Abstract
This paper presents a general theory for analysis and design of robust pole clustering in a very general subregion /spl Omega/ of the complex plane for uncertain systems with unstructured or structured uncertainties. The pole clustering regions of interest cover any /spl Omega/-transformable and non-/spl Omega/-transformable /spl Omega/-regions which are broader than those reported in the literature. Discussions regarding robust D-stability (robust pole clustering) and quadratic D-stability (quadratic pole clustering) are presented. Based on the Rayleigh principle, three new approaches are developed for analysis of robust pole clustering in a general subregion /spl Omega/ of the complex plane. By applying these analysis results, an output-feedback robust D-stability design method is developed for a general regional-pole placement of uncertain systems.
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