Adaptive Fuzzy Output-Feedback Controller Design for Nonlinear Time-Delay Systems With Unknown Control Direction

作者：Hua Chang Chun^*; Wang Qing Guo; Guan Xin Ping

来源：IEEE Transactions on Systems, Man, and Cybernetics - Part B: Cybernetics , 2009, 39(2): 363-374.

DOI：10.1109/TSMCB.2008.2005204

• Adaptive fuzzy approach
• Nussbaum-type function
• observer design
• output feedback
• time-delay systems

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.

• 出版日期2009-4
• 单位燕山大学; 中国科学院电工研究所