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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.16: Poster

Donnerstag, 27. März 2003, 15:30–18:00, P1

Noise-Free Stochastic Multiresonance in Electronic Circuits — •Thomas Stemler1, Hartmut Benner1, Andrzej Krawiecki2, Krzysztof Kacperski2, and Janusz Holyst21Institut für Festkörperphysik, TU Darmstadt — 2Faculty of Physics, Warsaw University of Technology, Poland

We report the first experimental observation of noise-free stochastic multiresonance in a Chua-type nonlinear electronic oscillator close to an attractor merging crisis. Here, after the merging of two precritical sub-attractors a crisis-induced chaos-chaos intermittency is observed. Close to such a crisis the noise-free stochastic resonance, i.e. the enhancement of a weak coherent signal through the intrinsic chaotic system dynamics, can show very peculiar effects. It was shown that changes of the scaling law of the main residence time can cause several maxima of stochastic resonance (i.e. multiresonance [1] ). In our circuit the scaling law is affected by periodic windows and by the influence of internal noise. On variation of the control parameter the spectral power amplification shows multiple maxima which are characteristic for stochastic multiresonance and can be assigned to changes in the scaling behaviour.

[1] J.M.G. Vilar and J.M. Rubi, Phys. Rev. Lett. 78, 2882 (1997)

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DPG-Physik > DPG-Verhandlungen > 2003 > Dresden