Study On The Characteristic Of Vehicle Energy-regenerative Type Magneto-rheological Semi-active Suspension

As the magneto-rheological damper has the features of fast response,large force,small energy demand and simple structure.Thus,it has been widely used in the system of vehicle suspension.However,it requies external power supply.Recycling,storing and using the vibration energy caused by the bumpy road when car-driving,not only can supply power to magneto-rheological damper,but also store the excess energy through the energy storage device and supply to other power components.So a simple structure of the energy-regenerative type magneto-rheological damping damper was designed,and study it by using the method of theoretical simulation and bench test.Based on the analysis of the working principle of magneto-rheological damper and linear electro-magnetic regenerative device,the structure of energy-regenerative type magneto-rheological semi-active suspension is proposed,and the random road surface input model,two-degree of freedom suspension system dynamic model,magneto-rheological damper improved polynomial model and energy-regenerative model of linear electromagnetic energy-regenerative device are established.The physical prototype of the energy-regenerative type magneto-rheological semi-active suspension was successfully developed.And also the characteristic test of the magneto-rheological semi-active suspension is done,and the parameters of polynomial model of improved magneto-rheological damper by using the Matlab software polynomial fitting toolbox Cftool are analyzed.A fuzzy controller is designed,and the dynamic performance test of the magneto-rheological semi-active suspension is carried out under the fuzzy control.The energy power and efficiency of the energy recovery system are simulated and analyzed to the potential energy,and the circuit design and module selection of the energy recovery system are carried out.Finally,the energy recovery test was carried out,and the detailed analysis is made.The simulation results show that the speed of 60 km/h and C grade road condition excitation,the acceleration of the sprung mass reduces 26.30%,the suspension deflection reduces 19.86%,the dynamic load of tire reduces 22.64%and the energy-regenerative efficiency keeps in 28.5%when comparing the energy-regenerative type magneto-rheological semi-active suspension with the passive suspension,which not only to improve the vibration performance of vehicle,but also realize the efficient recovery of vibration energy.The test results show that the acceleration of the sprung mass reduces 26.3%under the excitation of the random road surface.The voltage in composite storage device and the recovery energy value increase with the increase of frequency and amplitude,which further verifies the feasibility and control effect of the designed energy-regenerative type magneto-rheological semi-active suspension.