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On secular terms which appear in perturbation problems of non-linear wave forces acting on offshore structures, and solutions of the problems compared with model tests

Research Project

Project/Area Number 15360461
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Naval and maritime engineering
Research InstitutionThe University of Tokyo

Principal Investigator

KINOSHITA Takeshi  The University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (70107366)

Co-Investigator(Kenkyū-buntansha) SANO Ikou  The University of Tokyo, Institute of Industrial Science, Research Associate, 生産技術研究所, 助手 (90238220)
Project Period (FY) 2003 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥14,500,000 (Direct Cost: ¥14,500,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2004: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2003: ¥3,400,000 (Direct Cost: ¥3,400,000)
Keywordswave drift force / wave drift damping / wave drift added mass / non-linear wave force / secular term / セキュラー解 / 散乱波 / エアーギャップ
Research Abstract

This research analyzes nonlinear wave loads using perturbation method. Higher order nonlinear hydrodynamic forces such as third order wave excitation and wave drift added mass had not been obtained due to secular terms which appear in higher order problems, whilst lower hydrodynamic forces such as second order wave excitation and wave drift damping can be obtained. Therefore even if we calculate full nonlinear problem using pure numerical method such as a finite difference method, we have no bench marks to be compared to assure its accuracy. This research presents new analysis method of solution to these secular term problems, as well as measurement method of experiment to verify the solutions of this new analysis.
First year we solved the problem of a vertical circular cylinder in both wave and current by the eigenfunction expansion method, and compared free surface elevation with the measured date by Swan et al. Second year we extended our method to the problem of floating vertical cylinder from the cylinder touching to the bottom. Third and the last year we developed a hybrid method combining near field boundary element method (BEM) and far field eigenfunction expansion method. We obtained wave drift added mass of a spheroids.
We developed a measurement method to obtain maneuvering hydrodynamic force derivatives by Planar Motion Mechanism (PMM) in waves. These derivatives verify the solutions of this new analysis.

Report

(5 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (21 results)

All 2006 2005 2004 2003 Other

All Journal Article (20 results) Publications (1 results)

  • [Journal Article] New Methods to solve high order potential used in calculating non-linear wave loads2006

    • Author(s)
      Yasunori Nihei, Takeshi Kinoshita, Weiguang Bao (Ikou Sano)
    • Journal Title

      Proc. 25th International Conference on Offshore Mechanics and Arctic Engineering, ASME CD

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 波浪中PMM試験の解析結果2006

    • Author(s)
      木下 健, 鮑 (佐野)偉光, 徐 永澤
    • Journal Title

      第2回推進性能・運動性能合同研究会、日本船舶海洋工学会 CD

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Nonlinear Hydrodynamic Forces on an Accelerated Body in Waves2005

    • Author(s)
      Motoki Yoshida, Takeshi Kinoshita, W.Bao, (Ikou Sano)
    • Journal Title

      Journal of Offshore Mechanics and Arctic Engineering 127・1

      Pages: 17-30

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Nonlinear hydrodynamic forces on an accelerated body in waves2005

    • Author(s)
      Motoki Yoshida, Takeshi Kinoshita, Weiguang Bao (Ikou Sano)
    • Journal Title

      Journal of Offshore Mechanics and Arctic Engineering 127 No.1

      Pages: 17-30

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Nonlinear Hydrodynamic Forces on an Accelerated Body in Waves2005

    • Author(s)
      Motoki Yoshida, Takeshi Kinoshita, Weiguang Bao (Ikou Sano)
    • Journal Title

      Journal of Offshore Mechanics and Arctic Engineering, ASME 127,1

      Pages: 17-30

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Nonlinear wave loads acting on cylinder array slowly oscllating in diffraction and radiation wave fields2005

    • Author(s)
      Weiguang Bao (Ikou Sano), Takeshi Kinoshita, Motoki Yoshida
    • Journal Title

      Proceedings of 24th International Conference on Offshore Mechanics and Arctic Engineering, ASME (CD)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Nonlinear wave forces acting on a body of arbitrary shape slowly oscillating in waves2005

