FSI Modeling and simulation analysis of superimposed valves in flow state of hydraulic shock absorbers*

Abstract This study, through rigorous bench testing, has identified the pivotal parameters influencing the oil flow state within the shock absorber. Based on the Reynolds number parameter model, a reduced parameter model was established, incorporating the number of holes in the throttle valve, their diameters, and the diameters of the piston and piston rod as fundamental parameters. To ensure the model’s precision, this study developed high-accuracy solid and fluid finite element models, defined specific time steps for both laminar and turbulent flows along with their respective numerical methods, and executed a detailed Fluid-Structure Interaction (FSI) finite element simulation analysis. The findings indicate that fluid-structure interaction simulation accurately captures the shock absorber oil’s flow states across laminar, transitional, and turbulent phases, identifying the maximum Reynolds number position, with the simulation’s velocity-specific results aligning closely with the parameter model, showing a maximum deviation of 22%, a minimum of 2%, and an overall average error of 9.1%.