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Study on Hydroelasticity for Realization of Very Large Floating Structures

Research Project

Project/Area Number 10555346
Research Category

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

Allocation TypeSingle-year Grants
Section展開研究
Research Field 海洋工学
Research InstitutionKYUSHUUNIVERSITY

Principal Investigator

KASHIWAGI Masashi  Kyushu University, Res. Inst. For Appl. Mech., Assoc. Prof., 応用力学研究所, 助教授 (00161026)

Co-Investigator(Kenkyū-buntansha) OHKUSU Makoto  Kyushu University, Res. Inst. For Appl. Mech., Professor, 応用力学研究所, 教授 (70038537)
YASUZAWA Yukitaka  Kyushu University, Faculty of Engineering, Assoc. Prof., 工学部, 助教授 (10191123)
NAKAMURA Masahiko  Kyushu University, Res. Inst. For Appl. Mech., Assoc. Prof., 応用力学研究所, 助教授 (40155859)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsHydroelasticity problems / Column-supported very large structure / Pontoon-type very large structure / Wave drift force / Hydrodynamic interactions / Transient responses / ハイブリッド型大型浮体 / 直接圧力積分法 / 運動量保存則 / 流力弾性 / 階層型相互干渉理論 / 過渡現象 / 時間領域 / セミサブ型大型浮体 / 階層型理論
Research Abstract

(1) A new calculation method was developed for a column-supported very large floating structure, in which the elastic deflection of the upper deck was represented by a superposition of natural modes of a rectangular thin plate, and hydrodynamic interactions among a great number of supporting columns were correctly taken into account.
(2) Model experiments have been conducted using 64 vertical circular cylinders arranged in 4 rows and 16 columns with equal separation distance. Measured were hydrodynamic forces on some of individual cylinders and the wave elevation along the center line of the structure. Measured results were in good agreement with the computed results by the newly-developed hierarchical interaction theory.
(3) Two different calculation methods were developed for computing the wave drift force and moment on a column-supported very large floating structure. One is the so-called "far-field" method based on the momentum-conservation principle, and the other is the "near-field" method by the direct pressure integration.The drift force on the whole 64 cylinders was precisely predicted by both methods, confirming the validity of both numerical methods. The local steady forces on each cylinder were also measured and the results were in good agreement with computed results by the "near-field" method.
(4) A time-domain calculation method was developed for evaluating transient elastic responses of a pontoon-type floating structure due to the take-off and landing of airplanes. Special efforts were devoted to the numerical accuracy and efficiency. Computed results were compared with measurements at the Ship Research Institute, which showed very good agreement confirming the validity of the developed numerical scheme.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (38 results)

All Other

All Publications (38 results)

