SOME COMMENTS ON MODAL ANALYSIS APPLIED TO AN AUTOMOTIVE EXHAUST SYSTEM

摘要

This paper discusses the applicability and features of modal analysis techniques applied to automotive exhaust systems. Modal parameters are obtained by means of shaker as well as engine excitation (running mode analysis). During the modal analysis experiments with shaker excitation, attention is paid to the choice of the excitation signals, the excitation points, the boundary conditions and finding the suitable parameter estimation technique. Next, the estimated modal model is used to perform a reduced sensitivity analysis of the exhaust system. The correlation between the results of the modal analysis and the running mode analysis is analyzed and found discrepancies are discussed.