半潜平台带浮子的系泊系统特性计算分析与参数优化研究

发布时间：2018-05-04 09:34

本文选题：半潜式平台 + 系泊系统　；参考：《中国舰船研究院》2014年硕士论文

【摘要】：半潜平台是当今海洋油气资源开发装备中的主流产品，为了保证半潜式平台能够在恶劣环境下的作业安全，研究半潜式平台在风、浪、流中的水动力和运动性能，合理设计半潜式平台系泊系统就显得尤为重要了。本文提出了系泊缆中增设浮子方案，探讨浮子设计参数对系泊性能的影响规律，优化系泊系统，从而来改善系泊缆低频特性和降低平台水平运动，提升平台作业能力和安全性。首先以某半潜式平台为研究对象，构建半潜式平台三维水动力模型和考虑系泊系统的耦合模型，分别采用商用软件AQWA中的频域和时域耦合动力分析方法，对平台运动和系泊特性进行分析，并与试验结果进行对比，来验证数值模拟的有效性。其次，针对系泊系统方案，构建单浮子系泊系统数学模型和计算流程，并通过水池模型试验验证了数值模拟的有效性。然后，从静态和动态两个方面探讨浮子设计参数（例如浮子位置、浮子净浮力等）对平台运动和系泊张力特性的影响规律，特别分析了平台极值运动和系泊张力低频特性，得到了非常有意义的结果，同时提出了系泊系统的单浮子优化方案，通过数值计算评估分析，大大改善了平台运动性能和系泊特性。最后，在单浮子方案的基础上，，进一步考虑多浮子情况，并构建相应的计算模型，同样通过模型试验来验证该方法的有效性。然后，研究了两浮子设计参数（例如浮子位置、浮子净浮力等）对平台运动和系泊张力特性的影响规律，获得了一些有意义的结论，同时提出了系泊系统的两浮子优化方案，并与单浮子优化方案进行比对，给出了适宜的优化结论，可为今后不同水深系泊系统加装浮子方案提供了技术支撑。
[Abstract]:Semi-submersible platform is the mainstream product of offshore oil and gas resources development equipment. In order to ensure the safety of semi-submersible platform in the harsh environment, the hydrodynamic and motion performance of semi-submersible platform in wind, wave and current is studied. It is very important to design the mooring system of semi-submersible platform reasonably. In this paper, the scheme of adding float to mooring cable is put forward, the influence of float design parameters on mooring performance is discussed, and the mooring system is optimized to improve the low frequency characteristic of mooring cable, reduce the horizontal movement of the platform, and enhance the working ability and safety of the platform. Firstly, taking a semi-submersible platform as an object of study, a three-dimensional hydrodynamic model and a coupling model with mooring system are constructed. The coupling dynamic analysis method in frequency domain and time domain in commercial software AQWA is used, respectively. The motion and mooring characteristics of the platform are analyzed and compared with the experimental results to verify the effectiveness of the numerical simulation. Secondly, the mathematical model and calculation flow of single float mooring system are constructed, and the validity of numerical simulation is verified by pool model test. Then, the influence of float design parameters (such as float position, float net buoyancy, etc.) on platform motion and mooring tension characteristics is discussed from static and dynamic aspects, especially the low frequency characteristics of platform extreme motion and mooring tension. At the same time, a single float optimization scheme for mooring system is proposed. The motion performance and mooring characteristics of the platform are greatly improved by numerical calculation and evaluation. Finally, on the basis of the single float scheme, the multi-float case is further considered, and the corresponding calculation model is constructed, and the validity of the method is also verified by the model test. Then, the influence of two float design parameters (such as float position, float net buoyancy and so on) on platform motion and mooring tension characteristics is studied, and some meaningful conclusions are obtained. At the same time, two float optimization schemes of mooring system are proposed. Compared with the optimization scheme of single float, the conclusion of optimization is given, which can provide technical support for adding float in mooring system with different water depth in the future.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P742

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