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Synchronization of four coupled van der Pol oscillators

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Abstract

It is possible that self-excited vibrations in turbomachine blades synchronize due to elastic coupling through the shaft. The synchronization of four coupled van der Pol oscillators is presented here as a simplified model. For quasilinear oscillations, a stability condition is derived from an analysis based on linearizing the original equation around an unperturbed limit cycle and transforming it into Hill’s equation. For the nonlinear case, numerical simulations show the existence of two well-defined regions of phase relationships in parameter space in which a multiplicity of periodic attractors is embedded. The size of these regions strongly depends on the values of the oscillator and coupling constants. For the coupling constant below a critical value, there exists a region in which a diversity of phase-shift attractors is present, whereas for values above the critical value an in-phase attractor is predominant. It is observed that the presence of an anti-phase attractor in the subcritical region is associated with sudden changes in the period of the coupled oscillators. The convergence of the coupled system to a particular periodic attractor is explored using several initial conditions. The study is extended to non-identical oscillators, and it is found that there is synchronization even over a wide range of difference among the oscillator constants.

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Authors and Affiliations

  1. Departamento de Materiales, Universidad Autónoma Metropolitana-Azcapotzalco, Av. San Pablo 180, México, D.F., 02200, Mexico

    Miguel A. Barrón

  2. Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA

    Mihir Sen

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  1. Miguel A. Barrón
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  2. Mihir Sen
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Correspondence to Miguel A. Barrón.

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Barrón, M.A., Sen, M. Synchronization of four coupled van der Pol oscillators. Nonlinear Dyn 56, 357–367 (2009). https://doi.org/10.1007/s11071-008-9402-y

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  • DOI: https://doi.org/10.1007/s11071-008-9402-y

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