TY - JOUR
T1 - Development of interlink wear estimation method for mooring chain of floating structures
T2 - Validation and new approach using three-dimensional contact response
AU - Takeuchi, Takaaki
AU - Utsunomiya, Tomoaki
AU - Gotoh, Koji
AU - Sato, Iku
N1 - Funding Information:
This research was funded by Nippon Scotland Joint Ocean Innovation Program and partially supported by Fundamental Research Developing Association for Shipbuilding and Offshore (REDAS) and JSPS Research Fellow (20J12598) from the Japan Society for the Promotion of Science. Actual measurements used for validation of the wear estimation method were provided by TODA CORPORATION, Japan, and it is gratefully acknowledged. Mr. Takaaki Murakami, a master's student of Kyushu University, contributed to the experimental work described in Appendix A.
Funding Information:
This research was funded by Nippon Scotland Joint Ocean Innovation Program and partially supported by Fundamental Research Developing Association for Shipbuilding and Offshore (REDAS) and JSPS Research Fellow ( 20J12598 ) from the Japan Society for the Promotion of Science . Actual measurements used for validation of the wear estimation method were provided by TODA CORPORATION, Japan, and it is gratefully acknowledged. Mr. Takaaki Murakami, a master's student of Kyushu University, contributed to the experimental work described in Appendix A .
Publisher Copyright:
© 2021 The Authors
PY - 2021/5
Y1 - 2021/5
N2 - 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.
AB - 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.
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U2 - 10.1016/j.marstruc.2020.102927
DO - 10.1016/j.marstruc.2020.102927
M3 - Article
AN - SCOPUS:85100154389
SN - 0951-8339
VL - 77
JO - Marine Structures
JF - Marine Structures
M1 - 102927
ER -