OBSERVER DESIGN AND FAULT-DIAGNOSIS FOR STATE-RETARDED DYNAMICAL-SYSTEMS

In this paper, we propose a reduced-order observer, for state estimati on in a class of state-delayed dynamical systems driven by known as we ll as unknown inputs. Conditions For existence of the proposed observe r, plus the stability and convergence proof for the observer based on the Razumikhin theorem are given. Additionally, the proposed observer is utilized in an analytical-redundancy-based approach for sensor and actuator failure detection problem in the same class of time delay dyn amical systems. Finally, the applicability and effectiveness of the pr oposed FDI scheme is illustrated through numerical examples. (C) 1998 Elsevier Science Ltd. All rights reserved.