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Fixed-time adaptive fault-tolerant control for uncertain nonlinear systems with actuator faults

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  • Yang, Yongxiang
  • Zhang, Lili
  • An, Liwei

Abstract

This paper considers the problem of fixed-time adaptive output feedback fault-tolerant control for a class of uncertain nonlinear pure-feedback systems with actuator failures. A fixed-time state observer is designed to estimate the system states and the fault parameters. Unlike conventional state observers with linear feedback terms, this observer employs high-order nonlinear feedback terms to achieve fixed-time stability of the estimation error. Based on this observer, a fixed-time adaptive controller is developed. The proposed control strategy ensures fixed-time stability of the system and guarantees that the tracking error converges to a predefined range.

Suggested Citation

  • Yang, Yongxiang & Zhang, Lili & An, Liwei, 2026. "Fixed-time adaptive fault-tolerant control for uncertain nonlinear systems with actuator faults," Applied Mathematics and Computation, Elsevier, vol. 516(C).
    • Handle: RePEc:eee:apmaco:v:516:y:2026:i:c:s0096300325005922
    DOI: 10.1016/j.amc.2025.129867
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    References listed on IDEAS

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    4. Yinlong Hou & Xiaoling Xu & Ruixia Liu & Xiangyun Bai & Hui Liu, 2023. "Adaptive Finite-Time Fuzzy Control for Uncertain Nonlinear Systems with Asymmetric Full-State Constraints," Mathematics, MDPI, vol. 11(20), pages 1-20, October.
    5. Truong, Hoai Vu Anh & Phan, Van Du & Tran, Duc Thien & Ahn, Kyoung Kwan, 2024. "A novel observer-based neural-network finite-time output control for high-order uncertain nonlinear systems," Applied Mathematics and Computation, Elsevier, vol. 475(C).
    6. Xu, Ke & Wang, Huanqing & Liu, Peter Xiaoping, 2023. "Adaptive fuzzy finite-time tracking control of nonlinear systems with unmodeled dynamics," Applied Mathematics and Computation, Elsevier, vol. 450(C).
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