Method of ice cover destruction

FIELD: agriculture.

SUBSTANCE: invention relates to ice technology, in particular, to performing icebreaking works with air-cushion ships. During the low tide the air-cushion ship moves with the resonance speed along the shoreline at a distance from the edge of the cadder and excites the resonant flexural-gravity waves in the ice, at that the transverse periodic motion is transmitted to the ship, with an amplitude not exceeding the half of the wavelength of the static deflection of ice, and the frequency equal to the frequency of resonant flexural-gravity waves.

EFFECT: increase of the efficiency of ice cover destruction.

2 dwg

 

The invention relates to the field of hladotehnika and can be used, and particularly, to provide the assistance work boat air-cushion vehicle (hovercraft), breaking ice sheet resonance method (1. Kozin V.M. Resonance method of destruction of ice cover. Inventions and experiments. M.: Publishing house "Academy of Science", 2007. - 355 S.).

Known technical solution (2. EN S, 05.10.2000), which proposes to destroy the ice cover during the sea tide SVP, moving it along the shoreline at a distance from the edge primarschule ice, equal to the half-length of a wave of static deflection of the ice cover, then with the resonant velocity along the free edges.

The disadvantage of this method is limited ice destruction capability.

The invention is aimed at improving its effectiveness.

The technical problem is solved by excitation in ice resonant Flexural-gravity waves (VVM) while driving a hovercraft with the resonant speed near the coastline of the sea of the ebb at a distance from the ice edge, primarschule to the Bank, equal to the half-length of a wave of static deflection of the ice cover, while the vessel is reported lateral movement with an amplitude not exceeding the half of the wavelength of the static deflection, and with a frequency equal to the frequency of resonance of the s VVM. Lateral movement, i.e. movement broadside to the shore, and from him, and the accompanying roll will bring additional system resonance VVM. These waves approaching the shore, i.e. when entering pronounced shallow water, will be transformed: wavelength will decrease and the wave height to increase. As a result, the imposition of this wave system to a system of exclusive breastfeeding from translational motion SVP along the coastline will increase the total height of the VVM, which will increase their ice destruction ability. Periodic movement of the vessel with an amplitude not exceeding the half of the wavelength of the static deflection, i.e. within the bowl of a wave of static deflection of the ice cover on the weight of the hovercraft and will facilitate the generation of more intensive VVM, as the offset from the sole to the top of the wave will be accompanied by the appearance of the vessel alternating maximum roll. As you know (3. Benoit YOU and other fundamentals of theory of the hovercraft. - Leningrad: Sudostroenie, 1970. - 456 C.)that the appearance of the vessel pitch leads to an increase in wave resistance, i.e. the increase of the amplitude of the excited waves. It is obvious that a similar phenomenon will occur, and if the ship roll during its movement lag, i.e. the Board. Thus the above maneuvering SVP will increase l is dresrorasaw capability.

The invention consists in increasing the height of the total Flexural-gravity waves.

The essential features characterizing the invention.

Restrictive: the way of the destruction of the ice cover of a hovercraft by excitation in ice resonant Flexural-gravity waves during its movement with the resonant speed near the coastline of the sea of the ebb at a distance from the edge primarschule to the sea, is equal to the half-length of a wave of static deflection of the ice cover.

Distinctive: simultaneously with the forward movement of the vessel reported periodic transverse displacement with an amplitude not exceeding the half of the wavelength of the static deflection of the ice, and the frequency equal to the resonant frequency of exclusive breastfeeding.

The invention is carried out as follows.

Ice cover during low tide along the shoreline at a distance from the ice edge, primarschule to the Bank, equal to the half-length of a wave of static deflection of ice

λwith at=2π4Dρg

(where D is the cylindrical rigidity of the ice plate, ρ is water density, g is the acceleration of gravity) (4. Chasin DOUGLAS Dynamics of the ice cover. - L.: Gidrometeoizdat, 1967), begin to move SVP with the resonant speed. If ice breaking will not occur simultaneously with the forward movement of the vessel reported periodic transverse displacement with an amplitude not exceeding the half of the wavelength of the static deflection of the ice, and the frequency equal to the resonant frequency of exclusive breastfeeding

ωp=1π2[ρing5D]1/8[4].

This will lead to additional excitation of the resonant system of exclusive breastfeeding, which will increase ice destruction ability SVP.

The invention is illustrated by drawings, where Fig. 1 shows a diagram of the deformation of the ice cover during forward movement of the SVP, and figure 2 - when the forward and lateral movements of the vessel.

Across frozen 1 move SVP 2 at a distance from the ice edge 3, is equal to the half wavelength of the static deflection of the ice 4, informing him at the same time periodic transverse displacement ±S (figure 1), which will cause the appearance of the vessel alternating maximum roll ±Θmax(figure 2)that will result in a corresponding increase in the thickness of the erodible LDA.

Method of destruction of ice cover a hovercraft by excitation in ice resonant Flexural-gravity waves during its movement with the resonant speed near the coastline of the sea of the ebb at a distance from the edge primarschule to the sea, is equal to the half-length of a wave of static deflection of the ice cover, characterized in that simultaneously with the forward movement of the vessel reported periodic transverse displacement with an amplitude not exceeding the half of the wavelength of the static deflection of the ice, and the frequency equal to the resonant frequency Flexural-gravity waves.



 

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