On the design sea state and the design load for the fatigue strength of ship structure taking account of actual operation

• Project/Area Number: 26420829
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: FUKASAWA TOICHI 大阪府立大学, 工学(系)研究科(研究院), 教授 (80143171)
• Research Collaborator: KADOTA Kazuki ; TACHIBANA Masaki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: 船体構造設計 / 疲労強度 / 設計海象 / ウェザールーティング / 応力頻度分布 / 疲労被害度 / 船体疲労強度 / 大圏航路 / 最短時間航路 / コンテナ船

Outline of Final Research Achievements

When introducing the concept of "Design Sea State" to the fatigue strength design of ship structure, all the sea states must be considered because it is not possible to narrow down to some easily like the ultimate strength design of ship structure. In this research, several short-term sea states are firstly extracted as the model sea state, which are considered to be significant in fatigue strength of the ship, and the short-term sea states which are significant for fatigue strength are specified. Then, fatigue damage factors are calculated for the actual Pacific / Atlantic routes in case of sailing in the Great Circle Route and in the Minimum Time Route, and the difference of fatigue damage in each route is investigated from the viewpoint of sea state and sea load. Comparing these obtained results, the Design Sea State and the Design Load for the fatigue strength design of ship structure are discussed.

Research Products

• [Journal Article] コンテナ船の疲労被害度に対するウェザールーティングの影響について (2016)
  • Author(s): 立花雅樹，門田一輝，深沢塔一，田丸人意
  • Journal Title: 日本船舶海洋工学会講演会論文集 Volume: 23 Pages: 115-116
• [Journal Article] Research on the method for determining significant short-term sea states for fatigue strength of a ship (2015)
  • Author(s): T.Fukasawa and K.Kadota
  • Journal Title: Proc. 29th Asian- Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM 2015) Volume: 1 Pages: 14-19
• [Presentation] コンテナ船の疲労被害度に対するウェザールーティングの影響について (2016)
  • Author(s): 立花雅樹，門田一輝，深沢塔一，田丸人意
  • Organizer: 日本船舶海洋工学会 平成28年秋季講演会
  • Place of Presentation: 岡山コンベンションセンター
  • Year and Date: 2016-11-21
• [Presentation] Research on the method for determining significant short-term sea states for fatigue strength of a ship (2015)
  • Author(s): T.Fukasawa and K.Kadota
  • Organizer: The 29th Asian- Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2015)
  • Place of Presentation: Maritime State University named Admiral G. Nevelskoy, Vladivostok, Russia
  • Year and Date: 2015-10-12
  • Int'l Joint Research