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Extraordinary Dynamic Responses of Huge Floating Offshore Structures in Directional Spectrum Waves

Research Project

Project/Area Number 01420032
Research Category

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

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionYokohama National University

Principal Investigator

TAKEZAWA Seiji  Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (10017874)

Co-Investigator(Kenkyū-buntansha) UENO Seiya  Yokohama National University, Faculty of Engineering, Professor, 工学部, 助教授 (60203460)
HIRAYAMA Tsugukiyo  Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (00018061)
Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥32,600,000 (Direct Cost: ¥32,600,000)
Fiscal Year 1991: ¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1990: ¥12,400,000 (Direct Cost: ¥12,400,000)
Fiscal Year 1989: ¥12,200,000 (Direct Cost: ¥12,200,000)
KeywordsFloating Huge Offshore Structures / Directional Spectrum Waves / Dynamic Response in Wave / Responses in Directional Spectrum Waves / Extraordinary or Extreme Response / Elastic Response of Structures / 方向スベクトル波
Research Abstract

On huge floating offshore structures mooring in deep seas, experimental researches in irregular waves using semi-elastic models were carried out at the towing tank of Yokohama National University.
A very long model was moored by the one point mooring buoy of a tension type and directional spectrum waves simulating satisfactorily real ocean waves were also used. Such experiments have not been carried out in the world. Obtained results of this study are as follows.
1. It is certified that newly developed one point mooring buoy using 4 tensioned wires has enough performances for usage in deep and rough seas.
2. Furthermore, motions of the huge floating offshore structure moored by this buoy system are very small and satisfy completely the demands for use of artificial floating islands etc.
3. On the other hand, there is a notable tendency that the longitudinal rigidity of the huge floating offshore structures is small compared with that of the huge ships. Although the motions as a rigid body … More are negligible small as above mentioned, the elastic responses in waves appear remarkably. Especially when the natural frequency of elastic structure exist in the frequency order of wave spectra, resonance phenomena are occurred and those elastic responses become extraordinary high value to compared with wave exciting forces as input.
4. Several vibration modes are induced simultaneously and there are phase differences. Therefore elastic response characteristics are quite different due to the position in the structure.
From the obtained results, it become clear that the huge floating offshore structure is valuable for the artificial floating islands to many purposes, even if those are settled at the rough deep ocean. And this study shows a practical example of the very long floating island moored by one point tension buoy system. Moreover the results of this investigation newly indicate that the elastic structural response of the huge floating island is one of the important investigation item in the initial design stage. And some practical useful data for design of such huge offshore structure are also shown in this research. Less

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 竹沢 誠二: "方向スペクトル波中における海洋構造物の応答ーその2非線型応答" 日本造船学会論文集. 166号. 139-150 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹沢 誠二: "レ-ザ-光線群による方向スペクトル波計測" 日本造船学会論文集. 166号. 173-185 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定" 日本造船学会論文集. 168号. 261-266 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定その2" 日本造船学会論文集. 169号. 177-185 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定その3" 日本造船学会論文集. 170号. 307-317 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 竹沢 誠二: "方向スペクトル波中の超大型海洋構造物応答実験" 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] Seiji TAKEZAWA, Kentaro KOBAYASHI: "On the Motion Response of Offshore Floating Structures in Directional Spectra Wave (2nd Report)" Journal of the Society of Naval Architects of Japan. 166. 139-150 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Seiji TAKEZAWA, Kiyoshi MIYAKAWA, Takehiko TAKAYAMA, Masahiro ITABASHI: "On The Measurement of Directional Weve Spectra by the New Wave Measuring System using Laser Beams" Journal of the Society of Naval Architects of Japan. 166. 173-185 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Seiji TAKEZAWA, Tsugukiyo HIRAYAMA, Seiya UENO, Chen GAN: "Estimation of directional frequency response functions of a floating offshore structure based on experiments in directional spectrum waves" Journal of the Society of Naval Architects of Japan. 168. 261-266 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Seiji TAKEZAWA, Tsugukiyo HIRAYAMA, Seiya UENO, Chen GAN: "Estimation of directional frequency response functions of a floating offshore structure based on experiments in directional Spectrum waves (2nd report)" Journal of the Society of Naval Architects of Japan. 169. 177-185 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Seiji TAKEZAWA, Tsugukiyo HIRAYAMA, Seiya UENO, Chen GAN: "Estimation of directional frequency response functions of a floating offshore structure based on experiments in directional Spectrum waves (3rd report)" Journal of the Society of Naval Architects of Japan. 170. 307-317 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Seiji TAKEZAWA, Tsugukiyo HIRAYAMA, Seiya UENO, Hiroaki KAJIWARA: "Experiments of Responses of Very Large Floating Offshore Structures in Directional Spectrum Waves" Journal of the Society of Naval Architects 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] 竹沢 誠二: "方向スペクトル波中における海洋構造物の応答ーその2 非線型応答" 日本造船学会論文集. 166号. 139-150 (1989)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "レ-ザ-光線群による方向スペクトル波計測" 日本造船学会論文集. 166号. 173-185 (1989)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方ム周波数応答関数推定" 日本造船学会論文集. 168号. 261-266 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定 その2" 日本造船学会論文集. 169号. 177-185 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定 その3" 日本造船学会論文集. 170号. 307-317 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "方向スペクトル波中の超大型海洋構造物応答実験" 日本曽船学会論文集. 171号. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 竹沢 誠二: "方向スペクトル波中における海洋構造物の応答ーその2 非線型応答" 日本造船学会論文集. 166号. 139-150 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 竹沢 誠二: "レ-ザ-光線群による方向スペクトル波計測" 日本造船学会論文集. 166号. 173-185 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定" 日本造船学会論文集. 168号. 261-266 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 竹沢 誠二: "浮遊型海洋構造物の方向スペクトル波中実験に基づく方向周波数応答関数推定その2" 日本造船学会論文集. 169号. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 竹沢誠二: "方向スペクトル波中における海洋構造物の応答ーその2非線型応答" 日本造船学会論文集. 166号. 139-150 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 竹沢誠二: "レ-ザ光線群による方向スペクトル波計測" 日本造船学会論文集. 166号. 173-185 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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