A design method of anti-sway bilge keel

Abstract

The invention discloses an anti-rolling bilge keel design method. The method comprises the steps that the length of a bilge keel and the arrangement range of the bilge keel in the ship length direction are determined; the mounting point and the shape maximum allowable width of the bilge keel are determined; a hull surface flow line which passes through the mounting point at the maximum transversesection and is located within the bilge keel arrangement range is determined to serve as a mounting line; hull transverse section lines of the multiple positions are cut out, the shape maximum allowable widths of all positions of the bilge keel are determined, and a shape maximum allowable width limit line of the bilge keel is drawn; the bilge keel structure maximum width is determined, and a structure maximum width limit line of the bilge keel is drawn; the parts, with the smaller width, of the shape maximum allowable width limit line and the structure maximum width limit line are selected for splicing, width gradient lines of the head end and the tail end of the bilge keel are designed, and a final bilge keel width limit line is obtained; structural design of the bilge keel is carried out. Accordingly, compared with a traditional method, the designed anti-rolling bilge keel has lager width, area and rolling damping.

Description

technical field [0001] The invention relates to the technical field of bilge keels, in particular to a method for designing a roll-stabilizing bilge keel. Background technique [0002] The bilge keel is a simple and effective anti-rolling device commonly used on ships, and its drag reduction effect mainly comes from the increase of roll damping. The length of the bilge keel has a certain effective range. Generally, the smaller the square coefficient of the ship, the smaller the effective length of the bilge keel. When the length of the bilge keel is determined, for safety reasons, the ship design community also requires that the width of the bilge keel should not exceed the bounding box of the maximum cross section. In this context, for a long time, the industry has formed a conventional method for designing the shape of the bilge keel, that is, firstly determine the effective length of the bilge keel according to the ship type, and then determine the effective length of th...

AI Technical Summary

Problems solved by technology

Although the bilge keel designed according to this method has a regular shape and is easy to process, its anti-rolling effect often cannot meet the overall design requirements of the ship, especially for ships with small square coefficients and ships with high requirements for rolling motion. It is necessary to install other types of anti-rolling devices, such as anti-rolling water tanks, passive or active anti-rolling fins, etc., which will not only increase the cost of ship design and construction, but also significantly increase the space and weight of the equipment on board

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