Boundary-layer features in conservative nonlinear oscillations

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This paper considers (1 + 1) dimensional conservative oscillatory systems with polynomial nonlinearities in the double limit of high amplitude (xmax → ∞) and high leading power (x2N+1, N → ∞). In this limit, hitherto not studied in the literature, such systems exhibit behavior akin to boundary layer phenomena: The characteristics of the solution are determined by a vanishingly small segment of the amplitude near ± xmax. The oscillating entity, x(t), tends to a periodic saw-tooth shape of linear segments, the velocity, x′(t), tends to a periodic step-function and the x − x′ phase-space plot tends to a rectangle. This is demonstrated by transforming x and t into scaled variables, η and θ, respectively. η(θ) is (2-π) periodic in θ and bounded (|η(θ)|≤ 1). For large xmax, the zero-order term in an expansion in powers of a small parameter that is proportional to (1/xmax) yields an excellent approximation to the solutions of the scaled equation. The boundary-layer characteristics show up in the double limit by the fact that the deviations of η(θ), η′(θ) and the η − η′ phase-space plot from the sharp asymptotic shapes occur over a narrow range in θ of O(1/N) near the turning points of the oscillations.

Original languageEnglish
Pages (from-to)2851-2863
Number of pages13
JournalNonlinear Dynamics
Issue number4
StatePublished - 1 Sep 2022


  • Boundary-layer characteristics
  • Large nonlinearity
  • Nonlinear oscillators
  • Nonlinearly violent oscillations

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics
  • Electrical and Electronic Engineering


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