Adaptive fuzzy output feedback control of uncertain nonlinear systems with unknown backlash-like hysteresis

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• 作者：Yongming Li^a ; ^b ; Shaocheng Tong^a ; ^{jztsc@sohu.com} ; Tieshan Li^b
• 关键词：Output feedback ; Adaptive fuzzy control ; Backlash-like hysteresis ; Backstepping design ; Stability analysis
• 刊名：Information Sciences
• 出版年：2012
• 期刊代码：62_00200255
• 类别：cp
• 出版时间：1 September, 2012
• 卷：198
• 期：Complete
• 页码：130-146
• 文件大小：836 K

摘要

In this paper, the problem of adaptive fuzzy output-feedback control is investigated for a class of uncertain nonlinear systems with unknown backlash-like hysteresis and unmeasured states. The fuzzy logic systems are used to approximate the nonlinear system functions, and a fuzzy state observer is designed to estimate the unmeasured states. By utilizing the fuzzy state observer, and combining the adaptive backstepping technique with adaptive fuzzy control design, an observer-based adaptive fuzzy output-feedback control approach is developed. It is proved that the proposed control approach can guarantee that all the signals in the closed-loop system are semi-globally uniformly ultimately bounded (SUUB), and both observer error and tracking error can converge to a small neighborhood of the origin. Two simulations are included to illustrate the effectiveness of the proposed approach.