抄録
In this paper, we propose a new topology optimization method for designing a soundproof structure that is located between an elastic panel and an acoustic cavity. The soundproof structure is assumed to consist of a poroelastic material and an elastic material. In this method, sound pressure levels radiated from an elastic panel and a soundproof structure are minimized. Air contained in the design domain and an elastic material used in the soundproof structure are approximately represented in the expression of Biot's theory that is widely applied for modeling poroelastic material. These unified expressions of the different types of material by Biot's theory allow to apply a material interpolation scheme in the density approach of topology optimization. Several numerical examples are presented to demonstrate that the proposed design method can provide clear configurations of soundproof structures that reduce mean sound pressure levels within the prescribed acoustic domai in the given frequency ranges.
