Articles | Volume 11, issue 5
https://doi.org/10.5194/wes-11-1569-2026
https://doi.org/10.5194/wes-11-1569-2026
Research article
 | 
04 May 2026
Research article |  | 04 May 2026

Impact of floater flexibility on tower eigenfrequencies of a spar-type floating offshore wind turbine: measurement-based assessment and model calibration

Cesar Aguilera, Romain Ribault, Jerome De-Lauzon, and Adrien Hirvoas

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Cited articles

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Borg, M., Hansen A., and Bredmose, H.: Floating substructure flexibility of large-volume 10MW offshore wind turbine platforms in dynamic calculations, J. Phys., 753, https://doi.org/10.1088/1742-6596/753/8/082024, 2016. a, b
Bureau Veritas: Classification and certification of floating offshore wind turbines (NI 572 DT R01 E), https://questfwe.com/wp-content/uploads/2018/06/Veristar.-Classification-of-offshore-floating-turbines.pdf (last access: 17 April 2026), 2015. a
Cheng, Z., Wang, K., Gao, Z., and Moan, T.: Comparative study of spar type floating horizontal and vertical axis wind turbines subjected to constant winds, Proceedings of EWEA Offshore, https://www.researchgate.net/publication/281459433_Comparative_study_of_spar_type_floating_horizontal_and_vertical_axis_wind_turbines_subjected_to_constant_winds (last access: 17 April 2026), 2015. a
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Our analysis has revealed that the natural frequencies of the tower vary depending on the operational state of the turbine and are significantly influenced by the flexibility of the support structure. For a spar-type floater, a mismatch of 40 % was found. This work highlights the importance of continuous structural monitoring of offshore assets, the need to raise awareness within the design community and the current lack of explicit guidance on this issue in recommended industry practices.
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