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Hidden Hyperchaotic Attractors in a Modified Lorenz–Stenflo System with Only One Stable Equilibrium

Zhouchao Wei

College of Mechanical Engineering, Beijing University of Technology, Beijing 100124, P. R. China

School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, P. R. China

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and

Wei Zhang

College of Mechanical Engineering, Beijing University of Technology, Beijing 100124, P. R. China

Author for correspondence.

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https://doi.org/10.1142/S0218127414501272Cited by:145 (Source: Crossref)

Abstract

This paper reports the finding of a four-dimensional (4D) non-Sil'nikov autonomous system with three quadratic nonlinearities, which exhibits some behavior previously unobserved: hidden hyperchaotic attractors with only one stable equilibrium. The algebraical form of the non-Sil'nikov chaotic attractor is very similar to the hyperchaotic Lorenz–Stenflo system but they are different and, in fact, nonequivalent in topological structures. Of particular interest is the fact this system has only one stable equilibrium, but can exhibit hidden hyperchaos, chaos, periodic orbit. Moreover, the coexistence of attracting sets can be obtained in the system for some parameter values and different initial conditions, such as hyperchaotic attractor and point, hyperchaotic attractor and period orbit. To further analyze the new system, the ultimate bound and positively invariant set for the modified hyperchaotic Lorenz–Stenflo system are also obtained. Moreover, the complete mathematical characterizations for 4D Hopf bifurcation are rigorously derived and studied.

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