Development of New Mode-Superposition Technique for Truncating The Lower-and/or Higher Frequency Modes. 2nd Report, An Application for Eigenmode Sensitivity Analysis.

Abstract

A new mode-superposition technique with higher accuracy and efficiency was proposed by the authors in Part 1. This paper applies the technique to eigenmode sensitivity analysis for a structural system or a coupled acoustic-structural system. It would be shown that the use of a new mode-superposition technique greatly improves the convergence of a modal sensitivity analysis, and makes it possible to calculate the sensitivity with better efficiency than Fox-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.