Aperiodic stochastic resonance in a system of coupled chaotic oscillators
AbstractNoise-free aperiodic stochastic resonance is investigated numerically in a system of two coupled chaotic Rössler oscillators. The aperiodic input signal is obtained from a different chaotic system and applied either to one of the parameters of one oscillator or added to the coupling term. When the coupling constant is decreased the oscillators lose synchronization via attractor bubbling. The output signal is analyzed which reflects the sequence of synchronized (laminar) phases and non-synchronized bursts in the time evolution of the oscillators. The correlation function between the input and output signals shows maximum as a function of the coupling constant. The dependence of the correlation function on the mean frequency of oscillations of the input signal and on the parameter mismatch between the oscillators is very complex. The correlation increases non-monotonically with decreasing frequency, and the parameter mismatch can cause that the output and input signals are anticorrelated.
|Journal series||Acta Physica Polonica B, ISSN 0587-4254|
|Publication size in sheets||0.5|
|Publication indicators||= 0; = 0; : 2000 = 0.303; : 2006 = 0.882 (2) - 2007=0.576 (5)|
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