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Switching-based adaptive fixed-time control for uncertain nonlinear system with asymmetric input and output constraints
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DOI：10.1080/00207721.2026.2681128.png)
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Abstract
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This paper focuses on the adaptive fixed-time control problem for uncertain nonlinear systems subject to input and output constraints. Distinct from the existing relevant literature, asymmetric constraints are considered and the bounds of the dead-zone parameters are not required to be known. Instead of adopting the piecewise Barrier Lyapunov Function, a nonlinear transformation is introduced to address the asymmetric output constraint. Furthermore, a switching-based adaptive control strategy is developed, which not only handles the unknown control signs but also compensates for the input constraint and system uncertainties. Based on the fixed-time stability theorem, an effective regulation algorithm is designed to tune the controller parameters such that the considered system is fixed-time stable and the output constraint can be ensured. Finally, a simulation example is provided to verify the effectiveness of the proposed control scheme.
Keywords:
Nonlinear system
fixed-time control
input and output constraints
nonlinear transformation
adaptive control
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