﻿ 南海极浅水下浮式平台锚泊系统数值计算和模型试验对比
 舰船科学技术  2019, Vol. 41 Issue (8): 79-84 PDF

Comparative study on numerical calculation and model test of mooring system of floating platform in South China Sea
JIA Chang-hao, WANG Lei, LI Bo, WANG Yong-heng
State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China
Abstract: Based on the topography of the near - island reef in the South China Sea, this paper. designs a catenary mooring system, and analyzes the positioning ability of the mooring system by compared numerical calculation and model test. The model test simulates a variety of marine storm flow conditions. This paper describes the process of model test. By comparing the data of the numerical calculation and the model test, the reason of the difference of the data is found in order to predict the movement and the force of the semi-submersible platform more accurately. At the same time, the feasibility of the mooring system is verified and this paper provide the basis for the development and design of new platform and new mooring method in the future.
Key words: mooring system     numerical simulation     model test     positioning accuracy
0 引　言

1 模型试验方法及数值计算理论 1.1 相似理论

1）几何相似：大小不同，形状却完全相似。

2）运动相似：模型和实体在运动时其对应点处在任意相同时刻的同类物理量，如流体速度、加速度等都有相同的比例。

3）动力相似：流体作用于模型和实体上的各种力，如重力、惯性力、粘性力和表面张力等互相成比例。

1.2 模型制作与相关参数调节

1.3 数值计算理论

1）坐标系

2）平台时域运动方程

 $\begin{split} & \left( {M + m} \right){ {\ddot x}}\left( t \right) + \int\nolimits_{ - \infty }^t \!\!\!\!{ {k\left( { {t - \tau} } \right)}} \mathop {{\rm{ }}{ x}}\limits^g \left( t \right){\rm d}\tau + C{ x}\left( t \right) = {\rm{ }}\\ &{F^{F - K}} + {\rm{ }}{F^D} + {\rm{ }}{F^w} + {\rm{ }}{F^C} + {\rm{ }}{F^{sn}}\left( t \right) + {\rm{ }}{F^m}\left( t \right)\text{。} \end{split}$ (1)

2 锚泊系统设计及模型试验

2.1 平台锚泊系统的设计

 图 1 浮式平台12根悬链线式系泊系统示意图 Fig. 1 A schematic diagram of 12 catenary mooring systems for floating platform

2.2 模型试验

 图 2 模型入水 Fig. 2 Model into the water

 图 3 横荡衰减试验 Fig. 3 Turbulence decay test
3 平台数值计算和模型试验结果对比分析 3.1 六自由度运动时历

1）工作海况

 图 4 工作海况下平台横荡、横摇运动时历曲线对比 Fig. 4 Operation condition sway, roll time history

 图 5 生存海况下平台横荡、横摇运动时历曲线对比 Fig. 5 Survival condition sway, roll time history

2）生存海况

 图 6 生存海况7号和12号的锚链张力 Fig. 6 Force of line 7 and 12 in survival condition

3.2 系泊缆张力时历分析

3.3 锚点处锚抓力统计结果分析

4 结　语

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