الفهرس 
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Abstract
The vehicle dynamic characteristics improvement is of great interest to the designer and researchers of the road vehicle. This work deals with an investigation into the vehicle ride comfort and introduce a solution of vehicle dynamics problem.
A mathematical model of aquarter vehicle for passive, twin and active are developed these systems are compared in terms of their relative performance capabilities. The vehicle itself is treated as a rigid body undergoing vertical motions. The effect of suspension spring stiffness and damping parameters on the vehicle ride comfort are studied.
Furthermore, the influence of vehicle speed on the vehicle ride performance is investigated. Finally, amathematical model of half vehicle model for a passive suspension system is developed. The effect of front and rear suspension spring stiffness on the performance criteria are investigated.
A test rig in the nasr automotive company is used to run the experimental work with a chassis dynamometer to simulate the road surface. The effect of vehicle speed, and tyre stiffness parameter are examined. The experimental and theoretical results obtained indicated that the mathematical model produce optimistic results for the vertical body acceleration, and suspension working space. Typically, the predicted values of the suspension working space and vertical acceleration were 8 to 10% lower than those obtained in the tests. The peak resonance for the body acceleration and suspension working space at a certain frequency was similar to that obtained theoretically. The results of the tyre damping parameter has a very small effect on the vehicle ride comfort. The obtained results introduced a solution to vehicle dynamics problems.