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This paper considers the problem of actuator fault diagnosis for a class of systems with two kinds of uncertainties—unstructured uncertainty and structured one. To detect the unknown fault signals, the observer is designed for a system augmented by a dynamical model of the fault signals. It is well-known that sliding mode observers designed for systems with matched uncertainty require an upper bound...
In view of the small satellite attitude system where no gyro is available or gyro fails, the quaternion estimating angle rate of satellite is proposed by means of sliding mode observer. Based on the attitude rate estimator, the decoupling variable structure controller is designed for attitude control system. The simulation results show that the accuracy of estimating is rather high, and the variable...
In this paper, a novel sliding mode observer-based fault estimation (FE) method is presented for a class of the nonlinear networked control systems (NCSs) with Markov transfer delays. First, the nonlinear NCS is modelled by a nonlinear discrete Takagi-Sugeno (T-S) fuzzy model using Euler approximate method. Then, a sliding mode based nonlinear discrete observer is proposed such that the sliding motion...
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