CN114203137A - Multifunctional metamaterial with low-frequency sound absorption and bearing functions and additive manufacturing method thereof - Google Patents
Multifunctional metamaterial with low-frequency sound absorption and bearing functions and additive manufacturing method thereof Download PDFInfo
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- CN114203137A CN114203137A CN202111300603.XA CN202111300603A CN114203137A CN 114203137 A CN114203137 A CN 114203137A CN 202111300603 A CN202111300603 A CN 202111300603A CN 114203137 A CN114203137 A CN 114203137A
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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
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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
Abstract
The invention belongs to the technical field of acoustic metamaterial correlation, and discloses a multifunctional metamaterial with low-frequency sound absorption and bearing functions and a material increase manufacturing method thereof, wherein the metamaterial comprises a plurality of unit cells which are arranged in an array; the single cell is provided with a through hole and a plurality of single cavities, the through hole penetrates through the single cell, the single cavities are arranged around the through hole, and the through hole is communicated with the single cavities one by one through a plurality of micropores respectively so as to form a plurality of Helmholtz resonant cavities; wherein, a plurality of single cavities are not directly communicated with each other. The through holes are introduced, the interval between the single cavities provides effective support for the single cells, the stability of the whole structure is improved, and meanwhile, a plurality of resonant cavities are formed, so that low-frequency sound absorption can be realized under the condition that the wavelength is far less than the noise wavelength.
Description
Technical Field
The invention belongs to the technical field of acoustic metamaterial correlation, and particularly relates to a multifunctional metamaterial with low-frequency sound absorption and bearing functions and an additive manufacturing method thereof.
Background
Traditional sound absorption materials such as perforated plates, sound absorption sponges and the like can obtain good sound absorption effect in the medium-high frequency sound wave range, and are widely applied to sound absorption of anechoic chambers and building materials. However, when the noise frequency is too low, the noise reduction capability of such porous materials is greatly reduced, and the purpose of noise reduction cannot be effectively achieved. The appearance of the metamaterial provides a new solution for solving the problem of low-frequency noise reduction. The research of the metamaterial originates from a left-handed material proposed by a physicist Veselago, and refers to a substance with both negative permeability and negative dielectric constant, which is completely opposite to the electromagnetic characteristic parameters of a natural material, and the electromagnetic performance is also completely opposite to that of the expressed material. Later, the metamaterial gradually develops into a structure or a composite material which is artificially designed and has physical characteristics which are not possessed by natural materials, the related fields include the fields of electromagnetism, acoustics, thermodynamics, mechanics and the like, and the metamaterial has wide application prospects in the fields of aerospace, biomedical treatment, engineering application and the like.
In recent years, significant results have been obtained in the research of acoustic metamaterials, and acoustic metamaterials typified by acoustic stealth cloak metamaterials, acoustic focusing metamaterials, and acoustic absorption metamaterials have been developed. In the aspect of sound absorption metamaterials, the problem of noise reduction of low-frequency noise becomes a main research focus, and the acoustic impedance of the structural unit can be completely matched with that of air through careful structural design. According to the sound absorption theory, when the acoustic impedance of the sound absorber is completely matched with that of air, incident sound waves cannot be reflected, and due to the blocking effect of the sound absorber, the sound waves cannot be transmitted, sound energy can be completely dissipated inside the sound absorber, and the perfect sound absorption effect is achieved. Although the operating frequency range of the resonance-based sound absorption metamaterial is narrow, the sound absorption bandwidth is significantly enhanced by combining unit cells having different sound absorption characteristics. However, the current research on the design of sound absorbing structures focuses only on their sound absorbing characteristics, and does not focus on their mechanical properties, which results in that they cannot withstand impact from the outside in practical use, although they have good sound absorbing properties.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a multifunctional metamaterial with low-frequency sound absorption and bearing functions and a material increase manufacturing method thereof, wherein the metamaterial has both low-frequency sound absorption performance and bearing performance, through holes and connecting walls (partition walls between single cavities) are introduced to provide effective support for single cells, and the connecting walls divide cavities in the single cells into a plurality of cavity structures communicated with the through holes, so that the stability of the whole structure is improved, a plurality of resonant cavities are formed at the same time, and low-frequency sound absorption can be realized under the condition that the wavelength is far less than the noise wavelength.
