Evaluating different automated operational modal analysis techniques for the continuous monitoring of offshore wind turbines

Mahmoud Elkafafy, Christof Devriendt, Wout Weijtjens, Gert De Sitter, Patrick Guillaume

Research output: Chapter in Book/Report/Conference proceedingConference paperResearch

5 Citations (Scopus)

Abstract

This paper will evaluate different automated operational modal analysis techniques for the continuous monitoring of offshore wind turbines. The experimental data has been obtained during a long-term monitoring campaign on an offshore wind turbine in the Belgian North Sea. State-of-the art operational modal analysis techniques and the use of appropriate vibration measurement equipment can provide accurate estimates of natural frequencies, damping ratios and mode shapes of offshore wind turbines. To allow a proper continuous monitoring the methods have been automated and their reliability improved. The advanced modal analysis tools, which will be used, include the poly-reference Least Squares Complex Frequency-domain estimator (pLSCF), commercially known as PolyMAX, the polyreference maximum likelihood estimator (pMLE), and the frequency-domain subspace identification (FSSI) technique. The robustness of these estimators with respect to a possible change in the implementation options that could be defined by the user (e.g. type of polynomial coefficients used, parameter constraint used....) will be investigated. In order to improve the automation of the techniques, an alternative representation for the stabilization charts as well as robust cluster algorithms will be presented.
Original languageEnglish
Title of host publicationInternational Modal Analysis Conference IMAC XXXII - Orlando - Florida - USA,
Subtitle of host publicationDynamics of Civil Structures
EditorsF.N. Catbas
PublisherSpringer International Publishing
Pages313-329
Number of pages16
Volume4
ISBN (Electronic)978-3-319-04546-7
ISBN (Print)978-3-319-04545-0
DOIs
Publication statusPublished - 1 Feb 2014
Event32nd International Conference on Modal Analysis, IMAC-XXXII - Orlando, FL, United States
Duration: 2 Feb 20145 Feb 2014

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
PublisherSpringer
ISSN (Print)2191-5644

Conference

Conference32nd International Conference on Modal Analysis, IMAC-XXXII
CountryUnited States
CityOrlando, FL
Period2/02/145/02/14

Keywords

  • Monitoring
  • Offshore Wind Turbine
  • Operational Modal Analysis

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