Research On Semi-Active Control Of Vehicle Suspensions Based On Magnetorheological Damper

Suspension system,as one of the important assembly of the vehicles,has a great impact on the vehicles riding comfort and security.Semi-active suspension has the advantages both of passive suspension and active suspension,and it's control effect can be close to the active suspension.Semi-active suspension is one of controllable suspension forms which have broad application prospects.Variable damper is one of the key parts of the semi-active suspension,and MR damper,using MR fluid materials,with simple structure,flexible control method,caused wide attention.Firstly,the dynamic models of the MR damper were studied and analyzed the existing mechanical models.Bouc-Wen model was selected.Based on mechanical characteristic experiments of a MR damper,its parameters were obtained.Secondly,the MR semi-active suspension model,containing MR damper,was built.Due to the strong nonlinear hysteretic characteristics of MR damper,MR semi-active suspension also had strong nonlinear.Using numerical analysis method obtained the three dynamic response,body acceleration?suspension dynamic deflection and dynamic tyre load,in the road excitation.Finally,based on the strongly nonlinear,using the theory of intelligent control strategy,fuzzy algorithm,designed controller to control it.Fuzzy control system was simulated in the Simulink,verified the feasibility of the control strategy.Through simulation experiment,the results shown that this fuzzy control semi-active suspension could effectively improve the overall performance of the vehicle suspension.Compared with the passive suspension,under the condition of random road excitation,the body acceleration and suspension dynamic schedule of MR semi-active suspension had obvious improvement.