Vehicle ride comfort optimization based on Magneto-rheological damper

Abstract

Vehicle suspension design many time's leads in a compromise between the flagging demands of riding comfort and road holding. To overcome this challenge new technologies and smart materials need to be installed in vehicle dynamic systems to improve the suspension performance. This paper describes firstly the smart material (magneto rheological fluid) which can change the viscosity due to the magnetic field applied on it, this fluid is suitable for making shock absorbers which can react on different vibrations in few time less than ten milliseconds. To control the damping force of MR damper, two controllers have been designed and built in Simulink: a fuzzy logic controller and damper controller to track the desired damping force. To perform the simulation a 7 degree of freedom for vehicle dynamic model and road model was designed in CarSim software; a co-simulation model of vehicle and controller was constructed in Simulink. Finally, the comparative simulation experiments of passive suspension and semi-active suspension with magneto rheological damper was performed. The results demonstrate that, the ride comfort has been improved 18.1% compared to passive suspension and the road handling evaluation indicators were improved 10.42%. In summary, magneto rheological damper can effectively improve vehicle ride comfort and road handling.

 

Keywords

• : Vehicle ride comfort,Bouc-Wen model,Fuzzy logic controller

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