In order to achieve the above object, according to one aspect of the present invention, there is provided a multifunctional metamaterial with both low frequency sound absorption and bearing, where the metamaterial includes a plurality of unit cells arranged in an array;
the single cell is provided with a through hole and a plurality of single cavities, the through hole penetrates through the single cell, the single cavities are arranged around the through hole, and the through hole is communicated with the single cavities one by one through a plurality of micropores respectively so as to form a plurality of Helmholtz resonant cavities; wherein, a plurality of single cavities are not directly communicated with each other.
Furthermore, the unit cell comprises an outer cylinder shell, a through hole body, an upper cover plate, a lower cover plate and a plurality of connecting walls, wherein the outer cylinder shell is a cylinder body with openings at two ends, and the through hole body is provided with the through hole; the through hole body is arranged in the outer cylinder shell, and the two opposite ends of the connecting walls are respectively connected with the through hole body and the inner wall of the outer cylinder shell to form a plurality of single cavities; the through hole body is also provided with a plurality of micropores which are communicated with the through holes and the corresponding single cavities to form a plurality of Helmholtz resonant cavities; the upper cover plate and the lower cover plate are respectively arranged at two opposite ends of the outer cylinder shell and respectively cover two openings of the outer cylinder shell; the upper cover plate and the lower cover plate are respectively provided with a through groove, and the two through grooves are respectively connected with two ends of the through hole, so that the through hole is communicated with the outside.
Further, the shape of the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is the same as that of the cross section of the through hole body perpendicular to the height direction of the outer cylinder shell.
Further, the volumes of the plurality of single cavities are the same or not identical.
Furthermore, the cross section of the through hole, which is perpendicular to the height direction of the through hole, is square, and the corresponding side length a is A/20-A/5; the shape of the micropore is circular, and the diameter of the micropore is a/10-a.
Furthermore, the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is square, the side length of the corresponding square is A, the value range of A is 1/20-1/2 of the working wavelength of the unit cell, the height of the unit cell is D, and the value range of D is 1/20-1/4 of the working wavelength of the unit cell.
Furthermore, four corners of the through hole body are connected to corresponding corners of the outer cylinder shell through the connecting walls respectively to form four single cavities, and the cross section of each single cavity perpendicular to the height direction of the single cavity is triangular.
Further, the thickness b of the connecting wall2Is 0.1a to 0.8 a.
Further, the structures of a plurality of the unit cells are not completely identical.
According to another aspect of the invention, a method for manufacturing the multifunctional metamaterial with low-frequency sound absorption and bearing functions is provided.
Generally, compared with the prior art, the multifunctional metamaterial with low-frequency sound absorption and bearing and the additive manufacturing method thereof provided by the invention have the following beneficial effects:
1. the through hole is introduced, the partition wall between the single cavities provides effective support for the single cells, the stability of the whole structure is improved, a plurality of resonant cavities are formed simultaneously, when sound waves are incident, local resonance can be generated, the sound absorption effect is achieved, low-frequency sound absorption can be achieved under the condition that the wavelength of the sound waves is far less than that of the noise, the bearing performance is greatly improved compared with that of a traditional sound absorption metamaterial, and more excellent bearing capacity is displayed compared with a lattice structure.
2. On the premise of keeping the whole size of the unit cell unchanged, different sound absorption performance and bearing performance can be obtained by adjusting the position and other size parameters of the through hole, the acoustic impedance of the metamaterial is mainly determined by the aperture of the micropore and the volume of the cavity, when the position of the through hole is changed, the volume of each cavity is changed, the acoustic impedance of the metamaterial is further influenced, and the adjustment is convenient.
