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AEROELASTICITY has been and continues to be an extremely important concern in aircraft design [1]. Dynamic aeroelastic effects such asflutter and limit-cycle oscillations (LCO) may provide critical constraints on the flight vehicle performance. Although aeroelastic instabilities can be suppressed by increasing the stiffness of the wing, the byproduct of adding weight does decrease the overall performance of the flight vehicle. A possible solution to this problem is via controlling the aeroelastic behavior by feedback to control surfaces. A review of active control methods, wind-tunnel experiments, and flight experiences associated with feedback control and aeroelasticity is presented in [2].

Currently, most aeroelasticity considerations are routinely addressed by assuming linear structural and linear aerodynamic models. However, within the last few years, there has been a significant increase in advancing methods to …