심해저 채광 시스템 유연관의 안정성을 위한 부력재 배치에 대한 연구

Abstract

This paper concerns the efficient arrangement of the buoyancy module, which is used for stable dynamic motion and structure stability of the marine riser. The main method of this study is simulation-based design by using multi-body dynamics simulation. The marine riser connects between the vessel and the seabed device. The motion of riser affects the motion of the vessel and the device. The riser of the deep-seabed integrated mining system has a strong effect on healthy transfer of mineral. So, the buoyancy module must be equipped to supplement problems of the structure stability and the dynamic motion. Positions and quantity of the equipping buoyancy modules is determined by the real sea experiment. But it is not easy because the real sea experiment is costly and time-consuming. Thus, the position and quantity must be found by simulation. The dynamic analysis models of the riser and the buoyancy module were built in the commercial software DAFUL. In sea environment, factors affecting behavior are current, drag force, etc. These factors are applied by the FSI method. simulation. The marine riser connects between the vessel and the seabed device. The motion of riser affects the motion of the vessel and the device. The riser of the deep-seabed integrated mining system has a strong effect on healthy transfer of mineral. So, the buoyancy module must be equipped to supplement problems of the structure stability and the dynamic motion. Positions and quantity of the equipping buoyancy modules is determined by the real sea experiment. But it is not easy because the real sea experiment is costly and time-consuming. Thus, the position and quantity must be found by simulation. The dynamic analysis models of the riser and the buoyancy module were built in the commercial software DAFUL. In sea environment, factors affecting behavior are current, drag force, etc. These factors are applied by the FSI method.