Global and partial enlarged bifurcation diagrams versus excitation frequency f, (a) global bifurcation diagram for 1–10 Hz with an increment step of 0.0001, (b) local bifurcation diagram for 2.1–3.2 Hz with an increment step of 0.0001, (c) local bifurcation diagram for 3.365–3.395 Hz with an increment step of 0.00001, (d) local bifurcation diagram for 4.91–5.31 Hz with an increment step of 0.0001. |