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Semiglobal output feedback control for uncertain nontriangular nonlinear systems with sector‐bounded unknown measurement
Author(s) -
Li Ting,
Yang Jun,
Li Shihua,
Guo Lei
Publication year - 2019
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/rnc.4745
Subject(s) - control theory (sociology) , bounded function , nonlinear system , controller (irrigation) , observer (physics) , computer science , function (biology) , output feedback , homogeneous , feedback controller , mathematics , control (management) , artificial intelligence , mathematical analysis , physics , quantum mechanics , combinatorics , evolutionary biology , agronomy , biology
Summary The problem of semiglobal stabilization for nontriangular nonlinear systems with unknown control coefficients and uncertain output function is investigated in this paper. By virtue of homogeneous domination technique, a novel nonrecursive design approach is presented to construct the semiglobal controller. To that end, a new output‐driven reduce‐order observer is developed to estimate the unmeasurable states. Moreover, it has been shown that we can determine the maximal sector bound of output function, in which an output feedback controller can be designed to render the closed‐loop system semiglobally stable. The effectiveness of controller is demonstrated by a ship simulation.