ABSTRACT

The acceleration and deceleration motion of a submarine under an ice cover is considered theoretically and experimentally. The analytical solution is obtained by using Fourier and Laplace integral transforms. The experimental part of this work is carried out in a natural fresh-water pool with using model underwater vessels (scales of 1:120 and 1:300). The maximum wave height is observed for steady motion of submarine with critical velocities. Deceleration and acceleration regimes lead to the decrease in the wave height. Theoretical and experimental data are in good agreement.

INTRODUCTION

When using submarines in the areas covered with an ice cover, the problem of fast emersion of the submarine from-under ice becomes relevant. Fast emersion from-under ice can be required or for performance of a fighting task, or for rescue of crew in case of accident. Means of a break of ice which are available on submarines today don't allow to emerge quickly enough without damage to a hull. It is obvious that if the ice cover is partially destroyed or weakened by cracks before the emersion, then the submarine will be able to overcome thick Arctic ice without damage to a hull. One of ways of destruction of an ice cover is emergence of flexural gravity waves in it during moving the submarine near an ice cover. It is known from experiments with submarine's model (Kozin and Onischuk, 1994; Kozin and Zemlyak, 2012) that there are flexural gravity waves destroying an ice cover during moving of submarine.

Recently many works devoted to various bodies submerged in liquid under a floating elastic plate, a membrane or an inertial layer (a layer of the beaten ice) with the fixed location were published: Chowdhury and Mandal, (2006), Das and Mandal (2006; 2008); Lu and Dai (2006; 2008a; 2008b). The hydrodynamic load acting on the body was calculated (Sturova, 2011) as a function of the oscillation frequency for the case of a continuous ice cover and for special cases (broken ice, free surface, and rigid lid).

This content is only available via PDF.
You do not currently have access to this content.