• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.185-186
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• 2006

The lifeboats of ship is necessary for protection of seafarer's safety. However, it have happened many accident on the Free-fall lifeboat. Hence, This study describes IMO's efforts and some solutions against constructional problem of Free-fall lifeboat regulated by SOLAS CONVENTION for prevention accident with lifeboats.

• Journal of Advanced Marine Engineering and Technology
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• v.31 no.2
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• pp.197-205
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• 2007

Lifeboats of vessels are necessary for protection of seafarer's safety. However, many accidents have been happened during free-fall type lifeboat drills on board a ship. The aim of this study describes IMO's efforts and some solutions against constructional problem of lifeboats regulated by the provisions of the SOLAS Convention for prevention of accidents with lifeboats and provides information for revising national laws in accordance with the revision of the International Conventions such as SOLAS and STCW.

• Journal of the Society of Naval Architects of Korea
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• v.48 no.6
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• pp.552-559
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• 2011

An interest in Arbitrary Lagrangian Eulerian (ALE) finite element methods has been increased due to more accurate responses in Fluid-Structure Interaction(FSI) problems. The multi-material ALE approach was applied to the prediction of the acceleration response of free-fall lifeboat, and its responses were compared to those of the single-material ALE one. It could be found that even though there was no big difference in the simulation responses of two methods, the single-material and multi-material ALE ones, the latter multi-material ALE method showed a little bit more close response to those of experimental results compared to the former single-material ALE one, especially in the x- and z-direction acceleration responses. Through this study, it could be found that several parameters in the ALE algorithms have to be examined more carefully for a good structural safety assessment of FSI problems.

• Journal of the Society of Naval Architects of Korea
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• v.47 no.5
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• pp.681-688
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• 2010

During certification of freefall lifeboats, it is necessary to estimate the injury potential of the impact loads exerted on the occupants during water entry. This paper focused on the numerical simulation to predict the acceleration response during the impact of freefall lifeboats on the water using FSI(Fluid-Structure Interaction) analysis technique of LS-DYNA code. FSI problems could be conveniently simulated by the overlapping capability using Arbitrary Lagrangian Eulerian(ALE) formulation and Euler-Lagrange coupling algorithm of LS-DYNA code. Through this study, it could be found that simulation results were in relatively good agreement with experimental ones in the acceleration peak values, and that the loading conditions were very sensitive to the acceleration responses by the experimental and simulation results.