Abstract
This paper presents a robust control design for a two-dimensional airfoil active flutter suppression (2D-AFS) from the viewpoint of uncertainty model representation. Multiplicative, additive and coprime factor uncertainty models are used to present the perturbation due to change of the flight velocity in the 2D-AFS system. Controllers are then designed by μ synthesis technique in the frame of the robust stability and robust control performance problems. The controllers are reduced by the extended coprime factorization (weighted) (ECFW) controller reduction technique. As a result, the multiplicative uncertainty model is the most suitable for the robust control design of the 2D-AFS in case of the flight velocity change. A controller designed with the multiplicative uncertainty model increases the flutter velocity by 34% and shows the robustness against gust disturbance under the perturbation. Furthermore, a 7th-order controller is obtained by the ECFW controller reduction technique, which shows the same control performances as the original controller.
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