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Collision Analysis and Residual Longitudinal Strength Evaluation of a 5 MW Spar Floating Offshore Wind Turbine Impacted by a Ship

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Abstract

As an emerging energy transition form, many floating offshore wind turbines are expected to be located far away from the coast of Ulsan, South Korea. Due to the unintended ship’s berthing mistake which could be occurred because of the huge traffic for the installation and maintenance purpose within the wind farm, however, the spar-type substructure could be impacted by a ship collision and the residual strength of the damaged structure could be reduced. In this work, the finite element analysis of a circular tube subjected to the impact loading was performed to compute the permanent deformation after a collision in ABAQUS and the numerical results were validated with an experimental data. The validated approach was further expanded for the application to calculate the permanent damage of the spar-type substructure of 5 MW floating offshore wind turbine impacted by a ship, then a residual longitudinal strength calculation approach was implemented to evaluate the residual strength based on the relation between an increase in bending moment and the corresponding curvature. Under the collision case of a ship with 3 m/s speed to a floater, the evaluation showed 4.1% reduction in the residual strength, which could be used as a basis for the assessment by O&M service providers whether the damaged substructure can be safely towed to the coast or can be maintained on-site with safety.

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Data Availability

The data that supports the finding of this research are not publicly available due to confidentiality constraints.

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Acknowledgements

I acknowledge the administrative and technical support of Offshore Floating Wind Energy System Engineering Department of University of Ulsan.

Funding

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20183010025270). This work was supported by Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (grant number: 2019H1D3A2A02102093).

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Author notes

  1. Kwangtae Ha and Jun-Bae Kim have contributed equally to the work as first authors.

Authors and Affiliations

  1. Department of Floating Offshore Wind Energy System, University of Ulsan, Ulsan, South Korea

    Kwangtae Ha

  2. Fuel Gas Technology Center, Korea Marine Equipment Research Institute (KOMERI), Busan, South Korea

    Jun-Bae Kim

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  1. Kwangtae Ha
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Contributions

K.H organized the concept of idea and paper structure, complied literature review, contributed to structuring and review of the paper, and wrote a partial of the paper. J.K compiled literature review, conceptualized ideas, performed numerical simulation, and wrote the bulk of the paper. K.H and J.H contributed equally to the work. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Kwangtae Ha.

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The authors declare no conflict of interest. And the funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

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Ha, K., Kim, JB. Collision Analysis and Residual Longitudinal Strength Evaluation of a 5 MW Spar Floating Offshore Wind Turbine Impacted by a Ship. Int. J. of Precis. Eng. and Manuf.-Green Tech. 9, 841–858 (2022). https://doi.org/10.1007/s40684-021-00390-z

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