Nonlinear flutter wind tunnel test and numerical analysis of folding fins with freeplay nonlinearities

(in lingua inglese)

The divergence speed is increased by the existence of the freeplay when the angle of attack is 0
. A larger freeplay results in a higher divergent speed. Results based on the linear flutter analysis could ensure flight safety. The vibrational frequency decreases with increasing flow velocity. The nonlinear aeroelastic governing equation is established by the developed free interface component mode synthesis method. The trends of the divergent and convergent speeds are the same as those in the wind tunnel test. The analysis method established by the present work could be used to calculate the vibrational characteristics of folding structures and the critical velocity could be predicted precisely.