Method of breaking ice cover

FIELD: shipbuilding; submarine vessels running under ice conditions and breaking ice cover by resonance method at surfacing in compact ice.

SUBSTANCE: while breaking the ice, ship makes several lanes at area of surfacing; number of lanes is dictated by safety of surfacing. Degree of breaking the ice is determined by maximum force of thrust of propeller.

EFFECT: enhanced safety of surfacing under ice conditions.

 

The invention relates to the field of shipbuilding, in particular to underwater vessels, floating in ice conditions and destructive ice sheet resonance method, the surface covered with ice.

The prior art known from the way of the destruction of the ice cover of the resonant Flexural-gravity waves (VVM)excited by an underwater vessel (1. Vmmain, Avenida "Model studies of wave generation in a solid ice cover from the movement of the underwater vessel. - "J. Appl, Novosibirsk. - Publishing house "Science". 1994. No. 2. P.78-91), which serves to break the ice underwater vessel by excitation of Flexural-gravity waves during its movement with the resonant speed Vp, i.e. the speed at which the amplitude of exclusive breastfeeding in solid ice maximum.

The disadvantage of this method is the low safety surfacing submarine vessel destroyed in VVM ice after the passage of a vessel under solid ice with the resonant speed.

The invention consists in developing a method for determining the degree of destruction of ice cover after increasing by repeated passages of the ship under the ice.

The technical result obtained by carrying out the invention, is to improve safety surfacing submarine vessel in ice conditions.

The essential features characterizing sabreena.

Restrictive: ice destroy underwater vessel by excitation of exclusive breastfeeding during its motion.

Distinctive: in the process of ice breaking ship is engaged beneath the ice repeated passages, the number of which is determined necessary for the safe ascent of the vessel by the degree of destruction of ice, the degree of destruction is determined by the maximum force stop ship propeller.

It is known (2. Castellan VI, Poznyak I.I., Rivlin YA the resistance of the ice movement of the vessel. - Leningrad: Sudostroenie, 1968 - 240 C.)that repeated passages of the ship through a field of broken ice increase the degree of its destruction (reduce the size of the fragments of ice). This reduces ice resistance, and the maximum transverse dimensions of the ice does not exceed 3-5 ice thickness, i.e. the broken ice turns into melkovaty, which ceases to have a significant resistance to movement of the vessel. It is obvious that similar processes, i.e. grinding fragments of ice, will accompany and repeated passages of the underwater vessel under ice cover, destroyed resonance VVM from the first pass.

It is also known (3. Chasin DOUGLAS Dynamics of the ice cover. - L.: Gidrometeoizdat, 1967. - 272 S.)that VVM in the destruction of the ice are transformed into gravitational, i.e. the broken ice ceases to affect the speed and frequency of waves. When the wavelength decreases, and the amplitude is increased.

It is known that 4. Voitkunskii YA resistance to the movement of ships. Leningrad: Sudostroenie, 1988, s.), when the speed of the vessel, the corresponding maximum amplitude im gravitational waves, water resistance reaches a maximum value. For movement with such speed requires a corresponding increase in the emphasis of the propeller. Thus, the strength of the stop screw is possible to estimate the intensity (amplitude) of gravitational waves and, accordingly, the degree of destruction of the ice cover.

The method is as follows.

Under ice cover at a safe depth, i.e. in the immediate vicinity of the bottom surface of the ice begins to move underwater vessel with the resonant speed. If the degree of destruction (the sizes of fragments) of ice from the excited resonance VVM is insufficient for safe ascent (floe sizes will be too large) underwater vessel in the area of the ice works, i.e. when afloat ship krupnomery ice may cause damage to the structural elements of the vessel, the vessel makes repeated passes beneath the ice in place of the proposed surfacing (safe floe sizes determined by preliminary calculations of the strength of the vessel during its ascent in broken ice). The dimensions of the fragments of ice can be defined using the marine Ave is hog radar. The speed of the vessel during repeated passages must be equal to the., i.e. corresponding to the maximum wave resistance. Its value can be determined using hydrostatic pressure sensors located in the upper part of the vessel in the spot most likely location of the peaks of the VVM (maximum pressure value will correspond to the maximum resistance of the vessel, i.e. the maximum amplitude of the waves in broken ice). Large curvature of the profile of gravitational waves in comparison with the curvature of the VVM will cause the fragments of ice large Flexural stresses that will lead to their disintegration, i.e. increasing the degree of destruction of ice, the wave amplitude and increased emphasis ship propeller. To measure the amount of pre-emphasis in the thrust bearing shaft screw set wormer. With increasing evidence paramera after each passage will indicate that after the next passage of the vessel, the degree of destruction of ice has increased. The compliance value of the stop screw size fragments of ice is set by pre-calibration of the passages of the vessel under the fields of broken ice varying degrees of destruction. Repeated passes under the ice in the area of the ice-breaking activities (place of ascent) to carry until will not be provided with safety surfacing, i.e. the sizes of fragments lane will have a dangerous impact on the structural elements of the vessel during its ascent, but the power of focus reaches the maximum value. After each pass to determine the degree of destruction of ice.

If after the next passage of the vessel was not increasing the stop screw, it means that the degree of destruction of ice has reached the maximum value (the size of the fragments of ice steel minimum). After this the ship stops repeated passages and emerges in a field maltobiose ice.

Method of destruction of ice cover underwater vessel by excitation in ice resonant Flexural-gravity waves in its motion, characterized in that the process of destruction of the ship is engaged beneath the ice in place surfacing repeated passages, the number of which is determined necessary for the safe ascent of the vessel by the degree of destruction of ice, the degree of destruction is determined by the maximum force stop ship propeller.



 

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FIELD: shipbuilding; submarine vessels running under ice conditions and breaking ice cover by resonance method at surfacing in compact ice.

SUBSTANCE: while breaking the ice, ship makes several lanes at area of surfacing; number of lanes is dictated by safety of surfacing. Degree of breaking the ice is determined by maximum force of thrust of propeller.

EFFECT: enhanced safety of surfacing under ice conditions.

FIELD: shipbuilding; amphibian hovercraft breaking ice cover by resonance method.

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EFFECT: enhanced efficiency of ice breaking.

FIELD: shipbuilding; amphibian hovercraft breaking ice by resonance method.

SUBSTANCE: proposed device includes hovercraft with electro-hydraulic water-jet propeller mounted in its hull and used for forming hydraulic impact under crest of flexural gravitational wave when ship is running at resonance speed along edge of ice cover.

EFFECT: enhanced efficiency of breaking ice cover.

FIELD: shipbuilding; amphibian hovercraft breaking ice cover by resonance method.

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EFFECT: enhanced efficiency of ice breaking.

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EFFECT: enhanced efficiency of breaking ice cover.

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FIELD: shipbuilding; submarine ships breaking ice cover by resonance flexural gravitational waves.

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EFFECT: enhanced efficiency of breaking ice cover.

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EFFECT: enhanced efficiency of breaking ice cover.

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