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Mechanism of mooring line breakage of floating offshore wind turbine under extreme coherent gust with direction change condition

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Abstract

With an extreme load condition, the mooring system of a floating offshore wind turbine (FOWT) will be led to failure, such as mooring line breakage. However, the induced FOWT mooring line breakage in extreme gust still requires further study for design optimization in the future. In this paper, an aero-hydro-cable-servo time domain coupled simulation have been carried out of a NREL’s 5 MW OC4-DeepCwind semi-submersible type FOWT for investigate the mooring system response under extreme coherent gust with direction change (ECD) condition. The platform is assumed to be installed at 50 m depth location in the South China Sea. The practical ECD is simulated by a fast conversion between two wind conditions with different mean wind speeds and wind direction. In addition, the gust characteristics that can generate snap tension of mooring lines were identified, and the consequence of the induced ECD accident is investigated. ECD condition with rise time of 10 s is prone to cause a snap tension of the mooring line, and it may eventually lead to cascading mooring line breakage and potential catastrophic collision events.

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Acknowledgements

This research is supported by the National Natural Science Foundation of China (Grant Nos. 51979050, 51739001, 51579056), the Natural Science Foundation of Heilongjiang Province of China (Grant No. E2017029), and the National Science and Technology Major Project of China (Grant No. 2016ZX05057020).

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Authors and Affiliations

  1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin, 150001, China

    Gang Ma, Liang Zhong & Qingwei Ma

  2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing, 210098, China

    Xu Zhang

  3. School of Mathematics, Computer Science and Engineering, City, University of London, London, UK

    Qingwei Ma

  4. Marine Technology Centre, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia

    Hooi-Siang Kang

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  1. Gang Ma
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  2. Liang Zhong
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  3. Xu Zhang
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  4. Qingwei Ma
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  5. Hooi-Siang Kang
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Correspondence to Xu Zhang.

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Ma, G., Zhong, L., Zhang, X. et al. Mechanism of mooring line breakage of floating offshore wind turbine under extreme coherent gust with direction change condition. J Mar Sci Technol 25, 1283–1295 (2020). https://doi.org/10.1007/s00773-020-00714-9

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  • DOI: https://doi.org/10.1007/s00773-020-00714-9

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