The report describes the second and final phase of a joint research project between Canada and Finland. The objective of the work was to experimentally investigate the mechanics of a ship ramming a massive ice floe. In the first phase, models of the vessel M. V. Arctic were tested and compared with full scale data. While the model/full scale agreement was encouraging, concern was raised about the influence of ship size, bow form, ice strength scaling and other parameters on the ramming forces and ship hull response. In the second phase, described herein, these questions were addressed by testing a very large model and a model of the MV Canmar Kigoriak. Both models consisted of multiple segments connected to a flexible backbone. Ramming forces and vessel dynamic response were measured. Altogether 107 tests were conducted with these models. The results of the tests are presented in the report. The main result of the project is the understanding of the ramming process and the ways in which the ship and ice parameters influence the vessel response. The main engineering concern is the maximum bending moment that may occur in the hull girder. It is shown that two separate processes take place during ramming. These can be called initial impact, which dynamically excites the hull bending, and beaching, which only statically loads the hull. There are cases in which only quasi-static beaching is important, especially for a large ship striking a square ice edge. (Copyright (c) Valtion teknillinen tutkimuskeskus (VTT) 1991.)
Parametric Model Study of Ships Ramming Multi-Year Ice Floes. Physical Modelling of Ship/Ice Interaction. Report 2
1991
63 pages
Report
No indication
English
Ship Ramming Multi-Year Ice Floes: Model Test Results
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