Stability assessment for intact ships in the light of model experiments |
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| Authors: | Naoya Umeda Akihiko Matsuda Masami Hamamoto Shiro Suzuki |
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| Institution: | (1) Department of Naval Architecture and Ocean Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan, JP;(2) National Research Institute of Fisheries Engineering, Ibaraki, Japan, JP |
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| Abstract: | A systematic method for assessing intact ship stability with a free-running model in a seakeeping and maneuvering basin is
proposed in this paper. Model experiments were carried out in extremely steep regular waves for a model drifting, running
in head seas, and quartering seas. This method was applied to two purse seiners, and efficiently identified thresholds in
metacentric heights for capsizing of these ships. These capsizing thresholds are compared with requirements of the IMO Code
on Intact Stability. This series of model experiments also confirms that capsizing at the threshold occurs only in quartering
seas, and shows that capsizing is caused by broaching, loss of stability on a wave crest, or bow diving.
Received for publication on Jan. 20, 1999; accepted on July 6, 1999 |
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| Keywords: | : capsizing broaching stability loss bow diving following seas quartering seas |
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