3. The single cells are not identical in structure, so that the sound absorption performance and the bearing performance of the single cells are not identical, and further, the single cells with different sound absorption performance are arranged in an array mode, so that the single cells with different sound absorption performance can be supplemented with each other, and the purpose of broadband noise reduction is achieved.
4. The multifunctional metamaterial has great design freedom, the size parameters of the multifunctional metamaterial can be adjusted according to actual sound absorption performance and bearing performance, and the optimal sound absorption performance and the optimal bearing performance can be obtained by combining a scientific optimization design method.
5. The single cavities in the multifunctional metamaterial are communicated with the outside, and the multifunctional metamaterial is complex in structure and very suitable for additive manufacturing and forming; by using the additive manufacturing technology, the structural sample piece can be well formed, and powder or liquid remained in the cavity can be discharged through the through hole.
6. The shape of the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is the same as that of the cross section of the through hole body perpendicular to the height direction of the outer cylinder shell, and therefore a single cavity and an array are formed conveniently.
Drawings
FIG. 1 is a schematic structural diagram of a single cell of a multifunctional metamaterial with low-frequency sound absorption and bearing provided by the invention;
FIG. 2 is an exploded schematic view of the unit cell of FIG. 1;
FIG. 3 is a schematic diagram of the unit cell of FIG. 1 with the upper cover removed;
FIG. 4 is a schematic plan view of the unit cell of FIG. 3;
FIG. 5 is a sound absorption performance curve diagram of the multifunctional metamaterial provided by the invention and having both low-frequency sound absorption and bearing;
FIG. 6 is a schematic diagram of comparison of mechanical properties of the multifunctional metamaterial provided by the present invention with elastic phases of a Body Centered Cubic (BCC) lattice structure.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-unit cell, 2-through hole, 3-connecting wall, 4-micropore.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a space low-frequency sound absorption and bearing multifunctional metamaterial which comprises a plurality of unit cells, wherein the unit cells are arranged in an array. The single cell is provided with a through hole and a plurality of single cavities, the through hole penetrates through the single cell, the single cavities are arranged around the through hole, and the through hole is communicated with the single cavities one by one through a plurality of micropores respectively so as to form a plurality of Helmholtz resonant cavities. Wherein, a plurality of single cavities are not directly communicated with each other. In the present embodiment, the plurality of unit cells are not completely identical in structure.
Referring to fig. 1, 2, 3 and 4, in one embodiment, the unit cell 1 includes an outer cylindrical shell, a through hole body, an upper cover plate, a lower cover plate and a plurality of connecting walls, the outer cylindrical shell is a cylindrical body with openings at two ends, the through hole body is provided with a through hole 2, and a central axis of the through hole 2 coincides with a central axis of the through hole body. The through hole body is arranged in the outer cylinder shell, and the two ends of the connecting walls, which are back to back, are respectively connected with the through hole body and the inner wall of the outer cylinder shell to form a plurality of single cavities. The through hole body is further provided with a plurality of micropores 4, and the micropores 4 are communicated with the through hole 2 and the corresponding single cavity to form a plurality of Helmholtz resonant cavities. The upper cover plate and the lower cover plate are respectively arranged at two ends of the outer cylinder shell, which are opposite to each other, and respectively cover two openings of the outer cylinder shell. The upper cover plate and the lower cover plate are respectively provided with a through groove, and the two through grooves are respectively connected with two ends of the through hole, so that the through hole is communicated with the outside.
In this embodiment, the thickness of the upper cover plate, the thickness of the lower cover plate, and the thickness of the outer cylinder shell are the same, and are all b; the height of the through hole 2, the height of the outer cylinder shell and the height of the through hole body are consistent; the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is square, the side length of the corresponding square is A, the value range of A is 1/20-1/2 of the single cell working wavelength, the height of the single cell is D, and the value range of D is 1/20-1/4 of the single cell working wavelength; the cross section of the through hole 2 perpendicular to the height direction of the through hole is square, the side length is a, the value range of a is A/20-A/5, the size of the through hole has certain influence on the sound absorption performance of the metamaterial, and the length of the through hole 2 is the difference between the thickness of a single cell and the thicknesses of an upper cover plate and a lower cover plate, namely D-2 & ltb & gt.
