摘要：地球总面积的71%是海洋面积，而海洋中拥有极为丰富的资源，但是深海海洋环境恶劣，普通钻井平台不能满足正常生产需要。因此，诞生了半潜式钻井平台，半潜式平台是目前适合于较深水域作业的先进平台。由于半潜式平台经常遭受破坏性的海上恶劣天气影响，为确保平台收到海洋环境载荷时仍能可以正常作业,因此半潜式平台在风、浪、流载荷下的水动力运动性能研究越来遇得到重视,合理设计半潜式平台系泊系统也更有研究意义。

本文运用ANSYS/AQWA软件建立了半潜式平台与锚泊系统的三维分析模型，研究了半潜式平台采用在南海极端海况下系泊系统完整时系泊链的张力反应以及改变环境载荷方向不同系泊链的张力反应；并将其与局部系泊失效下剩余系泊链张力反应对比来验证平台是否会出现剩余系泊链接连断裂的连锁反应。还将系泊完整的运动响应与系泊失效下的运动响应进行对比，验证平台是否出现极端运动响应。

关键词：半潜式平台；极端海况；局部系泊失效；系泊张力；运动响应；

Abstract：71% of the total area of the earth is the ocean area, and the ocean has a very rich resources, but the deep sea environment is poor, ordinary drilling platform can not meet the normal production needs. As a result, a semi-submersible drilling platform was created, and the semi-submersible platform was an advanced platform for deep waters. As semi-submersible platforms are often affected by destructive sea weather, the hydrodynamic performance of semi-submersible platforms is studied in order to ensure that the platform receives normal marine loads. To take attention to the rational design of semi-submersible platform mooring system is also more research significance.

In this paper, the three-dimensional analysis model of semi-submersible platform and mooring system is established by ANSYS / AQWA software. The semi-submersible platform adopts the tension response of the mooring chain in the mooring system under the extreme sea conditions in the South China Sea and changes the environmental load direction And the tension reaction of the remaining mooring chain under the partial mooring failure is verified by verifying the tension reaction of the remaining mooring chain. The motion response of the mooring complete motion response and mooring failure is also compared to verify whether the platform has an extreme motion response.

Key  words：Movement response；Extreme sea conditions；Semi-submersible platform；Mooring cable tension；Partial mooring failure；

目录

第一章 绪论 1

1.1研究背景及意义 1

1.2半潜式海洋平台简介 2

1.3系泊系统简介 3

1.4国内外系泊系统研究发展 4

1.5本章小结 6

第二章 半潜式钻井平台分析理论 7

2.1 频域内浮式结构物环境载荷计算 7

2.1.1 线性和二阶波浪理论 7

2.1.2 水动力系数与波浪力计算 7

2.1.3 风载荷计算理论 11

2.1.4 流载荷计算理论 12

2.2 时域耦合分析