H∞ state feedback control for generalized continuous/discrete time-delay system

In this paper, we consider the problem of designing H-infinity state feedback controller for the generalized time-delay systems with delayed states and control inputs in continuous and discrete time cases, respectively. The generalized time-delay system problems are solved on the basis of linear matrix inequality (LMI) technique considering time delays. The sufficient condition for the existence of controller and H-infinity state feedback controller design methods are presented. Also, using some changes of variables and Schur complements, the obtained sufficient condition can be rewritten as an LMI form in terms of transformed variables. The proposed controller design method can be extended into the problem of robust H-infinity state feedback controller design method easily. (C) 1999 Elsevier Science Ltd. All rights reserved.