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The issue of introducing generic design constraints (practical or `real-life' constraints) in robust control design procedures is discussed. A strategy, based on a hierarchy of optimisation methods, is proposed here. An Hinfin design algorithm constitutes the bottom level of this hierarchy, and a general-purpose optimisation algorithm (a genetic algorithm) is employed for tuning the parameters of the Hinfin controller, searching for the solutions that satisfy the earlier mentioned `practical constraints'. Practical results obtained in a pilot-scale plant with fluid-level and flow-rate control as controlled variables are included to show the applicability of the proposed method.
Date of Publication: January 2007