Sound Quality Prediction of Vehicle Door Closing Based on Experiment and Boundary Element Method

Abstract

The sound quality of the vehicle door can only be improved after the testing vehicle has been manufactured. In this paper, a simulation model of the door system closing collision is established, and the vehicle test and the bench test are designed. In the vehicle test, according to the design characteristics of the door structure and the situation that the operating load cannot be obtained directly. The impact load on the door are simplified as the concentrated loads when the door is closed. The reference points are arranged near the location of the concentrated loads, and the number is twice of the concentrated loads. The acceleration response at the reference points are measured. In the bench test, the frequency response functions (FRFs) from the concentrated load points to the reference points are measured. Using the inverse matrix method, the value of the concentrated loads are obtained. A boundary element model is established and the concentrated load are applied to the model to collect sound pressure signals at the field point. The results show that the sound pressure values obtained by experiment and simulation are highly consistent. It shows that this method is feasible in predicting the sound quality.