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A Periodogram-Based Method for Removing Harmonics in Operational Modal Analysis
University of Southern Denmark, Denmark. (Technology and Innovation)ORCID iD: 0000-0003-2025-7842
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Maskinteknik)ORCID iD: 0000-0002-4404-5708
2012 (English)In: International Conference on Noise and Vibration Engineering 2012 (ISMA 2012): Proceedings of a meeting held 17-19 September 2012, Leuven, Belgium. Including USD 2012 / [ed] P. Sas, S. Jonckheere & D. Moens, Leuven: Katholieke Universiteit Leuven, Department of Mechanical Engineering , 2012, 2625-2634 p.Conference paper, Published paper (Refereed)
Abstract [en]

In many cases where operational modal analysis is of interest, harmonic components are disturbing the estimation of modal parameters. Sometimes the harmonics can be included in the parameter estimation process and subsequently removed (because the damping values become unrealistically low). However, this is difficult if a natural frequency is very close to, or coincides with, a harmonic. In this paper we investigate a recently proposed method for removing harmonics when estimating spectral densities for operational modal analysis. The method is essentially based on removing the harmonics in a periodogram, prior to estimating the spectral density by smoothing the same periodogram. This makes it a very time efficient method, as the harmonic removal is integrated into the spectral analysis process. To produce data for testing the method, a finite element dynamic model representing a wind turbine was created. The MATLAB-based finite element code CALFEM was used to achieve a flexible description of the tower. An aerodynamic force representation excited the rotating structure. An unbalance in one of the blades was introduced to produce a harmonic at the rotation speed of the turbine. To validate the efficiency of the harmonic removal, modal parameters were estimated using simulated data prior to, and after, removing the harmonics. The results show that the harmonic removal with the proposed method is efficient.

Place, publisher, year, edition, pages
Leuven: Katholieke Universiteit Leuven, Department of Mechanical Engineering , 2012. 2625-2634 p.
Keyword [en]
Operational Modal Analysis
National Category
Applied Mechanics
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-21193ISI: 000321063902055ISBN: 9781622768257 (print)OAI: oai:DiVA.org:lnu-21193DiVA: diva2:544457
Conference
International Conference on Noise and Vibration Engineering 2012 (ISMA 2012), Leuven, Belgium, September 17-19, 2012
Available from: 2012-08-14 Created: 2012-08-14 Last updated: 2016-10-03Bibliographically approved

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Brandt, AndersLinderholt, Andreas

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  • apa
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