CN110379404B - Low-frequency noise bionic acoustic metamaterial and preparation method thereof - Google Patents
Low-frequency noise bionic acoustic metamaterial and preparation method thereof Download PDFInfo
- Publication number
- CN110379404B CN110379404B CN201910663007.4A CN201910663007A CN110379404B CN 110379404 B CN110379404 B CN 110379404B CN 201910663007 A CN201910663007 A CN 201910663007A CN 110379404 B CN110379404 B CN 110379404B
- Authority
- CN
- China
- Prior art keywords
- flexible ligament
- low
- bionic
- frequency noise
- acoustic metamaterial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Prostheses (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention belongs to the technical field of noise reduction materials, and particularly relates to a low-frequency noise bionic acoustic metamaterial and a preparation method thereof. The invention provides a low-frequency noise bionic acoustic metamaterial which comprises a rigid rectangular frame, a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament, wherein the rigid rectangular frame comprises a plurality of cells; each cell is provided with a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament through hinges; the flexible ligaments are all provided with resonators at equal intervals. The invention also provides a preparation method of the low-frequency noise bionic acoustic metamaterial, which comprises the steps of dividing the rigid rectangular frame into a plurality of cells; installing a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament on the rigid frame of each cell through hinges; and the ring resonator is connected with the flexible ligament through a hinge. The invention can effectively solve the technical problems of poor vibration reduction effect, low strength and easiness in damage of the conventional acoustic metamaterial.
Description
Technical Field
The invention belongs to the technical field of noise reduction materials, and particularly relates to a low-frequency noise bionic acoustic metamaterial and a preparation method thereof.
Background
The acoustic metamaterial is a material capable of controlling large-wavelength sound waves through a millimeter-sized structure, and has a wide prospect in the aspect of low-frequency noise treatment. In 2000, Liuzheng \29495orthe like can absorb energy transmitted by low-frequency sound waves by introducing a local resonance unit at a low frequency to generate a low-frequency forbidden band. In 2008, Yang et al fixed a mass block on a circular elastic membrane and fixed the membrane on a skeleton, and realized a 200-charge 300Hz forbidden band. Chinese patent 201210490610.5 proposes a two-dimensional two-component film type dark acoustic metamaterial with local resonance characteristics, which can absorb low-frequency sound waves in a large range. Chinese patent 201310513807.0 studies acoustic metamaterials with composite cell structures with different mass weights to achieve a wider band gap range by adjusting the weight position and mass. Chinese patent 201410235514.5 discloses a light two-component acoustic metamaterial prepared from light EVA and silica gel, and has a low-frequency band gap with a width of 73Hz within 200Hz range. However, the above-mentioned acoustic metamaterial generally has the defects of poor vibration damping effect, low strength and easy breakage, and is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a low-frequency noise bionic acoustic metamaterial and a preparation method thereof, which can effectively solve the technical problems that the existing acoustic metamaterial is poor in vibration reduction effect, low in strength and easy to damage.
The invention provides a low-frequency noise bionic acoustic metamaterial which comprises a rigid rectangular frame, a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament, wherein the rigid rectangular frame comprises a plurality of cells;
each cell is provided with the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament through hinges;
resonators are arranged on the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament at equal intervals.
Preferably, the hinge is a square hinge.
Preferably, the resonator is a ring resonator.
Preferably, the length of the unit cell is a, the length of the square hinge is b, the thicknesses of the transverse flexible ligament, the longitudinal flexible ligament, the oblique flexible ligament and the ring resonator are c, the number of the ring resonators is N, and the outermost radius of each ring resonator is RNWherein R isN＝0.1·a·(1+N)/2。
Preferably, b is in the range of 0.03-0.05-a, and c is in the range of 0.008-a-0.012-a.
Preferably, the value of N ranges from 6 to 10.
Preferably, the value range of a is 20-50 cm.
The invention also provides a preparation method of the low-frequency noise bionic acoustic metamaterial, which comprises the following steps:
step 1: dividing the rigid rectangular frame into a plurality of cells;
step 2: mounting a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament on the rigid frame of each unit cell through hinges;
and step 3: and a group of equidistant circular ring resonators are connected on the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament through hinges.
Preferably, the length of the unit cell is a, the length of the square hinge is b, the thicknesses of the transverse flexible ligament, the longitudinal flexible ligament, the oblique flexible ligament and the ring resonator are c, the number of the ring resonators is N, and the outermost radius of each ring resonator is RNWherein R isN＝0.1·a·(1+N)/2。
Preferably, the value range of b is 0.03-0.05-a;
the value range of c is 0.008 a-0.012 a;
the value range of N is 6-10;
the value range of a is 20-50 cm.
The invention has the following advantages and beneficial effects:
(1) the flexible ligament and the relevant parameters of the resonator can be designed according to the actual noise frequency, and the low-frequency noise can be processed in a targeted manner.
