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Abstract
This thesis concentrated on investigation the seat suspension system performance and study the effect of air spring system replaced by coil spring system and study the effect of coil spring on the seat acceleration and effect of air pressure on the seat acceleration. Also, study the response of driver and seat for different frequency and different cushion density. from the theoretical part it can be obtained the acceleration and suspension working space (SWS) are reduced by using the air spring, and the acceleration of seat and driver are reduced by using cushion, from experimental part it can be obtained the stiffness and density relation is nonlinear. The maximum stiffness is occurring at the higher density.