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Energy exchange and transition to localization in the asymmetric Fermi-Pasta-Ulam oscillatory chain

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Abstract

A finite (periodic) FPU chain is chosen as a convenient model for investigating the energy exchange phenomenon in nonlinear oscillatory systems. As we have recently shown, this phenomenon may occur as a consequence of the resonant interaction between high-frequency nonlinear normal modes. This interaction determines both the complete energy exchange between different parts of the chain and the transition to energy localization in an excited group of particles. In the paper, we demonstrate that this mechanism can exist in realistic (asymmetric) models of atomic or molecular oscillatory chains. Also, we study the resonant interaction of conjugated nonlinear normal modes and prove a possibility of linearization of the equations of motion. The theoretical constructions developed in this paper are based on the concepts of “effective particles” and Limiting Phase Trajectories. In particular, an analytical description of energy exchange between the “effective particles” in the terms of non-smooth functions is presented. The analytical results are confirmed with numerical simulations.

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Authors and Affiliations

  1. N.N. Semenov Institute of Chemical Physics, RAS, 4 Kosygin str., 119991, Moscow, Russia

    Valeri V. Smirnov, Denis S. Shepelev & Leonid I. Manevitch

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  1. Valeri V. Smirnov
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  2. Denis S. Shepelev
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  3. Leonid I. Manevitch
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Correspondence to Valeri V. Smirnov.

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Smirnov, V.V., Shepelev, D.S. & Manevitch, L.I. Energy exchange and transition to localization in the asymmetric Fermi-Pasta-Ulam oscillatory chain. Eur. Phys. J. B 86, 10 (2013). https://doi.org/10.1140/epjb/e2012-30753-2

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  • DOI: https://doi.org/10.1140/epjb/e2012-30753-2

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