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자유낙하식 구명정의 진수시의 고려할 운동 형식에 대한 연구
Ahmad Fauzan Zakki,배동명(Dong Myung Bae),조박(Cao Bo) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
The freefall lifeboats have been designed to be fast and reliable evacuation system. Once the occupants have gone on board, 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 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.
Rio Prabowo, Aditya,Myung Bae, Dong,Min Sohn, Jung,Fauzan Zakki, Ahmad,Cao, Bo,Hyung Cho, Joung Elsevier 2017 Thin-Walled Structures Vol.115 No.-
<P><B>Abstract</B></P> <P>The purpose of this paper is to study the rebounding phenomenon of a striking ship and its effect on the structural crashworthiness of the struck ship. Pioneer works on ship collision and mathematical formulations to assess energy after collision are described to summarize the behaviour of the ship structure under collision between ships in various scenarios. A benchmark study is conducted using laboratory tests of the resistance to penetration of a stiffened plate to validate the methodology of the present work, which uses finite element methods to model a series of dynamic collision scenarios. The setting and configuration of a full-scale collision analysis is introduced, along with the configurations of the defined scenarios. External and internal ship collision parameters are considered as parameters that will affect structural behaviour prior to and after ruptures. The results of the evaluation indicate that in the event of a side collision, the striking ship can either fully stuck or rebounding phenomena. These phenomena produce significant differences in term of internal energy and crushing force, which are included as crashworthiness criteria. The type of striking ship, as well as its velocity, significantly affects the rebounding of the striking ship and behaviour of the struck ship. A notable gap between medium and high-carbon steels is not found during observations of the structural crashworthiness accounting for structure materials. Finally, other criteria for assessing the mechanisms and effects of rebounding during a collision are summarized, i.e. kinetic energy, acceleration, and extent of damage.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Structural crashworthiness in side collision and ship’s rebounding are presented. </LI> <LI> Benchmark study is conducted before a series of collision scenario is calculated. </LI> <LI> Numerical experiment is performed to calculate the defined collision scenario. </LI> <LI> Significant difference is shown during fully-struck and rebounding scenarios. </LI> <LI> Zero-movement state is experienced by the striking ship before rebounding occurs. </LI> </UL> </P>
CSR규정에 따른 수정 인공생명 알고리즘을 이용한 75.5k DWT 산적화물선의 최적설계
배동명 ( Dong Myung Bae ),김학수 ( Hag Soo Kim ),( Ahmad Fauzan Zakki ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.2
The CSR rule was defined by IACS as the unified rule for a commercial ship like a bulk carrier and a tanker. It have been required more strict conditions for various parts like loading conditions, the local and girder strength, fatigue strength, FEM for the ship rule. It was changed in many parts of the ship rules. In this paper, the mid-parts of 17.5K DWT bulk carrier were optimized by the CSR rule. On the other hand, the modified artificial life algorithms with multi-object functions were developed for optimizing the scantling. It is possible to find multi-global optimum solutions in the multi-object functions. And it is faster and efficient than the artificial life algorithm. First, to be optimizing the scantling and the weight by CSR rule, that is calculated by the CSR rule. The next, the result is re-calculated by the modified artificial life algorithm with multi-object functions. The optimized results which are satisfied with the CSR rule like the minimum size and the thickness of stiffener and the minimum cost have been searched by the optimizing algorithm. And the results have been compared with the non-optimizing results.