Common industrial practice for designing floating wind turbines is to set an operational limit for the tower-top axial acceleration, normally in the range of 0.2–0.3 g, which is typically understood to be related to the safety of turbine components. This paper investigates the rationality of the tower-top acceleration limit by evaluating the correlation between acceleration and drivetrain responses. A 5-MW reference drivetrain is selected and modeled on a spar-type floating wind turbine in 320 m water depth. A range of environmental conditions are selected based on the long-term distribution of wind speed, significant wave height, and peak period from hindcast data for the Northern North Sea. For each condition, global analysis using an aero-hydro-servo-elastic tool is carried out for six one-hour realizations. The global analysis results provide useful information on their own—regarding the correlation between environmental condition and tower top acceleration, and the correlation between tower top acceleration and other responses of interest—which are used as input in a decoupled analysis approach. The load effects and motions from the global analysis are applied on a detailed drivetrain model in a multibody system (MBS) analysis tool. The local responses on bearings are then obtained from MBS analysis and postprocessed for the correlation study. Although the maximum acceleration provides a good indication of the wave-induced loads, it is not seen to be a good predictor for significant fatigue damage on the main bearings in this case.
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June 2019
Research-Article
Effect of Axial Acceleration on Drivetrain Responses in a Spar-Type Floating Wind Turbine
Amir R. Nejad,
Amir R. Nejad
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Amir.Nejad@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Amir.Nejad@ntnu.no
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Erin E. Bachynski,
Erin E. Bachynski
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: erin.bachynski@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: erin.bachynski@ntnu.no
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Torgeir Moan
Torgeir Moan
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Torgeir.Moan@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Torgeir.Moan@ntnu.no
Search for other works by this author on:
Amir R. Nejad
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Amir.Nejad@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Amir.Nejad@ntnu.no
Erin E. Bachynski
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: erin.bachynski@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: erin.bachynski@ntnu.no
Torgeir Moan
Department of Marine Technology,
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Torgeir.Moan@ntnu.no
Norwegian University of Science
and Technology (NTNU),
Trondheim NO-7491, Norway
e-mail: Torgeir.Moan@ntnu.no
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 2, 2017; final manuscript received August 8, 2018; published online January 17, 2019. Assoc. Editor: Sungmoon Jung.
J. Offshore Mech. Arct. Eng. Jun 2019, 141(3): 031901 (7 pages)
Published Online: January 17, 2019
Article history
Received:
December 2, 2017
Revised:
August 8, 2018
Citation
Nejad, A. R., Bachynski, E. E., and Moan, T. (January 17, 2019). "Effect of Axial Acceleration on Drivetrain Responses in a Spar-Type Floating Wind Turbine." ASME. J. Offshore Mech. Arct. Eng. June 2019; 141(3): 031901. https://doi.org/10.1115/1.4041996
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