Control method for clam-shaped bilge keel

Abstract

The invention relates to a control method for a clam-shaped bilge keel. A main body structure of the lam-shaped bilge keel comprises two parts of a fixed clamshell structure (2) and a rotary clamshell structure (1), wherein the rotary clamshell structure (1) is connected with the fixed clamshell structure (2) through a rotating shaft system. The control method comprises the following steps of monitoring a rolling angle, an angular velocity and an angular acceleration of a ship during ship navigation; obtaining ship draft information; checking ship stability variation; if any one of the three parameters of the rolling angle, the angular velocity and the angular acceleration continuously exceeds a corresponding safety threshold upper limit within a set time, driving the rotating shaft system by using a motor so as to unfold the rotary clamshell structure of the bilge keel; and if the three parameters of the rolling angle, the angular velocity and the angular acceleration are all continuously lower than corresponding safety threshold lower limits within a set time, driving the rotating shaft system by using the motor so as to fold the rotary clamshell structure of the bilge keel. According to the invention, the opening and closing of the bilge keel can be intelligently controlled.

Description

technical field [0001] The invention relates to marine equipment for reducing rolling, in particular to a bilge keel used for anti-sinking, anti-rolling and anti-overturning of ships. Background technique [0002] The swaying motion of the ship is a harmful ship motion, which has adverse effects on the crew, hull structure, mechanical equipment, etc. Ship swaying motions include six types: roll, pitch, yaw, surge, sway and heave, among which roll has the greatest impact on ship performance, followed by pitch. In order to slow down or reduce the sway of the ship, an anti-rolling device can be added to the ship. [0003] According to the essential classification of the force constituting the stabilizing moment, the anti-rolling device can be divided into three types: gravity action type, fluid dynamic action type, and rotary force action type; according to the control form, it can be divided into passive type and active type. At present, the commonly used anti-rolling device...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bilge keel that can enhance the rolling stability without significantly affecting the speed of the ship

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