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Adaptive fuzzy decentralized control for nonlinear large-scale systems based on high-gain observer

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Abstract

An adaptive fuzzy decentralized backstepping output-feedback control approach is proposed for a class of nonlinear large-scale systems with completely unknown functions, the interconnections mismatched in control inputs, and without the measurements of the states. Fuzzy logic systems are employed to approximate the unknown nonlinear functions, and an adaptive high-gain observer is developed to estimate the unmeasured states. Using the designed high-gain observer, and combining the fuzzy adaptive control theory with backstepping approach, an adaptive fuzzy decentralized backstepping output-feedback control scheme is developed. It is proved that the proposed control approach can guarantee that all the signals of the closed-loop system are semiglobally uniformly ultimately bounded (SUUB), and that the observer errors and the tracking errors converge to a small neighborhood of the origin by appropriate choice of the design parameters. Finally, a simulation example is provided to show the effectiveness of the proposed approach.

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Authors and Affiliations

  1. Department of Basic Mathematics, Liaoning University of Technology, Jinzhou, 121001, China

    ShaoCheng Tong, Chang’E Ren & YongMing Li

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  1. ShaoCheng Tong
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  2. Chang’E Ren
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  3. YongMing Li
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Correspondence to ShaoCheng Tong.

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Tong, S., Ren, C. & Li, Y. Adaptive fuzzy decentralized control for nonlinear large-scale systems based on high-gain observer. Sci. China Inf. Sci. 55, 228–242 (2012). https://doi.org/10.1007/s11432-011-4404-7

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  • DOI: https://doi.org/10.1007/s11432-011-4404-7

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