均質化法による樹脂複合材料の遮音効果解析

概要

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We proposed a method for predicting the noise insulation levels of a resin composite cover, where the damping effect of resin is considered using viscoplastic constitutive equations and the sound pressure level is calculated by acoustic-structure coupling analysis. In this method, several parameters in the constitutive equations must be determined by experiments. It is, however, inconvenient to determine the parameters for every possible resin composite material. In this paper we introduce the homogenization method, which makes it possible to obtain the mean material constants of a composlte material and to consider the effect of shape or size of a reinforcement. First the formulation of the dynamic analysis of a resin composite material with the homogenization method is introduced, where the resin is assumed to be viscoelastic and the reinforcement is assumed to be elastic. Second the formulation is applied to the acoustic structure coupling analysis. Finally it is demonstrated that the shape or size of the reinforcement has a great influence on the noise insulation of a resin composite cover through several numerical examples.
一般社団法人日本機械学会の論文
1997-01-25