Strongly resonant bifurcations of nonlinearly coupled van der Pol-Duffing Oscillator

In this paper, the strongly resonant bifurcations of a nonlinearly coupled Van der Pol-Duffing Oscillator by the classical multi-scale method are studied. It is shown that there exist Periodic motions of a single oscillator, frequency-locking andquasi-periodic motions of two oscillators when the parameters vary. Meanwhile,some numerical results are given to test the theoretical ones.