Normal modes and boundary layers for a slender tensioned beam on a nonlinear foundation

F. Pellicano, Alexander F Vakakis

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, the nonlinear normal modes (NNMs) of a thin beam resting on a nonlinear spring bed subjected to an axial tension is studied. An energy-based method is used to obtain NNMs. In conjunction with a matched asymptotic expansion, we analyze, through simple formulas, the local effects that a small bending stiffness has on the dynamics, along with the secular effects caused by a symmetric nonlinearity. Nonlinear mode shapes are computed and compared with those of the unperturbed linear system. A double asymptotic expansion is employed to compute the boundary layers in the nonlinear mode shape due to the small bending stiffness. Satisfactory agreement between the theoretical and numerical backbone curves of the system in the frequency domain is observed.

Original languageEnglish (US)
Pages (from-to)79-93
Number of pages15
JournalNonlinear Dynamics
Volume25
Issue number1-3
DOIs
StatePublished - Jul 1 2001

Keywords

  • Boundary layers
  • Nonlinear dynamics
  • Nonlinear normal modes
  • Perturbation methods

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Computational Mechanics

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