(2) Easy installation, wide application range and suitability for various noise source environments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic structural diagram of a low-frequency noise bionic acoustic metamaterial according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a cell in a low-frequency noise bionic acoustic metamaterial according to an embodiment of the invention;
wherein the reference numbers are as follows:
the device comprises a rigid rectangular frame 1, a unit cell 2, a transverse flexible ligament 3, a longitudinal flexible ligament 4, an oblique flexible ligament 5 and a resonator 6.
Detailed Description
The embodiment of the invention provides a low-frequency noise bionic acoustic metamaterial and a preparation method thereof, which can effectively solve the technical problems of poor vibration reduction effect, low strength and easiness in damage of the conventional acoustic metamaterial cloth.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a low-frequency noise bionic acoustic metamaterial, including a rigid rectangular frame 1, a transverse flexible ligament 3, a longitudinal flexible ligament 4, and an oblique flexible ligament 5, where the rigid rectangular frame includes a plurality of cells 2;
each cell 2 is provided with a transverse flexible ligament 3, a longitudinal flexible ligament 4 and an oblique flexible ligament 5 through hinges;
resonators 6 are mounted on the transverse flexible ligament 3, the longitudinal flexible ligament 4 and the oblique flexible ligament 5 at equal intervals.
The embodiment of the invention also provides a preparation method of the low-frequency noise bionic acoustic metamaterial, which comprises the following steps:
step 1: dividing a rigid rectangular frame 1 into a plurality of unit cells 2;
step 2: a transverse flexible ligament 3, a longitudinal flexible ligament 4 and an oblique flexible ligament 5 are arranged on the rigid frame of each unit cell 2 through hinges;
and step 3: a set of equidistant ring resonators 6 is connected by hinges to the transverse flexible ligament 3, the longitudinal flexible ligament 4 and the oblique flexible ligament 5.
The low-frequency noise bionic acoustic metamaterial provided by the embodiment of the invention can design relevant parameters of the flexible ligament and the ring resonator according to the actual noise frequency, and can be used for processing low-frequency noise in a targeted manner. The preparation method is easy to install, wide in application range and suitable for various noise source environments.
Further, the hinge is a square hinge.
Further, the resonator 6 is a ring resonator.
Furthermore, the length of the unit cell 2 is a, the length of the square hinge is b, the thicknesses of the transverse flexible ligament 3, the longitudinal flexible ligament 4, the oblique flexible ligament 5 and the annular resonator are c, the number of the annular resonators is N, and the outermost radius of the annular resonator is RNWherein R isN＝0.1·a·(1+N)/2。
The low-frequency noise bionic acoustic metamaterial provided by the embodiment of the invention can design the inherent frequency of the spider web structure unit lattice according to the noise frequency, keeps the inherent frequency and the inherent frequency basically the same, and when low-frequency noise passes through the structure, the vibration of noise sound waves can resonate with the spider web structure, so that the energy of the sound waves is consumed, the transmission of the sound waves is hindered, and the noise reduction effect is achieved
Furthermore, the value range of b is 0.03 a-0.05 a, and the value range of c is 0.008 a-0.012 a.
Further, the value range of N is 6-10.
Further, the value range of a is 20-50 cm.
Further, embodiments of the present invention divide a rigid rectangular frame into 11 × 10 small cells.
Further, the length a of the unit cell is 30cm, the length b of the square hinge joint is 1.2cm, the thicknesses c of the transverse flexible ligament, the longitudinal flexible ligament, the oblique flexible ligament, and the ring resonator are 0.3cm, the number N of the ring resonators is 8, and the outermost radius of the ring resonators is RN＝13.5cm。
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A low-frequency noise bionic acoustic metamaterial is characterized by comprising a rigid rectangular frame, a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament, wherein the rigid rectangular frame comprises a plurality of cells;
each cell is provided with the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament through hinges;
resonators are arranged on the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament at equal intervals.
2. The low frequency noise bionic acoustic metamaterial according to claim 1, wherein the hinge is a square hinge.
3. The low frequency noise bionic acoustic metamaterial according to claim 2, wherein the resonator is a ring resonator.
4. The low-frequency noise bionic acoustic metamaterial according to claim 3, wherein the unit cell is a in length, the square hinge is b in length, the transverse flexible ligament, the longitudinal flexible ligament, the oblique flexible ligament and the annular resonator are c in thickness, the number of the annular resonators is N, and the outermost radius of each annular resonator is RNWherein R isN＝0.1·a·(1+N)/2。
5. The low-frequency noise bionic acoustic metamaterial according to claim 4, wherein the value range of b is 0.03-0.05-a, and the value range of c is 0.008-a-0.012-a.
6. The low-frequency noise bionic acoustic metamaterial according to claim 4, wherein the value of N ranges from 6 to 10.