The cross section of the through hole body, which is vertical to the height of the through hole body, is also square, and four sides of the square are respectively parallel to four sides of the square cross section of the outer cylinder shell; the four side walls of the through hole 2 are respectively provided with a micropore 4, the micropore 4 is circular, the diameter thereof is d, and the value range is a/10-a; the circle center of the micropore 4 coincides with the geometric center of the side wall, and the pore diameters of the micropores on the side walls can be different; four corners of the through hole body are connected to corresponding corners of the outer cylinder shell through the connecting walls 3 respectively to form four single cavities, and the cross section of each single cavity perpendicular to the height direction of the single cavity is triangular. Of course, in other embodiments, the shape of the cross section of the through hole body perpendicular to the self height direction, and the shape of the cross section of the outer cylinder shell perpendicular to the self height direction may be other polygons, such as a rectangle, a diamond, and the like.
In one embodiment, a central axis of the through hole coincides with a central axis of the outer cylindrical shell, and of course, the position of the through hole relative to the outer cylindrical shell may be adjusted, and when the through hole is located in the middle of the outer cylindrical shell, the volumes of the four single chambers formed by the through hole are completely the same, and when the volumes of the corresponding four helmholtz resonator cavities are equal, the resonance absorption peaks also coincide; when the position of the through hole deviates from the middle of the unit cell, the volumes of the four single cavities are changed, and the resonance absorption frequency corresponding to each single cavity is changed, so that a plurality of resonance absorption peaks are obtained, and the effect of improving the sound absorption bandwidth is achieved.
Furthermore, the sound absorption effect of the metamaterial is realized through local resonance, and the resonance frequency is also determined for the determined structural parameters, so that the sound absorption bandwidth of a single metamaterial unit cell is very limited, the sound absorption effect can be good only in a narrow frequency range, and the application of a broadband noise reduction scene is not facilitated. By arranging a plurality of unit cells with different sound absorption performances in an array manner, the unit cells with different sound absorption performances can be mutually supplemented, and the purpose of broadband noise reduction is achieved.
Referring to FIG. 3, the thickness b of the connecting wall 32Is 0.1a to 0.8a, can adjust according to the bearing performance demand, and when the wall thickness increases, the bearing performance of structure will show and promote. The material selected for the multifunctional metamaterial can be properly selected according to actual requirements, and when the bearing performance is not high, a high polymer material can be selected; for scenes with high bearing performance requirements, metal materials can be selected.
Referring to fig. 4, aiming at the problems of poor bearing performance and the like of the traditional low-frequency noise sound absorption metamaterial, the through holes and the connecting walls are introduced into the rectangular cavity, so that the bearing strength of the structure is improved, the connecting walls divide the single-cell inner cavity into 4 triangular prism-shaped cavities, the four cavities are respectively marked with roman numerals as i, ii, iii and iv, and the stability of the whole structure is further improved due to the fact that the triangle has geometric stability. Circular through holes are respectively added on four walls of the through holes and are respectively communicated with the four single cavities, so that four Helmholtz resonators are formed, and when sound waves are incident, local resonance can be generated to achieve the sound absorption effect. On the premise of keeping the integral size of the unit cell unchanged, different sound absorption performance and bearing performance can be obtained by adjusting the position and other size parameters of the through hole. According to the sound absorption theory, when the acoustic impedance of the sound absorber is matched with that of air, a perfect sound absorption effect can be achieved. The acoustic impedance of the metamaterial is mainly determined by the aperture of the micropore and the volume of the cavity, and when the position of the through hole is changed, the volume of each cavity is changed, so that the acoustic impedance of the metamaterial is influenced; the rest size parameters, such as the section side length a of the through hole, the unit cell section side length A, the diameter D of the round micropore of the through hole wall, the thickness D of the unit cell and the like, can influence the sound absorption performance, and can be optimized and adjusted according to the actual application requirements.
