| Magnetorheological(MR)semi-active suspension,as a new type of intelligent suspension,,makes up for the disadvantage of the traditional passive suspension that damping is not adjustable.However,as an energy-consuming component,it needs external power supply,which can not guarantee the stability of its work.In order to solve the problem of energy dissipation of MR semi-active suspension,a kind of energy-regenerative MR semi-active suspension structure is designed in this paper,which can recover the vibration energy caused by vehicle driving on uneven road surface and provide power for MR semi-active suspension.This can not only control the suspension semi-actively,improve ride comfort and ride comfort,but also solve the energy consumption problem of traditional semi-active suspension to a certain extent.A energy-regenerative magnetorheological semi-active suspension structure is designed.The structure design and magnetic circuit analysis of the MR darmper under mixed working mode are carried out.The rationality of the magnetic circuit at the piston of the damper is verified by simulation.The prototype is manufactured and tested for its damping characteristics.The parameters of the MR damper model are identified according to the test results of the damping characteristics.Establish a precise hyperbolic tangent model;Tlhe control arithmetic model of MR semi-active suspension for sky-hook,ground-hook and hybrid sky-hook control algorithm is established,compare and simulate the dynamic response characteristics of suspension under the three control algorithms;establish the MR semi-active suspension energy-regenerative model,analyze the energy-regenerative characteristics and parameter sensitivity of suspension under different excitations,simulate and analyze the energy consumption of suspension system,and analyze the suspension energy realization performance.In order to reduce the energy consumption of the system,a two-mode switching suspension working method is proposed under the condition of self-supply.Finally,the energy-regenerative characteristics and dynamic response tests of the suspension are carried out on a two-degree-of-freedom suspension test platform.The simulation results show that the spring mass acceleration,suspension dynamic deflection and tire dynamic load of the suspension are reduced by 22.8%,11.21%and 6.98%respectively under the hybrid sky-hook control algorithm,and the ride comfort and ride comfort of the vehicle are obviously improved by the algorithm.The regenerative energy efficiency of the vehicle running on the C-grade road at the speed of 40 km/h can reach 15.7%,and the average regenerative energy efficiency under different sinusoidal excitations can reach 16.05%.Among the factors affecting the energy-regenerative characteristics of suspension,the driving speed has the greatest impact on the energy-regenerative characteristics;under the dual-mode switching mode,the vibration absorption performance and energy-regenerative characteristics of suspension are improved.The bench test results show that the energy supply voltage of the suspension under 1 Hz/10 mm and 2 Hz/20 mm sinusoidal excitation is 0.55V and 1.05V respectively,and the suspension can regenerate the vibration energy.Compared with passive suspension,the spring mass acceleration of MR semi-active suspension is reduced by 25.7%,and the ride comfort of the vehicle is improved to some extent by MR semi-active suspension. |
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