Technical development of eigenmode and frequency response sensitivity analysis for coupled acoustic-structural systems.

Abstract

Sensitivity analysis methods of the eigenmodes and frequency responses of coupled acoustic-structural systems are proposed for the purpose of reducing vehicle interior noise. The concept of the left and right eigenvectors with regard to coupled acoustic-structural eigenvalue problems is presented first and four propositions concerning this concept are then proven. Based on these propositions, the formulations for the modal sensitivity and modal frequency response sensitivity analyses are obtained. The theoretical results and computation equations are verified through the application of the methods to a coupled acoustic-box structure and a practical vehicle interior noise problem.