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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
» International Conference 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, 2014.06.15-20 file 2014-06-17
90 International Conference Jong-Hyeok Lee, Myung-Il Roh, Jin-Hyeok Kim, Sung-Jun Lee, Seung-Ho Ham, "Development of a Ship Navigation Simulator Based on Digital Twin Technology", Proceedings of ACDDE 2019, Penang, Malaysia, pp. 245, 2019.07.07-10 file 2019-07-08
89 International Conference Ju-Hwan Cha, Myung-Il Roh, Seung-Ho Ham, Kyu-Yeul Lee, Kwang Phil Park, Heung Won Suh, "Development of an Integrated Simulation Framework and Its Application to Shipbuilding Process Planning", Proceedings of ICCAS(International Conference on Computer Applications in Shipbuilding) 2007, Portsmouth, UK, pp. 283-290, 2007-09.18-20 file 2007-09-18
88 International Conference Ju-Hwan Cha, Seung-Ho Ham, Kyu-Yeul Lee, Myung-Il Roh, Kwang-Pil Park, Heung-Won Suh, "Discrete Event/Discrete Time Simulation of Block Erection by a Floating Crane based on Multibody System Dynamics", Proceedings of ISOPE 2009, Osaka, Japan file 2009-06-21
87 International Conference Ju-Sung Kim, Myung-Il Roh, Seung-Ho Ham, Ki-Su Kim, "Dynamic Method for Flooding Simulation of a Damaged Floater Considering Ocean Environmental Loads", Proceedings of the 30th Asian-Pacific TEAM 2016, Mokpo, Korea, 2016.10.10-13 file 2016-10-12
86 International Conference Ki-Su Kim, Jung-Woo Hong, Sol Ha, Seung-Ho Ham, Nam-Kug Ku, Myung-Il Roh, "A Method for Optimal Arrangement Design Based on Expert System and Its Application to Submarine Design", Proceedings of IMDC 2015, Tokyo, Japan, 2015.5.11-14 file 2015-05-13
85 International Conference Ki-Su Kim, Myung-Il Roh, "Optimal Arrangement Method of a Ship Considering the Performance against Flooding", Proceedings of PRADS 2019, Yokohama, Japan, 2019.09.22-26 file 2019-09-22
84 International Conference Ki-Su Kim, Myung-Il Roh, "Optimization of the Arrangement Design of a Ship Considering the Multiple Performance", Proceedings of ACSMO 2020, Seoul, Korea, pp. 167, 2020.11.23-25 file 2020-11-24
83 International Conference Ki-Su Kim, Myung-Il Roh, Ju-Sung Kim, "A Method of Dynamic Flooding Analysis in Time Domain for the Compartment Arrangement Design of a Ship", Proceedings of ISOPE 2017, San Francisco, USA, pp. 862-866, 2017.06.25-30 file 2017-06-28
82 International Conference Ki-Su Kim, Myung-Il Roh, Seung-Ho Ham, "Ship Route Planning Considering the Effects of Sea State and the Fuel Consumption", Proceedings of PRADS 2016, Copenhagen, Denmark, 2016.09.04-09.08 file 2016-09-07
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