Complex dynamical behaviors of compact solitary waves in the perturbed mKdV equation

In this paper, we give a detailed discussion about the dynamical behaviors of compact solitary waves subjected to the periodic perturbation. By using the phase portrait theory, we find one of the nonsmooth solitary waves of the mKdV equation, namely, a compact solitary wave, to be a weak solution, w...

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Bibliographic Details
Published in:Chinese physics B 2014-08, Vol.23 (8), p.205-210
Main Authors: Yin, Jiu-Li, Xing, Qian-Qian, Tian, Li-Xin
Format: Article
Language:English
Subjects:
Chaos theory
Controllers
Lyapunov
Mathematical analysis
Mathematical models
mKdV方程
Perturbation methods
Solitary waves
Strength
Thresholds
保持系统
动力学行为
周期性扰动
孤波
摄动系统
紧凑型
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Summary:In this paper, we give a detailed discussion about the dynamical behaviors of compact solitary waves subjected to the periodic perturbation. By using the phase portrait theory, we find one of the nonsmooth solitary waves of the mKdV equation, namely, a compact solitary wave, to be a weak solution, which can be proved. It is shown that the compact solitary wave easily turns chaotic from the Melnikov theory. We focus on the sufficient conditions by keeping the system stable through selecting a suitable controller. Furthermore, we discuss the chaotic threshold for a perturbed system. Numerical simulations including chaotic thresholds, bifurcation diagrams, the maximum Lyapunov exponents, and phase portraits demonstrate that there exists a special frequency which has a great influence on our system; with the increase of the controller strength, chaos disappears in the perturbed system. But if the controller strength is sufficiently large, the solitary wave vibrates violently.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/8/080201