Abstract：The optimal layout of the damping materials has played an important role on the vibration and noise control of the vehicle. The body in white (BIW) of a certain car is studied in this paper. Based on the finite element method and boundary element method, the acoustic field and the panel contribution of the vehicle are analyzed. Then the peak frequencies in the sound pressure spectrum at the field points and their corresponding contribution panels are found out. Based on the modal analysis of the BIW, the optimal layout of the constrained damping materials is obtained. The noise responses to the excitations at the engine mount, front suspension and rear suspension are calculated, and then the validity of this technique is verified. The result of the real car experiment also shows that, after the adding of the damping materials on the vehicle body, the interior noise of the vehicle has reduced 2dB (A).
2015, Vol. 34 
