Two-Dimensional Active Wing/Store Flutter Suppression Using H Theory

An active method of decoupling the wing from store pitch inertia effects is presented for the wing/store  utter suppression problem. The proposed active decoupler pylon involves the use of a piezoceramic wafer strut as an actuator, which acts as a soft spring between the wing and the store. A two-degree-of-freedom typical section of an airfoil is used to represent the structural model of an F-16 aircraft wing, and the  utter problem is studied in incompressible  ow regimewhere the circulatory component of the aero loads is modeled using Jones’ approximation to the Theodorsen function. The aerodynamic effects on the store, however, are neglected, and a controller is designedusingH 1 theory tomake the closed-loopsystem robust to such unstructured uncertainties. Under a set of design speciŽ cations quantiŽ ed as weighting functions, a mixed-sensitivityH 1 optimal control synthesis problem is solved for the design of a controller. Singular-value Bode plots of robust stability and nominal performance measures are used for the analysis of the closed-loop system.