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This paper investigates the problem of simultaneous fault and state estimation of either bounded state or globally Lipschtiz nonlinear systems subject to time delay and unknown input. We assume that the system has a triangular structure and the fault is a scalar and polynomial time dependent function. Based on the Lyapunov analysis method, we show that the observer design is related to neither delay...
A simple nonlinear observer with a dynamic gain is proposed for a class of bounded-state nonlinear systems subject to state delay. By saturating the states of the system nonlinearities, we show that the observer exists whatever the delay is. Furthermore, it will be highlighted that the observer design is free from any preliminary analysis of the time-delay system such as estimating the Lipschitz constants...
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