Frequency-domain framework for floating installation of wind-turbine towers

David Fidalgo Domingos*, Peter Wellens, Jan Willem van Wingerden

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

As a result of more stable wind conditions and the depletion of near-shore locations, wind farms are moving farther offshore into deeper waters, challenging the current limits of offshore heavy-lift operations. This paper presents and verifies a novel frequency-domain framework to perform extensive site-specific analysis, of floating installations of wind-turbine towers, subjected to wind and wave loads. The versatility and potential of this framework is demonstrated with a case-study of a wind farm near the coast of Portugal. The results lead to the following conclusions: (1) Only considering beam-seas the yearly workability is 39 %; (2) Workability is mostly limited by wave loads; (3) Tower motions tend to decrease with tower size and are not significantly affected by hook-tower distance (sling length); and finally, (4) In this case-study the most contributing frequencies for tower motions are 0.3 and 0.4 rad/s, corresponding mainly to the first pendulation mode.

Original languageEnglish
Article number116952
Number of pages11
JournalOcean Engineering
Volume297
DOIs
Publication statusPublished - 2024

Funding

This work is part of the “DOT 6000 - Floating Offshore installation XXL wind turbines”, where Delft Offshore Turbine B.V., Heerema Marine Contractors Nederland SE and Techische Universiteit Delft have teamed up. Funding was provided by RVO , with the grant number TEHE119004 . We further would like to acknowledge Rolf van Huffelen and Alejandro Velez Isaza, for supporting this research with their technical expertise in the field of offshore heavy-lift operations.

Keywords

  • Dynamic error budgeting
  • Heavy lift
  • Offshore wind
  • Sensitivity analysis
  • Stochastic disturbances
  • Workability analysis

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