The Effect of angle of attack on limit cycle oscillations for high-aspect-ratio wings

In this study, the eect of the angle of attack on the aeroelastic characteristicsof high aspect ratio wing models with structural nonlinearities in unsteady subsonicaerodynamic ows is investigated. the studied wing model is a cantilever wing withag, lag and torsion vibrations and with large deection capability, in accordance withthe hodges-dowell wing model. an unsteady low speed incompressible air ow is assumedto include the ow time lags. variations of the limit cycle amplitudes and frequency withfree stream velocity at dierent angle of attacks are carefully studied. for the consideredmodel, the angle of attack has little eect on utter velocity but its eect on limit cycleamplitudes and frequency is considerable. this study shows that the limit cycle amplitudesare very sensitive to variations in angles of attack.