Presented are the results of an experimentally based study aimed at determining the relationships between resistance, icebreaking pattern and hull motions for a POLAR-Class hull during continuous-mode icebreaking of monolithic ice sheets. The study involved two sets of experiments conducted with a 1:48-scale model hull towed at a range of steady speeds through sheets of urea ice grown on an ice tank. For one set, the hull was free to pitch, heave and undergo limited roll. The other was conducted with the hull fixed from motion. It was found that the free hull experienced larger values of mean resistance than did the fixed hull. The difference is attributed to the influences of hull motions. A relationship is shown between dominant cycles of resistance experienced by the hull, its pitch and heave motions, and the icebreaking pattern that it created. The dominant frequency of ice resistance and hull motions experienced by the free hull occurred either at integer fractions of icebreaking frequency, or at the hull's natural frequency of coupled pitch and heave.
Dynamics of Continuous-Mode Icebreaking by a POLAR-Class Icebreaker Hull
1987
187 pages
Report
No indication
English
Auxiliary icebreaking system suitable for polar icebreaker
European Patent Office | 2023
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