On Robust, Multi-Input Sliding-Mode Based Control with a State-Dependent Boundary Layer

G. Herrmann, S. K. Spurgeon, C. Edwards

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This paper proposes a nonlinear multi-input control law using sliding mode concepts for continuous-time, uncertain, linear systems. The control law introduces a state-dependent layer around the sliding mode plane to remove chattering. This layer combines two types of boundary layers: a constant layer and a sector-shaped layer. The states will always enter the state-dependent boundary layer and the choice of the sliding mode will be seen to determine the ultimate system performance. A proof of stability shows ultimate boundedness. The controller is applied to a nonlinear simulation model of a cart-pendulum and exhibits a high degree of robustness. The new boundary layer in connection with a novel dynamically changing, state-dependent gain can be used to obtain a narrow boundary-layer shape in the operating region of interest. This permits rejection of disturbances without chattering of the control and improves on the performance expected of a sliding-mode control with constant boundary layer.
    Original languageEnglish
    Pages (from-to)89-107
    Number of pages19
    JournalJournal of Optimization Theory and Applications
    Volume129
    Issue number1
    DOIs
    Publication statusPublished - Apr 2006

    Keywords

    • Sliding-mode control
    • boundary layers
    • robust control
    • Lyapunov analysis

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