Study On Magneto-rheological Isolation System Control Simulation For Commercial Vehicle

Magneto-rheological (MR) damper, with the advantages of fast response and lowerenergy consumption, has become the current hot research topic in the field of intelligentsuspension. And the control strategy design is the key technology ofmagneto-rheological semi-active suspension. So this paper carried out the mechanicalproperties of magneto-rheological damper test, and then both the forward model andinverse model of MR damper are established by the experimental data. The numericalanalysis is employed to establish cab commercial vehicle dynamics equations of MRsemi-active suspension, the dynamic characteristics is analyzed, and the differentdamping and stiffness coefficients for transfer characteristics of the suspension system’seffect are studied. Based on PID control, fuzzy control, HSIC control strategy, the cabsuspension system for control simulation are studied. The main job is as follows:(1) The research progress of cab dynamics model and MR damper and controlmethods are introduced, the current problems of MR semi-active suspension areproposed, and the main work of this paper is summarized.(2) The working modes of the MR damper are introduced, respectively in the flowmode and shear mode of damping force is derived, and the total damping formula isobtained in the mixed mode. Damper structure type and parameter selections, and testthe operation of MR damper are carried out to obtain the indicator curves of damper andspeed curve. Based on the BP neural network, the MR damper is forward modeled,which describes the relationship between damping force, displacement, and current ofMR dampers. At the same time, a more practical inverse model is established，and themodel is verified with the testing data.(3) The evaluation index of cab isolation system is elaborated, the random roadroughness input model and three degrees of freedom1/4cab vehicle dynamics modelare established. The changes of suspension parameters(damping and stiffnesscoefficients) are analyzed to make clear the effect on the cab suspension transfercharacteristics by Simulink.(4) The commonly used evaluation methods of vibration isolation are introduced.The basic principles and methods of control strategies of PID control strategy, Fuzzycontrol strategy, and HSIC control strategy are explained respectively，and controllersimulation models are set up based on Matlab/Simulink and the corresponding toolbox. Under the pulse and random road excitation, the control effect among different control(PID control, Fuzzy control of effect, HSIC control) and uncontrolled are compared.Finally, the paper is concluded, including the flaws and the problem for furtherresearch.