Effect of discretized transfer paths on abnormal vibration analysis and door structure improvement to reduce its vibration in the door slamming event

Abstract

The slamming acoustic of a vehicle door is objectively not associated to the inherent character of the automobile however it is associated to the inherent structure of the vehicle door, which is an vital subjective performance to evaluate the vehicle. Vehicle exterior noise is the air borne noise created by this structural vibration in the slamming event. This paper investigates the effect of discretized transfer paths on the abnormal vibration and adapts a modified door structure to reduce its vibration in the door slamming event based on a transfer path analysis (TPA) approach. The total number of discretized transfer paths has been chosen as 3, 5, 7, 9, and 11, i.e., this corresponds to Case 1, 2, 3, 4, and 5, respectively. Based on bench tests and lab experiments, frequency response functions (FRF) and responses of reference points and target points corresponding the aforementioned five cases are obtained. Then transient impact loads of excitation points are calculated based totally on the TPA method. Results exhibit that the model with a larger number of discretized transfer paths could provide more transfer information from the excitation source to the target and has larger root mean square errors (RMSE) between the simulation outcomes and experimental record. However, the model with a larger number of transfer paths will be time-consuming for experiments. In addition, a modified design of the glass run channel rear is implemented and the magnitude of the FRFs between the excitation point and the target has been dramatically decreased. Based on the modified design all transfer paths’ contributions have been decreased.