  • [Publications] Masashi KASHIWAGI: "Hydrodynamic Interactions among a Great Number of Columns Supporting a Very Large Flexible Structure"Proc.of the 2nd Intl. Conference on Hydroelasticity in Marine Technology (Fukuoka). 165-176 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "A Hierarchical Interaction Theory for Wave Forces on a Great Number of Buoyancy Bodies"proc. of the 14th Intl. Workshop on Water Waves and Floating Bodies (port Huron). 68-71 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "A Time-Domain Green Function Method for Transient Problems of a Pontoon-Type VLFS"Proc. of the 3rd Intl. Workshop on Very Large Floating Structures (Honolulu). Vol.1. 97-104 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 柏木正,吉田正剛: "規則的に配置された多数の円柱浮体間における流体力学的相互干渉"日本造船学会第15回海洋工学シンポジウム. 231-238 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 柏木正: "コラム支持型超大型浮体に働く定常波漂流力"日本造船学会第15回海洋工学シンポジウム. 239-246 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "Wave Interactions aith Multitude of Floating Cylinders"Proc. of the 15th Intl. Workshoip on Water Waves and Floating Bodies (Caesarea). 99-102 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "Wave Drift Force and Moment on a VLFS Supported by a Great Number of Floating Columns"Proc.of the 10th Intl. Offshore and Polar Engineering Conference (Seattle). Vol.1. 49-56 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "Research on Hydroelastic Responses of VLFS : Recent Progress and Future Work"Journal of Offshore and Polar Engineering. Vol.10,No.2. 81-90 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 柏木正: "多列円柱支持型弾性浮体の波浪中挙動について"日本流体力学会年会2000講演論文集. 275-276 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "Hydrodynamic Interactions among a Great Number of Columns Supporting a Very Large Flexible Structure"Journal of Fluids and Structures. Vol.14,No.7. 1013-1034 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "A Near-Field Method for Calculating the Wave Drift Force on a Column-Supported Large Floating Structure"Proc.of Techno-Ocean 2000 Intl Symposium (Kobe). Vol.2. 539-542 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "A Time-Domain Mode-Expansion Method for Calculating Transient Elastic Responses of a Pontoon-Type VLFS"Journal of Marine Science and Technology. Vol.5,No.2. 89-100 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Hydrodynamic Interactions among a Great Number of Columns Supporting a Very Large Flexible Structure"2nd International Conference on Hydroelasticity in Marine Technology (Fukuoka). 165-176 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "A Hierarchical Interaction Theory for Wave Forces on a Great Number of Buoyancy Bodies"Proc. of 14th Int. Workshop on Water Waves and Floating Bodies (Port Huron). 68-71 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "A Time-Domain Green Function Method for Transient Problems of a Pontoon-Type VLFS."Proc. of 3rd Int. Workshop on Very Large Floating Structures (VLFS'99) (Honolulu).. Vol.1. 97-104 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.and Yoshida, S.: "Hydrodynamic Interactions among a Great Number of Cylinders arranged in a Periodic Array"Proc. of 15th Symp. of Ocean Engineering, Soc. of Nav. Arch. of Japan. 231-238 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Wave Interactions with a Multitude of Floating Cylinder"Proc. of 15th Int. Workshop on Water Waves and Floating Bodies (Caesarea, Israel). 99-102 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Wave Drift Force and Moment on a VLFS Supported by a Great Number of Floating Columns"Proc. of 10th Int. Offshore and Polar Engineering Conference (Seattle). Vol.1. 49-56 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Research on Hydroelastic Responses of VLFS : Recent Progress and Future Work"Journal of Offshore and Polar Engineering. Vol. 10, No. 2.. 81-90 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Transient Elastic Motions of a Pontoon-Type Very Large Floating Structure"Proc. of 4th Int. Conf. on Hydrodynamics : ICHD2000 (Yokohama). Vol.1. 211-216 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Hydrodynamic Interactions among a Great Number of Columns Supporting a Very Large Flexible Structure"Journal of Fluids and Structures. Vol.14, No.7.. 1013-1034 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "A Near-Field Method for Calculating the Wave Drift Force on a Column-Supported Large Floating Structure"Proc. of Techno-Ocean 2000 International Symposium (Kobe). Vol.2. 539-542 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "A Time-Domain Mode-Expansion Method for Calculating Transient Elastic Responses of a Pontoon-Type VLFS"Journal of Marine Science and Technology. Vol.5, No.2. 89-100 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kashiwagi, M.: "Second-Order Steady Forces on Multiple Cylinders in a Rectangular Periodic Array"Proc. of 16th Int. Workshop on Water Waves and Floating Bodies (Hiroshima).. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masashi KASHIWAGI: "Research on Hydroelastic Responses of VLFS : Recent Progress and Future Work"Journal of Offshore and Polar Engineering. Vol.10,No.2. 81-90 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 柏木正: "多列円柱支持型弾性浮体の波浪中挙動について"日本流体力学会年会2000講演論文集. 275-276 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masashi KASHIWAGI: "Transient Elastic Motions of a Pontoon-Type Very Large Floating Structure"Proc.of 4th Intl Conf on Hydrodynamics : ICHD2000 (Yokohama). Vol.1. 211-216 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masashi KASHIWAGI: "A Near-Field Method for Calculating the Wave Drift Force on a Column-Supported Large Floating Structure"Proc.of Techno-Ocean 2000 Intl Symposium (Kobe). Vol.2. 539-542 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masashi KASHIWAGI: "A Time-Domain Mode-Expansion Method for Calculating Transient Elastic Responses of a Pontoon-Type VLFS"Journal of Marine Science and Technology. Vol.5,No.2. 89-100 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masashi KASHIWAGI: "Second-Order Steady Forces on MUltiple Cylinders in a Rectangular Periodic Array"Proc.of 16th Intl Workshop on Water Waves and Floating Bodies (Hiroshima). (発表予定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Kashiwagi: "A Hierarchical Interaction Theory for Wave Forces on a Great Number of Buoyancy Bodies"Proc.of 14th Int.Workshop on Water Waves and Floating Bodies. 68-71 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Kashiwagi: "Research on Hydroelastic Responses of VLFS:Recent Progress and Future Work"Proc.of 9th Int.Offshore and Polar Engineering Conference. 1. 17-26 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柏木 正,吉田正剛: "規則的に配置された多数の円柱浮体間における流体力学的相互干渉"日本造船学会第15回海洋工学シンポジウムテキスト. 231-238 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柏木 正: "コラム支持型超大型浮体に働く定常波漂流力"日本造船学会第15回海洋工学シンポジウムテキスト. 239-246 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柏木 正: "超大型弾性浮体の過渡応答に関する数値計算"第49回理論応用力学講演会講演集. 303-304 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柏木 正: "セミサブ型大型浮体に働く波力の階層型相互干渉計算法" 日本造船学会第14回海洋工学シンポジウムテキスト. 425-431 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M. Kashiwagi: "Hydrodynamic Interactions among a Great Number of Columns Supporting a Very Large Flexible Structure" Proc. of 2nd International Conference on Hydroelasticity in Marine Technology(Fukuoka). 165-176 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 柏木 正: "超多数の浮体群に働く相互干渉流体力と波浪場に関する階層型計算法" 第48回理論応用力学講演会講演集. 401-402 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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