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2:1 and 1:1 frequency-locking in fast excited van der Pol–Mathieu–Duffing oscillator

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Abstract

The frequency-locking area of 2:1 and 1:1 resonances in a fast harmonically excited van der Pol–Mathieu–Duffing oscillator is studied. An averaging technique over the fast excitation is used to derive an equation governing the slow dynamic of the oscillator. A perturbation technique is then performed on the slow dynamic near the 2:1 and 1:1 resonances, respectively, to obtain reduced autonomous slow flow equations governing the modulation of amplitude and phase of the corresponding slow dynamics. These equations are used to determine the steady state responses, bifurcations and frequency-response curves. Analysis of quasi-periodic vibrations is carried out by performing multiple scales expansion for each of the dependent variables of the slow flows. Results show that in the vicinity of both considered resonances, fast harmonic excitation can change the nonlinear characteristic spring behavior from softening to hardening and causes the entrainment regions to shift. It was also shown that entrained vibrations with moderate amplitude can be obtained in a small region near the 1:1 resonance. Numerical simulations are performed to confirm the analytical results.

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Authors and Affiliations

  1. Laboratory of Mechanics, University Hassan II-Aïn Chock, PB 5366, Maârif, Casablanca, Morocco

    Mohamed Belhaq

  2. Department of Mathematics, FST Mohammadia, University Hassan II-Mohammadia, Mohammadia, Morocco

    Abdelhak Fahsi

Authors
  1. Mohamed Belhaq
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  2. Abdelhak Fahsi
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Correspondence to Mohamed Belhaq.

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Belhaq, M., Fahsi, A. 2:1 and 1:1 frequency-locking in fast excited van der Pol–Mathieu–Duffing oscillator. Nonlinear Dyn 53, 139–152 (2008). https://doi.org/10.1007/s11071-007-9302-6

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  • DOI: https://doi.org/10.1007/s11071-007-9302-6

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