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A convex approach to robust stability for linear systems with uncertain scalar parameters. (English) Zbl 1069.93027
Summary: In this paper, robust stability for linear systems with several uncertain (complex and/or real) scalar parameters is studied. A countable family of conditions sufficient for robust stability is given in terms of solvability of some simple linear matrix inequalities (LMIs). These conditions are of increasing precision, and it is shown conversely that robust stability implies solvability of these LMIs from a certain rank and beyond. This result constitutes an extension of the characterization by solvability of a Lyapunov inequality for the asymptotic stability of usual linear systems. It is based on the search of parameter-dependent quadratic Lyapunov functions, polynomial of increasing degree in the parameters.

93D09Robust stability of control systems
93D05Lyapunov and other classical stabilities of control systems
15A39Linear inequalities of matrices
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