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Damping Estimation from Operational and Experimental Modal Analysis on a Laboratory Test Plate
University of Southern Denmark, Denmark.
University of Southern Denmark, Denmark.ORCID iD: 0000-0003-2025-7842
2015 (English)In: 6th International Operational Modal Analysis Conference (IOMAC 2015), Gijón, Spain, 12-14 May 2015, International Operational Modal Analysis Conference (IOMAC) , 2015, 305-318 p., 33Conference paper, Published paper (Refereed)
Abstract [en]

Operational modal analysis (OMA) is widely used whenever the dynamic characteristics of structuresthat do not fit into a laboratory are needed. In addition, OMA offers a test of the structure under itsreal boundary conditions which can be preferable for validation of numerical models. Theoretically, atleast, the natural frequencies and damping ratios should be identically estimated by an OMA test andan experimental modal analysis (EMA) test. However it is still commonly believed that an EMA testis more reliable because of the available information and controlled environment. The present paperpresents an experimental study of EMA and OMA tests of a Plexiglas plate under free-free conditions.The plate which is a simple geometry is designed to have closely spaced modes and is seen as a goodstructure for comparison. Modal parameters are compared between the EMA and OMA test and it isfound that natural frequencies and mode shapes are similar within 0.2 % (MAC), whereas the dampingratios showed differences up to 7.7 % and are consistently lower for the OMA test. This differences indamping were possibly caused by slightly nonlinear boundary conditions combined with the fact that thevibration levels for the EMA test were higher than for the OMA test.

Place, publisher, year, edition, pages
International Operational Modal Analysis Conference (IOMAC) , 2015. 305-318 p., 33
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-56961ISBN: 9781510803671 (print)OAI: oai:DiVA.org:lnu-56961DiVA: diva2:1033464
Conference
6th International Operational Modal Analysis Conference (IOMAC), Gijón, Spain, May 12-14, 2015
Available from: 2016-10-06 Created: 2016-09-28 Last updated: 2016-10-25Bibliographically approved

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Brandt, Anders
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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