    • Author(s)
      Yasunori Nihei, Takeshi Kinoshita, Weiguang Bao (Ikou Sano)
    • Journal Title

      Proceedings of 24th International Conference on Offshore Mechanics and Arctic Engineering, ASME (CD)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Wave-drift added mass of a vertical circular cylinder derived from a moving frame formulation2004

    • Author(s)
      Weiguang Bao
    • Journal Title

      The Proceedings of the Fourteenth International Offshore and Polar Engineering Conference 3

      Pages: 455-462

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effects of slow current on diffraction wave field2004

    • Author(s)
      二瓶泰範
    • Journal Title

      第13回試験水槽委員会運動性能部会 SKP13-1(CD)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Nonlinear wave loads acting on a circular cylinder with a low-frequency surge oscillation2004

    • Author(s)
      Motoki Yoshida
    • Journal Title

      Proceedings of the 23th International Conference on Offshore Mechanics and Arctic Engineering 23(CD)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Effects of Slow Current on Diffraction Wave Field2004

    • Author(s)
      Yasunori Nihei
    • Journal Title

      Proceedings of the 2^<nd> Asia-Pacific Workshop on Marine Hydrodynamics

      Pages: 355-360

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Measured and computed results of wave drift added mass of a vertical circular cylinder or an array of vertical circular cylinders2004

    • Author(s)
      Weiguang Bao
    • Journal Title

      Proceedings of 6th International Conference on Hydrodynamics 6(CD)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 波漂流付加質量のポテンシャル理論2003

    • Author(s)
      吉田基樹, 鮑(佐野)偉光, 木下 健
    • Journal Title

      日本造船学会論文集 194

      Pages: 99-109

    • NAID

      110003879884

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 波漂流付加質量の実験と計算2003

    • Author(s)
      吉田基樹, 石橋和子, 鮑(佐野)偉光, 木下 健
    • Journal Title

      日本造船学会論文集 194

      Pages: 111-118

    • NAID

      110003879885

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 高次オーダー速度ポテンシャルの解法 -波漂流付加質量の理論計算-2003

    • Author(s)
      吉田基樹, 一色 浩, 鮑(佐野)偉光, 木下 健
    • Journal Title

      日本造船学会論文集 194

      Pages: 119-127

    • NAID

      110003879886

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 速度ポテンシャルのsecular解とnon-secular解 -波漂流付加質量の理論計算-2003

    • Author(s)
      吉田基樹, 鮑(佐野)偉光, 木下 健
    • Journal Title

      日本造船学会論文集 194

      Pages: 129-136

    • NAID

      110003879887

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A formulation to evaluate wave-drift added mass based on potential theory2003

    • Author(s)
      Motoki Yoshida, Weiguang Bao (Ikou Sano), Takeshi Kinoshita
    • Journal Title

      Journal of The Society of Naval Architects of Japan 194

      Pages: 99-109

    • NAID

      110003879884

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] An experiment and a calculation of wave-drift added mass2003

    • Author(s)
      Motoki Yoshida, Kazuko Ishibashi, Weiguang Bao (Ikou Sano), Takeshi Kinoshita
    • Journal Title

      Journal of The Society of Naval Architects of Japan 194

      Pages: 111-118

    • NAID

      110003879885

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Solutions of higher-order potentials necessary to evaluate wave-drift added mass2003

    • Author(s)
      Motoki Yoshida, Hiroshi Isshiki, Weiguang Bao (Ikou Sano), Takeshi Kinoshita
    • Journal Title

      Journal of The Society of Naval Architects of Japan 194

      Pages: 119-127

    • NAID

      110003879886

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] A method to remove secularity in the solution of velocity potential - A calculation of wave-drift added mass -2003

    • Author(s)
      Motoki Yoshida, Weiguang Bao (Ikou Sano), Takeshi Kinoshita
    • Journal Title

      Journal of The Society of Naval Architects of Japan 194

      Pages: 129-136

    • NAID

      110003879887

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Publications] 吉田基 樹, 鮑 偉光, 木下 健: "速度ポテンシャルのsecular解とnon-secular解 -波漂流付加質量の理論計算-"日本造船学会論文集. 194. 129-136 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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