Abstract: Using software ADINA, accurate finite element mesh models of the superposition throttle slice and fluid field are established based on the Fluid-Structure Interaction (FSI) method. The velocity property, the indicator diagram, internal pressure field and velocity field of the shock absorber are obtained using the post-processing module of ADINA. The nonlinear dynamic characteristics are analyzed. Results show that, under high-speed impact of the shock absorber oil, the pressure field inside the valves changes significantly. When reaching the valve-opening pressure, the fluid velocity suddenly jumps, making the pressure change rapidly in the damping channel. The finite element mesh models of the superposition throttle slice and fluid field significantly influence the accuracy of the simulation results. The FSI model is close to the physical reality because the consideration of the turbulent flow of oil, the contact slip and large deflection of the throttle slices. The simulation results are in good agreement with the experimental results.

Key words: vehicle engineering, gas-pressurized hydraulic damper, dynamic response characteristics of damping force, fluid-structure interaction(FSI), finite element analysis