Application Research of Statistical Energy Analysis on Vehicle Sound Package

A whole vehicle SEA model is established by hybrid method combining body structure and sound package. Modal density, damping loss factorand sound package material parameters are obtained by testing and then applied into the vehicle model. The vehicle acoustic performances are tested at both ideal running condition and operating condition, and the tested results at ideal running condition are used to correct the SEA model. The outer cavity sound pressuretested in vehicle at operating conditionis used as the excitation for prediction of the interiornoise. The difference between the predicted interiornoise and the tested results is less than 3 dB(A), which shows good correlation. Two optimized methods are proposed to reduce a vehicle interiornoise by 1 ~ 3 dB(A) without the changes of weight.