State - Feedback stabilization and control of systems with time-delay and saturating actuators

A parameter dependent approach is introduced for the design of a constant state-feedback controller that locally stabilizes linear systems with state timevarying delays and saturating actuators and achieves a prescribed performance level for all disturbances with uniformly bounded magnitudes. A polytopic representation is used to describe the saturation behavior. Del ay-dependent sufficient conditions in terms of LMIs are obtained for the existence of such a controller. An estimate is made of the domain of attraction for the disturbance-free system. The conditions for the stabilizability and H_∞ performance of the system apply the Lyapunov-Krasovskii functional and the recent descriptor approach to the control of time-delay systems, whereas the conditions for finding an ellipsoid that bounds the set of the states (in the Euclidean space) that are reachable from the origin in finite time are obtained via the Razumikhin approach.