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Abstract Recently, free-fall lifeboats are becoming popular due to the fact that many life threatening accidents have occurred with conventional lifeboat systems. Most of the accidents happened during launching and after lowering the boat into the rough seas in high wind. During launch, the lifeboat may hit the sides of the distressed vessel, become severely damaged and occupants may fall into the sea causing injury and even death. It is impossible to launch the lifeboat if the parent vessel is listing significantly or if the falling becomes tangled. After lowering the boat into the water, it may be unable to move away from the distressed vessel if high seas and winds continually push the lifeboat towards the parent vessels or due to the inability of the engine to start. These situations become even more dangerous during fire or when the potential for an explosion exists. Many of the risks associated with conventional lifeboat systems have been substantially reduced by the free-fall lifeboat system. These problems are minimized with the free-fall lifeboat because it is not lowered into the sea. The free-fall lifeboat falls freely into the sea, generating kinetic energy as it does so. The kinetic energy, which is developed, propels the lifeboat away from the distressed vessel during and immediately after water entry. The lifeboat moves away from the danger even if the engine does not operate. This paper presents a method for design modification of a damaged free-fall lifeboat (FFLB) through the result of skid-launching free-fall test in the four falling phase, that is, sliding phase, rotation phase, free-fall phase, and water entry phase. In case of water entry phase, the damage of the free-fall lifeboat has been remedied structurally, not only reduced top deck impact area and impact pressure but also increased the modular factor of the roof deck in order to modified structure of the deck shape. Thus, it can be seen that the proposed method can be applied to improve the existing design of the FFLB.
Publication Date 2014-06-17
John-Kyu Hwang, Myung-Il Roh, Ju-Hwan Cha, "Design Modification of a Damaged Free-Fall Lifeboat for FPSO through the Free-Fall Test", Proceedings of ISOPE(International Society of Offshore and Polar Engineers) 2014, Busan, Korea, pp. 658-662, 2014.06.15-20

List of Articles
번호 분류 제목 Publication Date
100 International Conference Min-Jae Oh, Myung-Il Roh, Sung-Woo Park, Do-Hyun Chun, Jeong-Youl Lee, Myeong-Jo Son, "Operational Analysis of Container Ships Using AIS Data", Proceedings of ACDDE 2018, Okinawa, Japan, 2018.11.1-3 file 2018-11-01
99 International Conference Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Integrated Simulation Methods Based on Multibody Dynamics in Ships and Offshore Structures", Proceedings of the 32nd Asian-Pacific TEAM 2018, Wuhan, China, pp. 592-596, 2018.10.15-18 file 2018-10-17
98 International Conference Min-Jae Oh, Myung-Il Roh, Sung-Woo Park, Do-Hyun Chun, In-Il Kim, Chang-Yong Kim, Won-Joon Lee, "Estimation of Ship Energy Efficiency from Big Data Analysis", Proceedings of the 32nd Asian-Pacific TEAM 2018, Wuhan, China, pp. 262-264, 2018.10.15-18 file 2018-10-17
97 International Conference Seong-Yeob Jeong, Kuk-Jin Kang, Hyun-Soo Kim, Jung-Joong Kim, Myung-Il Roh, "A Study of Ship Safe Voyage Planning in the Northern Sea Route", Proceedings of PACOMS 2018, Jeju, Korea, 2018.10.14-17 file 2018-10-15
96 International Conference Seung-Ho Ham, Myung-Il Roh, Hye-Won Lee, "Collision Detection and Response between an LPG Tank and a Hull Structure Using Non-Interpenetration Constraints", Proceedings of the 9th ACMD 2018, Xian, China, 2018.08.19-23 file 2018-08-20
95 International Conference Hye-Won Lee, Myung-Il Roh, Seung-Ho Ham, "Modeling of a Mooring System Based on Flexible Multibody Dynamics Considering Contact with Seabed", Proceedings of the 9th ACMD 2018, Xian, China, 2018.08.19-23 file 2018-08-20
94 International Conference Sung-Woo Park, Myung-Il Roh, Min-Jae Oh, Seong-Hoon Kim, Won-Joon Lee, In-Il Kim, Chang-Yong Kim, "Estimation Model of Energy Efficiency Operational Indicator Using Public Data Based on Big Data Technology", Proceedings of ISOPE 2018, Sapporo, Japan file 2018-06-14
93 International Conference Ki-Su Kim, Myung-Il Roh, Seung-Min Lee, "Flooding Analysis Based on PBD (Position Based Dynamics) for Ships and Offshore Structures", Proceedings of ISOPE 2018, Sapporo, Japan, pp. 955-957, 2018.06.10-15 file 2018-06-14
92 International Conference Sung-Jun Lee, Myung-Il Roh, Hye-Won Lee, Jisang Ha, Il-Guk Woo, "Image-based Ship Detection and Classification for Unmanned Surface Vehicle Using Real-Time Object Detection Neural Networks", Proceedings of ISOPE 2018, Sapporo, Japan, 2018.06.10-15 file 2018-06-13
91 International Conference Hye-Won Lee, Myung-Il Roh, Seung-Ho Ham, "Ship Mooring Design Based on Flexible Multibody Dynamics", Proceedings of the 13th IMDC, Helsinki, Finland, pp. 563-566, 2018.06.10-14 file 2018-06-11
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