Adaptive feedback control for nonlinear triangular systems subject to uncertain asymmetric dead-zone input

In this paper, an adaptive control strategy is proposed to investigate the issue of uncertain dead-zone input for nonlinear triangular systems with unknown nonlinearities. The considered system has no precise priori knowledge about the dead-zone feature and growth rate of nonlinearity. Firstly, a dy...

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Bibliographic Details
Published inControl theory and technology Vol. 21; no. 4; pp. 530 - 540
Main Authors Feng, Minghui, Chang, Yanjie, Duan, Zhiyu, Zhang, Xianfu
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.11.2023
Springer Nature B.V
School of Control Science and Engineering,Shandong University,Jinan 250061,Shandong,China
Subjects
Adaptive control
Closed loops
Complexity
Computational Intelligence
Control
Control and Systems Theory
Engineering
Feedback control
Hyperbolic functions
Mechatronics
Nonlinear control
Nonlinear systems
Nonlinearity
Optimization
Research Article
Robotics
State feedback
Systems Theory
Dead-zone input
Adaptive estimation
Global boundedness
Dynamic gain
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Summary:In this paper, an adaptive control strategy is proposed to investigate the issue of uncertain dead-zone input for nonlinear triangular systems with unknown nonlinearities. The considered system has no precise priori knowledge about the dead-zone feature and growth rate of nonlinearity. Firstly, a dynamic gain is introduced to deal with the unknown growth rate, and the dead-zone characteristic is processed by the adaptive estimation approach without constructing the dead-zone inverse. Then, by virtue of hyperbolic functions and sign functions, a new adaptive state feedback controller is proposed to guarantee the global boundedness of all signals in the closed-loop system. Moreover, the uncertain dead-zone input problem for nonlinear upper-triangular systems is solved by the similar control strategy. Finally, two simulation examples are given to verify the effectiveness of the control scheme.
Bibliography:ObjectType-Article-1
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ISSN:2095-6983
2198-0942
DOI:10.1007/s11768-023-00140-3