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In this paper, semi-decentralized sliding mode observers are designed for a network of homogeneous linear time invariant dynamical systems, represented in terms of a graph based on relative information. The proposed sliding mode observers reconstruct actuator faults occurring at the node itself as well as in the closed neighbourhood node set. Two distinct observer frameworks are proposed. In the first...
In this paper, a cross entropy simulation based method is used to determine the degradation of the probability of a performance metric of a robust controller exceeding its desired performance threshold level, as it degrades at regular intervals. The proposed method verified the worst case performance levels, that were determined using various existing optimisation based methods, by associating a very...
This paper proposes a method to identify and isolate actuator faults in a nonlinear benchmark satellite system Mars Express (Mex), subject to model uncertainties and sensor noise. A nonlinear sliding mode observer is designed to estimate the faults induced in the thrusters. The nonlinear Mex system gives rise to a special case of a sliding mode observer with no reduced order dynamics. The equivalent...
In this paper, a novel nonlinear observer and controller framework is suggested for achieving formation control of a cluster of satellites. Exploiting the skew symmetry in the satellite dynamics, a novel nonlinear observer which has roots in the super-twist sliding mode observer is proposed. Estimation of the entire states and unknown bounded disturbances (and also faulty, corrupted leader control...
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