RISE based Output Feedback Controller for Active Flutter Suppression of 2D Aerofoil

In this paper, Robust Integral of Sign of Error (RISE) based output feedback controller for active flutter control of a two dimensional aerofoil is designed. The aeroelastic model has two degree of freedom i.e. plunge and pitch. For developing the output feedback controller, the state space model of aerofoil has been first transformed into controllable canonical form and then RISE controller has been implemented. A significant feature of the proposed controller is that accurate model of plant as well as any knowledge of external disturbance or parametric uncertainty is not required for controller design. Stability of the closed loop aeroelastic system has been estab-lished. Comparative study of the proposed controller is done in view of variation in free stream velocity, parametric uncertainty and external disturbances. Results demonstrate the efficacy of the proposed controller by enhancing the flutter boundary of closed loop system by 38% more than critical flutter speed.