Abstract
This paper focuses on the tracking control of disturbed nonlinear system with uncertain dead-zone. Firstly, in order to weaken the influence of uncertain dead-zone, smooth inverse dead-zone model is introduced and parameterized to facilitate the control design. Then, prescribed performance function is utilized to force tracking error within decreasing and adjustable boundaries. Further, a robust technology based on the estimation of the upper bound of disturbance is employed, while the parametric adaptive law is designed, which can ensure the asymptotic stability in the presence of unknown dead-zone parameters, unknown system parameters and disturbance. The electro-hydraulic servo system is chosen for application verification, and a corresponding controller is developed based on its model and the design procedure outlined in this paper. The efficacy of the controller is confirmed through comparative simulation.
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