Anticontrol of chaos of the fractional order modified van der Pol systems

Anticontrol of chaos of fractional order modified van der Pol systems is studied. Addition of a constant term and addition of k∣x∣sin x term where x is a state of the system are used to anticontrol the system effectively. By applying numerical results, phase portrait, Poincaré maps and bifurcation diagrams a variety of the phenomena of the chaotic motion can be presented. Finally, it can be find that chaos under these procedures exists in the fractional order systems of a modified van der Pol system.