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Field Observation of Orbital Motion in Waves

Research Project

Project/Area Number 02452188
Research Category

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

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionResearch Institute for Applied Mechanics

Principal Investigator

KOTERAYAMA Wataru  Kyushu Univ Research Institute for Applied Mechanics Professor, 応用力学研究所, 教授 (80038562)

Co-Investigator(Kenkyū-buntansha) 光易 亘 (光易 恒)  九州大学, 応用力学研究所, 教授 (30038533)
NAKAMURA Masahiko  Research Institute for Applied Mechanics Research Associate Professor, 応用力学研究科, 助手 (40155859)
KYOZUKA Yusaku  Graduate School of Engineering Science, 総合理工学研究所, 教授 (80177948)
堀 勉  九州大学, 応用力学研究所, 助手 (10199523)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 1991: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1990: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsField experiments / Wave directional function / Spreading parameter / Wave force coefficients
Research Abstract

In this research project, two major target were investigated using the data on the orbital motion in waves, one was the characteristics of wave directional function and another was the nature of the wave force coefficient. The main conclusions obtained are as follows ;
Ocean waves have been observed with a wave height meter array and a three component current meter suspended from an ocean research platform. Directional spectra of measured waves are determined using the Maximum Likelyhood Method. The results obtained with these two sets of instruments were compared and investigations revealed the following ;
(a) representation of directional function due to Mitsuyasu et al., which was developed on the basis of the well developed wave data in mid-ocean, are in good agreement with that determined here form wave data collected near the coast and contained wide range of the development stage.
(b) time series of wind speed, significant value of wave height and spreading parameter Smax at the pe … More ak frequency were in good mutual relation, and the value of Smax may be estimated practically from the significant value of wave height.
(c) measured values of the characteristics regarding the angular spreading of wave energy obtained with the wave height meter array and three-component current meter showed good agreement.
The wave forces were measured with two 2-component dynamometers set at either end of the test cylinder. The following was found.
(d) the values of Cp and CH obtained from least squares fit of the complete force time series of a random wave record were well ordered as a function of Keulegan-Carpenter number K2 defined by significant orbital displacement and the diameter of the cylinder, but those determined by the least squares fit on a wave-by-wave basis were widely scattered.
(e) ocean wave force exerted on the cylinder was well represented by Morison's formula ; the ratio of predicted wave force by this formula to the directly measured force was 90%, and the ratio was very stable throughout the experiments. Less

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 小寺山 亘,佐々木 哲,丸林 賢次,石橋 道芳: "海洋観測ステ-ションによる沿岸波浪の方向スペクトルの計測" 日本造船学会論文集. 171号. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 小寺山 亘,中村 昌彦,丸林 賢次: "不規則波中の鉛直円柱に加わる波力に関する実海域実験" 日本造船学会論文集. 171号. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] W.Koterayama and M.Nakamura: "Drag and Inertia Force Coefficients Derived from Field Tests" Proceedings of the 2nd International Offshore and Polar Engineering Conference. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] W. Koterayama, A. Sasaki, K. Marubayashi and M. Ishibashi: "Field Observations of the Directional Spectra using Ocean Research Platform" Journal of the Society of Naval Architecture of Japan. 171. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] W. Koterayama, M. Nakamura and K. Marubayashi: "Ocean Wave Forces Acting on a Vertical Cylinder Fitted to Offshore Platform" Journal of the Society of Naval Architecture of Japan. 171. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] W. Koterayama and M. Nakamura: "Drag and Inertia Force Coefficients Derived from Field Tests" Proceedings of the 2nd International Offshore and Polar Engineering Conference. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 小寺山 亘,佐々木 哲,丸林 賢次,石橋 道芳: "海洋観測ステ-ションによる沿岸波浪の方向スペクトルの計測" 日本造船学会論文集. 171号. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 小寺山 亘,中村 昌彦,丸林 賢次: "不規則波中の鉛直円柱に加わる波力に関する実海域実験" 日本造船学会論文集. 171号. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] W.Koterayama and M.Nakamura: "Drag and Inertia Force Coefficients Derived from Field Tests" Proceeding of the 2nd International Offshore and Polar Engineering Conference. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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