Model-scale experiments of symmetric ship collisions |
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Authors: | Kristjan Tabri Jukka Määttänen Janne Ranta |
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Institution: | (1) Ship Laboratory, Helsinki University of Technology, P.O. Box 5300, 02015 TKK Helsinki, Finland |
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Abstract: | This study was initiated due to the lack of experimental data on ship collisions. The feasibility of model-scale ship collision
experiments was examined and a series of model-scale ship collision experiments is presented. The theoretical background for
the analysis of experiments is given together with the principles of scaling. Proper scaling should assure physical similarity
to the large-scale experiments conducted in the Netherlands. The Froude scaling law was followed, resulting in the improper
scaling of some forces: the effects of this are discussed. The study concentrates on the dynamics of collisions. The structural
response, properly scaled from the large-scale experiments, was modelled using polyurethane foam as the ship’s side structure.
The collision process was analysed and the results of model-scale tests, large-scale experiments, and a simple analytical
model were compared, showing that there was both quantitative and qualitative agreement in the results of the experiments
conducted at different scales. The analytical model yielded good quantitative assessment of the deformation energy. |
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Keywords: | Model- and large-scale collision experiments Froude scaling law Physical similarity |
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