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An investigation of the effects of wind-induced inclination on floating wind turbine dynamics: heave plate excursion


Citation Antonutti, R., Peyrard, C., Johanning, L., Incecik, A., Ingram, D.M. An investigation of the effects of wind-induced inclination on floating wind turbine dynamics: heave plate excursion, Ocean Engineering, 91: 208-217, 2017. https://doi.org/10.1016/j.oceaneng.2014.09.008.
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Author(s) Antonutti, R., Peyrard, C., Johanning, L., Incecik, A., Ingram, D.M.
Project partner(s) Electricité de France, The University of Edinburgh, Saint-Venant Hydraulics Laboratory, University of Exeter, University of Strathclyde
Publisher Ocean Engineering, 91: 208-217
DOI https://doi.org/10.1016/j.oceaneng.2014.09.008
Abstract A current trend in offshore wind is the quest for exploitation of ever deeper water sites. At depths between 50 m and 100 m a promising substructure is the column-stabilised semi-submersible floating type. This solution is currently being tested at full scale at the WindFloat and Fukushima Forward demonstrator sites in Portugal and Japan respectively. The semi-sub design class frequently adopts passive motion control devices based on the water entrapment principle, such as heave plates, tanks, and skirts. Whilst effective for small inclinations, these can underperform when the structure is inclined under wind loading. This study examines the alteration of potential hydrodynamics due to wind-induced trim (geometric non-linearity) and its impact on the wind turbine’s wave response with focus on heave plate performance. Firstly it is shown by using the boundary element approach thatwind trim affects wave loading in the ocean wave band between 5 s and 15 s, and introduces hydrodynamic coupling typical of non-symmetric hulls. These features are incorporated in frequency-domain dynamic response analysis to demonstrate that said effects bear a significant impact on the turbine’s motion in waves. Accounting of heave plate excursion improves the assessment of the seaworthiness of floating wind turbine concepts, potentially leading to new design constraints.

Highlights
  • Wave loads on semi-sub FWT platforms are sensitive to wind-driven inclination.
  • The effects of geometric non-linearity can be pronounced in presence of heave plates.
  • The wave load alteration due to heave plate vertical excursion is investigated.
  • Significant heave plate excursion occurs when a FWT’s mean inclination reaches 5°
  • The motion of a FWTis affected heave plate excursion in the 5 s to 15 s period range


This work was partly funded via IDCORE, the Industrial Doctorate Centre for Offshore Renewable Energy, which trains research engineers whose work in conjunction with sponsoring companies aims to accelerate the deployment of offshore wind, wave and tidal-current technologies
Associated Project(s) ETI-MA2003: Industrial Doctorate Centre for Offshore Renewable Energy (IDCORE)
Associated Dataset(s) EDC0000134: Tidal Energy Site Environmental Conditions Measured During the ReDAPT Tidal Project 2011-2014
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