Title: Fault-tolerant sliding mode control for the interferometer system under the unanticipated faults

Authors: Yufeng Shi; Chunjie Zhou; Xiongfeng Huang; Quan Yin

Addresses: Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China. ' Department of Control Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China

Abstract: The important precision control of the interferometer suffers from various faults in the complex space environment. However, the studies for the fault-tolerant control (FTC) in the interferometer are few. This paper first presents an active FTC scheme for the interferometer system in the presence of micro-gravity, micro-vibration and thermal disturbances in space. Kinds of unanticipated faults are quickly detected by the residue detection. Neural network is used to estimate the unanticipated faults online. The sliding mode control with a reaching law is designed for the normal control with a fixed upper bound and for the FTC with an adaptive upper bound adjusted by the neural network to recover the system performance under the faults. Stability analysis is performed by the Lyapunov theorem. Numerical simulations are used to verify the significant improved performance of the proposed FTC scheme.

Keywords: transient faults; fault detection; fault tolerant control; FTC; sliding mode control; fault tolerant SMC; neural networks; unanticipated faults; interferometer control; microgravity; microvibration; thermal disturbances; space travel; stability analysis; space-borne equipment; satellites; spacecraft.

DOI: 10.1504/IJMIC.2012.048268

International Journal of Modelling, Identification and Control, 2012 Vol.16 No.4, pp.353 - 362

Published online: 17 Dec 2014 *

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