Abstract
In this paper, we introduce a improved perturbation analysis of eigenvalue for structural-acoustic coupled system. Two years ago, we gave the derivation of perturbation series from a standard symmetric eigenvalue, this time we give it from a non-symmetric eigenvalue problem. The coefficients of the perturbation series will be more compact because it is unnecessary to calculate the part from non-symmetric problem into symmetric one. We confirm the adequacy through some numerical examples which are calculated by NASTRAN software.
