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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2016-37
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research articles
09 Dec 2016
Review status
A revision of this discussion paper was accepted for the journal Wind Energy Science (WES) and is expected to appear here in due course.
Effect of the Foundation Modelling on the Fatigue Lifetime of a Monopile-based Offshore Wind Turbine
Steffen Aasen1, Ana Page2,3, Kristoffer Skjolden Skau2,3, and Tor Anders Nygaard1 1Institute for Energy Technology, PO Box 40, 2027 Kjeller, Norway
2Norwegian Geotechnical Institute, Sognsveien 72, 0855 Oslo, Norway
3Norwegian University of Science and Technology, Department of Civil and Transport Engineering, Høgskoleringen 7A, 7491 Trondheim, Norway
Abstract. Several studies have emphasized the importance of modelling foundation response with representative damping and stiffness characteristics in integrated analyses of offshore wind turbines (OWT's). For the monopile foundation, the industry standard for pile-analysis has shown to be inaccurate, and alternative models that simulate foundation behavior more accurately are needed. As fatigue damage is a critical factor in the design phase, this study investigates how four different soil-foundation models affect the fatigue damage of an OWT with monopile foundation. The study shows how both stiffness and damping properties have a noticeable effect on the fatigue damage, especially for idling cases. At mudline, accumulated fatigue damage varied up to 16 % depending on the foundation model used.

Citation: Aasen, S., Page, A., Skjolden Skau, K., and Nygaard, T. A.: Effect of the Foundation Modelling on the Fatigue Lifetime of a Monopile-based Offshore Wind Turbine, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2016-37, in review, 2016.
Steffen Aasen et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'Comments', Anonymous Referee #1, 09 Jan 2017 Printer-friendly Version 
AC1: 'response to referee 1', Tor Anders Nygaard, 21 Feb 2017 Printer-friendly Version Supplement 
 
RC2: 'Review', Michael Muskulus, 24 Jan 2017 Printer-friendly Version 
AC2: 'response to referee 2', Tor Anders Nygaard, 21 Feb 2017 Printer-friendly Version Supplement 
Steffen Aasen et al.
Steffen Aasen et al.

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Short summary
The industry standard for analysis of monopile foundations is inaccurate, and alternative models for foundation behavior are needed. This study investigates how four different soil-foundation models affect the fatigue damage of an offshore wind turbine with monopile foundation. Stiffness and damping properties have a noticeable effect, in particular for idling cases. At mudline, accumulated fatigue damage varied up to 16% depending on the foundation model used.
The industry standard for analysis of monopile foundations is inaccurate, and alternative models...
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