Water Entry Simulation of Free-fall Lifeboat-1-Analysis of Motion and Acceleration〔含討論〕

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Free-fall lifeboats provide a safe alternative to conventional lifeboats for emergency evacuation from ships and offshore platforms. The international regulations require that a lifeboat for free-fall launching shall be capable of rendering protection against harmful accelerations when it is launched with its full complement of persons and equipment from at least the maximum designed height. Through model and full scale tests, much has been studied about the behaviour of these lifeboats. These tests, however, are very expensive to conduct and the complete behaviour of the boat is sometimes difficult to discern. A mathematical model, therefore, can be very much effective to quantitatively evaluate the kinematics of the free-fall lifeboat. The hydrodynamic impact of the boat at water entry is a complex problem and is responsible mostly for the acceleration on board. Presented in this paper is a mathematical model where impact has been evaluated for a realistic lifeboat hull on the basis of the concept of a momentum theory, and the falling motion of the boat has been computed by solving the motion differential equations in the time domain. From the numerical simulation, trajectories of the boat and time histories of accelerations in different positions and directions are obtained. Model experiment has also been conducted to verify the numerical results and good agreement has been obtained between the numerical and experimental results.
社団法人日本船舶海洋工学会の論文

Water Entry Simulation of Free-fall Lifeboat-1-Analysis of Motion and Acceleration〔含討論〕

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Water Entry Simulation of Free-fall Lifeboat-1-Analysis of Motion and Acceleration〔含 討論〕

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Water Entry Simulation of Free-fall Lifeboat-1-Analysis of Motion and Acceleration〔含討論〕