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A Comparison of Non-Parametric Techniques for FRF Estimation Using Pure Random Excitation
University of Southern Denmark, Denmark.ORCID iD: 0000-0003-2025-7842
University of Southern Denmark, Denmark.
2012 (English)In: Topics in Modal Analysis I, Volume 5: Proceedings of the 30th IMAC, A Conference on Structural Dynamics, 2012 / [ed] R. Allemang, J. De Clerck, C. Niezrecki & J.R. Blough, Springer, 2012, 523-534 p.Conference paper, Published paper (Refereed)
Abstract [en]

It is often remarked that pure random noise cannot, or should not, be used for estimating frequency response on lightly damped structures. The reason given is that the bias errors caused by leakage would “deform” the estimated FRF in an unsuitable way for modal parameter processing. In this paper, traditional coherence-based methods are compared with the recently proposed local polynomium method. It is demonstrated that the bias error can be made arbitrarily small but that it requires rather long FFT blocksize, relative to what is needed with other excitation signals, such as burst random or periodic excitation signals. A main conclusion is that, while pure random is an inferior excitation signal for synthetic excitation, in cases where there is no choice, such as wind or traffic loaded structures, low-bias FRFs can very well be estimated, provided the measurement time can be long enough.

Place, publisher, year, edition, pages
Springer, 2012. 523-534 p.
Series
Conference Proceedings of the Society for Experimental Mechanics Series, ISSN 2191-5644
Keyword [en]
Frequency response function, Local polynomium method, Modal analysis
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-56941DOI: 10.1007/978-1-4614-2425-3_49ISBN: 9781461424246 (print)ISBN: 9781461424253 (print)OAI: oai:DiVA.org:lnu-56941DiVA: diva2:1039895
Conference
30th International Modal Analysis Conference (IMAC), Jacksonville, USA, January 30-February 2, 2012
Available from: 2016-10-25 Created: 2016-09-28 Last updated: 2016-10-25Bibliographically approved

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Brandt, Anders
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CiteExportLink to record
Permanent link

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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
  • rtf