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http://dx.doi.org/10.7837/kosomes.2016.22.6.654

An Experimental Study on Loll  

You, Su-Yeon (Graduate school of Mokpo National Maritime University)
Pag, Chong-Lyong (Graduate school of Mokpo National Maritime University)
Jung, Dae-Deug (Division of Navigation Science, Mokpo National Maritime University)
Publication Information
Journal of the Korean Society of Marine Environment & Safety / v.22, no.6, 2016 , pp. 654-659 More about this Journal
Abstract
Recently, the passenger ship 'Sewol' capsized with an abrupt inclination while she was making a small angle alteration. It is very important to fully understand the concepts, causes and relevant corrections for a ship's transverse inclination, which is classified into heel, list and loll. In this study, the concept, development and calculation of loll were well considered and the actual magnitude of the angle of loll was simulated in a box-shaped model-ship experiment. The experimental values and its development according to different values of negative stability were compared with calculated values. In the results, experimental values for the angle of loll coincided closely with calculated values and the model inclined symmetrically on both port and starboard sides indicating an outstanding feature of loll. This study is expected to expand the concept of loll and help in the analysis of capsize incidents with unknown causes. Further experimental research or case studies concerning the risk of inappropriate correction for loll arising from misunderstandings will be needed.
Keywords
Loll; Angle of loll; Negative stability; Negative GM; Metacenter; Inclining test; Transverse inclination;
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