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자유낙하식 구명정의 진수시의 고려할 운동 형식에 대한 연구
자키(Ahmad Fauzan Zakki),배동명(Dong Myung Bae),조박(Cao Bo) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
The freefall lifeboats have been designed to be fast and reliable evacuation system. Once the occupants have gone onboard, the lifeboat is simply sliding from a skid before the free-fall. Some second after the water impact, the propulsion system can be started and the lifeboat can sail away from parent vessel. During the launching process, trajectories of free-fall lifeboats can be divided into such categories, depending on the headway and advance speed after water entry and surfacing of the lifeboats. The aim of the paper is investigating the influence of the launching parameters such as, sliding distance, angle of skid and the falling height on the motion pattern of the new type free-fall lifeboats.
자유낙하식 구명정의 가속도 응답 평가를 위한 LS-DYNA 에서의 다중물질 ALE 의 구현
자키(Ahmad Fauzan Zakki),배동명(Dong-Myung Bae) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
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. In the launching of the freefall lifeboat, during the water entry step, the fluid mesh near the structure undergoes large deformations and becomes unacceptably distorted, which drive the time step to a very small value for explicit calculations. the ALE methods or rezoning are used to create a new undistorted mesh for the fluid domain, which allows the calculations to continue. This paper is focused on implementation of multi material ALE for estimation of acceleration response of free-fall lifeboat. The results shows that Multi Material ALE is accurate for estimating the acceleration response of freefall lifeboat.