Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2008-11-21
Nonlinear Sciences
Chaotic Dynamics
11 pages. 11 figures, Accepted for publication in Phys. Rev. E
Scientific paper
10.1103/PhysRevE.78.066211
We identify a novel route to the birth of a strange nonchaotic attractor (SNA) in a quasiperiodically forced electronic circuit with a nonsinusoidal (square wave) force as one of the quasiperiodic forces through numerical and experimental studies. We find that bubbles appear in the strands of the quasiperiodic attractor due to the instability induced by the additional square wave type force. The bubbles then enlarge and get increasingly wrinkled as a function of the control parameter. Finally, the bubbles get extremely wrinkled (while the remaining parts of the strands of the torus remain largely unaffected) resulting in the birth of the SNA which we term as the \emph{bubbling route to SNA}. We characterize and confirm this birth from both experimental and numerical data by maximal Lyapunov exponents and their variance, Poincar\'e maps, Fourier amplitude spectra and spectral distribution function. We also strongly confirm the birth of SNA via the bubbling route by the distribution of the finite-time Lyapunov exponents.
Lakshmanan Meenakshi
Senthilkumar D. V.
Srinivasan Kartik
Thamilmaran K.
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