权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Response Characteristics of Open-sea type Semi-submersible Type Very Large Floating Structure and its Mooring System

远海型半潜式超大型浮式结构及其系泊系统响应特性

基本信息

批准号：
09355037
负责人：
YOSHIDA Koichiro
金额：
$ 13.95万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09355037/
关键词：
Very Large Floating Streucture Open Sea Wind Load Slant Tension Leg Mooring Progressive Collapse Natural Frequency Semi-Submersible Hydro-Elastic Response

项目摘要

A semi-submersible type Very Large Floating Structure (VLFS) is characterized by elastic response. Relations between major design parameters and response characteristics were investigated using simplified dynamic response model proposed by the authors. This model, a beam on elastic foundation, is simple but gives insight into relationship between dynamic response characteristics and major design parameters. Based on the design guideline obtained from this research, a conceptual VLFS is designed, and through a series of computer simulations and experiments, effectiveness of proposed design guideline was displayed. Hydroelasticity and hydrodynamic interactions is fully considered in the numerical analysis method proposed in this research.Lift force, an important load which has been less discussed so far, was investigated. Wind-wave tank experiments on semisubmersible type VLFS in regular progressive waves were conducted. The importance of lift force, especially at leading edge of deck, was verified from the experimental results : Lift forces and wind pressures were measured as a function of column diameter, unit number and wave conditions. The results showed that fluctuation in lift force caused by interaction between wind and wave was significantly large and can be comparable in magnitude to mean lift force in typhoon conditions. The lift force model consists of time averaged mean component and fluctuating component was proposed.General mooring characteristics of existing mooring systems were investigated. From this investigation, inclined tension leg mooring was proposed to makes horizontal motion pretically small. Progressive collapse behavior of inclined tension leg mooring system was studied in view of system safety. Experiments using 1/333 scale model were conducted. Time domain analysis program, in which in-plane response is modeled as a beam and out-of-plane response as a plate, was developed and experimental results were analyzed.

半潜式超大型浮式结构物具有弹性响应的特点。利用作者提出的简化动力响应模型，研究了主要设计参数与响应特性的关系。该模型为弹性地基梁，结构简单，但能反映结构动力响应特性与主要设计参数之间的关系。基于本研究得到的设计准则，设计了一个概念上的超大型浮体系统，并通过一系列的计算机仿真和实验，验证了所提出的设计准则的有效性。本文提出的数值分析方法充分考虑了水弹性和水动力的相互作用，对目前讨论较少的一种重要荷载--提升力进行了研究。进行了规则波作用下半潜式超大型浮体的风浪水槽试验。从实验结果中验证了升力的重要性，特别是在甲板前缘：测量了升力和风压作为柱径、单元数和波浪条件的函数。结果表明，风浪相互作用引起的升力波动较大，其大小与台风条件下的平均升力相当。提出了由时间平均分量和波动分量组成的升力模型，研究了现有系泊系统的一般系泊特性。从这项研究中，提出了斜拉腿系泊，以使水平运动预先小。从系统安全的角度出发，研究了斜拉腿系泊系统的连续倒塌行为。采用1/333比例尺模型进行了试验。编制了面内响应为梁、离面响应为板的时域分析程序，并对实验结果进行了分析。