Dynamic Characteristics Simulation And Study On Design Mechanism Of Vehicle Hydraulic Shock Absorber

Shock absorber is an important part of the vehicle suspension system, which has direct impact on the vehicle’s comfort and safety. With the accelerated pace of vehicle product updates, design and development work get more and more attention from damper manufacturers, Meanwhile CAE technology of shock absorber dynamic characteristics is becoming a key part in it.By taking double-tube hydraulic absorber as the research object, this paper has established simulation model of the shock absorber through CAE techniques, and analyzed the impact of the shock absorber valve system parameters on dynamic characteristics combined basic valve system design theory with the simulation mode. The main research work was as follows:1. The simulation technology of shock absorber was summarized. According to the research results by the domestic and foreign scholars, the current development and deficiencies of shock absorber dynamic characteristics simulation model was clear.2. The and low-speed characteristics analysis for shock absorber was completed. The shock absorber working principle has been analyzed, and then its dynamic characteristics could been obtained through bench test for shock absorber. According to this, we can calculate the damping force in low-speed through the orifice feature analysis of shock absorber structure.3. The stiffness properties of elastic elements in valve system of shock absorber have researched. For fluid-structure interaction analysis on recovery valves, circulation valves and compression valve of shock absorber, the fluid pressure distribution in the valve system and deformation of the valve sheet group was clear, and furthermore the equivalent stiffness properties of the valve sheet group was calculated. Meanwhile, the stiffness properties of bent gasket and conical spring have been obtained by finite element analysis and experimental testing respectively.4. The dynamic characteristics simulation model of shock absorber was established. Based on the principle shock absorber structure analysis and related fluid theory or knowledge, the dynamic characteristics simulation model has been established through organic combination of each hydraulic model corresponding to shock absorber structures, and then the simulation results of this model has been verified compared with the test result.5. The design mechanism of shock absorber valves parameters has been researched. The throttle valve has been made fluid theoretical calculation and analysis based on its mathematical model. And then the impact of the shock absorber valve system parameters on dynamic characteristics has been analyzed with the dynamic characteristics simulation model.Innovations involved in the subject as follows:1. The method of fluid-structure coupling calculation is applied to hydraulic shock absorber valve group in the study of equivalent stiffness characteristics. Compared with single structure finite element analysis, the result is more accurately reflect the deformation law of the valve group under the action of oil.2. By utilizing the method of fluid-structure coupling calculation to extract the key parameters of shock absorber lumped parametric model and combining with the advantages of two kinds of simulation methods, the accuracy and practicability of the shock absorber dynamic characteristics simulation model is improved.