Abstract
In this paper, we propose a new topology optimization method for designing a soundproof structure consisting of a poroelastic material and an elastic material that directly minimize sound pressure levels inside an acoustic cavity by applying damping capability. The elastic material and the air medium surrounding the soundproof structure are equivalently represented in the expression of Biot's theory. With this method, a new material interpolation scheme for poroelastic materials based on the density approach is also proposed. Several design examples are presented to demonstrate that the proposed method can provide clear configurations of soundproof structures that reduce sound pressure levels within specified frequency ranges.
