Abstract
An sensitivity analysis method for the eigenproblem of coupled acoustic-structural systems is proposed, which is to be applied for reducing the vehicle interior noise. At first the conception of the left eigenvector and right eigenvector with regard to coupled acoustic-structural eigenproblems is introduced, and four propositions concerning this conception are then proved. On the basis of these propositions, the formulation of the eigenmode sensitivity analysis is obtained. The eigenmode sensitivity formulations are applicable to the change of structural parameters, acoustic parameters and acoustic-structural coupling conditions respectively. By estimating the calculation error of this method theoretically, a guideline of the design variable change limit is shown. The theoretical results and computation formulations are demonstrated through a cubic shell interior noise problem.
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