A dynamic analysis of FPSO-shuttle tanker system

摘要

In this paper, a study is made on the dynamic behavior of a FPSO-Shuttle tanker system in current, wind and waves. A three dimensional singularity distribution method is used to describe the fluid motion based on potential theory. For the estimation of wind and current forces OCIMF data are used. The static and dynamic stability of the FPSO-Shuttle tanker system is analyzed based on using the linearized equations of motion in surge, sway and yaw modes. Nonlinear responses of the system are simulated numerically. Based on it, the stability is examined from the viewpoint of the design parameters like the turret position, the mooring stiffness, the hawser length and its tension. It is found that the FPSO-Shuttle tanker system shows a quite different stability from those of the FPSO and the shuttle tanker. The main feature is that the FPSO-Shuttle tanker system does not have a fixed point but a limit cycle, although it is a dissipative and linearly stable system.