Acoustic metamaterial architectured composite layers, methods of manufacturing the same, and methods for noise control using the same

摘要

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.

主权项

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; and A 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)TJ⁢ρ_vEquation⁢⁢1κ_γ=det⁡(J)⁢κ_vEquation⁢⁢2 wherein 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.