터렛 계류된 부유체의 안정성에 관한 연구

Abstract

Turret moored floating platforms, such as FPSO, FSRU and FSU weathervane on a turret to wave, current and wind. Turret is a single point mooring system and usual floating platforms has bilateral symmetry with respect to the longitudinal axis. So, these vessels can oscillate from side to side or move to one particular direction, and eventually shows large yaw motion. Yaw of these vessels is one of factors to affect the motion, mooring load and offloading operation. In the tandem and side-by-side configuration, yaw is more important which influences on STS (Ship To Ship) mooring, operation possibility (downtime). It is necessary that the behavior of yaw should be analyzed thoroughly for the design of mooring system and the assessment of operability and safety. In order to investigate the behavior of yaw, some analytic studies and experiments were carried out at MOERI’s ocean engineering basin. To analyse the stability, the analytic method was used considering the static and dynamic stability. The equations of motion are linearized for stability analysis. The hydrodynamic forces were calculated by solving the boundary value problem which is solved by the higher-order boundary element method. To verify the analysis method, the results of a single floating body were compared with that of experiments. The turret moored vessel was unstable from regular wave period 15 to 20 sec, but stable in irregular waves. The results ofs. So, these vessels can oscillate from side to side or move to one particular direction, and eventually shows large yaw motion. Yaw of these vessels is one of factors to affect the motion, mooring load and offloading operation. In the tandem and side-by-side configuration, yaw is more important which influences on STS (Ship To Ship) mooring, operation possibility (downtime). It is necessary that the behavior of yaw should be analyzed thoroughly for the design of mooring system and the assessment of operability and safety. In order to investigate the behavior of yaw, some analytic studies and experiments were carried out at MOERI’s ocean engineering basin. To analyse the stability, the analytic method was used considering the static and dynamic stability. The equations of motion are linearized for stability analysis. The hydrodynamic forces were calculated by solving the boundary value problem which is solved by the higher-order boundary element method. To verify the analysis method, the results of a single floating body were compared with that of experiments. The turret moored vessel was unstable from regular wave period 15 to 20 sec, but stable in irregular waves. The results of