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A study on non-linear viscous farces acting on a ship with large amplitude of motions

Research Project

Project/Area Number 12305065
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 船舶工学
Research InstitutionOSAKA PREFECTURE UNIERSITY

Principal Investigator

IKEDA Yoshiho  Osaka Prefecture University, Marine System Engineering, Professor, 大学院・工学研究科, 教授 (10117989)

Co-Investigator(Kenkyū-buntansha) KURODA Takako  Hokkaido University, Graduate School of Fisheries Sciences, JSPS Research Fellow, 大学院・水産科学研究科, 日本学術振興会特別研究員
KATAYAMA Toru  Osaka Prefecture University, Marine system Engineering, Research Associate, 大学院・工学研究科, 助手 (20305650)
大塚 耕司  大阪府立大学, 大学院・工学研究科, 助教授 (90213769)
奥野 武俊  大阪府立大学, 大学院・工学研究科, 教授 (60081395)
正岡 孝治  大阪府立大学, 工学研究科, 助教授 (10244659)
馬場 信弘  大阪府立大学, 工学研究科, 助教授 (10198947)
岡田 博雄  大阪府立大学, 工学研究科, 教授 (90081398)
Project Period (FY) 2000 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥26,150,000 (Direct Cost: ¥20,600,000、Indirect Cost: ¥5,550,000)
Fiscal Year 2003: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2002: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2001: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsship motion / ship / large motion / non-linear / rolling / drift motion / viscous forces / bilgekeels / 上下揺れ / 非線形 / 横漂流抵抗 / 大波高 / 非線形現象 / 漂流速度 / クーリガン・カーペンター数 / 跳躍運動 / 漂流抵抗係数 / 定常成分 / 固有周期 / 大振幅 / 横揺れ減衰力 / 波浪強制力 / 同調横揺れ
Research Abstract

In heavy waves, ship motions are strongly non-linear and unstable. In the present study, the characteristics of the non-linear ship motions are investigated and the roles of non-linear viscous forces on them are revealed.
It is experimentally found that in heavy beam seas a ship is experienced large amplitude roll motion in wide range of wave frequencies and a jump phenomena appears at a certain wave frequency. The large and unstable roll motions appear for a ship with similar roll and heave natural frequencies and in high wave with high frequency. it is revealed that fast drift motion of the ship cause the large and unstable roll motion by changing encounter frequency, wave-induced drift force, viscous drift resistance, roll damping and wave-induced roll exciting moment. This fact suggests that roll motion of a ship in heavy beam seas should be treated as an coupled motion of wave-frequency ship motions and steady drift motion.
A prediction method of roll damping of a ship with steady drift motion is deduced on the basis of a roll prediction method by the head investigator of the present research project. It is confirmed that the predicted results by the method are in fairly good agreement with experimental results.
The drift resistance acting on a ship with large roll motion is experimentally investigated to find the characteristics. The experiments revealed that the drift resistance coefficient due to viscosity is not constant but depends on Kc number which is defined by taking the effect of drift motion into account. A prediction method of the coefficient is deduced.
The characteristics of viscous damping forces acting a heaving body with bilge keels are experimentally investigated. It is found that strong non-linearity appears in the hydrodynamic forces because of unsymmetrical strong vortex shedding in large amplitude

Report

(5 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 黒田 貴子: "船舶の大振幅運動時の非線形特性に関する研究(第1報)-大波高横波中における船体運動の非線形性-"日本造船学会論文集. 191号. 97-103 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 黒田 貴子: "船舶の大振幅運動時の非線形特性に関する研究(第2報)-横揺れ固有周期および非線形流体力の影響-"日本造船学会論文集. 192号. 237-246 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Extreme Roll Motion in Wide Frequency Range due to Rapid Drift Motion"Proc.of the 6^<th> International Ship Stability Workshop. 1-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Drift Induced Large Roll Motion of a Ship in Heavy Beam Seas"Proc.of the 13^<th> International Offshore and Polar Engineering Conference. 524-531 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Baharuddin Ali: "Roll Damping Characteristics of Fishing Boats with and without Drift Motion"Proc.of 8^<th> International Conference on the Stability of Ships and Ocean Vehicles. 655-664 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 池田 良穂: "横波中の船体運動に及ぼす横漂流の影響"関西造船協会論文集. 241. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "A Roll Damping Prediction Method for a FPSO with Steady Drift Motion"Proc.of the 14^<th> International Offshore and Polar Engineering Conference. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Nonlinear Drift Motion of a Ship in Heavy Beam Seas"Proc.of the 14^<th> International Offshore and Polar Engineering Conference. (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Coupling Effects of Sway on Roll Motion of a Ship with Forward Speed Forwawrd Speed"Journal of the Kansai Society of Architects, Japan. No.235. 125-132 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Nonlinear Features in Large Amplitude Ship Motions (1^<st> Report) -Non-Linear Ship Motions in Heavy Beam Seas-"Journal of the Society of Naval Architects, Japan. No.191. 97-103 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Non-Linear Features in Large Amplitude Ship Motions (2nd Report)"Journal of the Society of Naval Architects, Japan. No.192. 237-246 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Extreme Roll Motion in Wide Frequency Range due to Rapid Drift Motion"Proc.of the 6^<th> International Ship Stability Workshop. 1-10 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Drift Induced Large Roll Motion of a Ship in Heavy Beam Seas"Prof. of the 13^<th> International Offshore and Polar Engineering Conference. 524-531 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Tomoya Nakatsuka: "An Experimental Study on Lateral Drift Resistance Acting on an Oscillating Hull"Journal of the Kansai Society of Architects, Japan. No.240. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Baharuddin Ali: "Roll Damping Characteristics of Fishing Boats with and without Drift Motion"Proc.of 8^<th> International Conference on the Stability of Ships and Ocean Vehicles. 655-664 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "Effects of Drift Motion on Ship Roll Motion in Beam Seas"Journal of the Kansai Society of Architects, Japan. No.241. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yoshiho Ikeda: "A Roll Damping Prediction Method for a EPSO with Steady Drift Motion"Proc.of the 14^<th> International Offshore and Polar Engineering Conference. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takako Kuroda: "Nonlinear Drift Motion of a ship in Heavy Beam Seas"Proc.of the 14^<th> International Offshore and Polar Engineering Conference. (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Baharuddin Ali: "Roll Damping Characteristics of Fishing Boats with and without Drift Motion"Proc.of 8^<th> International Conference on the Stability of Ships and Ocean Vehicles(会議論文集). 655-664 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 池田 良穂: "横波中の船体運動におよぼす横漂流の影響"関西造船協会論文集. 241(掲載予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yoshio Ikeda: "A Roll Damping Prediction Method for a FPSO with Steady Drift Motion"Proc.of the 14^<th> International Offshore and Polar Engineering Conference(会議論文集). (掲載予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takako Kuroda: "Nonlinear Drift Motion of a Ship in Heavy Beam Seas"Proc.of the 14^<th> International Offshore and Polar Engineering Conference(会議論文集). (掲載予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 黒田貴子, 池田良穂, 片山徹, 重廣律男: "船舶の大振幅運動時の非線形特性に関する研究(第1報)"日本造船学会論文集. 191. 97-103 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 黒田貴子, 池淵哲朗, 池田良穂: "船舶の大振幅運動時の非線形特性に関する研究(第2報)"日本造船学会論文集. 192. 237-246 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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