Abstract
This paper investigates the problem of finite-time adaptive output tracking control for strict-feedback nonlinear systems with parametric uncertainties. Command signals and their derivatives are generated by a new command filter based on a second-order finite-time differentiator, which attenuates the chattering phenomenon. The parameter estimations are achieved by an immersion and invariance approach without requiring the certainty equivalence principle. The finite-time adaptive controller is constructed via a backstepping design method, a finite-time command filter, and a modified fractional-order error compensation mechanism. The proposed control strategy guarantees the finite-time boundedness of all signals in the closed-loop system, and the tracking error is driven into an arbitrarily small neighborhood of the origin in finite time. Finally, the new design technique is validated in a simulation example of the electromechanical system.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant Nos. 61973179, U1813201, 61973131, 61703059), Japan Society for the Promotion of Science (Grant No. C-18K04212), Taishan Scholar Special Project Fund (Grant No. TSQN20161026), and Natural Science Foundation of Jiangsu Province (Grant No. BK20170291).
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Yu, J., Shi, P., Chen, X. et al. Finite-time command filtered adaptive control for nonlinear systems via immersion and invariance. Sci. China Inf. Sci. 64, 192202 (2021). https://doi.org/10.1007/s11432-020-3144-6
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DOI: https://doi.org/10.1007/s11432-020-3144-6