Method of destruction of ice cover

 

(57) Abstract:

The invention relates to means for navigation in freezing pools. The method consists in the excitation of the ice sheet a hovercraft resonant Flexural-gravity waves, then with a frequency equal to the frequency of these waves, the speed reduction with a simultaneous decrease in pressure in the air cushion to atmospheric at the time of the sinking of the ship on the bottom of the wave, then increase speed to value, when the ship will receive the maximum pitch to the stern with simultaneous increase of pressure in the air cushion to the maximum possible. The invention is directed to improving the efficiency of destruction of ice.

The invention relates to the field of shipbuilding, in particular to the courts air-cushion vehicle (hovercraft), breaking ice sheet resonance method, i.e., by excitation of resonant Flexural-gravity waves (VVM) (1. Kozin C. M. Resonance method of destruction of ice cover. The dissertation on competition of a scientific degree of the doctor of technical Sciences in the form of a scientific report. - Vladivostok, IAP, 1993).

There is a method of destruction of the ice cover, in which the ship is engaged rotational to Torah air cushion to increase the amplitude of the VVM (2. RF patent 2057048 from 27.03.96).

The disadvantage of this method is the necessity of the vessel expensive equipment, appropriate computer technology and specialized software for the preliminary calculation of the resonant frequency.

The invention consists in developing a more simple way to increase the amplitude of the VVM.

The technical result obtained by carrying out the invention, is to increase the efficiency of destruction of ice SVP resonant way.

The essential features characterizing the invention.

Restrictive: the ice cover breaks a hovercraft by excitation in ice resonant Flexural-gravity waves.

Distinctive: after excitation of resonant Flexural-gravity waves the speed of the vessel periodically with a frequency equal to the resonant frequency Flexural-gravity waves, first reduce, while simultaneously reducing the pressure in the air cushion to atmospheric at the time of the sinking of the ship on the bottom of the wave, and then increased to values when the ship will receive the maximum pitch to the stern, while increasing the pressure in the air the ear cushion for the destruction of the ice cover. Vladivostok: Publishing house of the FENU, 1988. 128 C. ), which increases the speed of SVP and u bring it to resonance upthe profile curvature of exclusive breastfeeding increases and reaches a maximum value at u= up. The ship gets the maximum pitch to the stern , because it will be at the point of inflection of the profile of the VVM. If the speed of the vessel to be reduced a little before sliding it on the bottom of the wave and at the same time to reduce the pressure in the air cushion to atmospheric after the complete lowering of the vessel on the ice, the ship will hit the body of ice, which will cause additional deformation (increase of deflections) of ice. If then the speed of the ship again be increased to the amount at which it will reach the point of inflection of the profile of the VVM, it again will get the maximum pitch to the stern . Concurrent with this increase in pressure in the air cushion to the maximum possible value will result in lifting the ship up with some acceleration and that, in turn, will lead to additional vertical component of the pressure force on the ice, equal to mA (where m is the mass of the ship). These exercises (decrease and a subsequent increase in the speed of the vessel with a simultaneous decrease and increase of pressure in the air cushion, the court is to sbordoni additional resonance VVM, i.e. additional pumping energy in VVM, excited when forward movement of the SVP, and increase the total amplitude of the waves.

The method is as follows. Boat launch on the ice and start moving across frozen with gradually increasing from zero speed u. As the SVP in ice cover will arise and begin to develop VVM. When u=upthe curvature profile of the VVM reaches the maximum value, and the vessel shall receive the maximum pitch to the stern . Then the vessel is transferred to the braking mode and reduce speed to such size that the ship sank to the bottom of the wave. At the same time by turning off the fan complex lower the pressure in the air cushion to atmospheric to ensure hitting the hull on the ice at the time of finding it on the bottom of the wave. After that, the boat's speed is again increased to the amount at which the vessel will again receive the maximum pitch to the stern, and the pressure in the air cushion increase to the maximum value. Ship when it begins to "climb" on a wave with a simultaneous increase in pressure on the ice due to the purchase of the vessel vertical acceleration. Such maneuvering is repeated periodically with a frequency RiT the efficiency of destruction of ice SVP resonant way.

Method of destruction of ice cover a hovercraft by excitation in ice resonant Flexural-gravity waves, characterized in that after excitation of resonant Flexural-gravity waves the speed of the vessel periodically with a frequency equal to the resonant frequency Flexural-gravity waves, first reduce, while simultaneously reducing the pressure in the air cushion to atmospheric at the time of the sinking of the ship on the bottom of the wave, and then increased to values when the ship will receive the maximum pitch to the stern, while increasing the pressure in the air cushion to the maximum possible.

 

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