الفهرس 
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Abstract
This work proposes a new suspension system for vehicles through replacing passive ordinary suspension with a new low cost semi active suspension. The new proposed system consists of a hydraulic piston with proportional throttle valve mounted outside the piston’s cylinder between the two inlet ports. The throttle valve will be used to dissipate the hydraulic energy in the cylinder’s oil. To achieve the semi-active action, the throttle valve will be controlled via a controller that is designed to select the optimum opening for the valve to achieve the needed equivalent damping coefficient. Different controllers shall be investigated including artificial neural network (ANN) controller, proportional integral derivative (PID) controller and fuzzy logic controller (FLC). For the ANN, the proposed system will be controlled first by a PID controller. Different cases have been simulated to acquire data needed to train the ANN. For the fuzzy controller, different membership functions from previous literature have been implemented to the system and a new membership function is tuned to adapt with the new configuration. The proposed system is easily constructed compared with commercially available magneto-rheological (MR) damping systems with a cost down to one quarter of the (MR) dampers’ cost. MATLAB/SIMSCAPE is utilized to construct the physical model of the proposed system. The response of the vehicle with the proposed semi-active suspension systems (ANN/ FLC) will be compared with traditional passive suspension system and MR suspension system to evaluate the effectiveness of the proposed suspension system. The results showed good performance in terms of vibration reduction and response time compared with the MR semi-active system and traditional system.