Methodology for estimating offshore wind turbine fatigue life under combined loads of wind, waves and ice at sub-zero temperatures

Aleksandar-Saša Milaković, Moritz Braun, Tom Willems, Hayo Hendrikse, Claas Fischer, Sören Ehlers

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Due to increasing trend of building offshore wind turbines (OWTs) in seas at high latitudes where seasonal sea ice occurs, novel methods for design of such structures are needed. Specifically, the effect of ice-induced vibrations (IIVs) on fatigue life of the structures is currently poorly understood. Therefore, the goal of this paper is to analyze the current state-of-the-art approach for estimating the ice loads contribution to the fatigue life of OWTs and identify the current knowledge gaps. Moreover, the paper proposes a methodology for developing a combined load spectrum of wind, waves and ice using numerical simulations, with an ultimate goal to develop applicable Gaßner curves characterizing the variable-amplitude nature of the loading pattern. Finally, the use of small-scale fatigue tests under sub-zero temperatures in order to develop the appropriate S-N and Gaßner curves is discussed.
Original languageEnglish
Title of host publicationInternational Conference on Ships and Offshore Structures ICSOS 2019
Number of pages8
Publication statusPublished - 2019
EventICSOS 2019: 4th International Conference on Ships and Offshore Structures
- Cape Carnival, United States
Duration: 4 Nov 20198 Nov 2019
https://www.engmorph.com/Conferences/ICSOS-2019

Conference

ConferenceICSOS 2019: 4th International Conference on Ships and Offshore Structures
Abbreviated titleICSOS 2019
CountryUnited States
CityCape Carnival
Period4/11/198/11/19
Internet address

Bibliographical note

Accepted Author Manuscript

Keywords

  • Fatigue life of OWT
  • Fatigue tests
  • Ice-induced vibrations
  • Low-temperature fatigue
  • Variable-amplitude loading

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