Optimization of a Vehicle Suspension Using a Semi-Active Damper 2000-01-3304

Semi-active suspension is a subject of much research in the last years. These systems achieve performances similar to those achieved by active suspensions with relative low cost, light weight and low energy consumption. In this paper, an optimized passive system, a semi-active “on-off” system and a semi-active “CVD”(Continuously Variable Damper) system are compared in relation to ride comfort and tire deflection. The numerical simulations are based on a quarter car model. The passive system is optimized to obtain the minimum body vertical acceleration and the rattlespace (suspension deflection), the tire deflection, the body velocity and the axle velocity are considered as constraints,. The control laws of the semi-active system are based on the “skyhook” theory, in which the damping coefficient is controlled actively. Numerical results show that the semi-active “CVD” system gives better ride comfort, with higher tire deflection when compared with the passive and semi-active “on-off” systems.