Research On Damping Characteristics Of Parallel Energy Feedback Suspension With Less Degrees Of Freedom

In order to quickly attenuate the vibration of the body caused by uneven roads when the car is driving on uneven roads,shock absorbers are generally installed in automobile suspension systems.The traditional hydraulic shock absorber mainly relies on dissipating the energy generated during the vibration of the suspension in the form of heat energy to reduce the vibration,which will cause a great waste of energy.The use of energy recovery suspension can not only convert the energy generated by vibration into other available energy for recovery and reuse through the energy conversion system,but also the energy recovery motor can also provide the damping force required during the movement of the suspension.Ensure the smoothness and safety of the vehicle.In this paper,the following analysis is mainly carried out for a parallel energy recovery shock absorber with few degrees of freedom:By comparing the advantages and disadvantages of the existing energy recovery shock absorber structure,the less-freedom parallel structure to be studied in this paper was selected,and elaborated in detail.Based on the dual mass model of body and wheels,the dynamic characteristics of the energy recovery suspension system are analyzed.The damping characteristics of the shock absorber are analyzed.The nonlinear damping characteristics of the three-stage energy recovery shock absorber are proposed.For the matching of the damping characteristics,genetic algorithm and probability statistical method are used.The parallel connection solves the problem that the energy recovery system requires too much power for the energy recovery motor,and then matches the system parameters.Fuzzy-PID control is formed by combining Fuzzy control and PID control.The semiactive control of energy recovery motor is implemented,a control model is built,and simulation analysis is carried out.The results of simulation analysis verify the feasibility.Design and build a test bench for the energy recovery shock absorber,simulate the road surface input with a hydraulic excitation table,and conduct an experimental analysis of the damping characteristics of the energy recovery shock absorber.The results show that the energy recovery shock absorber greatly improves the vehicle performance compared with the traditional shock absorber.