(Elsevier Ltd, 2003) Mahmoud M.S.; Zribi M.; October University for Modern Science and Arts; Amer Street; Mesaha Square; Dokki-Giza; Egypt; Department of Electrical Engineering; College of Engineering and Petroleum; Kuwait University; P.O. Box 5969; 13060 Safat; Kuwait
This paper investigates the design of robust observer-based controllers for a class of uncertain linear time-lag systems. The uncertainties are assumed to be norm-bounded. We extend the previous results on quadratic-cost control to the case of observer-based control for uncertain systems with unknown state and input time-lags. By introducing an appropriate definition of quadratic stability for uncertain time-lag systems, it is shown that observer-based controllers can be constructed via solutions of linear-matrix inequalities. A simulation example is given to illustrate the theoretical developments. 2002 Elsevier Science Ltd. All rights reserved.
