FLUTTER BOUNDARY PREDICTION BASED ON NONSTATIONARY DATA MEASUREMENT

A time-domain method for the nutter boundary prediction of a wing base d on the nonstationary random response is proposed. The feature of thi s method is that a stability parameter is used as the measure of the a eroelastic stability margin instead of a conventional modal damping. T he effectiveness of a stability parameter for the nutter boundary pred iction is shown using a simple bending-torsion wing model. Numerical s tudies are conducted to examine the performance of the method under th e nonstationary condition. An application to supersonic wind-tunnel nu tter testing data shows that the proposed method is effective to the p rediction of the nutter boundary in the actual flutter testing.