A four-wing attractor and its analysis

In this paper, new properties of a four-dimensional chaotic system are investigated. These properties explain the behavior of the system and clarify why it call only generate two coexisting double-wing chaotic attractors but cannot produce a single four-wing chaotic attractor. It is shown that a new system with all extremely complex four-wing chaotic attractor and a larger positive Lyapunov exponent than the original system is formed by using these findings and introducing state feedback control to the system. Some basic dynamical behaviors and the complex structure of the new four-wing autonomous chaotic system are theoretically investigated. A detailed bifurcation analysis demonstrates the evolution process from local attractors to global attractors. The local attractors include two coexisting sinks, two coexisting single-wing periodic orbits and two coexisting double-wing chaotic attractors. The global attractors contain a diagonal double-wing periodic orbit, a diagonal double-wing chaotic attractor and a four-wing chaotic attractor. Spectral analysis indicates that the system in the four-wing chaotic mode has a very wide frequency bandwidth, confirming its random nature and its suitability to engineering applications such as secure communications. (C) 2007 Elsevier Ltd. All rights reserved.