|Policy Iteration Based Online Adaptive Optimal Fault Compensation Control for Spacecraft
Yanbin Du, Bin Jiang*, and Yajie Ma
International Journal of Control, Automation, and Systems, vol. 19, no. 4, pp.1607-1617, 2021
Abstract : In this paper, a novel online adaptive optimal fault-tolerant control (FTC) scheme based on policy iteration (PI) algorithm is developed for the spacecraft attitude angular velocity tracking control with actuator faults. First, for the fault-free attitude dynamic model, an adaptive optimal controller is designed based on PI algorithm to solve the Hamilton-Jacobi-Bellman (HJB) equation. In this process of solving, the value function is approximated by means of a critic neural network (NN). Then, a novel adaptive compensation law is proposed for estimation of actuator faults. The closed-loop system is proved to be uniformly ultimately bounded (UUB) via the Lyapunov’s method. Finally, the effectiveness of the proposed control scheme is evaluated via simulation experiments.
Adaptive dynamic programming, fault-tolerant control, policy iteration, spacecraft attitude dynamic System
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