중량체 적용을 통한 계류선의 설계개선 방안 연구

Abstract

Abstract : The purpose of this study is to improve the design of mooring line by attaching the lumped mass into mooring line on the seabed. The numerical analysis for the redesigned mooring system is performed to analyze the effect of weight of the attached lumped mass with a commercial software of Orcaflex. Ultimate tension of the mooring system with the lumped mass is compared with that of bare mooring line in origin design. Appropriately designed weight of the lumped mass is found to induce a critical lifted point of mooring line by floater motion in ultimate condition to move toward floater position from the anchor point with similar safety factor of mooring line. On the other hand, it is shown that the excess weight of lumped mass induces the snapping in a mooring line resulting in low safety factor of mooring system. The optimal weight of lumped mass attached at mooring line on seabed contributes to reduce the mooring line length and installation area occupied by mooring system at real sea.eight of the attached lumped mass with a commercial software of Orcaflex. Ultimate tension of the mooring system with the lumped mass is compared with that of bare mooring line in origin design. Appropriately designed weight of the lumped mass is found to induce a critical lifted point of mooring line by floater motion in ultimate condition to move toward floater position from the anchor point with similar safety factor of mooring line. On the other hand, it is shown that the excess weight of lumped mass induces the snapping in a mooring line resulting in low safety factor of mooring system. The optimal weight of lumped mass attached at mooring line on seabed contributes to reduce the mooring line length and installation area occupied by mooring system at real sea.