dc.contributor.author | Katsikogiannis, George | |
dc.contributor.author | Sørum, Stian Høegh | |
dc.contributor.author | Bachynski, Erin Elizabeth | |
dc.contributor.author | Amdahl, Jørgen | |
dc.date.accessioned | 2021-03-16T09:46:08Z | |
dc.date.available | 2021-03-16T09:46:08Z | |
dc.date.created | 2021-03-12T12:25:03Z | |
dc.date.issued | 2021 | |
dc.identifier.citation | Marine Structures. 2021, 77 . | en_US |
dc.identifier.issn | 0951-8339 | |
dc.identifier.uri | https://hdl.handle.net/11250/2733559 | |
dc.description.abstract | Fatigue damage is one of the governing factors for the design of offshore wind turbines. However, the full fatigue assessment is a time-consuming task. During the design process, the site-specific environmental parameters are usually condensed by a lumping process to reduce the computational effort. Preservation of fatigue damage during lumping requires an accurate consideration of the met-ocean climate and the dynamic response of the structure. Two lumping methods (timedomain and frequency-domain) have been evaluated for a monopile-based 10 MW offshore wind turbine, both based on damage-equivalent contour lines. Fatigue damage from lumped load cases was compared to full long-term fatigue assessment. The lumping methods had an accuracy of 94–98% for the total long-term fatigue damage and 90% for individual wind speed classes, for aligned wind and waves. Fatigue damage was preserved with the same accuracy levels for the whole support structure. A significant reduction of computational time (93%) was achieved compared to a full long-term fatigue assessment. For the cases with 30◦ and 60◦ wind-wave misalignment, there was a mean underestimation of approximately 10%. Variations in penetration depth did not affect the selection of the lumped sea-state parameters. This work presents a straightforward method for the selection of damage-equivalent lumped load cases, which can adequately preserve long-term fatigue damage throughout the support structure, providing considerable reduction of computational effort. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Environmental lumping for efficient fatigue assessment of large-diameter monopile wind turbines | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.source.pagenumber | 21 | en_US |
dc.source.volume | 77 | en_US |
dc.source.journal | Marine Structures | en_US |
dc.identifier.doi | https://doi.org/10.1016/j.marstruc.2021.102939 | |
dc.identifier.cristin | 1897638 | |
dc.description.localcode | © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |