深海Truss Spar平台水动力特性及垂荡板性能优化研究
发布时间：2019-05-22 04:02
【摘要】：随着科技的进步、人类社会的发展,人们对于能源的消耗量逐步增加。然而陆上资源日渐枯竭,人类对油气开发逐步向深海迈进,设计生产过程中所面临的水动力问题也更加复杂。我国在南海有丰富的海上油气储藏,但目前我国对南海深海海域油气开发尚未成规模且缺乏自主的关键技术。Spar平台是一种在经济和结构上均适宜适应南海深海开发的浮式平台,对Spar平台的研究已经成为热点问题。本文采用一座在墨西哥湾服役的Truss Spar平台为数值模型,海洋环境参数选用南海海况,采用数值模拟与理论分析相结合的方式,对平台频域、时域耦合响应,以及改变垂荡板结构后运动特性进行分析研究。首先对Spar平台的发展历程、总体性能、结构特点以及研究现状做了概述,重点介绍了国内外对Truss Spar平台各方面性能的研究。利用ANSYS软件建立结构有限元模型,导入水动力分析软件AQWA中进行湿表面建模。在AQWA-LINE模块中定义其重心位置和转动惯量,基于三维势流理论和Morison方程计算出不同频率波浪下结构的附加质量、辐射阻尼、波浪激励力和运动响应幅值算子(RAO)等水动力参数。通过分析可知本平台的频域运动性能良好,为下一步时域分析奠定基础。分别在作业工况和生存工况下,模拟了平台的时域运动特性,以及生存工况中结构在单根缆破断条件下的系缆张力,结果表明平台运动响应及系缆张力均在安全范围内,结构安全稳定。最后,探索了垂荡板结构的改变对平台运动的影响规律。首先选用开孔垂荡板平台与实心板平台进行水动力特性对比,结果显示垂荡板开孔可降低平台垂荡响应。然后选择6种不同开孔面积比率的平台做了频域和时域水动力对比,总结了水动力参数随开孔面积比率的变化规律,得出最佳开孔面积比率在5%左右。在此基础上,进一步考虑了开孔间距与数量对平台运动特性的影响,规律表明平台运动响应总体变化趋势不大。为简化建造工艺,可以考虑用1个孔替代多孔,为今后Truss Spar平台的设计提供了一定参考。
[Abstract]:With the progress of science and technology and the development of human society, people's consumption of energy is gradually increasing. However, with the depletion of onshore resources, human oil and gas development is gradually moving to the deep sea, and the hydrodynamic problems in the process of design and production are also more complex. China is rich in offshore oil and gas reserves in the South China Sea. However, at present, China has not yet reached a scale and lacks independent key technologies for oil and gas development in the deep-sea areas of the South China Sea. Spar platform is a floating platform suitable for deep-sea development in the South China Sea economically and structurally. The research on Spar platform has become a hot issue. In this paper, a Truss Spar platform serving in the Gulf of Mexico is used as a numerical model, the marine environment parameters are selected from the South China Sea, and the coupling responses to the platform in frequency domain and time domain are combined by numerical simulation and theoretical analysis. The motion characteristics of the vertical plate structure are analyzed and studied after changing the structure of the vertical plate. Firstly, the development process, overall performance, structural characteristics and research status of Spar platform are summarized, with emphasis on the research on the performance of Truss Spar platform at home and abroad. The finite element model of the structure is established by ANSYS software, and the wet surface modeling is carried out by introducing the hydrodynamic analysis software AQWA. The position of the center of gravity and the moment of inertia are defined in the AQWA-LINE module. Based on the three-dimensional potential flow theory and Morison equation, the additional mass and radiation damping of the structure under different frequencies are calculated. Hydrodynamic parameters such as wave excitation force and motion response amplitude operator (RAO). Through the analysis, it can be seen that the frequency domain motion performance of the platform is good, which lays a foundation for the next time domain analysis. The time domain motion characteristics of the platform and the cable tension of the structure under the condition of single cable breaking are simulated under the working condition and the living condition, respectively. the results show that the motion response of the platform and the tension of the cable are in the safe range. The structure is safe and stable. Finally, the influence of the change of vertical plate structure on the platform motion is explored. Firstly, the hydrodynamic characteristics of the open plate platform and the solid plate platform are compared. The results show that the swing response of the platform can be reduced by the opening of the vertical plate. Then six different platforms with different hole area ratio are selected to make hydrodynamic comparison in frequency domain and time domain, and the variation law of hydrodynamic parameters with hole area ratio is summarized, and the optimum opening area ratio is about 5%. On this basis, the influence of hole spacing and number on the motion characteristics of the platform is further considered, and the law shows that the overall change trend of the motion response of the platform is not small. In order to simplify the construction process, one hole can be considered instead of porous, which provides a reference for the design of Truss Spar platform in the future.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95
本文编号：2482661
[Abstract]:With the progress of science and technology and the development of human society, people's consumption of energy is gradually increasing. However, with the depletion of onshore resources, human oil and gas development is gradually moving to the deep sea, and the hydrodynamic problems in the process of design and production are also more complex. China is rich in offshore oil and gas reserves in the South China Sea. However, at present, China has not yet reached a scale and lacks independent key technologies for oil and gas development in the deep-sea areas of the South China Sea. Spar platform is a floating platform suitable for deep-sea development in the South China Sea economically and structurally. The research on Spar platform has become a hot issue. In this paper, a Truss Spar platform serving in the Gulf of Mexico is used as a numerical model, the marine environment parameters are selected from the South China Sea, and the coupling responses to the platform in frequency domain and time domain are combined by numerical simulation and theoretical analysis. The motion characteristics of the vertical plate structure are analyzed and studied after changing the structure of the vertical plate. Firstly, the development process, overall performance, structural characteristics and research status of Spar platform are summarized, with emphasis on the research on the performance of Truss Spar platform at home and abroad. The finite element model of the structure is established by ANSYS software, and the wet surface modeling is carried out by introducing the hydrodynamic analysis software AQWA. The position of the center of gravity and the moment of inertia are defined in the AQWA-LINE module. Based on the three-dimensional potential flow theory and Morison equation, the additional mass and radiation damping of the structure under different frequencies are calculated. Hydrodynamic parameters such as wave excitation force and motion response amplitude operator (RAO). Through the analysis, it can be seen that the frequency domain motion performance of the platform is good, which lays a foundation for the next time domain analysis. The time domain motion characteristics of the platform and the cable tension of the structure under the condition of single cable breaking are simulated under the working condition and the living condition, respectively. the results show that the motion response of the platform and the tension of the cable are in the safe range. The structure is safe and stable. Finally, the influence of the change of vertical plate structure on the platform motion is explored. Firstly, the hydrodynamic characteristics of the open plate platform and the solid plate platform are compared. The results show that the swing response of the platform can be reduced by the opening of the vertical plate. Then six different platforms with different hole area ratio are selected to make hydrodynamic comparison in frequency domain and time domain, and the variation law of hydrodynamic parameters with hole area ratio is summarized, and the optimum opening area ratio is about 5%. On this basis, the influence of hole spacing and number on the motion characteristics of the platform is further considered, and the law shows that the overall change trend of the motion response of the platform is not small. In order to simplify the construction process, one hole can be considered instead of porous, which provides a reference for the design of Truss Spar platform in the future.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95
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