Transverse vibrations induced by longitudinal excitation in beams with geometrical and loading imperfections

Si Mohamed Sah*, Jon Juel Thomsen, Dmitri Tcherniak

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

With structural health monitoring techniques based on measuring transverse vibrations of beam-like components it can be difficult to provide transverse excitation, while longitudinal excitation can be easier. We experimentally investigate how transverse vibrations in a beam can be excited by a longitudinal hammer impact. We carry out a comparative study on the measured transverse natural frequencies and frequency response coherence for different input and output locations and directions. It is shown that transverse vibrations are excited regardless of the impact locations and directions. Theoretical explanation to this counter-intuitive phenomenon is provided in terms of various imperfections associated with beams and impacts.
Original languageEnglish
JournalJournal of Sound and Vibration
Volume444
Pages (from-to)152-160
ISSN0022-460X
DOIs
Publication statusPublished - 2019

Keywords

  • Beam imperfection
  • Impact imperfection
  • Longitudinal impact
  • Transverse vibrations

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