| The analysis of the coupling mechanism between main body and its mooring system isthe key content to the design and development of deepwater floating platform system. Atpresent, the quasi-static or the uncoupled method is widely employed to solve the couplingresponse prediction of floating platform system, but with the increase of water depth, thecoupling effect is becoming more and more visible, under which circumstances the abovemethod is already out of place. In order to complete the numerical computation of couplingeffect and the dynamic characteristics of deepwater floating platform system under theinfluence of environment load, a package of research was conducted.(1) The highly accurate semi-analytical method was introduced to compute the frequencyand time domain hydrodynamic coefficients of typical platform main bodies. The motionprediction in time domain was achieved using indirect time domain method which is based on3D potential flow theory.(2) The dynamic response analysis of platform mooring lines was presented by the finiteelement method (FEM) which took geometric nonlinearity into account. Then analysis for awide range of physical and environmental parameters contributed to make a summary ofdynamic characteristics.(3) The coupling mechanism between main body and its mooring system was expounded.A FORTRAN program was developed to analysis the time domain coupling characteristics ofthe deepwater platform. Considering the influence of regular wave, the transient andsteady-state responses characteristics of motion and dynamic tension was analyzedrespectively.(4) In order to accurately analysis the platform hydrodynamic response characteristicsand properly evaluate the reliability of producing safety, the paper took into account theinfluence of wind, random wave and current in extreme sea state, and discussed the impactsof wave spectrum peak parameter, low frequency time-varying wind load, the broken lines inextreme sea state. |
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