多孔質材を充填した閉音場の減衰特性の解析 : モード減衰と減衰応答の高速計算法の提案

概要

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A new analytical procedure is proposed for estimating modal damping and response on acoustic cavity involving porous materials. Applying asymptonic solution method, which is proposed by Ma, to the equations of motion using acoustic finite element model in consideration of porous medea, expressions with respect to modal loss factor can be derived. The loss factor from the expressions is related to a first approximation of complex eigenvalue solution. The calculation process of damped resposes using the expressions is as fast as that of modal expansion for undamped acoustic field. The expressions corresponds to the extended version of the modal strain energy method, which is proposed by Johnson, concerning the vibration damping problem as to laminated strctures including elastic materials and viscoelastic materials. Using acoustic pipes as a numerical example, damped responses are calculated. The results are compared with exact solution and are discussed.
社団法人日本機械学会の論文
2000-08-25