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Operational modal analysis in the presence of harmonic excitations: a review
Motte, K.; Weijtjens, W.; Devriendt, C.; Guillaume, P. (2015). Operational modal analysis in the presence of harmonic excitations: a review, in: Caicedo, J. et al. Dynamics of Civil Structures, Volume 2. Proceedings of the 33rd IMAC, a conference and exposition on structural dynamics, 2015. pp. 379-395. https://dx.doi.org/10.1007/978-3-319-15248-6_40
In: Caicedo, J.; Pakzad, S. (Ed.) (2015). Dynamics of Civil Structures, Volume 2. Proceedings of the 33rd IMAC, a conference and exposition on structural dynamics, 2015. Springer International Publishing: [s.l.]. ISBN 978-3-319-15247-9. IX, 557 pp. http://dx.doi.org/10.1007/978-3-319-15248-6, meer

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Author keywords
    Operational Modal Analysis; Parameter estimation; Output-only;Harmonics; Wind turbine

Auteurs  Top 
  • Motte, K.
  • Weijtjens, W., meer
  • Devriendt, C., meer
  • Guillaume, P., meer

Abstract
    Over the past years the use of Operational Modal Analysis (OMA) for Structural health monitoring has become more and more widespread. Such a methodology would also be relevant to wind farm owners that want to monitor the integrity of their turbines' foundations. However, harmonic components, originating from the rotor and periodic aerodynamic forces, are present within the measured vibrations. The harmonics violate the set of assumptions of common OMA techniques and as a result, these techniques potentially fail. This paper explores the different techniques presented in the literature to handle these harmonics. The techniques are first presented and later applied on data of an offshore wind turbine in the Belgian North Sea.

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