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Keywords = maximum breaking load (MBL)

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23 pages, 8730 KiB  
Article
Dynamic Response of an Offshore Floating Wind Turbine at Accidental Limit States—Mooring Failure Event
by Ray-Yeng Yang, Tzu-Ching Chuang, Chenyu Zhao and Lars Johanning
Appl. Sci. 2022, 12(3), 1525; https://doi.org/10.3390/app12031525 - 31 Jan 2022
Cited by 27 | Viewed by 4709
Abstract
This paper investigates the dynamic response of a fully nonlinear model of a DeepCWind floating offshore wind turbine (FOWT) after one of its three-catenary mooring systems is broken. The drift area of the platform, pitch motion of the wind turbine, and tension on [...] Read more.
This paper investigates the dynamic response of a fully nonlinear model of a DeepCWind floating offshore wind turbine (FOWT) after one of its three-catenary mooring systems is broken. The drift area of the platform, pitch motion of the wind turbine, and tension on the two ends of the mooring line are the main dynamic response foci; in addition, a single mathematical formula is provided in this study to predict the maximum drift in surge direction. After the platform reaches the new equilibrium position maintained by the remaining two mooring lines, the tower pitch exceeds 20 degrees. The tension change is closely related to the drift motion, necessitating an increase in the minimum breaking load (MBL) of the mooring line components. The mathematical forecast of the maximum surge shows good agreement with the numerical results, even with different water depths Full article
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17 pages, 7831 KiB  
Article
A Study on the Effectiveness of the Heading Control on the Mooring Line Tension and Position Offset for an Arctic Floating Structure under Complex Environmental Loads
by Hyun Hwa Kang, Dae-Soo Lee, Ji-Su Lim, Seung Jae Lee, Jinho Jang, Kwang Hyo Jung and Jaeyong Lee
J. Mar. Sci. Eng. 2021, 9(2), 102; https://doi.org/10.3390/jmse9020102 - 20 Jan 2021
Cited by 5 | Viewed by 2756
Abstract
Even though interest in developing the Arctic region is increasing continuously, the standard procedure to be used to analyze the station-keeping performance of a floater considering ice loads has not been established yet. In this paper, the effectiveness of heading control with a [...] Read more.
Even though interest in developing the Arctic region is increasing continuously, the standard procedure to be used to analyze the station-keeping performance of a floater considering ice loads has not been established yet. In this paper, the effectiveness of heading control with a dynamic positioning system is analyzed to evaluate the improvement of the performance of the station-keeping system in the ice conditions. Complex environmental loads with ice-induced forces were generated and applied to a ship type floater with dynamic positioning and mooring systems. Three-hour time-domain simulations were conducted for the two different station-keeping systems with mooring only and mooring with a dynamic positioning system. Position offsets and mooring line tensions for the two scenarios were compared with maximum values and most probable maxima (MPM) values. The results of the simulation showed that the heading control can reduce 8.2% of MPM values for the mooring lines and improve the station-keeping performance by about 16.3%. The validity of the station-keeping system that was designed was confirmed, and it is expected that the specification of mooring lines can be relaxed with the heading control. Full article
(This article belongs to the Special Issue Mooring of Floating Offshore Structures)
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