Abstract: The Method of equivalent linearization for nonlinear flutter is used to determine the region of the stable limit cycle flutter of wing-store system. Under the condition of stable limit cycle flutter, the mathematical model is further reduced to a single degree of freedom system. By means of the subharmonic bifurcation condition of single degree of freedom oscillator, for the first time, an engineering analysis method, which can predict the region of the subharmonic response of the limit cycle flutter of wing-store system, is developed in the paper. The example shows that the bifurcation condition of single degree of freedom nonlinear oscillator can indicates the motional behavior of nonlinear flutter system.

Key words: piecewise linear, limit cycle flutter, subharmonic bifurcation