Theory of the Ship and Construction Mechanics      

DOI: https://dx.doi.org/10.24866/2227-6858/2019-2-3

Kozin V.

VICTOR KOZIN, Doctor of Engineering Sciences, Professor, Department of Shipbuilding,
Chief Researcher of the Laboratory for Problems of Creation and Processing of Materials and Products, e-mail: kozinvictor@rambler.ru
Institute of Machine Science and Metallurgy, FEB RAS
1, Metallurgov St., Komsomolsk-on-Amur, Russia, 681005

Methods for determining the critical speeds of loads moving under the conditions of solid ice cover (review)

Abstract: Generation of bending waves in a floating ice plate by loads that move with critical (resonant) speeds, i.e. when their speeds coincide with the lowest phase velocities of bending waves and the concurrent gravitational waves, are accompanied by a sharp increase in their height. This allows you to significantly reduce energy consumption when breaking ice when compared with known tools and technologies. For this purpose, the wave method of breaking the ice cover was developed and tested in practice, i.e. by generating bending waves in the ice, which can be carried out by any transport that can move at the required speed and excite the EW required for the destruction of ice height. An amphibious hovercraft is the most suitable for the implementation of the wave method of breaking the ice cover. In addition, we have recently explored the possibility of using underwater vessels in the Arctic to solve transport problems. Obviously, this will require ensuring the safety of the subglacial navigation of vessels, i.e. the possibility of emergency ascent of vessels from under the ice that may arise during the operation of vessels. Usually, a ship would be trimmed by the stern and then fixed to the ice. After pumping the ballast, which is taken onto the ship for its immersion, the ice sheet collapses and the ship floats up in broken ice. The thickness of the ice is not significant, and the ship itself often receives ice damage. To eliminate these disadvantages, the developed wave method of breaking ice can also be used.

The paper presents the technologies and devices developed by the author of the article, with the help of which in real conditions it is possible to determine the critical speed in the implementation of the wave method by hovercraft and underwater ships.

Keywords: hovercraft, underwater ship, ice cover, bending wave, destruction, critical speed, wave mode.

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