الفهرس 
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Abstract
Active suspension systems improve the vehicle’s stability, ride comfort and load carrying capacity by introducing a controllable external force. Yet it hasn’t been widespread economically implemented in today’s vehicles due to its high cost and power consumption. The current study investigates the Electro-hydraulic active suspension performance and compares it with conventional passive system by a quarter car model both experimentally via the developed test-rig and numerically using SIMULINK®’s Simscape™ library. Both systems are modeled as one degree of freedom. The main aim is to study the general performance of a PID controlled active system under varying conditions in low frequency range and to develop the validation process. First, experimental work was carried out and fine-tuned until acceptable results were obtained. Then numerical model was created under the same experimental parameters and successfully validated. Finally, a parametric study was performed on the validated model to compare both active and passive system’s performance under variable conditions. The active system proved to be superior to passive in all cases. The active system improves the ride comfort, doesn’t get affected with external loads and improves the vehicle’s stability. The details of the developed system with the analytical and experimental results are presented.