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Investigation on Mooring Breakage Effects of a 5 MW Barge-Type Floating Offshore Wind Turbine Using F2A

Yang, Y, Bashir, M, Li, C and Wang, J Investigation on Mooring Breakage Effects of a 5 MW Barge-Type Floating Offshore Wind Turbine Using F2A. Ocean Engineering. ISSN 0029-8018 (Accepted)

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Abstract

Stability and integrity of the station-keeping system are vital to the safety and performance 11 of a floating offshore wind turbine (FOWT). Failure of a mooring line significantly increases the risk 12 of damage to the FOWT. Consequently, it is necessary to investigate the impacts of a mooring 13 breakage on dynamic responses of the rotor, platform and the remaining mooring lines of a FOWT. 14 In order to address the associated research needs of a FOWT subjected to mooring failures, this study 15 has analyzed and predicted the transient behaviors of a 5 MW barge-type FOWT under rated and 16 extreme conditions using a coupling framework based on FAST and AQWA (F2A) when a mooring 17 is subjected to a sudden breakage. It is found that the mooring breakages have a minor impact on the 18 aerodynamic performance and aero-elastic responses of the FOWT, although a notable yaw-deviation 19 of the rotor is caused. The platform sway and yaw motions are significantly influenced by the 20 breakage of an upwind mooring line. Thus, the tension in the remaining adjacent mooring line is 21 increased by as much as 156% and 41.6% under the examined rated and extreme conditions, 22 respectively. The emergency shutdown following the mooring line breakage decreases the platform 23 drift and yaw motions, while the platform pitch motion is enhanced by the shutdown measure due to 24 the absence of aerodynamic damping. In addition, significant reductions in the tensions of upwind 25 mooring lines that suffer the most severe tension are achieved. The shutdown measure is beneficial 26 in ensuring the operational safety of the FOWT subjected to a sudden breakage of a mooring line.

Item Type: Article
Uncontrolled Keywords: 0405 Oceanography, 0905 Civil Engineering, 0911 Maritime Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TC Hydraulic engineering. Ocean engineering
T Technology > TD Environmental technology. Sanitary engineering
Divisions: Engineering
Publisher: Elsevier
Date Deposited: 27 May 2021 12:07
Last Modified: 08 Jun 2021 09:51
DOI or Identification number: 10.1016/j.oceaneng.2021.108887
URI: https://researchonline.ljmu.ac.uk/id/eprint/15077

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