| During the installation of the FPSO single point mooring system,the mooring line is in an incomplete working state,and the single point mooring system may have some serious consequences due to the external environment.At present,there are few research methods related to the installation operation process of the mooring system,and it is urgent to comb and simulate the entire installation operation process of the mooring system.At the same time,the breakage of mooring line will also cause the mooring system to be incomplete,and the breakage of mooring line during the installation operation will cause accidents during the installation and operation process.There are still some unique issues during the installation of the single point mooring system,such as broken traction ropes and sudden changes in the direction of ocean currents,which will cause changes in the FPSO motion response during the installation process and affect the safety of the mooring system installation operations.In response to the above problems,this paper,based on the three-dimensional potential flow theory,concentrated mass method and time domain coupling theory,conducts numerical simulation analysis for the situation that may occur during the installation of a FPSO mooring system in the South China Sea.According to the three-dimensional potential flow theory,a hydrodynamic model of the FPSO hull is established,and the accuracy of the hydrodynamic model is verified by comparing the RAO calculation results of multiple software.Based on the catenary principle and the concentrated mass method,using Orca Flex software,a time-domain coupling calculation model of the single point mooring system is established to analyze the static characteristics and motion response of the single point mooring system.The installation process of the inner turret single point mooring system is sorted out,and the time-domain coupling method is used to numerically simulate the series of processes to calculate and analyze the dynamic response of the mooring system during installation.In the case of an incomplete mooring system caused by the mooring line breakage,a numerical simulation of the single point mooring system under the same working conditions is carried out,and a once-in-a-century mooring line breakage tank test is carried out,and the results of the two are carried out,so as to verify the accuracy of the numerical simulation results.This paper studies the motion response of the single point mooring system when the mooring line breaks during the installation and operation process of the mooring system,and analyzes the breakage of different mooring lines and different positions of the same mooring line.The special working conditions during the installation of the mooring system are discussed,focusing on the analysis of the breakage of the traction rope and the significant changes in the direction of the ocean current during the installation and operation process.In this paper,the installation process of the single point mooring system is comprehensively sorted out.The numerical calculation model is established using the threedimensional potential flow theory and the concentrated mass method,and the cable breakage problem that may occur during the installation process is studied.The paper may play a certain role in promoting the installation of the single point mooring system. |
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