2-DIMENSIONAL ACTIVE WING STORE FLUTTER SUPPRESSION USING H-INFINITY THEORY/

An active method of decoupling the vying from store pitch inertia effe cts is presented for the wing/store Butter suppression problem. The pr oposed active decoupler pylon involves the use of a piezoceramic wafer strut as an actuator, which acts as a soft spring between the wing an d 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 t he Butter problem is studied in incompressible Bow regime where the ci rculatory component of the aero loads is modeled using Jones' approxim ation to the Theodorsen function. The aerodynamic effects on the store , however, are neglected, and a controller is designed using H-infinit y theory to make the closed-loop system robust to such unstructured un certainties. Under a set of design specifications quantified as weight ing functions, a mixed-sensitivity H-infinity, optimal control synthes is problem is solved for the design of a controller Singular value Bod e plots of robust stability and nominal performance measures are used for the analysis of the closed-loop system.