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이호영(HO-YOUNG LEE),임춘규(CHOON-GYU LIM) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.3
The anchor is laid on the seabed, and the main engine is working against incident environmental loads in a typhoon. As the main engine is broken down in the strom, the anchor chain is cut and the vessel drifts. Although a ship is moored by two-point mooring lines to maintain her position, it has crashed into a rock because of a typhoon, resulting in a possible accidental oil spillage. In this paper, we studied maintenance of a ship's position, which is analyzed based on the slow motion maneuvering equations considering wave, current, and wind. To estimate wave loads, the direct integration method is employed. The current forces are calculated, using MMG (Mathematical Modeling Group). The two-point mooring forces are quasi-statistically evaluated, using the catenary equation. The coefficients of wind forces are modeled from Isherwood's empirical data, and the variation of wind speed is estimated by wind spectrum. The nonlinear motions of a two-point moored ship are simulated, considering wave, current, and wind load, in specific domain of time.
이호영(HO YOUNG LEE),임춘규(CHOON GYU LIM),신현경(HYUN KYOUNG SHIN) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.1
A numerical analysis for wave motion in the shallow water is presented. The method is based on potential theory. The fully nonlinear free surface boundary condition is assumed in an inner domain and this solution is matched along an assumed common boundary to a linear solution in outer domain. In two-dimensional problem Cauchy's integral theorem is applied to calculate the complex potential and its time derivative along boundary.
이호영(HO-YOUNG LEE),임춘규(CHOON-GYU LIM),류재문(JAE-MOON LEW),전인식(IN-SIK CHUN) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.4
When a typoon gets into harbour, a moored ship shows erratic motions and even mooring line failure may occur. Such troubles may be caused by harbour resonance phenomena, resulting in large motion amplitudes at low frequency, which is close to the natural frequency of the moored ship. The nonlinear motions of a ship moored to quay are simulated under external forces due to wave, current including mooring forces in time domain. The forces due to waves are obtained from source and dipole distribution method in the frequency domain. The current forces are calculated by using slow motion maneuvering equation in the horizontal plane. The wind forces are calculated from the empirical formula of ABS and the mooring forces of ropes and fenders are modeled as linear spring.