A DESIGN OF ACTIVE FLUTTER SUPPRESSION CONTROL-SYSTEMS USING MU-SYNTHESIS AND CONTROLLER REDUCTION

This paper presents a control synthesis of a two-dimensional aerofoil active flutter suppression (2D-AFS) using mu synthesis and the extende d coprime factorization (weighted) (ECFW) controller reduction method in numerical simulation. A multiplicative uncertainty representation i s chosen as a structured uncertainty model of the 2D-AFS system becaus e H-infinity norm of the uncertainty due to changes in the flight velo city is calculated small by using the multiplicative uncertainty repre sentation. Controllers are designed by mu synthesis in the frame of th e robust stability and the robust control performance problems. Furthe rmore, using the ECFW controller reduction method, a seventh-order con troller whose performances are almost the same as those of the origina l controller is obtained.