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Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines

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  • Amrit Shankar Verma

    (Department of Marine Technology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
    Centre for Research-based Innovation of Marine Operations (SFI MOVE), NTNU, NO-7491 Trondheim, Norway)

  • Zhiyu Jiang

    (Department of Engineering Sciences, University of Adger, NO-4879 Grimstad, Norway)

  • Zhengru Ren

    (Department of Marine Technology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
    Centre for Research-based Innovation of Marine Operations (SFI MOVE), NTNU, NO-7491 Trondheim, Norway)

  • Zhen Gao

    (Department of Marine Technology, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
    Centre for Research-based Innovation of Marine Operations (SFI MOVE), NTNU, NO-7491 Trondheim, Norway)

  • Nils Petter Vedvik

    (Department of Mechanical and Industrial Engineering, NTNU, Richard Birkelands vei 2B, NO-7034 Trondheim, Norway)

Abstract

Installation of wind-turbine blades on monopile-type offshore wind turbines is a demanding task. Typically, a jack-up crane vessel is used, and blades are individually lifted from the vessel deck and docked with the preinstalled hub. During the process of mating, large relative motions are developed between the hub and root due to combined effects of wind-generated blade-root responses and wave-generated monopile vibrations. This can cause impact loads at the blade root and induce severe damages at the blade-root connection. Such events are highly likely to cause the failure of the mating task, while affecting the subsequent activities, and thus require competent planning. The purpose of this paper is to present a probabilistic response-based methodology for estimating the allowable sea states for planning a wind-turbine blade-mating task, considering impact risks with the hub as the hazardous event. A case study is presented where the installation system consisting of blade-lift and monopile system are modelled using multibody formulations. Time-domain analyses are carried out for various sea states, and impact velocities between root and hub are analyzed. Finally, an extreme value analysis using the Gumbel fitting of response parameters is performed and limiting sea state curves are obtained by comparing characteristic extreme responses with allowable values. It is found that the limiting sea states for blade-root mating tasks are low for aligned wind–wave conditions, and further increase with increased wind–wave misalignment. The results of the study also show that the parameter T p is essential for estimating limiting sea states given that this parameter significantly influences monopile vibrations during the blade-root mating task. Overall, the findings of the study can be used for a safer and more cost-effective mating of wind-turbine blades.

Suggested Citation

  • Amrit Shankar Verma & Zhiyu Jiang & Zhengru Ren & Zhen Gao & Nils Petter Vedvik, 2019. "Response-Based Assessment of Operational Limits for Mating Blades on Monopile-Type Offshore Wind Turbines," Energies, MDPI, vol. 12(10), pages 1-26, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1867-:d:231668
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    Citations

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    Cited by:

    1. Amrit Shankar Verma & Sandro Di Noi & Zhengru Ren & Zhiyu Jiang & Julie J. E. Teuwen, 2021. "Minimum Leading Edge Protection Application Length to Combat Rain-Induced Erosion of Wind Turbine Blades," Energies, MDPI, vol. 14(6), pages 1-26, March.
    2. Mehr Gul & Nengling Tai & Wentao Huang & Muhammad Haroon Nadeem & Moduo Yu, 2020. "Evaluation of Wind Energy Potential Using an Optimum Approach based on Maximum Distance Metric," Sustainability, MDPI, vol. 12(5), pages 1-23, March.
    3. Ren, Zhengru & Verma, Amrit Shankar & Li, Ye & Teuwen, Julie J.E. & Jiang, Zhiyu, 2021. "Offshore wind turbine operations and maintenance: A state-of-the-art review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 144(C).
    4. Stephan Oelker & Aljoscha Sander & Markus Kreutz & Abderrahim Ait-Alla & Michael Freitag, 2021. "Evaluation of the Impact of Weather-Related Limitations on the Installation of Offshore Wind Turbine Towers," Energies, MDPI, vol. 14(13), pages 1-12, June.
    5. Verma, Amrit Shankar & Yan, Jiquan & Hu, Weifei & Jiang, Zhiyu & Shi, Wei & Teuwen, Julie J.E., 2023. "A review of impact loads on composite wind turbine blades: Impact threats and classification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 178(C).
    6. Verma, Amrit Shankar & Jiang, Zhiyu & Caboni, Marco & Verhoef, Hans & van der Mijle Meijer, Harald & Castro, Saullo G.P. & Teuwen, Julie J.E., 2021. "A probabilistic rainfall model to estimate the leading-edge lifetime of wind turbine blade coating system," Renewable Energy, Elsevier, vol. 178(C), pages 1435-1455.

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