Abstract
This chapter addresses the problem of fault tolerant control (FTC) for near space vehicle (NSV) attitude dynamics with multiple actuator faults. Firstly, a general actuator fault model is proposed, which integrates state-dependent bias and gain faults. Then, sliding mode observers (SMOs) are designed to provide a bank of residuals for fault detection and isolation (FDI). Based on Lyapunov stability theory, a novel fault diagnostic algorithm is proposed to detect and isolate multiple actuator faults. Further, for the two cases where the state is available or not, two accommodation schemes are proposed to compensate for the effect of the faults. These schemes do not need the condition that the bounds of the time derivative of the faults should be known. Finally, simulation results of NSV are presented to demonstrate the efficiency of the proposed FTC approach.
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