Ice going ships: speed vs ice load

• Published in: Transactions of the Krylov State Research Centre
• Main Authors: Аnatoly V. Аleksandrov, Victor V. Platonov, Valery M. Shaposhnikov
• Format: Article in Journal/Newspaper
• Language: English; Russian
• Published: Krylov State Research Centre 2019
• Subjects: class requirements; ice loads; ship speed; strength; Naval architecture. Shipbuilding. Marine engineering; VM1-989; Arctic; Icebreaker
• Online Access: https://doi.org/10.24937/2542-2324-2019-2-388-69-76; https://doaj.org/article/2cf62807b270423893fb75e06b5d18d7

Object and purpose of research. This paper studies how local ice loads of ice going ships depend on their speed. Materials and methods. Scientific and methodical basis of valid RS Rules and IACS Unified Requirements for Polar Class Ships in terms of design ice load assignment, as well as model test data on local ice loads for an advanced icebreaker. Main results. This paper analyses scientific and methodical basis of valid RS Rules and IACS Unified Requirements for Polar Class Ships in terms of design ice load assignment, as well as suggests an assessment method for broken-ice operation capability (in terms of hull strength) based on statistical energy analysis. Conclusion. It is shown that, according to valid RS and IACS rules, the speed of ice-class ships has considerable effect upon their ice loads. The transition to ice load assignment based on the new model of dynamic ice failure will reduce this speed effect, thus ensuring development of large Arctic ships with high efficiency. Computer-based simulation of ice straining performed to extrapolate model pressure data to the full scale makes ice tests more informative in terms of local ice pressures, which could enable refinement of ice load calculation methods. Statistical-energy approach discussed in this paper as a good way to assess broken-ice operation capability of ice-class ships may be successfully applied to the ships without ice class as well.