Bifurcation Analysis of a Van der Pol-Duffing Circuit with Parallel Resistor

Figure 8

(a) Typical points 𝑉₁, 𝑉₂, 𝑉₃, 𝑉₄, 𝑉₅, 𝑉₆, 𝑉₇, 𝑉₈, and 𝑉₉ in the parameter space near the point 𝑅₁ (see Figure 7). (b) Phase portraits of system (1.1) for the flow restricted to the center manifold and its continuation at the points 𝑉_𝑖, 𝑖=1,…,9 of Figure 8(a).

(a)

(b)