深水系泊缆绳动力响应研究
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摘要
考虑波浪、海流、顶部浮体运动与海底接触效应的影响,依据集中质量法建立系泊缆绳柔性力学模型,以一座深水半潜式平台的系泊系统为例,对比研究了各种因素对于缆绳动态张力与水中构型的影响程度,最后采用模型试验方法对数值计算结果进行验证。研究表明:缆绳的动态系泊张力主要由浮体运动所引起,可达总张力的20%左右,海流流速可使得缆绳形态出现大变形,导致缆绳卧底长度发生明显改变,危及平台作业安全,波浪与海底摩擦对于缆绳响应的直接作用较小,设计阶段基本可以忽略不计。
Considering wave, current, the motion of platform and the touch effects of the seabed, a flexible mechanics model of the mooring line in deep water is established according to lumped mass method. As an example,the dynamic response of a mooring line of a semi-submerged platform is obtained and the influence of some factors on the tension and configuration is compared. Finally, the model experiment is carried out in order to verify the results. It shows that the dynamic tension which makes up to 20% of the whole tension is mainly caused by the motion of the floating platform, the current will induces large deformation of the mooring line configuration and the lying length of cable changes significantly, which makes the platform in danger. The effect of wave and the friction of the seabed play a small role in the response of the cable and can be ignored at the design stage.
Considering wave, current, the motion of platform and the touch effects of the seabed, a flexible mechanics model of the mooring line in deep water is established according to lumped mass method. As an example,the dynamic response of a mooring line of a semi-submerged platform is obtained and the influence of some factors on the tension and configuration is compared. Finally, the model experiment is carried out in order to verify the results. It shows that the dynamic tension which makes up to 20% of the whole tension is mainly caused by the motion of the floating platform, the current will induces large deformation of the mooring line configuration and the lying length of cable changes significantly, which makes the platform in danger. The effect of wave and the friction of the seabed play a small role in the response of the cable and can be ignored at the design stage.
引文
[1]杨敏冬,滕斌,勾莹.海洋系泊缆索非线性有限元静力分析[J].海洋工程,2009,27(2):14-20.
[2]唐友刚,张若瑜,刘利琴.深海系泊系统动张力有限元计算[J].海洋工程,2009,27(4):10-22.
[3]张若瑜,唐友刚,刘利琴.不同因素对于深海系泊系统动张力的影响分析[J].天津大学学报,2011,44(4):313-318.
[4]黄维,刘海笑.新型深水系泊系统非线性循环动力分析[J].海洋工程,2010,28(2):22-28.
[5]Tahar A,Kim M H.Coupled Dynamic Analysis of Floating Structures with Polyester Mooring Lines[J].Ocean Engineering,2008,35:1676-1685.
[6]Francois M,Davies P.Characterization of polyester mooring lines[C]//Proceedings of the ASME 27thInternational Conference on offshore Mechanics and Arctic Engineering,Estoril:[s.n.],2008:OMAE2008-57136.
[7]唐友刚,张若瑜,程楠.集中质量法计算深海系泊冲击张力[J].天津大学学报,2009,42(8):695-701.
[8]唐友刚,张若瑜,易丛.考虑海底撞击力的系缆运动及张力分析[J].天津大学学报,2007,40(11):1265-1270.
[9]American petroleum institute.Design and analysis of station keeping systems for floating structures[S].API recommended practiced 2SK,2005.
[10]《海洋石油工程设计指南》编委会.海洋石油工程FPSO与单点系泊系统设计[M].北京:石油工程出版社,2010.
[11]《海洋石油工程设计指南》编委会.海洋石油工程深水油气田开发技术[M].北京:石油工程出版社,2010.
[2]唐友刚,张若瑜,刘利琴.深海系泊系统动张力有限元计算[J].海洋工程,2009,27(4):10-22.
[3]张若瑜,唐友刚,刘利琴.不同因素对于深海系泊系统动张力的影响分析[J].天津大学学报,2011,44(4):313-318.
[4]黄维,刘海笑.新型深水系泊系统非线性循环动力分析[J].海洋工程,2010,28(2):22-28.
[5]Tahar A,Kim M H.Coupled Dynamic Analysis of Floating Structures with Polyester Mooring Lines[J].Ocean Engineering,2008,35:1676-1685.
[6]Francois M,Davies P.Characterization of polyester mooring lines[C]//Proceedings of the ASME 27thInternational Conference on offshore Mechanics and Arctic Engineering,Estoril:[s.n.],2008:OMAE2008-57136.
[7]唐友刚,张若瑜,程楠.集中质量法计算深海系泊冲击张力[J].天津大学学报,2009,42(8):695-701.
[8]唐友刚,张若瑜,易丛.考虑海底撞击力的系缆运动及张力分析[J].天津大学学报,2007,40(11):1265-1270.
[9]American petroleum institute.Design and analysis of station keeping systems for floating structures[S].API recommended practiced 2SK,2005.
[10]《海洋石油工程设计指南》编委会.海洋石油工程FPSO与单点系泊系统设计[M].北京:石油工程出版社,2010.
[11]《海洋石油工程设计指南》编委会.海洋石油工程深水油气田开发技术[M].北京:石油工程出版社,2010.