Please use this identifier to cite or link to this item: https://doi.org/10.1109/TSMCB.2008.2005204
Title: Adaptive fuzzy output-feedback controller design for nonlinear time-delay systems with unknown control direction
Authors: Hua, C.-C.
Wang, Q.-G. 
Guan, X.-P.
Keywords: Adaptive fuzzy approach
Nussbaum-type function
Observer design
Output feedback
Time-delay systems
Issue Date: 2009
Source: Hua, C.-C.,Wang, Q.-G.,Guan, X.-P. (2009). Adaptive fuzzy output-feedback controller design for nonlinear time-delay systems with unknown control direction. IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics 39 (2) : 363-374. ScholarBank@NUS Repository. https://doi.org/10.1109/TSMCB.2008.2005204
Abstract: In this paper, the robust-control problem is investigated for a class of uncertain nonlinear time-delay systems via dynamic output-feedback approach. The considered system is in the strict-feedback form with unknown control direction. A full-order observer is constructed with the gains computed via linear matrix inequality at first. Then, with the bounds of uncertain functions known, we design the dynamic output-feedback controller such that the closed-loop system is asymptotically stable. Furthermore, when the bound functions of uncertainties are not available, the adaptive fuzzy-logic system is employed to approximate the uncertain function, and the corresponding output-feedback controller is designed. It is shown that the resulting closed-loop system is stable in the sense of semiglobal uniform ultimate boundedness. Finally, simulations are done to verify the feasibility and effectiveness of the obtained theoretical results. © 2008 IEEE.
Source Title: IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
URI: http://scholarbank.nus.edu.sg/handle/10635/54899
ISSN: 10834419
DOI: 10.1109/TSMCB.2008.2005204
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