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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [247371]

Monitoring changes in the soil and foundation characteristics of an offshore wind turbine using automated operational modal analysis De Sitter, G.; Weijtjens, W.; El Kafafy, M.; Devriendt, C. (2013). Monitoring changes in the soil and foundation characteristics of an offshore wind turbine using automated operational modal analysis, in: Basu, B. (Ed.) Damage Assessment of Structures X. 10th International Conference on Damage Assessment of Structures (DAMAS), July 08-10, 2013, Dublin. Key Engineering Materials, 569-570: pp. 652-659. https://dx.doi.org/10.4028/www.scientific.net/KEM.569-570.652 In: Basu, B. (Ed.) (2013). Damage Assessment of Structures X. 10th International Conference on Damage Assessment of Structures (DAMAS), July 08-10, 2013, Dublin. Key Engineering Materials, 569-570. Trans Tech Publications: Zurich. http://dx.doi.org/10.4028/www.scientific.net/KEM.569-570, meer In: Key Engineering Materials. Trans Tech Publications: Ädermannsdorf. ISSN 0252-1059; e-ISSN 1013-9826, meer

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Beschikbaar in	Auteurs
VLIZ: Non-open access 318296 [ aanvragen ]
Documenttype: Congresbijdrage

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Trefwoorden

ANE, België, Belgisch Continentaal Plat (BCP) [Marine Regions] Marien/Kust

Author keywords

monitoring; offshore wind turbine; operational modal analysis; signal processing

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Auteurs		Top
De Sitter, G., meer Weijtjens, W., meer El Kafafy, M., meer Devriendt, C., meer

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Abstract

This paper shows the first results of a long term monitoring campaign on an offshore wind turbine in the Belgian North Sea. It focuses on the vibration levels and resonant frequencies of the fundamental modes of the support structure. These parameters are crucial to minimize the O&M costs and to extend the lifetime of offshore wind turbine structures.For monopile foundations, scouring and reduction in foundation integrity over time are especially problematic because they reduce the fundamental structural resonance of the support structure, aligning that resonance frequency more closely to the lower frequencies. Since both the broadband wave energy and the rotating frequency of the turbine are contained in this low frequency band, the lower natural frequency can create resonant behavior increasing fatigue damage. Continuous monitoring of the effect of scour on the dynamics of the wind turbine will help to optimize the maintenance activities on the scour protection system.To allow proper continuous monitoring during operation, reliable state-of-the-art operational modal analysis techniques should be used. Those techniques are presented in this paper. The methods are also automated, so that the system can track the natural frequencies and damping ratios in a reliable manner.

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