Characterization and modelling of the dynamic stiffness of nylon mooring rope for floating wind turbines

Nylon is a very promising candidate to replace steel chain moorings for Marine Renewable Energies applications like Wave Energy Converters or Floating Wind Turbine in shallow-water. However, test data for nylon ropes in a wet environment at intermediate scales are lacking in the literature except in...

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Bibliographic Details
Published in:Ocean engineering 2023-11, Vol.287 (part 2), p.115866, Article 115866
Main Authors: Thuilliez, H., Davies, P., Cartraud, P., Feuvrie, M., Soulard, T.
Format: Article
Language:English
Subjects:
Dynamic stiffness
Experimental study
Floating wind turbine
Mooring line
Nylon rope
Sciences of the Universe
Stiffness model
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Summary:Nylon is a very promising candidate to replace steel chain moorings for Marine Renewable Energies applications like Wave Energy Converters or Floating Wind Turbine in shallow-water. However, test data for nylon ropes in a wet environment at intermediate scales are lacking in the literature except in a recent study by Sørum et al 2022. This article proposes a new set of experimental data on nylon subropes with a detailed test procedure. This work focuses on the dynamic stiffness of nylon mooring line and its experimental evaluation at realistic orders of mean load, load variation and frequency. We also examine the accumulated strain after successive test procedures. The experimental campaign highlights the stiffness non-linearity with respect to both the mean tension and amplitude. A simple bi-linear model taken from the work of Huntley2016; Pham 2019 is considered here, and is shown to provide a good simulation of the experimental results. •An experimental campaign is performed to provide data on dynamic stiffness of nylon mooring rope for floating wind turbine.•These data are lacking in the literature for realistic orders of mean tension, tension variation and frequency.•Experimental data highlight the stiffness non-linearity with respect to both the mean tension and amplitude.•A bi-linear model taken from the work of Huntley, 2016; Pham et al., 2019 is found to predict dynamic stiffness well.
ISSN:0029-8018
1873-5258
DOI:10.1016/j.oceaneng.2023.115866