Resonances and vibrations in an elevator cable system due to boundary sway

Nick V. Gaiko, Wim T. van Horssen

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

In this paper, an analytical method is presented to study an initial-boundary value problem describing the transverse displacements of a vertically moving beam under boundary excitation. The length of the beam is linearly varying in time, i.e., the axial, vertical velocity of the beam is assumed to be constant. The bending stiffness of the beam is assumed to be small. This problem may be regarded as a model describing the lateral vibrations of an elevator cable excited at its boundaries by the wind-induced building sway. Slow variation of the cable length leads to a singular perturbation problem which is expressed in slowly changing, time-dependent coefficients in the governing differential equation. By providing an interior layer analysis, infinitely many resonance manifolds are detected. Further, the initial-boundary value problem is studied in detail using a three-timescales perturbation method. The constructed formal approximations of the solutions are in agreement with the numerical results.

Original languageEnglish
Pages (from-to)272-292
Number of pages21
JournalJournal of Sound and Vibration
Volume424
DOIs
Publication statusPublished - 2018

Keywords

  • Averaging
  • Boundary sway
  • Multiple timescales
  • Resonance
  • Singular perturbation
  • Time-varying length

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