Development of New Mode-Superposition Technique for Truncating Lower- and/or Higher-Frequency Modes : Application to Eigenmode Sensitivity Analysis

Abstract

A new mode-superposition technique with higher accuracy and efficiency was proposed by the authors in Ref. (1). This paper applies the technique to eigenmode sensitivity analysis for a structural system and a coupled acoustic-structural system. It will be shown that the use of a new mode-superposition technique greatly improves the convergency of a modal sensitivity analysis, and makes it possible to calculate the sensitivity with better efficiency than Fox and Kapoor's modal method and Wang's modified modal method, and also with better efficiency than Nelson's method. The theoretical results are verified through application of the method to a box structure and a practical vehicle interior noise problem.