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Estimating Low-Bias Frequency Response Using Random Decrement
Aarhus School of Engineering, Denmark.
University of Southern Denmark, Denmark.ORCID iD: 0000-0003-2025-7842
2011 (English)In: Modal Analysis Topics, Volume 3: Proceedings of the 29th IMAC, A Conference on Structural Dynamics, 2011, Springer, 2011, Vol. 3, p. 497-502Conference paper, Published paper (Refereed)
Abstract [en]

It is well known that in order to minimize the influence of leakage bias in frequency response function (FRF) estimates, smooth windows should be applied in the FFT processing. It is also normal practice to use self windowing excitation signals whenever possible. However, in many cases FRFs have to be estimated on systems where the excitation signal cannot be altered. Since random data can be compressed in a random decrement function, and since this procedure introduces a natural window, using this technique significantly reduces the influence of leakage bias, and thus, can be used as an alternative to Welch based estimates in cases where the signals involved are random. This means that almost bias-free FRF estimates can be obtained from stationary random excitation. In the paper it is shown how the random decrement technique can be applied to process the time series, and the level of bias on the FRF is estimated and compared to normal Welch based FRF estimates.

Place, publisher, year, edition, pages
Springer, 2011. Vol. 3, p. 497-502
Series
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN 2191-5644
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-56942DOI: 10.1007/978-1-4419-9299-4_41ISBN: 9781441992987 (print)ISBN: 9781441992994 (print)OAI: oai:DiVA.org:lnu-56942DiVA, id: diva2:1040077
Conference
29th International Modal Analysis Conference (IMAC), Jacksonville, USA, January 31-February 3, 2011
Available from: 2016-10-26 Created: 2016-09-28 Last updated: 2016-10-26Bibliographically approved

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Brandt, Anders

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  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
  • html
  • text
  • asciidoc
  • rtf