Partial Feedback Linearized RISE Controller for Active Flutter Suppression

Abstract

In this paper, Robust Integral of Sign of Error (RISE) based partial feedback linearized controller for active flutter suppression (AFS) of a two dimensional aerofoil is proposed. The aeroelastic system has two degrees of freedom i.e. pitch and plunge. To design the controller, linearized pitch dynamics of the aerofoil is considered. A significant feature of the proposed controller is that it does not need an accurate model of the plant as well as any knowledge of external disturbance or parametric uncertainty. Zero dynamics stability and closed loop stability of the overall system have been established. Simulations prove the robustness and efficacy of the designed controller against variation in free stream velocity, parametric uncertainty and external disturbances as compared to existing designs. Results prove that the designed controller has increased the flutter boundary by 48% more than critical flutter speed.