Effect of floating substructure flexibility of large-volume 10 MW offshore wind turbine semi-submersible platforms on dynamic response

As the dimension of the floating substructures for ultra-large wind turbines increases, the flexibility of the large-volume floating substructures may increase to the extent that may significantly affect the dynamic responses of an ultra-large semi-submersible floating offshore wind turbine (FOWT), which introduces new challenges in capturing relevant physical effect in numerical simulation analysis. This paper describes a newly designed semi-submersible substructure for the Technical University of Denmark (DTU) 10 MW wind turbine, and the substructural flexibility is considered in aero-hydro-servo-elastic dynamic simulations by extending the simulation OpenFAST Code, including wave-structure interactions. A comprehensive comparison of flexible and rigid large-volume substructures models is presented to highlight the effect of substructural flexibility on the hydrodynamic loads and dynamic responses of the integrated FOWT system by implementing a fully coupled simulation analysis in the time domain. Additionally, the difference of flexible and rigid large-volume substructures models on the structural fatigue behavior of the novel semi-submersible FOWT is investigated and discussed by computing ultimate and damage-equivalent loads (DELs) for selected environmental conditions. The results show that the substructural flexibility has a significant impact on fatigue damage of the integrated FOWT system in operating sea states than that in extreme sea state.

• Record URL:
  https://doi.org/10.1016/j.oceaneng.2022.111934
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0029801822012707
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00298018
• Supplemental Notes:
  • © 2022 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Zhao, Zhixin
  • Wang, Wenhua
  • Shi, Wei
  • 0000-0002-6312-0494
  • Qi, Shengwenjun
  • Li, Xin
• Publication Date: 2022-9-1

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: 111934
• Serial:
  • Ocean Engineering
  • Volume: 259
  • Issue Number: 0
  • Publisher: Pergamon
  • ISSN: 0029-8018
  • EISSN: 1873-5258
  • Serial URL: http://www.sciencedirect.com/science/journal/00298018

Subject/Index Terms

• TRT Terms: Fatigue (Mechanics); Flexibility; Offshore structures; Semisubmersibles; Turbines
• Subject Areas: Marine Transportation; Terminals and Facilities;

Filing Info

• Accession Number: 01852706
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 22 2022 5:06PM