Research on Floating Body in Directional Spectrum Waves

定向谱波中浮体的研究

• 批准号: 04045026
• 负责人: HIRAYAMA Tsugukiyo
• 金额: $ 4.74万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04045026/
• 关键词: Floating Offshore Structures; Directional Spectrum Waves; Seakeeping Quality; Listed Condition; Slow Oscillation; 運動応答; 構造応答; Floating Offshore Structures; Directional Spectrum Waves; Seakeeping Quality; Listed Condition; Slow Oscillation; 運動応答; 構造応答

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.

石油生产或海洋利用场（例如浮动机场）需要浮动海上结构的稳定平台。为此，在定向光谱波中对此类结构的行为的研究，即现实的短座不规则的不规则波很重要。在这个联合项目中，通过理论和实验性的方式研究了定向频谱波中近海结构的行为。模型结构的实验是在横滨国立大学（日本）进行的。在第二年，开发了一种程序代码，用于通过所谓的奇异分布方法的方法来估计作用于半可观近海结构的流体动力。从安全的角度来看，本法规还考虑了LRGELY列出的Conditin。还开发了缓慢振荡的简单估计方法。在最后一年，与实验结果的比较证实了开发的代码。为此，进行了很大程度上列出的状况（约二十度）的实验。Furthermore，不仅钻孔钻机，而且从方向光谱波的行为的角度来处理较长的浮动机场，而且还需要考虑弹性，并且有必要清楚地考虑弹性。