Simulative Analysis of Dynamic Characteristics of Automobile Shock Absorbers Based on Fluid-structure Interaction

Abstract

The fluid-structure interaction(FSI) modeling and solving techniques of shock absorbers are studied.The fluid field grid model of damper valve and the finite element contact model of superposition throttle-slices with higher accuracy are established based on FSI method with multi-solvers.The FSI model of shock absorbers is solved and analyzed combined by finite volume method(FVM) and finite element method(FEM).The speed characteristic and indicator diagram of shock absorbers are obtained.The internal pressure field and velocity field of damper valve are analyzed.The nonlinear dynamic characteristics of superposition throttle-slices are analyzed.The simulation results show that the pressure field of core region of damper valve changes rapidly because of the impact of high speed oil.The velocity of throttle-slices steps when the valve opens and closes.It makes the throttle channel change suddenly,and makes the indicator diagram bend down at the valve-opening point.The fluid field grid model of core region of damper valve and the finite element contact model of superposition throttle-slices have great influence to the accuracy of simulation.The FSI model is closed to the physical reality because of the consideration of turbulent flow of oil and the contact slip and large deflection of throttle-slices.The simulation results are in good agreement with the experimental results.