Study of Influence of The Submarine Vess el’s Form on The Effectiv eness of The Ice Cover Failure by Flexural-Gravi ty Waves

V. L. Zemlyak, A. V. Pogorelova, V. M. Kozin, N. O. Baurin

The paper is devoted to the experimental and theoretical research of the influence of peculiarities of the form of a submarine vessel (depending on its lengthening and displacement) on the efficiency of breaking ice cover by flexuralgravity waves. The experiments were carried out in a natural fresh-water pond with the following parameters L×B×H = 10×3×1 m using model underwater vessels (a scale of 1:100). The model ice cover of necessary thickness was prepared by natural freezing. The necessary equipment was designed and made for the experiments to be carried out and a measuring complex for registration of deflections of model ice was formed. By towing the model SV its velocity was determined and the profiles of deflections in the ice cover were registered. In the course of experiments the curve caused by flexural-gravity waves was studied, namely the attitude of deflection to the lengths and amplitudes and the possibility of complete destruction of the ice plate. In the theoretical part of the work previously received analytical integral dependence is referred to, to calculate the deflection of the floating plate with rectilinear unsteady motion of a slender and almost axisymmetric body near the water surface. The authenticity of calculations is proved by the comparison of the results with experiments data of ice breaking by flexural-gravity waves. The results show that wave formation in the ice cover and the efficiency of its destruction essentially depend on relative lengthening and displacement of an underwater body as well as on the speed of its motion and the depth of its immersion.

Download original text