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Adaptive finite-time fault-tolerant tracking control for a class of MIMO nonlinear systems with output constraints. (English) Zbl 1359.93226
Summary: In this work, we present a novel adaptive finite-time fault-tolerant control algorithm for a class of multi-input multi-output nonlinear systems with constraint requirement on the system output tracking error. Both parametric and nonparametric system uncertainties can be effectively dealt with by the proposed control scheme. The gain functions of the nonlinear systems under discussion, especially the control input gain function, can be not fully known and state-dependent. Backstepping design with a $$tan$$-type barrier Lyapunov function and a new structure of stabilizing function is presented. We show that under the proposed control scheme, finite-time convergence of the output tracking error into a small set around zero is guaranteed, while the constraint requirement on the system output tracking error will not be violated during operation. An illustrative example on a robot manipulator model is presented in the end to further demonstrate the effectiveness of the proposed control scheme.

##### MSC:
 93C40 Adaptive control/observation systems 93B35 Sensitivity (robustness) 93C10 Nonlinear systems in control theory 93C15 Control/observation systems governed by ordinary differential equations
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