Abstract
This paper studies the fixed-time fuzzy adaptive tracking control problem for a class of uncertain strict-feedback nonlinear systems with unknown virtual control coefficients (UVCCs), full state constraints and external disturbances. A novel barrier Lyapunov function is constructed to overcome the UVCCs and the state constraints simultaneously. Fuzzy-logic systems are implemented to approximate uncertain nonlinear functions of the system. Using fuzzy-logic systems and the first-order filter, the dynamic surface control is combined with backstepping design to tackle the problem of computational complexity. Based on the Lyapunov stability theory, a fixed-time fuzzy controller is designed such that not only the closed-loop system is practically fixed-time stable but also the tracking error converge to a small neighborhood of the origin. It is shown that the settling time of the proposed control method is independent of the initial conditions of the controlled system. At last, a simulation example of a single-link robot manipulator is given to demonstrate the effectiveness of the presented scheme.
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Acknowledgements
This work was supported in part by the National Natural Science Foundation of China (Grant on. 12171124); and the Science Research Foundation for Introduced Talents, Fujian Provience of China (Grant on. GY-Z21215, GY-Z21216).
Funding
National Natural Science Foundation of China,12171124,Yujing Shi,Science Research Foundation for Introduced Talents,Fujian Provience of China,GY -Z21215,Yujing Shi,GY—Z21216,Yujing Shi.
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Wang, C., Shi, Y. Fixed-Time Fuzzy Adaptive Tracking Control of Full-State Constrained Nonlinear Systems with Unknown Virtual Control Coefficients. Int. J. Fuzzy Syst. 26, 196–211 (2024). https://doi.org/10.1007/s40815-023-01588-w
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DOI: https://doi.org/10.1007/s40815-023-01588-w