터렛 계류된 선박의 절단계류선 모델링을 위한 수치적 연구

Abstract

In this paper, a numerical analysis for the internal turret moored vessel is conducted. The target vessel has an internal turret which is located at 0.2Lpp position from the fore-side. It has 12 mooring lines which are composed of chain-wire-chain. To investigate the motion response of the vessel and structural reliability of lines, model tests should be conducted. The KRISO ocean basin has 3.2 water depth which is 192m in prototype with scaling of 1:60. In order to represent the real scale condition precisely, mooring lines need to be modified. Truncated mooring lines are designed to supplement the restriction of the flumes water depth and increase the reliability of model testing. The truncated mooring lines are composed of two different chains in order to match pre-tension, restoring curve and variation of effective line tension. Then, regular wave tests are conducted for this designed system. As comparing results of proto-type system and truncated system, it is confirmed that two systems have the static and dynamic similarities in aspect to vessels motion and mooring lines tensions.e-chain. To investigate the motion response of the vessel and structural reliability of lines, model tests should be conducted. The KRISO ocean basin has 3.2 water depth which is 192m in prototype with scaling of 1:60. In order to represent the real scale condition precisely, mooring lines need to be modified. Truncated mooring lines are designed to supplement the restriction of the flumes water depth and increase the reliability of model testing. The truncated mooring lines are composed of two different chains in order to match pre-tension, restoring curve and variation of effective line tension. Then, regular wave tests are conducted for this designed system. As comparing results of proto-type system and truncated system, it is confirmed that two systems have the static and dynamic similarities in aspect to vessels motion and mooring lines tensions.