The bow impact load is important for design ice load parameter estimation, and hence for the scantling calculation in Polar ship design and safe speed methodology. In the Polar Rules, the effective bow impact load is the minimum ice failure load from the crushing failure model and flexural failure model. The Polar Rules ice crushing failure model is reasonably good for estimating the ice crushing load and to account for the ship speed effect. However, the flexural failure load in the Polar model is insensitive to the ship speed. In this study, a speed dependent ice flexural failure model developed by Sazidy et al. [1] is adopted to investigate the ship speed effect on the bow impact load. The study indicates that the Polar Rules based bow impact load estimation method is reasonable for thicker ice operation, slow speed interaction or for ships with lower displacement, as ice crushing represents their limiting ice failure condition. For thinner ice at medium to higher interaction speeds or the ship with higher displacements, the flexural failure model provides the limiting bow impact load, and hence the Polar Rules based method may not be appropriate for these interaction scenarios as their flexural failure model is insensitive to ship speed.
Effect of Ship Speed on Bow Impact Load Estimation for Polar Class Ship Design
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-04
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
SHIP LOAD OBSERVATION APPARATUS, SHIP LOAD OBSERVATION METHOD, AND SHIP LOAD OBSERVATION PROGRAM
Europäisches Patentamt | 2018
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