Fixed-time active fault-tolerant control for dynamical systems with intermittent faults and unknown disturbances

Xuanrui Cheng, Ming Gao, Wuxiang Huai, Yichun Niu and Li Sheng

Applied Mathematics and Computation, 2025, vol. 486, issue C

Abstract: In this article, the problem of fixed-time active fault-tolerant control is investigated for dynamical linear systems with intermittent faults and unknown disturbances. Unlike traditional active fault-tolerant control, fixed-time control is taken into account in this article since intermittent faults appear and disappear within a certain period of time. The entire active fault-tolerant control framework is composed of fault detection, fault isolation, fault and state estimation as well as the reconfigurable controller. Using the homogeneity-based observers, states and faults are well estimated and a fault diagnosis scheme is proposed for the sake of detecting and isolating intermittent faults in a fixed time. The fault-tolerant controller, which provides global practical fixed-time stability of the closed-loop system, has two switching states corresponding to the appearance and disappearance of intermittent faults. As a consequence, intermittent faults are compensated via the designed active fault-tolerant control method and the system reaches practical stability with the entire convergence time bounded in a fixed time. Finally, two examples are exploited to demonstrate the effectiveness of theoretical results.

Keywords: Active fault-tolerant control; Fixed-time stability; Intermittent fault; Fault detection and isolation; Unknown but bounded disturbance (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:apmaco:v:486:y:2025:i:c:s0096300324005150

DOI: 10.1016/j.amc.2024.129054

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