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Adaptive compensators for perturbed positive real infinite-dimensional systems

Ruth Curtain;  Michael Demetriou;  Kazufumi Ito — 2003

International Journal of Applied Mathematics and Computer Science

The aim of this investigation is to construct an adaptive observer and an adaptive compensator for a class of infinite-dimensional plants having a known exogenous input and a structured perturbation with an unknown constant parameter, such as the case of static output feedback with an unknown gain. The adaptive observer uses the nominal dynamics of the unperturbed plant and an adaptation law based on the Lyapunov redesign method. We obtain conditions on the system to ensure uniform boundedness of...

Absolute stability results for well-posed infinite-dimensional systems with applications to low-gain integral control

Hartmut Logemann;  Ruth F. Curtain — 2010

ESAIM: Control, Optimisation and Calculus of Variations

We derive absolute stability results for well-posed infinite-dimensional systems which, in a sense, extend the well-known circle criterion to the case that the underlying linear system is the series interconnection of an exponentially stable well-posed infinite-dimensional system and an integrator and the nonlinearity satisfies a sector condition of the form () ≤ 0 for some constant . These results are used to prove convergence and stability properties of low-gain integral feedback control applied...

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