Damping of torsional vibrations in thin-walled beams by viscous bimoments

David Hoffmeyer*, Jan Høgsberg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Torsional vibrations in beams are damped by discrete, axial viscous dampers in configurations constituting bimoments. The bimoments act on warping displacements and partial restraining of warping suggests the inclusion of a flexibility parameter, calibrated from numerical results. Correcting for distortion is incorporated in a similar manner. The use of the governing differential equation with calibrated parameters as an alternative to a full complex analysis by a FE model is justified by an example. It is demonstrated that the differential equation determines the damped frequencies and damping ratios with great accuracy. Significant damping ratios of the lowest torsional mode are obtained.

Original languageEnglish
JournalMechanics of Advanced Materials and Structures
ISSN1537-6494
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Bimoment
  • Damping
  • Finite element method
  • Thin-walled beams
  • Torsional vibrations
  • Warping

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