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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 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
Highlights
Wind Turbine at Accidental LimitFloating offshore wind turbines (FOWT) have recently shown great potential due to the considerable wind resources and more flexible installation sites they provide compared to onshore wind turbines [1]
The second stage shows the platform drifting process, while the third stage presents the floating platform reaching a new balance in the x-direction with the two remaining mooring lines
The coupled effects of failure on this floating offshore wind turbine (FOWT) system, including the drift response of the platform, the pitch motion of the turbine, the tension on the mooring line, and the prediction of maximum drift distance method have been explored in detail in this study
Summary
Floating offshore wind turbines (FOWT) have recently shown great potential due to the considerable wind resources and more flexible installation sites they provide compared to onshore wind turbines [1]. FOWT capacity has obtained significant progress in the last decade [2,3]. According to Offshore Wind Market Report: 2021 Edition ii, in 2020 alone the global floating offshore wind capacity grew by more than three times, from. 7663 MW (2019) to 26,529 MW [4] This higher wind energy density brings with it new challenges for the offshore wind industry, the mooring system [2,3]. Similar challenges exist with respect to FOWT, and further comprehensive studies based on specific
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