Patent ID: 9640170
Date: 2017-05-02
CPC Classifications: G10K,Y10T

Claim:
1. A computer-implemented method for designing an acoustic cloaking material having anisotropic stiffness and an isotropic mass, comprising the following steps: selecting one or more material microstructures for a cloak; defining a variation of one or more target material properties at a plurality of locations in the cloak, wherein the target material properties include anisotropic elastic tensor (C) and isotropic mass density (ρ) properties; evaluating anisotropic elastic tensor (C) and isotropic mass density (ρ) properties of the selected material microstructures by comparison to the target material anisotropic elastic tensor (C) and isotropic mass density (ρ) properties, wherein the comparison of the material microstructures to the target material properties is performed using an elastic homogenization theory; and refining or altering the selected material microstructures, on the basis of their deviation from the target material anisotropic elastic tensor (C) and isotropic mass density (ρ) properties; Wherein the cloak includes multiple layers, and wherein the isotropic mass density (ρ) and anisotropic elastic tensor (C) properties for each layer are independently defined using separate mappings, wherein the mappings are constrained so that the material properties at the interface between layers in the volume of the cloak are substantially continuous.