1.Offshore Oil Engineering Co., Ltd.;2.TianJin University;3.Offshore Oil Engineering Co., Ltd
The buoyancy section of the LwSCR can effectively isolate the dynamic response of the hang-off point and TDP, and reduce the negative effects such as dynamic buckling of TDZ caused by the movement of FPSO. In this paper, a nonlinear mechanical model of the riser is established based on the principle of minimum potential energy, and the marine engineering analysis software OrcaFlex is used for numerical simulation. The position of the buoys is dispersed by the control variable method, and single-wave, double-wave and three-wave risers are established. Without considering the response of FPSO, the optimization effects of the mechanical characteristics of the three wave-type risers at the hot spots (hang-off point, TDP) are compared and analyzed. Considering the response of FPSO six degrees of freedom, comparing the vertical motion of the three configurations of riser and the overall von Mises stress distribution, the riser configuration with the best motion isolation effect is determined by comparing the dynamic displacement of the TDP. The results show that the dispersed arrangement of the buoys after considering the response of FPSO is conducive to the smooth transition of the vertical velocity and acceleration of the riser. Of the three configurations, the double-wave configuration has the best effect on optimizing the tension at the hot spot and has the ability to resist buckling deformation of the material. The strongest and this configuration has the best effect on isolating the motion response of FPSO.