Development of interlink wear estimation method for mooring chain of floating structures: Validation and new approach using three-dimensional contact response

Takaaki Takeuchi, Tomoaki Utsunomiya, Koji Gotoh, Iku Sato

研究成果: Contribution to journalArticle査読

抄録

Long-term operation of mooring systems is one of the challenging issues of floating structures such as floating offshore wind turbines (FOWTs). For integrity assessment, fatigue and its affecting factors have generated considerable recent research interest as the occurrence of a large number of mooring chain failures at a high rate has been reported. By contrast, only few studies on the effect of nonuniform volume loss of mooring chain links due to wear can be found because of difficulties to estimate wear amounts quantitatively. Considering this issue, in this paper, validation of the quantitative interlink wear estimation method is investigated by applying to a spar-type floating structure. Firstly, the method is presented which consists of the material test, derivation of an interlink wear estimation formula with FE analysis, and calculation of mooring chain response with coupled dynamic analysis using a mass-spring model. To improve insufficient accuracy due to the mass-spring model around a clump weight and the touchdown point, the method is further modified by using a 3-D rigid-body link model. The estimation results and comparison show that the modified method distinguishing between rolling and sliding can calculate the interlink wear amount closer to the chain diameter measurements and more reasonable than the method using the conventional mass-spring model.

本文言語英語
論文番号102927
ジャーナルMarine Structures
77
DOI
出版ステータス出版済み - 5 2021

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 海洋工学
  • 材料力学
  • 機械工学

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