Design and Optimisation of Restricted Complexity Controller: A Modal Approach for Reduced-Order Controllers

This article presents a new powerful design technique for reducing an initial high-order controller. For this, the initial closed-loop behavior is studied by modal analysis. Then, this behavior will be reproduced to a desired level of precision by re-designing the controller using the Robust Modal Control. The leading closed-loop eigenstructure of the system is assigned and the dynamic of the reduced-order controller is extracted from the relevant dynamic of the initial controller. This leads to a low-order controller, with a closed-loop behavior similar to the initial one.

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