Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E04B-001/86
G10K-011/162
출원번호
US-0503832
(2014-10-01)
등록번호
US-9390702
(2016-07-12)
발명자
/ 주소
Mathur, Abhishek
출원인 / 주소
Acoustic Metamaterials Inc.
대리인 / 주소
Harness, Dickey & Pierce, P.L.C.
인용정보
피인용 횟수 :
1인용 특허 :
7
초록▼
An acoustic metamaterial layered composite for noise control may include a plurality of micro-perforated plates alternately and periodically arranged with a plurality of absorbent layers and optional air gaps. The plurality of micro-perforated plates may be in a form of a periodically arranged stack
An acoustic metamaterial layered composite for noise control may include a plurality of micro-perforated plates alternately and periodically arranged with a plurality of absorbent layers and optional air gaps. The plurality of micro-perforated plates may be in a form of a periodically arranged stack and include perforations extending therethrough. Each of the plurality of absorbent layers is formed of a poroelastic material. The metamaterial layered composite noise control device is designed using the metamaterial acoustics transformation approach for optimized noise control.
대표청구항▼
1. An acoustic metamaterial composite, comprising: A plurality of micro-perforated plates with perforations extending therethrough, the plurality of micro-perforated plates being in a form of a periodically arranged stack; andA plurality of absorbent layers alternately arranged with the plurality of
1. An acoustic metamaterial composite, comprising: A plurality of micro-perforated plates with perforations extending therethrough, the plurality of micro-perforated plates being in a form of a periodically arranged stack; andA plurality of absorbent layers alternately arranged with the plurality of micro-perforated plates, each of the plurality of absorbent layers being a poroeslatic material, a percentage of open area (POA) of each of the plurality of micro-perforated plates and a thickness of each of the plurality of absorbent layers determined using at least the following Equations 1 and 2, ρ_γ=det(J)(J-1)TJρ_vEquation1κ_γ=det(J)κ_vEquation2wherein ρ−r is a fluid density in a real domain, ρ−v is a fluid density in a virtual domain, κ−r is a fluid bulk modulus in a real domain, κ−v is a fluid bulk modulus in a virtual domain, and J is a Jacobian transformation. 2. The acoustic metamaterial composite of claim 1, wherein a diameter of the perforations ranges from 0.1 to 0.3 mm. 3. The acoustic metamaterial composite of claim 1, wherein a spacing between the perforations ranges from 0.2 to 0.4 mm. 4. The acoustic metamaterial composite of claim 1, wherein the perforations have an elliptical shape. 5. The acoustic metamaterial composite of claim 1, wherein the percentage of open area (POA) of each of the plurality of micro-perforated plates ranges from 0.2% to 0.7%. 6. The acoustic metamaterial composite of claim 1, wherein each of the plurality of micro-perforated plates includes at least 10 perforations per square mm. 7. The acoustic metamaterial composite of claim 1, wherein the plurality of micro-perforated plates have a sinusoidal-shape. 8. The acoustic metamaterial composite of claim 1, wherein each of the plurality of micro-perforated plates has a first thickness, each of the plurality of absorbent layers has a second thickness, and a ratio of the first thickness to the second thickness ranges from 1 to 0.00001. 9. The acoustic metamaterial composite of claim 1, wherein a porosity of each of the plurality of absorbent layers ranges from 0.8 to 0.99%. 10. The acoustic metamaterial composite of claim 1, wherein each of the plurality of absorbent layers includes a first surface and an opposing second surface, the first surface being grooved so as to have an alternating arrangement of ridges and furrows. 11. The acoustic metamaterial composite of claim 1, wherein each of the plurality of micro-perforated plates and an adjacent one of the plurality of absorbent layers defines an air layer therebetween. 12. The acoustic metamaterial composite of claim 11, wherein a thickness of the air layer ranges from 0.1 to 0.3 mm. 13. The acoustic metamaterial composite of claim 1, further comprising: a grid structure between adjacent micro-perforated plates of the plurality of micro-perforated plates, the grid structure defining a plurality of cells configured to hold sections of the plurality of absorbent layers. 14. The acoustic metamaterial composite of claim 1, further comprising: a plurality of spheres embedded within at least one of the plurality of absorbent layers. 15. The acoustic metamaterial composite of claim 1, wherein a sound absorption coefficient of the acoustic metamaterial composite ranges from 0.1 to 1 at a frequency between 10 to 20,000 Hz. 16. The acoustic metamaterial composite of claim 1, wherein a sound transmission loss of the acoustic metamaterial composite ranges from 5 to 100 dB at a frequency between 10 to 20,000 Hz. 17. The acoustic metamaterial composite of claim 1, wherein each of the plurality of micro-perforated plates reflects about 20-30% of sound waves incident thereon while a remainder of the sound waves passes therethrough and is absorbed by an adjacent one of the plurality of absorbent layers. 18. A method of manufacturing an acoustic metamaterial composite, comprising: forming a plurality of micro-perforated plates and a plurality of absorbent layers alternately arranged with the plurality of micro-perforated plates, a percentage of open area (POA) of each of the plurality of micro-perforated plates and a thickness of each of the plurality of absorbent layers determined using at least the following Equations 1 and 2, ρ_γ=det(J)(J-1)TJρ_vEquation1κ_γ=det(J)κ_vEquation2wherein ρ−r is a fluid density in a real domain, ρ−v is a fluid density in a virtual domain, κ−r is a fluid bulk modulus in a real domain, κ−v is a fluid bulk modulus in a virtual domain, and J is a Jacobian transformation.
Krasnov, Alexey; Corden, Barry B., Acoustic wall assembly having double-wall configuration and passive noise-disruptive properties, and/or method of making and/or using the same.
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