Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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A Fundamental Study of VIV Fatigue Analysis Procedure for Dynamic Power Cables Subjected to Severely Sheared Currents

강한 전단 해류 환경에서 동적 전력케이블의 VIV 피로해석 절차에 관한 기초 연구

  • Chunsik Shim (Department. of Naval Architecture & Ocean Engineering, Mokpo National University) ;
  • Min Suk Kim (SURF R&D Center, Mokpo National University) ;
  • Chulmin Kim (LS Cable & System, Platform Technology Development Group) ;
  • Yuho Rho (LS Cable & System, Platform Technology Development Group) ;
  • Jeabok Lee (LS Cable & System, Platform Technology Development Group) ;
  • Kwangsu Chea (LS Cable & System, Platform Technology Development Group) ;
  • Kangho Kim (Grad. School, Dept. of Naval Architecture & Ocean Engineering, Mokpo National University) ;
  • Daseul Jeong (Grad. School, Dept. of Naval Architecture & Ocean Engineering, Mokpo National University)
  • 심천식 (목포대학교 조선해양공학과) ;
  • 김민석 (목포대학교 해양케이블시험연구센터) ;
  • 김철민 (LS전선 기술개발본부 기반기술연구소) ;
  • 노유호 (LS전선 기술개발본부 기반기술연구소) ;
  • 이재복 (LS전선 기술개발본부 기반기술연구소) ;
  • 채광수 (LS전선 기술개발본부 기반기술연구소) ;
  • 김강호 (목포대학교 대학원 조선해양공학과) ;
  • 정다슬 (목포대학교 대학원 조선해양공학과)
  • Received : 2023.06.16
  • Accepted : 2023.08.26
  • Published : 2023.10.20
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Abstract

The subsea power cables are increasingly important for harvesting renewable energies as we develop offshore wind farms located at a long distance from shore. Particularly, the continuous flexural motion of inter-array dynamic power cable of floating offshore wind turbine causes tremendous fatigue damages on the cable. As the subsea power cable consists of the helical structures with various components unlike a mooring line and a steel pipe riser, the fatigue analysis of the cables should be performed using special procedures that consider stick/slip phenomenon. This phenomenon occurs between inner helically wound components when they are tensioned or compressed by environmental loads and the floater motions. In particular, Vortex-induced vibration (VIV) can be generated by currents and have significant impacts on the fatigue life of the cable. In this study, the procedure for VIV fatigue analysis of the dynamic power cable has been established. Additionally, the respective roles of programs employed and required inputs and outputs are explained in detail. Demonstrations of case studies are provided under severely sheared currents to investigate the influences on amplitude variations of dynamic power cables caused by the excitation of high mode numbers. Finally, sensitivity studies have been performed to compare dynamic cable design parameters, specifically, structural damping ratio, higher order harmonics, and lift coefficients tables. In the future, one of the fundamental assumptions to assess the VIV response will be examined in detail, namely a narrow-banded Gaussian process derived from the VIV amplitudes. Although this approach is consistent with current industry standards, the level of consistency and the potential errors between the Gaussian process and the fatigue damage generated from deterministic time-domain results are to be confirmed to verify VIV fatigue analysis procedure for slender marine structures.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20203030020230). This result was supported by "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (MOE) (Project Management Number of the Foundation: Gwangju Jeonnam Platform 2021RIS-002)

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