阅读说明：本技术 一种可调声学超构材料结构 (Adjustable acoustic metamaterial structure ) 是由 黄唯纯 刘乐 马仁杰 杨俊鸿 颜廷标 颜学俊 钱斯文 卢明辉 于 2020-04-30 设计创作，主要内容包括：发明提供一种可调声学超构材料结构,涉及超构材料技术领域,包括波长管排体以及与波长管排体粘接的共鸣腔排体,波长管排体和共鸣腔排体在竖直方向分别设有第一腔体和第二腔体,共鸣腔排体可与后部空间联通,形成一个能够在300到4000Hz频段内实现50％以上吸声系数的结构性吸声材料单元体,波长管排体和共鸣腔排体的底部均在同一水平面上,顶部均设有背板堵头。本发明吸声系数范围大,可节省空间,延长使用寿命,减少污染。(The invention provides an adjustable acoustic metamaterial structure, which relates to the technical field of metamaterial and comprises a wavelength tube array body and a resonance cavity array body bonded with the wavelength tube array body, wherein the wavelength tube array body and the resonance cavity array body are respectively provided with a first cavity and a second cavity in the vertical direction, the resonance cavity array body can be communicated with the rear space to form a structural sound absorption material unit body capable of realizing more than 50% of sound absorption coefficient in a frequency range of 300-4000Hz, the bottoms of the wavelength tube array body and the resonance cavity array body are on the same horizontal plane, and the tops of the wavelength tube array body and the resonance cavity array body are provided with a back plate plug. The invention has large sound absorption coefficient range, can save space, prolong the service life and reduce pollution.)

1. The utility model provides an adjustable acoustics metamaterial structure unit, its characterized in that, including the wavelength tube bank body and with the resonance cavity bank body that the wavelength tube bank body bonded, the wavelength tube bank body with resonance cavity bank body is equipped with first cavity and second cavity respectively in vertical direction, the wavelength tube bank body with the top of resonance cavity bank body all is on same horizontal plane, and the bottom all is equipped with the backplate end cap.

2. The tunable acoustic metamaterial structure of claim 1, wherein the wavelength tube array includes a first array and a second array, the first array and the second array are identical in structure, and one end outer sidewall of the first array is connected with one end outer sidewall of the second array.

3. The tunable acoustic metamaterial structure of claim 2, wherein the array of resonant cavities includes a third array, a fourth array, a fifth array, a sixth array, a seventh array, an eighth array, a ninth array, and a tenth array connected to each other, and one end sidewall of the third array is connected to one end sidewall of the second array.

4. The tunable acoustic metamaterial structure of claim 3, wherein the second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth rows sequentially decrease in height in a vertical direction.

5. The tunable acoustic metamaterial structure of claim 4, wherein the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth rows are ultrasonically welded.

6. The tunable acoustic metamaterial structure of claim 4, wherein the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth rows are connected by an epoxy glue layer.

7. The tunable acoustic metamaterial structure of claim 1, wherein the back plate plugs comprise connecting strips, the upper surfaces of the connecting strips are provided with at least one block, the distance between adjacent blocks is equal, and one end of the lower surface of each connecting strip is provided with a brace.

8. The structure of claim 7, wherein the number of the first cavity and the second cavity is at least one, the cross sections of the first cavity and the second cavity are the same, the open ends of the first cavity and the second cavity are respectively in one-to-one correspondence with the positions of the blocking blocks, and the outer side wall of each blocking block is connected with the inner side wall of the first cavity or the second cavity.

9. The tunable acoustic metamaterial structure of claim 1, wherein the resonant cavity array is used in a frequency band of 300-4000 Hz.

Technical Field

The invention belongs to the technical field of metamaterial, and particularly relates to an adjustable acoustic metamaterial structure.

Background

The metamaterial generally refers to a novel multifunctional material which is not completely the same as the natural, common or common base material in characteristics, has certain innovation in functionality, or has great improvement on the original function, is artificially designed or naturally produced; the super-structure material is a novel multifunctional material which is designed manually or naturally and completely depends on a structure body designed based on different physical principles and does not depend on the material properties of the structure body; the acoustic metamaterial is an acoustic material which is completely formed by a structure designed based on different physical principles and has special acoustic functionality.

The quarter-wave tube is one of the most used and important parts of the air inlet and exhaust system of the automobile. In the air intake system, the quarter wave tube may be a separate component that eliminates frequencies in a certain medium to high frequency range. In exhaust systems, quarter-wave tubes are not typically used alone, but together with a diverging muffler, make up a multi-tube labyrinth muffler. The main factors influencing the noise elimination effect of the quarter-wave tube are as follows: (1) the length of the wave length tube; (2) the ratio of the cross-sectional area of the wavelength tube to the cross-sectional area of the main tube; the larger the ratio of the waveguide tube to the main tube cross-sectional area, the larger the amplitude of the transmission loss and the wider the bandwidth to be eliminated.

