Numerical and experimental motion simulations of nonsymmetric ship collisions |
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Authors: | Kristjan Tabri Petri Varsta Jerzy Matusiak |
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Institution: | (1) Department of Applied Mechanics, Marine Technology, Helsinki University of Technology, P.O. Box 5300, 02015 TKK Espoo, Finland |
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Abstract: | A calculation model to simulate nonsymmetric ship collisions, implying an arbitrary impact location and collision angle, is
described in the paper. The model that is introduced is based on the time integration of twelve equations of motion, six for
each ship. The motions of the ships are linked together by a mutual contact force. The contact force is evaluated as an integral
over the surface tractions at the contact interface. The calculation model provides full time histories of the ship motions
and the acting forces. Physical understanding of the underlying phenomena was obtained by a series of model-scale experiments
in which a striking ship collided with an initially motionless struck ship. In this paper, numerical simulations of four nonsymmetric
collisions are presented and the calculations are validated with the results of the experiments. |
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