In the design of active suspensions the vehicle and suspension systems are usually described by a system of linear differential equations that can be converted to state-space form. The control input to this dynamic model is provided by some actuators e.g. servovalves and the hydraulic cylinders, and the disturbance input in the road surface excitation. Using this modelling concept, the active system is realised by variations of linear state variable feedback. The results published in the literature differ in the complexity of state-space model describing the body and the suspension system of the vehicle, and also on choosing a particular observer configuration and state feedback law. This paper discusses the active suspension system design from an eigenstructure assignment viewpoint. The effect of changes in the design parameters will be illustrated by computer simulations.
Abstract