| Summary: | 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.
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