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On the Wave Loads for Accurate Structural Design of Ships

Research Project

Project/Area Number 05650948
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 船舶工学
Research InstitutionKANAZAWA INSTITUTE OF TECHNOLOGY

Principal Investigator

FUKASAWA Toichi  Professor of the Department of Mechanical Systems Engineering, Kanazawa Institute of Technology, 工学部, 教授 (80143171)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Ichiro  Professor of the Department of Mechanical Systems Engineering, Kanazawa Institut, 工学部, 教授 (70127679)
HATTORI Yoichi  Professor of the Department of Mechanical Systems Engineering, Kanazawa Institut, 工学部, 教授 (40198768)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1993: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsStructural Design of Ships / Hydrodynamic Pressure in Waves / Fatigue Strength / Sub-Structured Model / Unbalanced Force / Boundary Condition
Research Abstract

As for the recent structural design of a ship, direct strength calculations are approved in classification society's rules, and wave loads for the calculation are given. However, it is questionable to apply such wave loads to the investigation of fatigue strength of a ship. In fatigue analysis of a ship, it is most important to estimate accurate pressure fluctuations in time and space. The stress fluctuation can be calculated with the use of the pressure fluctuations.
In this research, the fluctuations of wave pressure in time and space were calculated firstly. Surveying the pressure distributions along ships' hull, 4 typical patterns of distribution of pressure fluctuation were introduced for fatigue analysis of ships. Using this pressure, structural analyzes for fatigue strength of a ship can be conducted with the use of a sub-structured model of the ship.
In the structural analysis using the sub-structured model, however, it is not easy to apply the adequate unbalanced force and to set up the proper boundary conditions. Several empirical techniques were adopted to overcome such the difficulties so far. In this research, several methods to treat the unbalanced force and the boundary conditions in the sub-structured model of the ship were investigated secondly, and the effects of each treatment on the stress were clarified.
With the use of the introduced pressure distribution patterns, structural analyzes were performed for a sub-structured model with proper unbalanced forces and boundary conditions surveyed herein. The stress distributions on the inner bottom plate and the bilge hopper tank plate were investigated, and the design wave loads for fatigue analysis of a ship are classified.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 深沢塔一、服部陽一、大字正晃、諸田博: "大型船の疲労強度検討のための波浪変動圧分布に関する研究" 日本造船学会論文集. 第174号. 261-273 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toichi Fukasawa,Yoichi Hattori,Yasuhiro Kawai: "On the boundary conditions in the structural analysis of ships" Proc.of Eighth Technical Exchange and Advisory Meeting, TEAM-TAPEI'94. 139-153 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Fukasawa et al.: "Hydrodynamic Pressure Distribution for Fatigue Analysis of Large Ships in Waves" J.Society of Naval Architects of Japan. Vol.174. 261-273 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Fukasawa et al.: "On the Boundary Conditions in the Structural Analysis of Ships, Proc.Eighth Technical Exchange and Advisory Meeting" TEAM-TAPEI'94. 139-153 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Toichi Fukasawa,Yoichi Hattori,Yasuhiro Kawai: "On the boundary conditions in the structural analysis of ships" Proc.of Eighth Technical Exchange and Advisory Meeting,TEAM-TAPEI'94. 139-153 (Dec.1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 深沢,塔一・服部,陽一・大字,正晃・諸田,博: "大型船の疲労強度検討のための波浪変動圧分布に関する研究" 日本造船学会論文集. 第174号. 261-273 (1993)

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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