Topology optimization of acoustic material using self-adjoint type objective function

Abstract

Improvement of the quiet performance of the car is an important factor for comfortableness during running. In particular, running noise influences ride quality. As a method for reducing noise, paste nonwoven-like sound absorbing material using a resin fiber such as polyester into the passenger compartment, it is contemplated. On the other hand, it is necessary to excessive use of the sound absorbing material is avoided because it is also required weight of the vehicle weight from the viewpoint of environmental performance. Therefore, it is important to use the minimum of the noise absorbing member in proper alignment. By applying the structural optimization techniques, it is possible to solve these problems and to perform a uniform design. Among them, topology optimization is the most design flexibility is high technique, it is applied to many problems as a structure optimization can be simultaneously determine the optimal shape and form. In this study, using the topology optimization method, find the optimal layout of the sound absorbing material to maximize the damping effect. In the input frequency, it was confirmed that there is an effect to maximize the energy dissipation.