The Slow-drift Oscillation of Floating Structure

漂浮结构的慢漂振荡

• 批准号: 61460155
• 负责人: KOTERAYAMA Wataru
• 金额: $ 4.29万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-61460155/
• 关键词: Floating structure; Slow drift oscillation; Viscous damping; 係留

In the design of mooring systems for a floating ocean structure such as Tension Leg Platform and other type of semi-submersible, the slow drift oscillation is one of the most important problem. In this research project, a fundamental study on the viscous damping forces acting on TLP is carried out by using TLP model and TLP section model. The effects of hydrodynamic forces acting on mooring chains on the motions of floating structure are also researched by comparing the surge of a floating structure moored by chains in irregular waves and that of the structure moored by coil springs.The main conclusions obtained from this research project are as floows:1) Experimental results of two harmonic forced surge tests and the simple harmonic forced surge tests in regular waves shows that the viscous damping forces acting on the TLP model performing the slow drift oscillation in waves are larger than those obtained from the forced or free oscillation tests in a still water except the cases in the small reduced velocity range.2) The drag coefficient obtained on the basis of the relative velocity concept depends on the reduced velocity.

在张力腿平台等浮式海洋结构物的系泊系统设计中，慢漂振荡是最重要的问题之一。本课题采用张力腿平台模型和张力腿平台节段模型，对张力腿平台的粘性阻尼力进行了初步研究。通过比较不规则波中锚链系泊浮式结构物与螺旋弹簧系泊浮式结构物的纵荡，研究了系泊链上的水动力对浮式结构物运动的影响，得出以下主要结论：第一章两次简谐强迫纵荡试验和规则波中简谐强迫纵荡试验的结果表明，作用在TLP模型上的粘性阻尼力，除较小的折合速度范围外，波浪的阻力系数均大于静水中强迫振荡或自由振荡试验的结果。2）根据相对速度概念得到的阻力系数取决于折合速度。

项目成果

Wataru KOTERAYAMA: "Viscous Damping Force on TLP in Slow Drift Oscillation" Symposium on Practical Design of Ships and Mobile Units. I. 367-376 (1987)

Wataru KOTERAYAMA：“慢速漂移振荡中 TLP 的粘性阻尼力”船舶和移动装置实用设计研讨会。

Wataru Koterayama: Proceedings of the Third International Symposium on Practical Design of Ships and Mobil Units. (1987)

Wataru Koterayama：第三届船舶和移动装置实用设计国际研讨会论文集。

小寺山亘: Third International Symposium on practical Design of Ships and Mobile Units. Vol. I. 367-376 (1987)

Wataru Koderayama：第三届船舶和移动装置实用设计研讨会。第 I. 367-376 卷（1987 年）。

小寺山亘: 日本造船学会論文集. (1988)

小寺山渡：日本造船学会论文集（1988）。