Research On Dynamic Temperature Variation Characteristics And Fluid-solid Coupling Analysis Of Double-cylinder Hydraulic Shock Absorber

With the gradual improvement of modern living standards,people have put forward higher requirements on the comfort performance of cars.The traditional double-cylinder hydraulic shock absorber has fallen far short of the standards required in the field of automobile vibration damping.Therefore,shock absorber companies at home and abroad have designed a series of new shock absorbers such as magnetorheological.However,most of these new shock absorbers are still in the development and research stage,and there are more or less problems such as product quality,input costs,and imperfect technology,and they cannot be widely used.Selecting a shock absorber reasonably optimized based on the existing double-cylinder hydraulic shock absorber to improve the ride comfort of the vehicle,and meeting the requirements of lower cost and higher driving performance has become an outstanding research topic.In response to this problem,the author has investigated several large domestic automobile shock absorber companies,and made a detailed study and discussion of the above issues by referring to a large number of domestic and foreign literature on improving the performance of shock absorbers.Firstly,this article introduces the internal structure composition and working principle of the double-cylinder hydraulic shock absorber from a theoretical perspective,and briefly introduces the valve system structure inside the shock absorber.A mathematical function model was used to analyze the piecewise function model of the working principle,and a characteristic curve diagram of the shock absorber was generated,which laid a theoretical foundation for the subsequent verification of the dynamic temperature change characteristics of the shock absorber and the simulation of the valve system structure.Secondly,a MTS power dynamometer from a company in the United States was used to test the dynamic characteristics of a conventional double-cylinder hydraulic shock absorber.The reliability of the shock absorber was checked from a test point of view.In conjunction with the use of OTS programmable high and low temperature test rigs,the high and low temperature characteristics of this type of double-cylinder hydraulic shock absorber were tested,and the feasibility of the normal operation of the shock absorber under high and low temperature environmental conditions was simulated.Next,a finite element model of the structure and fluid of the recovery valve system inside the shock absorber is established and further simplified.A targeted two-way fluid-structure interaction simulation analysis was performed on the internal recovery valve system and surrounding oil parts of the double-cylinder hydraulic shock absorber.By inputting parameters such as normal damping force,time,and temperature changes and setting corresponding constraints,the corresponding cloud diagrams of stress-strain and hydrodynamic changes were obtained.Based on the different changes in the parameters of the same recovery valve,the simulation results help to further improve and guide the parameter attributes(material,area,quantity,thickness,etc.)of the valve.In summary,it is a common and complex research area to improve the dynamic temperature change characteristics of a double-cylinder hydraulic shock absorber.U.S.MTS shock absorber comprehensive test bench,OTS programmable high and low temperature test bench were used to test the dynamic temperature change characteristics of the dual-cylinder hydraulic shock absorber,and ANSYS finite element simulation software was used to analyze the results of the internal recovery valve system of the shock absorber The flow field has undergone in-depth fluid-structure interaction studies,and finally obtained good simulation results such as damping characteristic test results and stress-strain simulation cloud diagrams.The research results are helpful for the improvement and optimization of the structural parameters of the shock absorber,and have important reference value for improving the ride comfort of the automobile and the reliability of the double-cylinder hydraulic shock absorber.