2021 Fiscal Year Final Research Report

Ultimate longitudinal bending strength and safety assessment of a damaged ship in waves

Research Project

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Project/Area Number	19H00803
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 24:Aerospace engineering, marine and maritime engineering, and related fields
Research Institution	Osaka University
Principal Investigator	Fujikubo Masahiko 大阪大学, 工学研究科, 教授 (30156848)
Co-Investigator(Kenkyū-buntansha)	飯島一博大阪大学, 工学研究科, 教授 (50302758) 辰巳晃大阪大学, 工学研究科, 助教 (60736487) 田中義照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 (40373419) 小森山祐輔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 (90805110) 橋本博公大阪府立大学, 工学(系)研究科(研究院), 教授 (30397731)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	船体構造 / 縦曲げ最終強度 / 損傷後強度 / 波浪中応答 / 船体浸水 / 水槽試験 / 崩壊試験
Outline of Final Research Achievements	In an emergency of ships after suffering from damages due to collision or grounding, it is necessary to immediately evaluate the possibility of leading to catastrophic events such as hull breaking or sinking under encountered sea states including the required time to events. The damage effects on the ultimate hull girder collapse behavior in waves were investigated through numerical and experimental studies on the hull girder strength and the numerical studies on the wave responses including the effect of flooded water. A time-domain high-speed analysis method for structural safety assessment of ships was developed idealizing a whole ship as one-dimensional beam. These achievements form the basis of a rational and efficient system for the structural safety assessment of damaged ships in waves.
Free Research Field	船体構造強度
Academic Significance and Societal Importance of the Research Achievements	損傷船体の横断面の縦曲げ最終強度については、これまでに多くの研究が行われているが、損傷後の船体全体の波浪中崩壊挙動を、浸水とそれによる傾斜影響まで考慮しながら時間領域で明らかにするのは初めてである。さらに船体を一次元梁モデルに単純化して取り扱うことにより、緊急時の安全性評価に有用な高速計算法の開発を目的としており、海上輸送の安全性向上に資する研究である。