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Global responses analysis of a semi-submersible platform with different mooring models in South China Sea

机译：南海具有不同系泊模式的半潜式平台的全球响应分析

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摘要

For semi-submersible platform applications in deepwater oilfield development in the South China Sea, selection analysis for mooring positioning system is one of the key issues in the design of offshore structures. Based on a semi-submersible platform model in three different water depths of 500 m, 1000 m and 1500 m, three types of mooring systems - catenary, semi-taut and taut - are considered, respectively. The three mooring systems have similar static restoring force characteristics and the same number of mooring lines and angle arrangement. The dynamic coupling effects between the semi-submersible platform and its mooring lines are investigated via numerical simulation. A three-dimension hydrodynamic finite element model of the semi-submersible platform is firstly built. The wave forces based on the diffraction theory are calculated using a boundary element method. The wind forces are obtained from wind tunnel tests using a 1:100 scale model of the platform, and the current forces are regarded as steady. The platform motion under the combined action of wind, wave and current is determined using the Runge-Kutta method under one-year and 100-year return period environmental conditions in the South China Sea. The specific numerical results, analyses and conclusions would be helpful in the selection of the mooring system and in the motion performance study of the semi-submersible platform preliminary design.
机译：对于南海深水油田开发中的半潜式平台应用，系泊定位系统的选择分析是海上结构设计的关键问题之一。基于在500 m，1000 m和1500 m三种不同水深下的半潜式平台模型，分别考虑了三种类型的系泊系统-悬链，半张紧和张紧。这三个系泊系统具有相似的静态恢复力特性，并具有相同数量的系泊缆线和角度布置。通过数值模拟研究了半潜平台与其系泊索之间的动力耦合效应。首先建立了半潜水平台的三维水动力有限元模型。基于衍射理论的波浪力是使用边界元法计算的。风力是使用平台的1：100比例模型从风洞测试中获得的，当前力被认为是稳定的。在南海的一年和100年回归期环境条件下，使用Runge-Kutta方法确定在风，浪和流共同作用下的平台运动。具体的数值结果，分析和结论将有助于系泊系统的选择和半潜式平台初步设计的运动性能研究。

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