The unit cell structure comprises four Helmholtz resonant cavities, and when sound waves are incident on the surface of the metamaterial, the thermal viscosity loss is enhanced due to the local resonance effect, so that low-frequency sound absorption can be realized under the condition of being far smaller than the noise wavelength. Simultaneously, compare in traditional sound absorption metamaterial, perforation and built-in connecting wall not only can increase hot adhesion loss, and because it distributes in succession in bearing direction, have divided into the cavity several triangular prism, have increased the stability of structure, can show the bearing mechanical properties who promotes sound absorbing structure. In addition, the structure has the characteristics of adjustable sound absorption and mechanical properties under the condition of keeping the overall dimension of the metamaterial unit unchanged. The sound absorption performance is adjusted mainly through the position change realization of through hole, and when the position change of through hole, the volume of four helmholtz resonance chambers can change, therefore can reach the effect of adjusting its sound absorption frequency. The adjustment of the mechanical property is mainly realized by changing the thickness of the connecting wall, the main force bearing part of the metamaterial is a through hole body and a built-in connecting wall, and when the thickness of the connecting wall is increased, the force bearing property of the metamaterial is obviously improved.
The invention also provides an additive manufacturing method of the multifunctional metamaterial with low-frequency sound absorption and bearing functions, the additive manufacturing method can be a Selective Laser Melting (SLM), a Selective Laser Sintering (SLS), a Fused Deposition Modeling (FDM) or a Stereolithography (SLA), and the adopted materials can be selected according to the process and the actual application requirements.
The present invention will be described in further detail with reference to specific examples.
Example 1
When the structure of the multifunctional metamaterial is designed, a target sound absorption frequency range needs to be determined firstly, then a proper material is selected according to the bearing requirement, and the size parameters are continuously modified to enable the material to reach the set target, wherein the specific design and manufacturing steps are as follows:
(1) setting a sound absorption target: the target sound absorption frequency is set to 360Hz, which is a low-frequency noise that is difficult to absorb and block.
(2) Setting a bearing target: according to the strength requirement of the sound absorption lining on the surface of the building, the bearing strength is set to be 50 MPa.
(3) Optimizing sound absorption performance: the COMSOL is utilized to construct a designed structural model, the side length of a single cell section is preset to be 50mm, other parameters are arbitrary values in a constraint condition, and the sound absorption effect is simulated and calculated. If the set sound absorption effect is not achieved, the size parameters are quantitatively modified and recalculated. And performing iterative optimization calculation until a target sound absorption effect is obtained.
(4) Optimizing the calculation result: through optimization calculation, when the following size parameters are obtained, the single cell achieves the optimal sound absorption effect at 360 Hz: the side length A of the unit cell section is 50mm, the thickness D of the unit cell is 20mm, the side length a of the through hole section is 5mm, the aperture D of each micropore on the side wall of each through hole is 2mm, all the wall thicknesses b are 1mm, and each through hole is positioned at the geometric center of the unit cell. The air volume ratio in the unit cell under the parameter is 77.9%.
(5) Model derivation: and exporting the optimized model into an STL format.
(6) Forming the metamaterial: and slicing in slicing software based on the exported model file, and forming the designed structure by adopting PLA material and utilizing FDM technology.
In order to verify the performance of the manufactured metamaterial, sound absorption performance test and mechanical property characterization are also carried out. Wherein, the sound absorption performance test: and testing the sound absorption performance of the printed multifunctional metamaterial unit cell in the acoustic impedance tube, wherein the test result is shown in fig. 5, the peak sound absorption coefficient is near 360Hz, and the sound absorption coefficient reaches 0.96.
