Complex dynamical behavior and chaos control for fractional-order Lorenz-like system

doi:10.1088/1674-1056/22/4/040503

Abstract In this paper, the complex dynamical behavior for a fractional-order Lorenz-like system with two quadratic terms is investigated. The existence and uniqueness of solutions for this system are proved. The stabilities of equilibrium points are analyzed as one of system parameters changes. The pitchfork bifurcation is discussed for the first time. Then, the necessary conditions for the commensurate and incommensurate fractional-order systems to remain chaos are derived. The largest Lyapunov exponents and phase portraits are given to check the existence of chaos. Finally, the sliding mode control law is provided to make the states of the Lorenz-like system asymptotically stable. Numerical simulation results show that the presented approach can effectively guide the chaotic trajectories to the unstable equilibrium points.

Keywords: fractional-order Lorenz-like system stability analysis pitchfork bifurcation chaos control

Received: 16 August 2012
Revised: 06 October 2012
Accepted manuscript online:

PACS:	05.45.-a	(Nonlinear dynamics and chaos)
	05.45.Gg	(Control of chaos, applications of chaos)

Fund: Projected supported by the National Natural Science Foundation of China (Grant No. 11202155) and the Fundamental Research Funds for the Central Universities, China (Grant No. K50511700001).

Corresponding Authors: Li Rui-Hong
E-mail: llylrh8077@126.com

Cite this article:

Li Rui-Hong (李瑞红), Chen Wei-Sheng (陈为胜) Complex dynamical behavior and chaos control for fractional-order Lorenz-like system 2013 Chin. Phys. B 22 040503

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