Effect of Irregular Road on Dynamic Response of Car Seat Suspended by a Magneto-Rheological (MR) Damper
Attia E. M., Ayman .F.Z, El Gamal H.A, El Souhily B.M

Abstract
Ride with comfort is the most important demand in vehicle industry as it affects directly seats mounting. For that reason a lot of effort has been made to improve ride comfort by isolating vehicle from road irregularities as possible. That can be done by improving vehicle suspension ability to reduce the vibrations induced from road irregularities during vehicle maneuver before it reaches the vehicle seat. This work investigates the effect of active damping on vehicle vibrations by presenting mathematical model of full active vehicle suspensions. That model introduced a new active damper tested recently and proved to be efficient. These dampers depend on kind of Magneto-Rheological fluid (MR). Also a mathematical model is derived for full vehicle its seat is suspended by a classical damper or Magneto-Rheological (MR) damper. Many types of roads are tested for vibration effect on the driver and suspension of the vehicle. These roads are of types repeated pulses, repeated trapezoid bumped, repeated half sine, repeated cosine and repeated simple harmonic. Also another three different roads are taken into consideration (half sine, ramp, and sudden step type). Computer programs are constructed which include a classical damper or Magneto-Rheological (MR) damper and can be implemented on a full vehicle suspension. Also a simulation program (MATLAB-SIMULINK) from which any response to any changes in any parameter can be obtained. Time response curves for all types of roads are plotted for both classical and (MR) damper. A comparison between the types of roads as effect for seat (heave), and axle suspension was studied. Also the effect of voltage input to (MR) damper on vibration of the vehicle seat was investigated.

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