Fuzzy logic based fault-tolerant attitude control for nonlinear flexible spacecraft with sampled-data input

Abstract

This paper deals with the problem of fault-tolerant control (FTC) for nonlinear flexible spacecraft subject to actuator faults and input sampling. Different from the existing approaches, the considered nonlinear flexible spacecraft is approximated by Takagi–Sugeno (T–S) Fuzzy techniques with connecting a set of linear models. To tackle the loss effectiveness of actuator, a general model of actuator failure is developed first. Then, the sampled-data input is converted into a time-delay term by input delay method, and the time delay caused by signal transmission is also taken care of here. By constructing a mixed linear-quadratic and H∞ performance, a robust FTC algorithm with less conservatism is proposed to ensure the required attitude maneuvering of flexible spacecraft in the presence of external disturbance and elastic vibration. Finally, a practical example with simulation results are carried out to show the effectiveness of the proposed FTC strategy.