A Study on Shallow Water Mooring System of Floating Offshore Wind Turbine with Sinker

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  • Onda Shoi
    株式会社 ORSO（研究当時，東京大学大学院）
  • Wada Ryota
    東京大学大学院新領域創成科学研究科
  • Ozaki Masahiko
    東京大学大学院新領域創成科学研究科

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  • 浅水深海域における浮体式洋上風車のシンカー付きカテナリー係留に関する研究

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<p>The purpose of this study is to investigate the feasibility of catenary chain mooring with sinker in the shallow waters of 50 to 100 meters depth facing the open ocean. Although the effect of the sinker can be expected to reduce the hardening nonlinearity of the catenary characteristics statically, it is necessary to consider the dynamic effects of sinkers ascending or sitting off the sea floor. As the procedure, we set the environmental design conditions assuming the coastal area of Japan and the semi-submersible type floating offshore wind turbine model, and perform static analysis to investigate the effect of parameters on the mooring characteristics, and then dynamic analysis to judge the strength feasibility of the mooring chains in storm conditions. Catenary theory is applied to the static analysis, and OrcaFlex is used for dynamic analysis to consider the interaction between the floating body, mooring system and sea floor in time domain. The pros and cons of using sinker in “Catenary chain with intermediate sinker type” and “Catenary with Hinged Arm Sinker Mooring type” are discussed to clarify the design considerations.</p>

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