Modal and dynamic response analysis of shock absorber for small commercial vehicles

Abstract

The dynamic response characteristics of shock absorber have a crucial influence on the stability and safety performance of vehicles. Based on the finite element method, the modal simulation of the mechanical structure of shock absorber was conducted, and the natural frequencies and modal shapes were obtained. According to the dynamic stiffness test scheme, the first four natural frequencies were set as the excitation frequencies, and the response characteristics of displacement, damping force and dynamic stiffness were tested and analyzed. In the experimental loading scheme, shear force was applied to the damper, and the shear amplitude gradually increased from 0.5 mm. Three cycle tests were conducted to obtain the average evaluation value. The results show that although the natural frequencies of the mechanical structure of the shock absorber do not avoid the excitation frequency of the road surface, it still shows good dynamic response effects at low-order excitation frequencies. The elastic stiffness and damping stiffness of the shock absorber decrease with the increase of the shear amplitude, while the damping stiffness increases with the increase of the excitation frequency.