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This paper presents an experimental implementation of an active control system used to suppress°utter in a typical section airfoil. The H 2 optimal control system design is based upon experimental system identi¯cations of the transfer functions between three measured system variables: pitch, plunge, and°ap position and a single control signal which commands the°ap of the airfoil. Closed-loop response of the airfoil demonstrated gust-alleviation below the open-loop°utter-boundary. In addition, the°utter boundary was extended by 12.4% through the application of active control. Cursory robustness tests demonstrate stable control for variations in°ow-speed of §10%.

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