Title: Analysis of Discretization for Transient Impact Loads on Door Closing
text: The transient impact load generated by door closing is used as the input of the closing condition, which is an important part of door system investigation. In this article, the basic theory of transfer path analysis (TPA) is introduced to handle the abnormal vibration of the front-left door with the glass down stall position of a certain vehicle during the closure. The transient impact loads are discretized under the closed door and obtained using the inverse matrix (IM) method in TPA. Vehicle test and bench test are conducted. The closed door is subjected to the transient impact loads of the sealing strip and the latch on the body side. In the vehicle test, acceleration sensors are pasted on the target point and the reference point on the door to obtain the acceleration vibration response upon the door closure. In the bench test, when the hammer strikes the excitation points, the frequency response functions (FRFs) from these points to the reference point and to the target point are recorded by the acceleration sensors. The vibration amplitude of the front-left door with the glass down stall position is taken as the criterion. Finally, a reasonable discretization number of the door-closing transient impact loads is determined, which provides guidance for subsequent research of the door system.