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Systematic Analysis on Mooring Systems of Large Scale Hoating Structures

大型供暖结构系泊系统系统分析

基本信息

批准号：
07405048
负责人：
YOSHIDA Koichiro
金额：
$ 10.75万
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：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07405048/
关键词：
large scale flosting structure,moring system inclined tension leg tank test initial tension freguency response function 浮体 CALM SALM テンションレグ係留カテナリー係留ドレフィン+フェンダ係留特性比較

项目摘要

As candidates of moorimg systems for large scale floating structures, five kinds of systems such as Dolphine/Jacket-Fender Mooring, Catenary Mooring, CALM,SALM and Tension-Leg Mooring were selected. The anlytical models for analyzing relations between mooring force and displacement in these mooring systems were surveyed. Based on the survey results, following simulation programs were developed : analytical theory for Catenary, application of catenary theory for CALM,numerical intrgration method for SALM,static characteristics analysis for Tension Leg and static matrix method for Dolphine/Jacket-Fender.In addition, the existing data of mooring systems were surveyed on installation depth, dimensions of mooring srtuctures, materials and so on. These data were used as input data to the analytical method developed and relations between mooring force and displacement were calculated. The results of these calculations were illustrated as figures showing water-depth vs. mooring force relation corresponding to given horizontal displacement. These figures are convenient to select appropriate mooring system corresponding to the magnitude of mooring force when horizontal allowable displacement and expected water-depth are given. On the other hand, enlargement of applicable range in the water-depth vs. mooring force relation was tried by analyzing and enlarging rationally surveyed data of each mooring system. As a result of this trial, tension leg still has possibility with respect to water-depth and mooring force. Considering this result with future mooring characteristic requirement, it is concluded that inclined tension leg will be prospective. Therefore, a large scale semisubmersible type of model was tested by regular head-sea waves and displacements, strains and fluctuated tension of legs were measured. The characteristics of inclined tension leg were analyzed and desing philosophy in floating structures moored by inclined tension legs was discussed.

作为大型浮式结构的备选系泊系统，选择了海豚/护套-护舷系泊、悬链线系泊、CALM系泊、SALM系泊和张力腿系泊五种系泊系统。研究了这些系泊系统中系泊力与位移关系的分析模型。基于调查结果，开发了悬链线的解析理论、悬链线理论在CALM中的应用、SALM的数值积分法、张力腿的静力特性分析和海豚/护套的静力矩阵法等仿真程序。此外，对现有系泊系统的安装深度、系泊结构尺寸、材料等数据进行了调查。将这些数据作为分析方法的输入数据，计算了系泊力与位移之间的关系。这些计算结果用图来说明水深与系泊力对应于给定水平位移的关系。当水平允许位移和期望水深给定时，便于根据系泊力大小选择合适的系泊系统。另一方面，通过分析和合理放大各系泊系统的实测数据，尝试扩大水深与系泊力关系的适用范围。试验结果表明，张力腿在水深和系泊力方面仍有可行性。结合未来的系泊特性要求，认为斜张力腿是有发展前景的。为此，采用常规头浪对大比例尺半潜式模型进行了测试，并测量了腿的位移、应变和波动张力。分析了斜张腿的特点，探讨了斜张腿系泊浮式结构的设计思想。