Figure 4
Interwell motions triggered by (the first column) the out-of-phase and (the second column) in-phase interwell resonances, when the base acceleration is 6 m/s2.
In (a,b), points SN1–SN3 denote the saddle-node bifurcations where the jump-up or jump-down phenomenon of periodic oscillation can be observed. In (c), point PD means the period-doubling bifurcation, which leads to chaotic motion through a subsequent period-doubling cascade. Point NS is the Neimark–Sacker bifurcation, at which the periodic interwell motion is destabilized. In (d), points SB1 and SB2 indicate the subcritical and supercritical symmetry-breaking bifurcations, respectively.
