抄録
The topology optimization is considered as one of the most promising design methods which has high design capability. Our previous studies have shown that applications of the topology optimization to design devices related to wave problems is feasible by using the BEM and the level set method together. So far, we have successfully developed topology optimizations for wave devices which can minimize the intensity of waves on preset observation points. In this paper, we enhance the appliability of the topology optimization in 2D acoustics, in which we consider a topology optimization with an objective function defined on the boundary. Specifically, we consider a topology optimization to maximize the sound energy flux on the boundary of acoustic materials. By employing the topology optimization to maximize the sound energy flux on the surface of the materials, we can gain a shape of sound absorber which absorbs sound energy efficiently. In the formulation of the sound absorbing material, we use the impedance boundary condition. Datailed derivations and the optimization results of the topological derivatives for the energy flux are shown in this paper.
