Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2003-05-22
Nonlinear Sciences
Chaotic Dynamics
20 pages, 24 eps figures, 2 gif figures, use elsart.cls, accepted for publication in Chaos,Solitons & Fractals(2003)
Scientific paper
Transition from chaotic to quasi-periodic phase in modified Lorenz model is analyzed by performing the contact transformation such that the trajectory in ${\Vec R}^3$ is projected on ${\Vec R}^2$. The relative torsion number and the characteristics of the template are measured using the eigenvector of the Jacobian instead of vectors on moving frame along the closed trajectory. Application to the circulation of a fluid in a convection loop and oscillation of the electric field in single-mode laser system are performed. The time series of the eigenvalues of the Jacobian and the scatter plot of the trajectory in the transformed coordinate plane $X-Z$ in the former and $|X|-|Z|$ in the latter, allow to visualize characteristic pattern change at the transition from quasi-periodic to chaotic. In the case of single mode laser, we observe the correlation between the critical movement of the eigenvalues of the Jacobian in the complex plane and intermittency.
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