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- W2338803488 abstract "In this paper, the adaptive control and parameters identification problems are investigated for a class of linearly parametric strict feedback system with unknown control direction. Firstly, by using backstepping design procedure, the adaptive tracking control scheme combined with Nussbaum gain function is proposed. In the controller, the adaptive law of estimated parameters is derived from Lyapunov stability theorem and Nussbaum-type function. All the signals in closed-loop system are proved to be bounded. Secondly, the identification of unknown parameters in the strict feedback system with unknown control direction is studied. By constructing a novel Lyapunov function, a sufficient condition (PE condition), which can guarantee that the parameters estimation converge to the actual values of parameters, is obtained for the first time. Also, it is more simplified than the existing results on PE. Under the PE condition proposed here, it is shown that the parameters estimation errors are convergent to zero asymptotically by using Nussbaum function technique and Barbalat's lemma. Finally, illustrated examples are given to demonstrate the main results." @default.
- W2338803488 created "2016-06-24" @default.
- W2338803488 creator A5059470324 @default.
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- W2338803488 date "2015-12-15" @default.
- W2338803488 modified "2023-10-14" @default.
- W2338803488 title "Convergence analysis of estimated parameters for parametric nonlinear strict feedback system with unknown control direction" @default.
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- W2338803488 doi "https://doi.org/10.15388/na.2015.4.1" @default.
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