RU2249529C1 - Ship's fore extremity - Google Patents

Abstract

FIELD: shipbuilding; designing fore portion of ship's hull with sonar antenna dome.

SUBSTANCE: ship's fore extremity includes inclined stem with V-shaped frames in the vicinity of design waterline, recess and section of bottom projecting downward; fore point of this bottom is located at level lying in lower half of draft. Frames are inclined towards CL at acute angle in the area of fore portion of projecting part of bottom. Tapering of waterlines near aft portion of section of bottom (dome) projecting downward ensures smooth curve of cross-sectional area near its aft portion; length of section of bottom (dome) projecting downward ranges from 0.1 to 0.2 of hull length over design waterline and ratio of projecting section of bottom (dome) to hull breadth on design waterline ranges from 0.25 to 0.4. Depth of lower point of projecting section of bottom (dome) exceeds hull draft amidships by 0.9 to 1.2 times; deadrise angle of projecting section of bottom (dome) is equal to 29° at lower point and cross-section of projecting portion of bottom (dome) is between stations 1 and 2.

EFFECT: improved seaworthiness and running characteristics of ship.

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Description

The invention relates to shipbuilding and for the design of the bow of the ship with fairing GAS.

Known bow tip of the vessel, RF patent RU 2061617 C1, with a bulbous fairing having a keeled bottom and located aft from the bow perpendicular.

The bow tip of the vessel is also known according to the copyright certificate SU 1235788 A1, containing an inclined stem with a V-shaped frames in the area of the cargo waterline, a recess and a bulb - adopted as a prototype.

However, such vessels have insufficient navigation and seaworthiness for the ship. In addition, their bulbs are unsuitable for placement of GAS antennas in them.

The aim of the invention is the development of the bow of the ship with a fairing antenna GAS, providing the required navigation and seaworthiness.

The technical result of the implementation of the present invention is to increase the sea and seaworthiness of a ship equipped with a GAS.

This technical result is achieved by the fact that the fore end of the ship contains an inclined stem with a V-shape of frames in the area of the waterline, a recess and a protruding section of the bottom, the nose of which is located at a level that is in the range of the lower half of the draft, the frames in the area of the nose of the protruding downward sections of the bottom are inclined to the diametrical plane at an acute angle, the sharpening of waterlines near the aft of the downwardly extending section of the bottom ensures a smooth drill on frames near the named section, its length is from 0.1 to 0.2 of the length of the hull along the waterline, and the ratio of the width of the protruding downward section of the bottom to the width of the body along the waterline lies in the range from 0.25 to 0.4 and the depth of the lower point of the fairing exceeds the draft the hull in the midship is 0.9-1.2 times, at the same time, the pitching angle of the fairing at the lower point is 29 °, and the cross section of the bottom section of the bottom section of the maximum area is between 1 and 2 theoretical hull frames.

The invention is illustrated by drawings, where:

figure 1 the dotted line shows the frames of the prototype, and the solid lines of the frames - the body according to the invention, the Arabic numerals are the numbers of theoretical frames;

figure 2 dotted line shows the position of the bulb along the length of the prototype, and the solid line is the housing according to the invention.

The dimensions, shape and position of the cowl on the body provide favorable wave interference between the cowl and the body, which leads to a slight increase in the hydrodynamic resistance of the body at short and medium strokes and a slight decrease in the hydrodynamic resistance of the body at full speed.

The pitching of the fairing and its size in height are chosen so as to prevent its exposure and slimming on the specification wave and to minimize the dynamic loads transmitted to the body at the maximum wave.

The deepening of the protruding downward section of the bottom allows the ship to be used in ice conditions.

Claims (1)

The bow of the ship, containing an inclined stem with a V-shaped frame in the area of the design waterline, a recess and a bottom section of the bottom, the bow point of which is located in the lower half of the draft, the frames in the area of the bow of the bottom section of the bottom are inclined to a diametrical plane at an acute angle, characterized in that the sharpening of the waterlines near the stern of the protruding downward portion of the bottom (fairing) ensures smooth drill-down along the frames near its aft, the length of the protruding downward portion of the bottom (fairing) is 0.1-0.2 of the length of the hull along the structural waterline, and the ratio of the width of the protruding downward section of the bottom (fairing) to the width of the hull along the constructive waterline is within 0 , 25-0.4 and deepening the lower point of the bottom section of the bottom (fairing) exceeds the draft of the hull mid-section by 0.9-1.2 times, while the pitching angle of the bottom section of the bottom (fairing) at the bottom point is 29 °, and the section of the protruding section down Nishcha (radome) maximum area is between 1 and 2 theoretical frames of the housing.

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