水深对软刚臂单点系泊FPSO动力响应的影响

发布时间：2018-03-14 10:22

本文选题：多体动力学　切入点：软刚臂系泊系统　出处：《海洋工程》2016年01期 　论文类型：期刊论文

【摘要】：系泊系统的定位能力是浅水油田作业的软刚臂式单点系泊FPSO安全作业的重要保障,为研究不同水深/吃水比下单点系泊系统的受力性能,针对一艘16万吨级软刚臂单点系泊FPSO,在线性三维势流理论的基础上,基于多体动力学方法,建立FPSO-系泊腿-软刚臂的耦合模型,采用Newman近似法和Pinkster近似法分析了FPSO所受二阶波浪力,在时域内计算了不同水深/吃水比对系泊系统动力响应性能的影响。结果表明,随着水深/吃水比的增加,Newman近似法计算得到二阶波浪力先增大后减小,引起单点系泊系统载荷先增大后减小;而Pinkster近似法计算得到的二阶波浪力逐渐减下,引起单点载荷逐渐减下。在浅水条件下,Pinkster近似法具有较好的适用性,Newman近似法严重低估了FPSO所受的二阶波浪力;在深水条件下,Newman近似法能满足工程计算的要求;适用两种方法的临界水深/吃水比为1.64。
[Abstract]:The positioning ability of mooring system is an important guarantee for the safe operation of soft rigid arm type single point mooring FPSO in shallow water oilfield. In order to study the mechanical performance of mooring system with different water depth / draft ratio, On the basis of linear three-dimensional potential flow theory and multi-body dynamics method, a coupling model of FPSO-mooring leg and flexible rigid arm is established for a single point mooring FPSO with 160,000 dwt soft rigid arm. The second order wave force of FPSO is analyzed by using Newman approximation and Pinkster approximation. The effect of different water depth / draught ratio on the dynamic response of mooring system is calculated in time domain. With the increase of water depth / draught ratio, the second order wave force increases first and then decreases, which causes the load of single point mooring system to increase first and then to decrease, while the second order wave force calculated by Pinkster approximation method decreases gradually. The results show that the Newman approximation method can seriously underestimate the second order wave force of FPSO under the condition of shallow water, and the Newman approximation method can meet the requirements of engineering calculation under the condition of deep water. The critical depth / draft ratio of the two methods is 1.64.
【作者单位】：天津大学建筑工程学院;天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金(51279130);国家自然科学基金重点项目(51239008)
【分类号】：U674.38

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