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		Weisheng CHEN,Junmin LI.[en_title][J].Control Theory and Technology,2006,4(4):313~320.[Copy]

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WeishengCHEN,JunminLI
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Received:September 09, 2005Revised:April 04, 2006

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Adaptive output feedback control for nonlinear time-delay systems using neural network

Weisheng CHEN, Junmin LI

(Department of Applied Mathematics, Xidian University, Xi’an Shaanxi 710071, China)

Abstract:

This paper extends the adaptive neural network (NN) control approaches to a class of unknown output feedback nonlinear time-delay systems. An adaptive output feedback NN tracking controller is designed by backstep- ping technique. NNs are used to approximate unknown functions dependent on time delay. Delay-dependent filters are introduced for state estimation. The domination method is used to deal with the smooth time-delay basis functions. The adaptive bounding technique is employed to estimate the upper bound of the NN approximation errors. Based on Lyapunov- Krasovskii functional, the semi-global uniform ultimate boundedness of all the signals in the closed-loop system is proved. The feasibility is investigated by two illustrative simulation examples.

Key words: Time delay Nonlinear system Neural network Backstepping Output feedback Adaptive control