Abstract
The article concentrates on the finite-time fault-tolerant control for a class of nonstrict-feedback nonlinear systems subject to uncertain control gains and multiple actuator faults. First, neural networks are employed to approximate system uncertainties. By means of a vital structural attribute of neural networks, algebraic loop problem in standard backstepping control design is excluded. Then, a sliding manifold with exponential monotonic attenuation is introduced to ensure chattering-free response and robust performance. Besides, the lumped uncertainty of multiple faulty actuators is handled via applying Nussbaum gain technique and a modified Nussbaum boundedness criterion. To circumvent the issue of “complexity explosion”, a second-order command filter is introduced in every step of recursive control design. Through the proposed adaptive finite-time fault-tolerant control scheme, the influence of actuator faults can be compensated effectively, and the tracking error converges into an arbitrarily small residuum in finite time. Meanwhile, the disc domain of convergent error as well as the upper bound of settling time can be estimated. Finally, two simulations concerned with practical models are discussed. It is expounded that the proposed scheme has more efficiency and less conservatism via comparing it with other existing methods.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by Guangxi Natural Science Foundation (Grant Nos. 2023GXNSFAA026174, 2021GXNSFAA220114, 2022GXNSFAA035552, 2021GXNSFBA220033), the National Natural Science Foundation of China (Grant Nos. 61967001, 12261009), the Natural Science Basic Research Program of Shaanxi (Program No. 2023-JCQN-0008), the Middle-aged and Young Teachers’ Basic Ability Promotion Project of Guangxi (Grant No. 2023KY0680), Guangxi First-class Discipline Statistics Construction Project Fund (Grant No. TJYLXKDSJ2022B08), Guangxi University of Finance and Economics Land and Sea Economic Integration Collaborative Innovation Center (Grant No. 2022YB12), Guangxi Key Laboratory of Big Data in Finance and Economics (Grant No. FED2204), and Guangxi Colleges and Universities Key Laboratory of Quantitative Economics.
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Conceptualization, formal analysis and investigation were performed by Funing Lin, Guangming Xue and Shenggang Li. Supervision, validation and visualization were performed by Heng Liu, Yongping Pan and Jinde Cao. Writing–original draft, methodology and software were performed by Funing Lin. Writing–review & editing and data curation were performed by Guangming Xue. Funding acquisition was performed by Funing Lin, Guangming Xue and Heng Liu. All authors have read and approved the final manuscript.
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Lin, F., Xue, G., Li, S. et al. Finite-time sliding mode fault-tolerant neural network control for nonstrict-feedback nonlinear systems. Nonlinear Dyn 111, 17205–17227 (2023). https://doi.org/10.1007/s11071-023-08767-2
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DOI: https://doi.org/10.1007/s11071-023-08767-2