Study on dynamic characteristic analysis of vehicle shock absorbers based on bidirectional fluid–solid coupling

Abstract

To design a high-quality vehicle shock absorber, the internal structure of the piston assembly of a shock absorber is analyzed in this study. Using the fluid–solid coupling method, a high-precision flow grid model and a solid finite element model of the stacked valve are built and analyzed. A bidirectional fluid–solid coupling method is proposed, which can be adopted to simulate and analyze the dynamic nonlinear response characteristics for a stacked valve slice of a vehicle shock absorber in Workbench software. The results indicate that the superposition valve slice maximum occurs at the inner radius, but the area of maximum deformation is near the piston hole and the maximum deformation is about 0.0636 mm. When the stack valve plate just opens the valve, the displacement and speed of the stack valve plate will simultaneously produce a jump change. The results of the calculation analysis are broadly in line with the test results, which indicates that the bidirectional fluid–solid coupling method is accurate and dependable, and can be used to study the dynamic characteristics of vehicle shock absorbers. This has important reference value for the optimization design of the internal valve system of vehicle shock absorbers.

Keywords

• vehicle shock absorber
• fluid–solid coupling
• stacked valve slice
• dynamic characteristics