Non-linear Characteristics Of Vehicle Suspension To Random Excitation

The car suspensions usually are made up of spring, damper and orientedequipment. However according to control power, it can be divided into three majortypes——passive control, active control and half active control. As a new damper,magnetorheological dampers made from the magnetorheological fluid arecharacterized by the fast response, continuously modulatory damper, low power,strong damper power, wide dynamic range, fast frequency response, etc.. Due to allthese attributes, it becomes superior substitute for the traditional dampers.First this paper points out that adopting different model to magnetorheologicaldampers for unique advantage each other, by contrasting and analyzing parametermodel and non-parameter model. Furthermore the text summarizes more accuratelyapplicable mathematic model in the interest of damper design and controller design.Secondly through analyzing Bouc-Wen model numerically,it reveals the influence ofthe 14 parameters to damper power of magnetorheological damper. Hence we candesign appropriate magnetorheological damper availably for concretely engineeringapplication. Thirdly the text studies the car suspension with magnetorheologicaldamper in the random theory and simulates the system in Matlab&Simulink.Contrasting this system with linear system, we draw a conlusion that adoptingBouc-Wen model just describe the attribute of the suspension more actually andwhich show for the improvement of the riding comfort, taking a good controll strategyis necessary. Furthermore the article discusses the responses of the car suspensionunder half active adjustable magnetorheological damper control,passive control,halfactive on-off control and active control riding on sinuous road and random road. Andin conclusion magnetorheological damper is adaptive to the car control engineeringwith excellent application value.Nonlinear lies in car system everywhere. So the control strategy have alreadychanged from linear control to nonlinear control. Continuously this article arguesabout the random attribute of the car suspension in consideration of the nonlinearspring and proceeds the outlook to the square distance in FPK equation. The textjudges the condition of the coupling solution with output and disturbance in thenonlinear suspension control system by the differential calculus. Proving the activesuspension with the nonlinear spring accord with that condition. Then after linearizedthe nonlinear system, we bring the optimization control into effect in suspension andgot the good result.Over the textual research, we can say if passing the new good product in adoption,making use of a type of control strategy effectively, the whole function characteristiccan be increased, the comfort of the riding can be improved, the stability of therunning can be enhanced. Finally the modern car can be perfect on the end.