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dc.contributor.authorHorn, Jan-Tore H.
dc.contributor.authorWinterstein, Steven R.
dc.identifier.citationJournal of Physics, Conference Series. 2018, 1104 .nb_NO
dc.description.abstractThe contour-line method is a simplified approach for finding the long-term extreme values by a small number of short-term analyses. It is assumed the response with a return period of T years occurs during a sea-state with a shorter or equal return period. This provides good extreme response estimates for structures with a response behaviour monotonically increasing with the severity of the sea-state. For an offshore wind turbine, the power production stops at a certain wind speed to reduce wear, changing the dynamics of the system dramatically, from wind to wave load dominated. Also, there is a non-negligible probability for the turbine being unable to operate although the wind speeds would suggest so, due to e.g. grid- or mechanical failure. Therefore, the original contour-line method for extreme response estimation is not applicable without some modifications to account for changing dynamics. In the present work, it is suggested to treat the operational and non-operational conditions as two sub-populations and estimate the T-year response in each population by a standard contour-line method. Next, the results from each sub-population are combined in order to estimate the total T-year response in a consistent manner.nb_NO
dc.publisherIOP Publishingnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleExtreme response estimation of offshore wind turbines with an extended contour-line methodnb_NO
dc.title.alternativeExtreme response estimation of offshore wind turbines with an extended contour-line methodnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalJournal of Physics, Conference Seriesnb_NO
dc.relation.projectNorges forskningsråd: 223254nb_NO
dc.description.localcodeContent from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd.nb_NO
cristin.unitnameInstitutt for marin teknikk

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