Finite Element Simulation of Loss Stroke Phenomenon of Shock Absorber Based on Fluid Structure Interaction

Abstract

AbstractTo provide a design reference with guaranteed performance for vehicle shock absorbers, the loss stroke mechanism is studied in this paper based on fluid–structure interaction (FSI) numerical method. According to the parametric model of cavitation mechanism and by applying fluid–structure interaction (FSI) numerical methods, the structural and fluid finite element mesh shock absorber models with high precision are both established. Furthermore, simulations for the proposed models are carried out based on ADINA software. By analyzing the simulation results, the specific position and the distribution of loss stoke, and the difference of cavitation phenomenon under diverse shock absorber loading speeds are revealed. The results indicate that cavitation of the shock absorber primarily centers around the shock absorber valve system, and this phenomenon becomes increasingly pronounced as the piston speed rises. Moreover, the cavitation effect is higher apparent when the shock absorber oil possesses higher viscosity. These findings offer valuable insights for the design and implementation of measures aimed at preventing performance distortion in shock absorbers.