Fatigue is the main design driver for offshore wind turbines on monopile foundations. With the first generation of farms reaching their design life structural reserves become apparent. Monitoring of the periodic strains at critical locations enables to assess the remaining useful lifetime. Typically, welded connections beneath the sea bed are determining the lifetime of the entire structure. Since no direct method e.g. visual inspection is feasible to analyze damage progress at these locations estimation methods are applied. Three turbines of the Belgian offshore wind farm Nobel wind were equipped with optical fiber strain gauges over the entire foundation length and with accelerometers on the turbine tower. In this contribution, a modal expansion algorithm is selected to reconstruct subsoil strain from accelerations measured on the tower. Within a short-term analysis strain estimations are validated against measurement data on submerged sensors and fatigue assessment is done on the validated data. © 2019 International Group of Operational Modal Analysis
Original languageEnglish
Title of host publication8th IOMAC - International Operational Modal Analysis Conference, Proceedings 2019
Pages765-774
Number of pages10
Publication statusPublished - 15 May 2019
EventIOMAC 2019 INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE - Copenhagen, Denmark
Duration: 13 May 201915 Aug 2019

Conference

ConferenceIOMAC 2019 INTERNATIONAL OPERATIONAL MODAL ANALYSIS CONFERENCE
Abbreviated titleIOMAC
CountryDenmark
Period13/05/1915/08/19

ID: 47859240