CASE-HISTORY - FINITE-ELEMENT AND EXPERIMENTAL MODELING APPROACHES FOR AUTOMOTIVE NOISE-CONTROL PROBLEMS

This paper discusses issues related to the successful application of t he finite element method (FEM) and an experimental modeling approach t o automotive structure-borne noise and vibration control problems, as excited by powertrain and tire-road interaction sources from 100 Hz to 1 kHz. In this range, the system dynamics are influenced significantl y by higher-order modes of the car body and its interior acoustics. Gi ven the complexity of the overall problem, a new formulation that comb ines the FEM and measured frequency response spectra is suggested to m odel coupled powertrain-chassis-body systems. Salient features includi ng limitations are discussed and the results for two practical noise c ontrol cases are presented here. (C) 1996 Institute of Noise Control E ngineering.