Suppression of nonlinear aeroelastic vibration of a wing/store under gust effects using an adaptive-robust controller

Abstract

In this paper, a nonlinear active control scheme is applied to suppress the flutter vibration of a wing/store. The system is considered as a two dimensional airfoil with attached store. The nonlinear aero-servo-elastic model of the system is obtained based on the Lagrange's formulation. The proposed active pylon involves the piezoelectric wafer strut as the actuator. The aero loads are modeled using Theodorsen function. A gust disturbance model is also added to the system governing equations of motion. An adaptive-robust control scheme is used to suppress the flutter vibration of the wing/store system. The proposed adaptive-robust controller is a composition of the adaptive and robust controllers and so can be considered as a useful controller in presence of unknown parameter uncertainty and disturbances. Finally, the system is simulated and the controller is applied to the system to control the flutter vibrations. The results illustrate the high performance and effectiveness of the controller.