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FPSO串靠外输方式因其对环境的适应性好,安全性较高,是FPSO原油外输的主要方式。该文考虑了风、流和系泊缆索的耦合动力,建立了FPSO串靠多浮体系泊系统的时域耦合运动模型,其中浮体时域水动力系数由频域的结果通过快速傅立叶变换转换得到。数值求解时,浮体时域运动方程采用Newmark-β法,系泊缆索采用时域非线性有限元方法。基于自主开发的Fortran计算程序对南海海域一艘张紧式系泊FPSO与其配套的躺底式系泊穿梭油轮及两船间系泊大缆组成的串靠输油系统进行了理论计算,得到了FPSO及穿梭油轮的纵荡运动响应,系泊缆索上端点张力,系泊大缆张力等时间历程。通过谱分析讨论了低频波浪力和波频波浪力对FPSO串靠系泊系统的作用。同时探究了风向和流向对FPSO串靠系统的影响。该串靠多浮体系泊系统耦合动力模型能合理解释物理现象,可用于分析实际作业的串靠外输系泊系统。
Because of its good adaptability to the environment and high safety, FPSO string by external means is the main method of FPSO crude oil export. In this paper, the coupled motive force of wind, flow and mooring cable is considered, and the time-domain coupling motion model of FPSO with multi-floating mooring system is established. The time-domain coupling kinetic model of floating mooring system with floating body is obtained by the fast Fourier transform . When numerical solution, the Newmark-β method is used for the time-domain equation of motion of the floating body, and the nonlinear finite element method of the time domain is adopted for the mooring cable. Based on the independently developed Fortran calculation program, the theoretical calculation of a string-by-column oil-transporting system consisting of a tensioned mooring FPSO in the South China Sea and its accompanying bottom-mounted mooring shuttle tankers and mooring cables between the two ships has been carried out. FPSO and shuttle tanker response of the longitudinal movement, the upper end of the mooring rope tension, mooring cable tension and other time history. The effects of low-frequency wave force and wave-frequency wave force on the FPSO string-docking mooring system are discussed through spectral analysis. At the same time to explore the wind direction and flow on the FPSO string system. The coupled dynamic model of multi-floating mooring system can reasonably explain the physical phenomena and can be used to analyze the actual work of the string against the external mooring system.