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SCIENCE CHINA Information Sciences, Volume 59, Issue 1: 012203(2016) https://doi.org/10.1007/s11432-015-5292-z

Global practical tracking via adaptive output- feedback for uncertain nonlinear systems with generalized control coefficients

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  • ReceivedNov 15, 2014
  • AcceptedDec 21, 2014
  • PublishedDec 16, 2015

Abstract

This paper investigates the global practical tracking via adaptive output-feedback for a class of uncertain nonlinear systems with generalized control coefficients. Notably, the system in question has the function-of-output control coefficients and the serious unknowns in the system and the reference signal, and hence is essentially different from the existing closely related literature. To solve the global practical tracking, a high-gain observer is first introduced to reconstruct the unmeasurable system states, and then an adaptive output-feedback controller is designed. It is worth emphasizing that the gains in the designed observer and controller are functions of time and output, for which a novel updating law of the high-gain is introduced to overcome the additional system nonlinearities and the serious unknowns mentioned above. The designed controller is shown such that all the states of the closed-loop system are globally bounded, and furthermore, tracking error will be ultimately prescribed sufficiently small. A numerical simulation is provided to demonstrate the effectiveness of the proposed approach.


Funded by

National Natural Science Foundation of China(61273084)

Independent Innovation Foundation of Shandong University(2012JC014)

National Natural Science Foundation of China(61233014)

Natural Science Foundation for Distinguished Young Scholars of Shandong Province of China(JQ200919)

National Natural Science Foundation of China(61325016)


Acknowledgment

Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant Nos. 61325016, 61273084, 61233014), Natural Science Foundation for Distinguished Young Scholars of Shandong Province of China (Grant No. JQ200919), the Independent Innovation Foundation of Shandong University (Grant No. 2012JC014). The authors are very thankful to the editor for their time/effort in handling the paper, and to the anonymous referees for their valuable comments/suggestions.


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