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Penetration Distance of Icebreaker “Shirase” During Her Antarctic Voyage and the Calculation of Ship Ramming in Heavy Ice Condition

Author(s): Junji Sawamura; Hajime Yamaguchi; Shuki Ushio; Shigeya Mizuno

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Abstract: The understanding of ramming performance of an icebreaker is important for a safe and efficient navigation when the icebreaker encounters heavy ice conditions such as ridge ice and multi–year ice. Antarctic research icebreaker Shirase II is often compelled to a ramming icebreaking during her Antarctic voyage. The ramming performance strongly influences on the schedule of her voyage. The icebreaking in heavy ice condition, however, has not been understood yet. This paper analyzes the ship ramming (penetration distance and ship motions) when the Japanese icebreaker Shirase II rams into multi-year ice. The relation between the ice thickness, penetration distance and ship motions are shown. The calculation method based on energy conservation is proposed to predict the penetration distance. The results compared with the penetration distance of icebreaker Shirase II.

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Year: 2020

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