And (3) mechanical property characterization: the mechanical properties of the designed multifunctional metamaterial and the BCC lattice structure are simulated and compared, and the modulus of the multifunctional metamaterial designed in the elastic section is far higher than that of the BCC lattice structure, as shown in FIG. 6.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a have multi-functional metamaterial of low frequency sound absorption and bearing concurrently which characterized in that:
the metamaterial comprises a plurality of unit cells which are arranged in an array;
the single cell is provided with a through hole and a plurality of single cavities, the through hole penetrates through the single cell, the single cavities are arranged around the through hole, and the through hole is communicated with the single cavities one by one through a plurality of micropores respectively so as to form a plurality of Helmholtz resonant cavities; wherein, a plurality of single cavities are not directly communicated with each other.
2. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 1, wherein: the unit cell comprises an outer cylinder shell, a through hole body, an upper cover plate, a lower cover plate and a plurality of connecting walls, wherein the outer cylinder shell is a cylinder body with openings at two ends, and the through hole body is provided with the through hole; the through hole body is arranged in the outer cylinder shell, and the two opposite ends of the connecting walls are respectively connected with the through hole body and the inner wall of the outer cylinder shell to form a plurality of single cavities; the through hole body is also provided with a plurality of micropores which are communicated with the through holes and the corresponding single cavities to form a plurality of Helmholtz resonant cavities; the upper cover plate and the lower cover plate are respectively arranged at two opposite ends of the outer cylinder shell and respectively cover two openings of the outer cylinder shell; the upper cover plate and the lower cover plate are respectively provided with a through groove, and the two through grooves are respectively connected with two ends of the through hole, so that the through hole is communicated with the outside.
3. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 2, wherein: the shape of the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is the same as that of the cross section of the through hole body perpendicular to the height direction of the outer cylinder shell.
4. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 2, wherein: the volumes of the single cavities are the same or not completely the same.
5. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 2, wherein: the cross section of the outer cylinder shell perpendicular to the height direction of the outer cylinder shell is square, the side length of the corresponding square is A, the value range of A is 1/20-1/2 of the unit cell working wavelength, the height of the unit cell is D, and the value range of D is 1/20-1/4 of the unit cell working wavelength.
6. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 5, wherein: the cross section of the through hole, which is vertical to the height direction of the through hole, is square, and the corresponding side length a is A/20-A/5; the shape of the micropores is circular, the diameter of the micropores is a/10-a, and the pore diameters of the micropores are the same or not all the same.
7. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 6, wherein: the four corners of the through hole body are connected to the corresponding corners of the outer cylinder shell through the connecting walls respectively to form four single cavities, and the cross section of each single cavity perpendicular to the height direction of the single cavity is triangular.
8. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in claim 5, wherein: thickness b of the connecting wall2Is 0.1a to 0.8 a.
9. The multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in any one of claims 1 to 8, wherein: the structures of a plurality of said unit cells are not identical.
10. A method for manufacturing the multifunctional metamaterial with low frequency sound absorption and bearing functions as claimed in any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115013120A (en) * | 2022-06-22 | 2022-09-06 | 广州美的华凌冰箱有限公司 | Silencer |
| CN115064146A (en) * | 2022-04-01 | 2022-09-16 | 哈尔滨工程大学 | Compound three-dimensional periodic sound absorption and insulation integrated acoustic superstructure |
| WO2023193412A1 (en) * | 2022-04-07 | 2023-10-12 | 同济大学 | Sound absorption and bearing integrated structure and preparation method therefor |
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2021
- 2021-11-04 CN CN202111300603.XA patent/CN114203137A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115064146A (en) * | 2022-04-01 | 2022-09-16 | 哈尔滨工程大学 | Compound three-dimensional periodic sound absorption and insulation integrated acoustic superstructure |
| WO2023193412A1 (en) * | 2022-04-07 | 2023-10-12 | 同济大学 | Sound absorption and bearing integrated structure and preparation method therefor |
| CN115013120A (en) * | 2022-06-22 | 2022-09-06 | 广州美的华凌冰箱有限公司 | Silencer |
| CN115013120B (en) * | 2022-06-22 | 2023-07-14 | 广州美的华凌冰箱有限公司 | Muffler |
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