Analysis Of Flow Field Characteristics And Structural Optimization Of Vehicle Friction Damper

The car will be affected by the iMPact of vibration in the process of driving,the vibration can reduce the ride comfort and stability of the vehicle,and is not conducive to the safety and comfort.The shock absorber plays an important role in reducing the vibration and improving the ride comfort and stability of the vehicle.With the improvement of automobile performance,it is very important to study the energy dissipation performance of vehicle shock absorber.On the basis of the previous research,a new type of friction damper is designed with the advantages of hydraulic damper and friction damper.The shock absorber is a displacement dependent damper,the damping force varies with the displacement,which can effectively control the vibration and improve the ride comfort and stability of the vehicle.In this paper,we design the absorber structure according to the design requirement of the automobile shock absorber firstly;and then research the changes of internal fluid pressure in damper through theoretical analysis and simulation analysis;at last,we optimize the damper structure based on the analysis of structural parameters effect on damper energy dissipation.The specific research contents are as follows:First,the structure of the shock absorber is designed according to the design requirements of the automobile shock absorber,which can make the output damping force meet the requirements of the automobile shock absorber;design of shock absorber inner cylinder sealing device;the fatigue analysis of the key parts of the shock absorber is carried out to ensure the structural design of the shock absorber to meet the working requirements.Second,the mathematical model of shock absorber damping force is established,which lays the foundation for the theoretical analysis of the energy dissipation performance;the dynamic oil pressure mathematical formula is established to study the variation law of the oil pressure in the shock absorber,and the influence of the structure parameters of the damper on the oil pressure is analyzed;Based on the theoretical research,the hysteretic curve of the damper is drawn,and the energy dissipation performance of the damper is analyzed.Third,the finite element model of the shock absorber is established,and the oil pressure field and the variation law of the shock absorber under different working conditions are simulated and analyzed;the influence of the structural parameters of the damper on the oil pressure is studied by means of orthogonal experimental design;according to the results of the orthogonal test,the influence law of different parameters on the oil pressure is studiedFourth,according to the design requirements of the shock absorber,the structural parameters of the damper are optimized;based on the study of the surge chamber oil pressure as the basis of the energy dissipation performance of the absorber,the hysteretic curve of the damper is drawn,and the influence of the structural parameters on the energy dissipation performance of the damper is analyzed.