Adaptive output feedback control of uncertain nonlinear systems with input saturation
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Published:2023-05-26
Issue:13
Volume:33
Page:7623-7648
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ISSN:1049-8923
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Container-title:International Journal of Robust and Nonlinear Control
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language:en
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Short-container-title:Intl J Robust & Nonlinear
Author:
Mi Yize12ORCID,
Yao Jianyong1ORCID
Affiliation:
1. School of Mechanical Engineering Nanjing University of Science and Technology Nanjing China
2. School of Engineering Westlake University Hangzhou China
Abstract
AbstractThis article concerns with the tracking control problem for a class of control‐affine nonlinear systems subject to input saturation, parametric uncertainties and unmodeled uncertainties. The proposed scheme consists of a nested‐saturation‐function‐based controller integrated with feedforward model compensation. A saturated linear extended state observer (SLESO) and parameter adaptation law are constructed to compensate for the unmodeled uncertainties and parametric uncertainties, respectively. By using these mechanisms, the steady‐state tracking performance can be guaranteed through uncertainty compensation. Additionally, the issue of conservativeness in the input saturation problem is effectively addressed through online‐updating the available unsaturated region, which improves transient performance. The proposed scheme results in asymptotic stability when unmodeled uncertainties are constants and ultimate boundedness when unmodeled uncertainties are time‐varying. Finally, simulation studies are presented to demonstrate the effectiveness of the proposed approach.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Electrical and Electronic Engineering,Industrial and Manufacturing Engineering,Mechanical Engineering,Aerospace Engineering,Biomedical Engineering,General Chemical Engineering,Control and Systems Engineering