Effects of a non-linear energy sink (NES) on vortex-induced vibrations of a circular cylinder

A. Mehmood, Ali H. Nayfeh, Muhammed R. Hajj

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

We investigate in detail the passive control of vortex-induced vibrations of a freely oscillating circular cylinder using a non-linear energy sink consisting of a secondary system having linear damping and an essential non-linear cubic stiffness. The loads on the cylinder are calculated using a direct numerical simulation of the incompressible flow over the cylinder using a parallel computational fluid dynamics code. A strongly coupled fluid structure control numerical model is used to determine the responses of the cylinder and the sink as well as the flow. We vary the sink parameters (mass and damping) and determine their effects on the response of the coupled system. We find multiple stable responses of the coupled system for different mass ratios and damping coefficient of the sink, depending on the initial conditions.

Original languageEnglish
Pages (from-to)667-680
Number of pages14
JournalNonlinear Dynamics
Volume77
Issue number3
DOIs
StatePublished - Aug 2014

Keywords

  • CFD
  • Non-linear energy sink
  • Vortex-induced vibrations

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