الفهرس 
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Abstract
Ride with comfort
is the most important demand in vehicle industry as it affects directly seats mounting. For that reasons 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 dampen the vibration induced from road irregularities during vehicle maneuver before it reaches the vehicle body.
This work investigates the effect of active damping on vehicle vibrations by presenting mathematical model of full active vehicle suspensions. Thaf niOderintiodiieed a new active damper tested recently and proved to be efficient. These dampers depend on two kinds of fluids, Electro-Rheological fluid (ER) and Magneto-Rheological fluid (MR), both of them give high damping with a little power cost.
Mathematical model is introduced for the vehicle suspended by a classical damper and Electro-Rheological (ER) damper. Many types of roads are tested for vibration effect on the driver and suspension of the vehicle. These roads may be (sinusoidal road, half sine road, cosine road, irregular road, pulse road, repeated pulses road and step type).
In this work computer programs are made which include a classical damper or Electro-Rheological (ER) damper and can be used for a full vehicle suspension. Also a simulation program (MA TLAB-SIMULINK) from which any response to any changes in any parameter can be obtained. Time response curves for different types of roads are plotted for both classical and (ER) damper. A comparison between the types of roads as effect for (heave), (front) and (rear) suspension was studied. Also effect of voltage input to (ER) damper on vibration of the vehicle was investigated and it was found that increasing the voltage, is a main factor to make the amplitude of vibrations and unsteady time are minimum. Finally, it is found, (ER) damper is more efficient than classical type; and realizes a comfort for the driver of the vehicle.