| Project/Area Number |
17K14890
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Naval and maritime engineering
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| Research Institution | National Institute of Maritime, Port and Aviation Technology |
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Principal Investigator |
Hasegawa Kenta 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (20772130)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 極地工学 / 海氷 / 小氷盤群 / 氷荷重 / 氷板破壊 |
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| Outline of Final Research Achievements |
A numerical simulation was developed for global ice loads acting on a mono-column hull structure, which has been drilled in ice covered area, taking account of the large number of ice interaction and ice failure. We deal with multiple ice interaction by the 3D discrete element method using a physics engine, and give fluid forces to individual ice floe models assuming a simplified potential flow. Ice failure is expressed by disconnecting the constraint between elements connected to each other with a fixed joint function when the constraint force exerted on the joint exceeds a threshold based on ice strength. Simulation which reproduced the past ice tank test was carried out. As a result, it was confirmed that the reasonable ice load equivalent to the experimental result was obtained by this method, and the ice floes behavior around the structure was also reproduced.
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| Academic Significance and Societal Importance of the Research Achievements |
北極圏において豊富な石油・天然ガス資源の存在が明らかとなり、国内外で関心が高くなっている。しかしながら、北極海域では海氷や氷山による脅威から発見された油ガス田の開発はあまり進んでいない。掘削等に用いられる浮体式構造物はその位置を保持する必要があるため、氷海域での開発にはその周囲で砕氷船が海氷を細かく砕く作業を行うことが一般的に考えられているが、それよって生成された小氷盤群中の構造物に作用する氷荷重の推定技術は十分に確立されていない。本研究により、氷海域で用いられる構造物の安全性・稼働性評価技術の向上、環境保全と両立した持続可能な極海域資源開発の進展に資することが期待される。
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