Hyperchaotic Oscillation in the Deformed Rikitake Two-Disc Dynamo System Induced by Memory Effect

Figure 13

Phase portraits of system (4) with memristor W (φ) = −m + n|φ|, m = 2, n = 5, and a = 2, b = 3, c = 5, d = 0.75, and k = 1: (a) x-y plane, (b) y-z plane, and (c) y-φ plane.

(a)

(b)

(c)