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It is difficult to diagnose and accommodate the faults if disturbances and faults exist simultaneously in the controlled plants. In this paper, an anti-disturbance fault tolerant control (FTC) scheme is presented for a class of nonlinear systems with both faults and multiple disturbances. The multiple disturbances are supposed to include two types including the uncertain modeled disturbances and norm bounded uncertain disturbances. A composite fault tolerant controller is constructed by integrating a fault accommodation from diagnosis observer with additional disturbance rejection and attenuation performance for two different types of disturbances. As a result, the fault can be accommodated and the multiple disturbances can be rejected and attenuated simultaneously. Simulations for a flight control system are given to show the efficiency of the proposed approach.

This article is devoted to the problem of attitude control for rigid spacecraft subject to multiple disturbances. Due to the limited communication and storage resource, an event-triggered anti-disturbance attitude control approach is proposed for the attitude control system (ACS) with multiple disturbances. Different from some existing event-triggered attitude control methods, the multiple disturbances are considered and can be divided into an uncertain modeled disturbance and a norm bounded equivalent disturbance. A disturbance observer is designed to estimate the modeled disturbance. Based on the framework of disturbance observer-based control, the proposed event-triggered anti-disturbance controller can guarantee that the ACS converges toward a small invariant set, which successfully avoids continuous communication and Zeno phenomenon. Finally, simulation results are given to demonstrate the efficiency of the proposed approach.

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