深水钢悬链立管的动力分析

发布时间：2018-06-29 22:47

本文选题：钢悬链立管 + 动力分析　；参考：《宁波大学》2014年硕士论文

【摘要】：我国的南海油气资源非常丰富，但大部分处于深海。而我国的油气开采主要处于浅海区域，技术落后于其他国家，因此深海自主技术的研究迫在眉睫。深水开发时，立管系统必不可少。钢悬链立管是深水开发立管系统的第一选择。它和海洋缆索系统类似属于细长的海洋工程结构物，几何非线性非常显著。本文使用集中质量法来研究钢悬链立管的动力响应特性。该方法广泛应用于海洋缆索系统的动力分析，在过去的几十年中，已经得到极大的完善并且计算结果足够精确。目前大部分文献在建立模型时，大都建立在自然坐标系中，再通过坐标转换由自然坐标系转换到惯性坐标系，在计算过程中还需要去除产生奇异性的点。本文在惯性系下推导出各种作用于钢悬链立管的载荷的计算方程，由牛顿第二定律得出完整的三维集中质量模型，该模型避免了繁琐的坐标转换和奇异性的发生。同时为了编程方便，把模型转化为了矩阵形式。求解方程时，为了减少计算量和节省求解时间本文使用自适应步长的龙格库塔法，给出了三种不同形式的悬链线方程用于初值的计算，给定的初始条件不同，则选取不同形式的悬链线方程。最后本文根据上述的理论成果使用MATLAB软件编写了钢悬链立管的动力分析程序。首先使用三个算例验证了程序的准确性和有效性，之后使用该程序分析简单型钢悬链立管的动力特性，讨论了海流、立管内流以及海洋平台的运动对立管动力响应的影响。基于以上分析发现海流的流向、内流的密度对立管内部张力和弯矩的影响较大，立管以大位移的运动来适应海洋平台的运动。
[Abstract]:The South China Sea is rich in oil and gas resources, but most of them are in the deep sea. Oil and gas exploitation in China is mainly located in shallow sea area, and the technology lags behind other countries, so the research of deep sea independent technology is urgent. In deep water development, riser systems are essential. Steel catenary riser is the first choice of deep water development riser system. It is similar to the ocean cable system and belongs to the slender marine engineering structure, and the geometric nonlinearity is very significant. In this paper, the dynamic response of steel catenary risers is studied by means of lumped mass method. This method has been widely used in the dynamic analysis of ocean cable systems. In the past few decades, it has been greatly improved and the calculation results are accurate enough. At present, most of the literature is based on the natural coordinate system, and then the coordinate transformation from the natural coordinate system to the inertial coordinate system. In the process of calculation, it is necessary to remove the singularity point. In this paper, the calculation equations of various loads acting on steel catenary risers are derived under the inertial system, and the complete three-dimensional lumped mass model is derived from Newton's second law, which avoids the complicated coordinate transformation and singularity. At the same time, for the convenience of programming, the model is transformed into matrix form. In order to reduce the computation cost and save the solving time, three different catenary equations are given in this paper by using the Runge-Kutta method with adaptive step size for the initial value calculation. The given initial conditions are different. Then different forms of catenary equations are selected. Finally, the dynamic analysis program of steel catenary riser is compiled with MATLAB software according to the above theoretical results. At first, three examples are used to verify the accuracy and validity of the program, and then the dynamic characteristics of the simple steel catenary riser are analyzed, and the effects of the current, the flow in the riser and the motion of the offshore platform on the dynamic response of the tube are discussed. Based on the above analysis, it is found that the flow direction of the current and the density of the inner current have a great influence on the tension and bending moment in the tube, and the riser adopts the movement of large displacement to adapt to the motion of the offshore platform.
【学位授予单位】：宁波大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P742

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