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Globally stable robust tracking of nonlinear systems using variable structure control and with an application to a robotic manipulator

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2 Author(s)
Li-Chen Fu ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Liao, Teh-Lu

The globally stable robust output tracking for a class of nonlinear systems is considered. Based only on the knowledge of the bounds on the uncertainties, a variable structure control (VSC) law is developed under the structure matching assumption. It is shown that the outputs of the closed-loop system asymptotically track given output trajectories despite the uncertainties while maintaining the boundedness of all signals inside the loop. All signals inside the loop are shown to be bounded for all time. To illustrate the efficiency of the controller, the approach is applied to the case of a two degree-of-freedom (DOF) robotic manipulator with variable payload. Numerical simulation results are also provided

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Automatic Control, IEEE Transactions on  (Volume:35 ,  Issue: 12 )