In off-shore wind turbine, it is difficult to determine the risk of accident caused by the mooring destruction through experiment. In this paper, the authors discuss the risk, with the case of a drifting ship wanders into the wind farm. In the design of a floating offshore wind turbine (FOWT), drift of a FOWT is considered as a serious failure mode and the mooring system must be designed to avoid the failure. The failure of mooring line is not initiated just by extreme environmental load but can be initiated by collision with a drifting ship, which enters the wind farm. This phenomenon is difficult to investigate by a tank experiment. So far, little knowledge exists about the phenomenon. In this research, a simulator to reproduce the collision process of a FOWT and a drift ship and a progressive drift of FOWTs in a wind farm was developed. Using this simulator and statistics of drift incidents of a ship, a procedure to evaluate risk of progressive drifts in a wind farm was established. In that case, second accident that a wind turbine which has started drifting caused by the drifting ship collides with one another wind turbine is expected. As a result, the risk mainly depends on the risk of drifting caused by a large displaced ship. In addition, the risk partly depends on the arrangement of wind farm.
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ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
May 31–June 5, 2015
St. John’s, Newfoundland, Canada
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5654-3
PROCEEDINGS PAPER
Estimation of Risk of Progressive Drifts in a Wind Farm Caused by Collision of Drift Ship
Eiji Hirokawa,
Eiji Hirokawa
University of Tokyo, Kashiwa, Japan
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Hideyuki Suzuki,
Hideyuki Suzuki
University of Tokyo, Kashiwa, Japan
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Shinichiro Hirabayashi,
Shinichiro Hirabayashi
University of Tokyo, Kashiwa, Japan
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Minon Muratake
Minon Muratake
Lotte Co., Tokyo, Japan
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Eiji Hirokawa
University of Tokyo, Kashiwa, Japan
Hideyuki Suzuki
University of Tokyo, Kashiwa, Japan
Shinichiro Hirabayashi
University of Tokyo, Kashiwa, Japan
Minon Muratake
Lotte Co., Tokyo, Japan
Paper No:
OMAE2015-41473, V006T05A011; 8 pages
Published Online:
October 21, 2015
Citation
Hirokawa, E, Suzuki, H, Hirabayashi, S, & Muratake, M. "Estimation of Risk of Progressive Drifts in a Wind Farm Caused by Collision of Drift Ship." Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. Volume 6: Ocean Space Utilization. St. John’s, Newfoundland, Canada. May 31–June 5, 2015. V006T05A011. ASME. https://doi.org/10.1115/OMAE2015-41473
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