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1994 Fiscal Year Final Research Report Summary

Research on Floating Body in Directional Spectrum Waves

Research Project

Project/Area Number 04045026
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionUniversity-to-University Cooperative Research
Research InstitutionYokohama National University

Principal Investigator

HIRAYAMA Tsugukiyo  YOKOHAMA NATIONAL UNIVERSITY,PROFESSOR, 工学部, 教授 (00018061)

Co-Investigator(Kenkyū-buntansha) MORISHITA El  サンパウロ大学, 工学部, 助教授
NISHIMOTO Kazuo  UNIVERSITY OF SAO PAULO,A.PROFESSOR, 工学部, 助教授
TANIGUCHI Celio  UNIVERSITY OF SAO PAULO,PROFESSOR, 工学部, 教授
TACHIBANA Toshiichi  UNIVERSITY OF SAO PAULO,PROFESSOR, 工学部, 教授
MIYAKAWA Kiyoshi  YOKOHAMA NATIONAL UNIVERSITY,ASSISTANT, 工学部, 助手
MA Ning  YOKOHAMA NATIONAL UNIVERSITY,A.PROFESSOR, 工学部, 講師 (30251755)
UENO Seiya  YOKOHAMA NATIONAL UNIVERSITY,PROFESSOR, 工学部, 助教授 (60203460)
INOUE Yoshiyuki  YOKOHAMA NATIONAL UNIVERSITY,PROFESSOR, 工学部, 教授 (60126373)
MORISHITA Elio-mitio  UNIVERSITY OF SAO PAULO,A.PROFESSOR
Project Period (FY) 1992 – 1994
KeywordsFloating Offshore Structures / Directional Spectrum Waves / Seakeeping Quality / Listed Condition / Slow Oscillation
Research Abstract

Stable platform by floating offshore structures are required in the fields of oil production or ocean utilization, for example floating airport. For this purpose, research on the behaviors of such structures in directional spectrum waves namely realistic short crested irregular waves is important.
In this joint project, the behaviors of offshore structures in directional spectrum waves were investigated both by theoretical and experimental manner taking into account the situation of both Japan and Brasil in the field of ocean developement.
In the first year, observation on the spot was carried out in Brasil, and the basic experiments of model structures were carried out in Yokohama National University (Japan).
In the second year, a program code was developed for estimating hydrodynamic forces acting on semi-submersible offshore structures by the method of so called singularity distribution method. From the view point of safety, lrgely listed conditin was also considered in this code. Simple estimation method for slow oscillation was also developed.
In the final year, developed code was confirmed by the comparison with experimental results. Experiments of largely listed condition (about twenty degrees) were conducted for this purpose.
Furthermore, not only drilling rig but also long and huge floating airport was treated from the view point of its behaviores in directional spectrum waves and the necessity of considering elastisity was made clear.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 竹沢誠二、平山次清 他: "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. 172. 57-68 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 竹沢誠二、平山次清 他: "セミサブの方向スペクトル波中に於ける長周期運動の簡易推定法" 日本造船学会論文集. 174. 289-296 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平山次清、馬 寧、上野誠也: "長大柔軟構造物の方向スペクトル波中応答特性" 第12回海洋工学シンポジウム. 第12回. 145-154 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平山次清、馬 寧、上野誠也: "保留された長大弾性体の波浪中運動及び構造応答特性" 日本造船学会論文集. 175. 139-150 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平山次清、馬 寧: "長大浮体の方向スペクトル波中弾性応答及び保留系の挙動" 日本造船学会論文集. 176. 193-201 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.HIRAYAMA,N.Ma,S.Ueno: "Influence of flexibillity on the motions and deflections of an airport-oriented floating offshore structure." International Conference on Hydroelasticity in Marine Technology(Trondheim,Norway). 377-387 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takezawa, T.Hirayama et.al: "Experiments on Responses of Very Large Floating Offshore Structures in Directional Spectrum Waves" Journal of the Society of Naval Architects of Japan. 172. 57-68 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takezawa, T.Hirayama et.al: "Simple Estimation Method of the Slow Drift Motion of a Semi-submersible in Directional Spectrum Waves" Journal of the Society of Naval Architects of Japan. 174. 289-296 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirayama, N.Ma, S.Ueno: "A Study on the Responses of Huge Floating Compliant Offshore Structures in Directional Spectrum Waves" 12h Ocean Engineering Symposium. 145-154 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirayama, N,Ma, S.Ueno: "On the Response Characteristics of Motion and Deflection of Moored Long Flexible Floating Body in Waves" Journal of the Society of Naval Architects of Japan. 175. 139-150 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirayama, N.ma: "A Study on the Hydroelastic Response of a Large and Long Floating Offshore Structure and Behaviors of its Mooring System in Directional Spectrum Waves" Journal of the Society of Naval Architects of Japan. 176. 193-201 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Hirayama, N,Ma, S.Ueno: "Influence of Flexibility on the Motions and Deflections of an Airport-oriented Floating Long Offshore Structure" International Conference on Hydroelasticity in Marine Technology. 377-387 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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