Analytical modelling and extraction of the modal behaviour of a cantilever beam in fluid interaction

D.G. Gorman, I. Trendafilova, A.J. Mulholland, J. Horáček

Research output: Contribution to journalArticle

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Abstract

When carrying out vibration health monitoring (VHM) of a structure it is usually assumed that the structure is in the absence of fluid interaction and/or that any environmental effects which can cause changes in the vibration response of the structure either remain constant or are negligible. In general, the natural frequencies of a structure are the first candidates to be considered for damage features. But the natural frequencies would also change as a result of the interaction of the structure with a fluid/gas environment. For the purpose of VHM, one needs the pure structural natural frequencies corresponding to conditions when the structure does not interact with the environment. Therefore, in certain cases when the above assumptions cannot be made it becomes necessary to extract values of natural frequencies of the structure if it were in the absence of fluid interaction from those values measured. This paper considers the case of a cantilever beam in contact with a fluid cavity giving rise to strong structural/fluid vibration interaction and develops a method by which the natural frequencies of the beam in the absence of fluid interaction can be obtained from those of the beam in interaction.
Original languageEnglish
Pages (from-to)231-245
Number of pages14
JournalJournal of Sound and Vibration
Volume308
Issue number1-2
DOIs
Publication statusPublished - 20 Nov 2007

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cantilever beams
Cantilever beams
resonant frequencies
Natural frequencies
Fluids
fluids
vibration
interactions
health
Health
Monitoring
Contacts (fluid mechanics)
Environmental impact
damage
cavities
causes
Gases
gases

Keywords

  • fluid dynamics
  • vibration analysis
  • vibration health monitoring

Cite this

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abstract = "When carrying out vibration health monitoring (VHM) of a structure it is usually assumed that the structure is in the absence of fluid interaction and/or that any environmental effects which can cause changes in the vibration response of the structure either remain constant or are negligible. In general, the natural frequencies of a structure are the first candidates to be considered for damage features. But the natural frequencies would also change as a result of the interaction of the structure with a fluid/gas environment. For the purpose of VHM, one needs the pure structural natural frequencies corresponding to conditions when the structure does not interact with the environment. Therefore, in certain cases when the above assumptions cannot be made it becomes necessary to extract values of natural frequencies of the structure if it were in the absence of fluid interaction from those values measured. This paper considers the case of a cantilever beam in contact with a fluid cavity giving rise to strong structural/fluid vibration interaction and develops a method by which the natural frequencies of the beam in the absence of fluid interaction can be obtained from those of the beam in interaction.",
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Analytical modelling and extraction of the modal behaviour of a cantilever beam in fluid interaction. / Gorman, D.G.; Trendafilova, I.; Mulholland, A.J.; Horáček, J.

In: Journal of Sound and Vibration, Vol. 308, No. 1-2, 20.11.2007, p. 231-245.

Research output: Contribution to journalArticle

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