Abstract
This paper investigates the problem of fixed-time tracking control for a class of high-order nonlinear systems with matched disturbances. A novel continuous fixed-time sliding mode disturbance observer is first proposed to accurately estimate the external disturbances. Then, a new integral high-order sliding mode (IHOSM) surface is proposed in the sense of fixed-time stability by the bi-limit homogeneous method. Subsequently, utilizing the disturbance estimation information, an IHOSM-based fixed-time control scheme is proposed which can enforce the closed-loop control system reach the real sliding mode surface. Meanwhile, it is applied to an error dynamic system of a wheeled mobile robot to achieve fast accurate trajectory tracking. Finally, the comparative experiment results demonstrate the effectiveness and superiority of the proposed control approach.
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The authors sincerely appreciate to the editors and reviewers for their kind attention and valuable comments dedicated to this paper. This work was supported in part by National Natural Science Foundation of China (62073212, 61873207), and Project funded by China Postdoctoral Science Foundation (2019M661467).
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Li, B., Zhang, H., Xiao, B. et al. Fixed-time integral sliding mode control of a high-order nonlinear system. Nonlinear Dyn 107, 909–920 (2022). https://doi.org/10.1007/s11071-021-06984-1
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DOI: https://doi.org/10.1007/s11071-021-06984-1