7. The low-frequency noise bionic acoustic metamaterial according to claim 4, wherein a is in a range of 20-50 cm.
8. A preparation method of the low-frequency noise bionic acoustic metamaterial according to any one of claims 1 to 7, characterized by comprising the following steps:
step 1: dividing the rigid rectangular frame into a plurality of cells;
step 2: installing a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament on the rigid frame of each cell through square hinges;
and step 3: and a group of equidistant ring resonators are connected on the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament through hinges.
9. The method for preparing a low-frequency noise bionic acoustic metamaterial according to claim 8, wherein the length of the unit cell is a, the length of the square hinge is b, the thicknesses of the transverse flexible ligament, the longitudinal flexible ligament, the oblique flexible ligament and the ring resonator are c, the number of the ring resonators is N, and the outermost radius of each ring resonator is RNWherein R isN＝0.1·a·(1+N)/2。
10. The method for preparing a low-frequency noise bionic acoustic metamaterial according to claim 8, wherein the value range of b is 0.03-a to 0.05-a;
the value range of c is 0.008 a-0.012 a;
the value range of N is 6-10;
the value range of a is 20-50 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910663007.4A CN110379404B (en) | 2019-07-22 | 2019-07-22 | Low-frequency noise bionic acoustic metamaterial and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910663007.4A CN110379404B (en) | 2019-07-22 | 2019-07-22 | Low-frequency noise bionic acoustic metamaterial and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110379404A CN110379404A (en) | 2019-10-25 |
| CN110379404B true CN110379404B (en) | 2020-09-01 |
Family
ID=68254964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910663007.4A Active CN110379404B (en) | 2019-07-22 | 2019-07-22 | Low-frequency noise bionic acoustic metamaterial and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110379404B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312203B (en) * | 2020-02-28 | 2021-03-12 | 清华大学 | Flexible acoustic metamaterial structure |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8857563B1 (en) * | 2013-07-29 | 2014-10-14 | The Boeing Company | Hybrid acoustic barrier and absorber |
| JP6043407B2 (en) * | 2015-02-27 | 2016-12-14 | 富士フイルム株式会社 | Soundproof structure and method for manufacturing soundproof structure |
| CN109643535B (en) * | 2016-08-23 | 2023-02-28 | 富士胶片株式会社 | Soundproof structure and opening structure |
| CN108492815B (en) * | 2018-05-23 | 2023-07-25 | 中国工程物理研究院总体工程研究所 | Folded beam photonic crystal with broad low band gap characteristics |
| CN109410906B (en) * | 2018-09-13 | 2020-06-23 | 温州大学 | Local resonance phononic crystal structure and sound insulation wallboard using same |
-
2019
- 2019-07-22 CN CN201910663007.4A patent/CN110379404B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110379404A (en) | 2019-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109493840B (en) | Adjustable double-layer film plate acoustic metamaterial structure based on repulsive force of permanent magnet | |
| WO2018192484A1 (en) | Acoustic material structure and method for assembling same and acoustic radiation structure | |
| NZ538187A (en) | Sound attenuating panel including a rigid frame, a sheet of flexible material and weights fixed to each sheet | |
| CN103594080A (en) | Light low-frequency wideband film metamaterial sound isolator | |
| CN110379404B (en) | Low-frequency noise bionic acoustic metamaterial and preparation method thereof | |
| CN108133700A (en) | A kind of acoustics black hole vibration and noise reducing device | |
| CN105551476B (en) | A kind of broad band low frequency sound-absorbing material based on anisotropic membrane class sub-wavelength structure | |
| CN105374348A (en) | Low-frequency ultra-wide-band-gap petal-shaped local resonance acoustic meta-material | |
| NZ599447A (en) | Acoustic panel | |
| CN112324827B (en) | Double-layer pyramid type light vibration reduction metamaterial lattice structure | |
| CN110751937A (en) | High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure | |
| CN103971671A (en) | Composite low-frequency resonance sound absorption structure | |
| CN101908338B (en) | Novel low-frequency sound insulating material | |
| CN113823254B (en) | Film type low-frequency sound insulation acoustic metamaterial with non-uniform quality and asymmetric distribution | |
| CN110366075A (en) | Loudspeaker | |
| CN218004391U (en) | Resonance phonon crystal sound insulation board based on particle damping | |
| CN218996354U (en) | Sound barrier of local resonance | |
| CN205123989U (en) | Bone conduction loudspeaker | |
| CN205232447U (en) | Bone conduction loudspeaker | |
| Cai et al. | Low frequency sound insulation performance of asymmetric coupled-membrane acoustic metamaterials | |
| Gai et al. | The effect of coaxial ring masses with different contact areas, mass, and distribution on membrane-type acoustical metamaterials’ transmission loss | |
| Hao et al. | Research on the Sound Insulation Properties of Membrane-type Acoustic Metamaterials | |
| CN214847710U (en) | Frame type thin film low-frequency sound insulation superstructure | |
| CN207852305U (en) | Absorb sound metamaterial unit | |
| CN220691708U (en) | Metamaterial sound absorbing and insulating plate suitable for transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |