Method of ice cover destruction

FIELD: transport engineering.

SUBSTANCE: method is implemented by creation ship trim by the stern, and buoyancy force due to drainage of the ballast tanks. At that the ship is provided with additional buoyancy force that is periodically changed with frequency equal to natural frequency of the resonance bending-gravitational waves generated in ice cover by pulse load.

EFFECT: increased efficiency of ice destruction by submarine.

4 dwg

 

The invention relates to shipbuilding, in particular to underwater vessels, destroying the ice when surfacing through the ice loading from below by creating buoyancy forces.

Known technical solution (1. Carlin S. L. security Concept ice sailing // Technical report. FSUE CDB ME "RUBIN" BLITZ. 11.55-07, 2007. 57), which is supposed to break solid ice body through the creation of trim by the stern and draining ballast tanks of a vessel.

The disadvantage of the solution is the limited thickness of the destroyed ice, defined by the reserve buoyancy of the underwater vessel, i.e. the volume of the ballast tanks.

The essence of the invention is to provide a method of increasing the load on the ice at the bottom due to the creation of the vessel additional buoyancy forces and ensure the periodicity of its impact.

The technical result obtained by carrying out the invention, is to increase the efficiency of destruction of ice underwater vessel.

The essential features characterizing the invention

Restrictive: method of destruction of ice cover underwater vessel through the creation of the vessel trim by the stern and buoyancy forces due to the draining of the ballast tanks.

Distinctive: the vessel creates an additional force of buoyancy, which periodically change�Ute with a frequency equal to the natural frequency of the resonant Flexural-gravity waves excited in the ice cover of the pulsed load.

It is known (2. Kozin V. M. Schipachev Vladimir Fluctuations of the ice cover under the action of periodically varying load. / Journal of applied mechanics and technical physics. - Novosibirsk: Publishing house of SB RAS. - 1992. No. 5) that the periodic application to ice sheet transverse load with a frequency equal to the natural frequency of the excited Flexural-gravity waves (VVM), leads to a significant increase of deformation (amplitude deflections) compared to its static application.

The invention is as follows.

When the need arises ascent into solid ice the ship without a course pregnaut with trim by the stern and begin to blow the ballast tanks. If their volume, i.e. the margin of buoyancy is insufficient for the destruction of the ice cover of the upper deck forward end, the vessel creates an additional force of buoyancy, for example, by supplying compressed air under pre-installed on the sides at the bow end and hermetically attached to a light elastic body (rubber) plate. This will lead to the appearance of the outside of the hull of vessels, i.e. additional buoyancy forces. It is necessary to C�ntry the size of these tanks were located above the center of gravity of the vessel. This will increase both the transverse and longitudinal stability of a vessel. If this is not sufficient for the destruction of the ice cover, these tanks begin to periodically ventilate and fill with compressed air with a frequency equal to the natural frequency of the VVM [2], leading to the generation of resonant VVM, i.e., increase the amplitude of the deflection, and hence the bending stresses in the ice. As a result achieved the claimed technical result.

The invention is illustrated graphically, where Fig. 1 shows a side view of the vessel when afloat in a known manner; Fig. 2 - cross section along A-A in Fig. 1; Fig. 3 - side view of the vessel when afloat by the proposed method; Fig. 4 - section along b-b In Fig. 3.

The vessel 1 with the trim by the stern φ pregnaut the ice cover 2 and begin to blow ballast tanks (not shown). If their volume is insufficient for destruction of ice cover 2 upper durable deck 3 at the expense of buoyancy forces γVb(where γ is the specific weight of water, Vb- volume ballast tanks) (see Fig. 1, 2, 4), i.e. the static waves of expansion 5 (Fig. 1-4), the vessel creates an additional force of buoyancy 2γVe(where Ve- the volume emerged containers 4) by filing them in compressed air through the holes 6 (Fig. 2, 4). This will lead to an increase in the wave of expansion to deformations in the ice 7 (Fig. 3, 4). D�I further increase in the deformation of ice, i.e. for excitation of the resonance 8 VVM, volume of containers 4 are beginning to change with a resonant frequency of the VVM (Fig. 3, 4).

Method of destruction of ice cover underwater vessel through the creation of the vessel trim by the stern and buoyancy forces due to the draining of the ballast tanks, characterized in that the vessel creates an additional force of buoyancy, which periodically change with a frequency equal to the natural frequency of the resonant Flexural-gravity waves excited in the ice cover of the pulsed load.



 

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