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Foundation structural health monitoring of an offshore wind turbinea full-scale case study
Weijtjens, W.; Verbelen, T.; De Sitter, G.; Devriendt, C. (2016). Foundation structural health monitoring of an offshore wind turbinea full-scale case study. Structural Health Monitoring 15(4): 389-402. https://dx.doi.org/10.1177/1475921715586624
In: Structural Health Monitoring. Sage: London. ISSN 1475-9217; e-ISSN 1741-3168
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Author keywords
    Foundation monitoring; offshore wind turbine; operational modalanalysis; data normalization; operational and environmental variability
Authors  Top 
  • Weijtjens, W.
  • Verbelen, T.
  • De Sitter, G.
  • Devriendt, C.
Abstract
    In this contribution, first, the results in the development of a structural health monitoring approach for the foundations of an offshore wind turbine based on its resonance frequencies will be presented. Key problems are the operational and environmental variability of the resonance frequencies of the turbine that potentially conceal any structural change. This article uses a (non-)linear regression model to compensate for the environmental variations. An operational case-by-case monitoring strategy is suggested to cope with the dynamic variability between different operational cases of the turbine. Real-life data obtained from an offshore turbine on a monopile foundation are used to validate the presented strategy and to demonstrate the performance of the presented approach. First, the results indicate an overall stiffening of the investigated structure.
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