractal sound-absorbing supersurface unit structures, a plurality of said fractal sound-absorbing supersurface unit structures being spliced to form a fractal sound-absorbing supersurface, wherein the sound absorption frequencies of each fractal sound-absorbing supersurface unit structure are the same or different.
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| CN102606269B (en) * | 2012-04-16 | 2013-11-06 | 陈尔斌 | Impedance composite muffler |
| CN104196593B (en) * | 2014-08-28 | 2017-05-17 | 长城汽车股份有限公司 | Silencer and vehicle with silencer |
| RU2649209C2 (en) * | 2017-04-07 | 2018-03-30 | АО Казанский научно-исследовательский институт авиационных технологий (АО КНИАТ) | Sound absorbing panel and industrial room |
| CN110047458B (en) * | 2019-03-26 | 2021-02-26 | 西安交通大学 | Sound absorption unit, sound absorption structure and sound absorption method |
| CN214741561U (en) * | 2021-03-23 | 2021-11-16 | 西北工业大学 | Sound attenuation structure, muffler and unmanned aerial vehicle based on super material of acoustics |
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