Helmholtz resonance cavity: before the electro-acoustic technology became mature, the resonance phenomenon was used to analyze the composition of composite sounds or to set the sounds in musical instruments using a set of brass spherical headband made by the german physicist helmholtz, each ball having a tube with two openings. The large tube receives external sound source, when the frequency of sound source is identical to the natural frequency of ball body, it can produce resonance, and the small tube can be inserted into the ear of musician to listen to the identified sound.

The existing industrial scale production of the acoustic super-structure material generally adopts a plastic forming technology, such as injection molding, die casting, blow molding and other processes, once the material is processed and formed, the performance is fixed, and the sound absorption frequency band cannot be adjusted according to actual needs.

Therefore, it is urgently needed to provide an adjustable acoustic super-structure material structure which has a large sound absorption coefficient range, can save space, prolong the service life and reduce pollution.

Disclosure of Invention

The invention aims to provide an adjustable acoustic metamaterial structure aiming at the defects of the existing metamaterial structure.

The invention provides the following technical scheme:

the utility model provides an adjustable acoustics metamaterial structure unit, including the wavelength bank of tubes body and with the resonance cavity row body that the wavelength bank of tubes body bonded, the wavelength bank of tubes body with the resonance cavity row body is equipped with first cavity and second cavity respectively in vertical direction, the wavelength bank of tubes body with the top of resonance cavity row body all is on same horizontal plane, and the bottom all is equipped with the backplate end cap.

Preferably, the wavelength tube bank body includes first bank body and second bank body, first bank body with the structure of second bank body is the same, the one end lateral wall of first bank body with the one end lateral wall of second bank body is connected.

Preferably, the resonance cavity array comprises a third array, a fourth array, a fifth array, a sixth array, a seventh array, an eighth array, a ninth array and a tenth array which are connected with each other, and one end side wall of the third array is connected with one end side wall of the second array.

Preferably, the heights of the second row, the third row, the fourth row, the fifth row, the sixth row, the seventh row, the eighth row, the ninth row and the tenth row in the vertical direction are sequentially reduced.

Further, the first row body, the second row body, the third row body, the fourth row body, the fifth row body, the sixth row body, the seventh row body, the eighth row body, the ninth row body and the tenth row body are welded by ultrasonic waves.

Further, the first row, the second row, the third row, the fourth row, the fifth row, the sixth row, the seventh row, the eighth row, the ninth row and the tenth row are all connected by an epoxy adhesive layer.

Preferably, the back plate plug comprises a connecting strip, at least one plug block is arranged on the upper surface of the connecting strip, the distance between every two adjacent plug blocks is equal, and a brace is arranged at one end of the lower surface of the connecting strip.

Preferably, the number of the first cavity and the second cavity is at least one, the cross sections of the first cavity and the second cavity are the same, the open ends of the first cavity and the second cavity are respectively in one-to-one correspondence with the positions of the blocking blocks, and the outer side wall of each blocking block is connected with the inner side wall of the first cavity or the second cavity.

Preferably, the frequency range of the resonance cavity array body is 300-4000 Hz.

The invention has the beneficial effects that:

(1) compared with the traditional acoustic material, the acoustic super-structure material has higher low-frequency sound absorption performance (below 1000 Hz), higher low-frequency sound absorption coefficient and lower sound absorption frequency threshold under the same material thickness;

(2) under the same low-frequency sound absorption frequency band, the required installation space is smaller, and when the material is arranged, a cavity structure is not required to be additionally arranged, so that the space is saved;

(3) the material with high environmental durability is used for manufacturing the sound absorption product, so that the service life is prolonged, and the pollution is reduced;

(4) the sound absorption effect of the unit body can be adjusted by adjusting the back plate plugs;

(5) the sound absorption effect of the unit plate can be adjusted through the unit body arrangement and combination mode.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural view of the invention;

FIG. 2 is a left side view of the invention;

FIG. 3 is a schematic structural view of a back plate plug of the present invention;

FIG. 4 is a schematic diagram of a first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;

fig. 6 is a schematic structural diagram of a third invention combination application mode.

Labeled as: 1. a first cavity; 2. a second cavity; 3. bracing; 4. a unit body; 5. a back plate plug; 6. a first row body; 7. a second row of bodies; 8. a third row of bodies; 9. a fourth bank; 10. a fifth row of bodies; 11. a sixth row of bodies; 12. a seventh row; 13. an eighth row of bodies; 14. a ninth row of bodies; 15. a tenth row body; 16. a connecting strip; 17. blocking; .

Detailed Description