A Research on the Simulation Method of Bumper Response Characteristics Based on Pulse Knocking Condition

For the transient response problem of an automobile bumper generated by pulse knocking conditions, subjective evaluation, response signal testing and statistical analysis are conducted to obtain the evaluation threshold of the shock response characteristics of the bumper. A finite element model of the bumper system is established and its accuracy is verified by modal testing. The multi-body dynamics model of bumper is established, and the response characteristics under different shock waveforms and different pulse durations are analyzed by simulating the pulse knocking conditions. The effects of the standard deviation of the load excitation, boundary frequency and energy index on the quality of the frequency response function are analyzed, and a composite pulse waveform with a predominantly initial-peak sawtooth waveform under hand knocking conditions is obtained by virtual load iterative waveform fitting method, which improves the accuracy of the simulation and provides a new guiding direction for the evaluation of the subjective and objective dynamic response characteristics and structural design of the automotive bumper.