Aiming at the problems of how to efficiently and accurately through the finite element analysis method to obtain shock absorber throttle slice group stiffness characteristics, the finite element software is used to establish the model of the fluid-structure coupling model considering the fluid-structure coupling effect and the structural model without considering the fluid structure interaction. By solving the model and extracting the stiffness characteristics of the throttle slices found that: when the throttle slice and valve seat does not exist slot and valve deformation is small, structure model can be built to solve stiffness characteristics, when the deformation is large, fluid-structure coupling model need to be established; When the throttle slice or valve seat has slot, fluid-structure coupling model need to be set up; Different fluid velocity of the load is applied to fluid- structure coupling model, found that if the incentive is high and deformation is larger, the fluid-structure interaction model is established to solve stiffness characteristics, also found that: valve set stiffness characteristics is related to the deformation speed of the valve sheet. The greater of the throttle slice is, the weaker stiffness characteristics is. To test and verify the reliability of the above conclusions, the establishment of a certain type of the gas-precharged dual-sleeve shock absorber performance simulation model, by comparing the simulation results and experimental results shows that the conclusions above are correct and credible.
