Four-Scroll Hyperchaotic Attractor in a Five-Dimensional Memristive Wien Bridge Oscillator: Analysis and Digital Electronic Implementation

Figure 12

Total amplitude control dynamics by substitution of state variables x⟶x/m, y by y/m, z by z/m, by /m, and by /m shown by means of (a) phase portraits in (z, ) plane and (b) (x, z) plane for discrete values of the amplitude parameter m: m = 0.5 red; m = 0.2 blue; m = 30 black. The rest of the system (3a)–(3d) parameters are in Figure 2; t is the dimensionless time.