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Robust control of uncertain systems with polynomial nonlinearity by output feedback. (English) Zbl 1169.93322
Summary: The problem of global robust stabilization by output feedback is investigated for two classes of uncertain systems with polynomial nonlinearity -- one is with controllable/observable linearization and the other is not. The uncertainties in the systems are assumed to be dominated by both lower- and higher-order nonlinearities multiplying by an output-dependent growth rate. There are two ingredients in this study. One is to exploit the idea of how to handle polynomial growth conditions via homogeneity and domination without introducing an observer gain updated law. The other is the development of a recursive design algorithm for the construction of reduced-order observers, which is not only interesting in its own right but also has a valid counterpart, capable of dealing with strongly nonlinear systems, even lack of uniform observability and smooth stabilizability.

MSC:
93B35Sensitivity (robustness) of control systems
93C10Nonlinear control systems
93C41Control problems with incomplete information
93D21Adaptive or robust stabilization
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