Adaptive Dynamic Sliding Mode Control for Near Space Vehicles Under Actuator Faults

A novel adaptive dynamic sliding mode (ADSM) fault-tolerant control (FTC) methodology is developed for near space vehicle attitude control systems with actuator faults in this paper. The proposed ADSM approach combines dynamic sliding mode with adaptive control strategies that can make the systems stable and accurately track the desired signals in the presence of external disturbances, model parameter uncertainties, and even actuator faults. Firstly, the attitude dynamic model of X-33 and its faulty model are introduced, then the ADSM control and fault-tolerant control laws are designed for outer-loop and inner-loop, respectively. Finally, in comparison with one existing approach, the simulation results are provided to show the effectiveness of the proposed FTC scheme.