SU409917A1 - - Google Patents

Description

one

The invention relates to shipbuilding. M is a roll system for determining the metacentric height of a ship.

Roll systems for the ship’s metacentric height are known, including side tanks, liquid transfer pumps, remote water level sensors in tanks and inclinometers.

The aim of the invention is to simplify the system by using standard ballast tanks as on-board tanks.

For this, the system is equipped with sensors of the upper and lower levels of water in the tanks, which send signals to the ballast standard pumps, which are hydraulically connected to valves that cut off a predetermined volume of water to reach the roll indicated by the inclinometer.

The peculiarity of the system is that the level alarms are reinforced on the longitudinal bulkhead of the onboard ballast tanks from the cargo hold side.

FIG. 1 given a schematic diagram of the system; in fig. 2 is a schematic representation of the cross section of the vessel; in fig. 3 - nomogram for determining the initial metacentric height.

The roll system includes a ballast pump 1, an emergency ballast pump 2, an angular non-return valve 3 for

2

Drive 4, Kingston 5, klinketny valves

6-11. The ballast is pumped by

remote controlled valves 12-16.

The system includes sensors of the upper 17 and

lower 18 levels in tanks, reinforced on a longitudinal bulkhead of onboard ballast tanks from the cargo hold.

If it is necessary to determine the initial stability, the tanks are filled up to the low level sensor 18 with the nominal ballast system.

To create heeling moment, the constant ballast from one tank from the low level sensor is pumped to another

top level sensor For this, valves 12 and 15 or 13 and 14 are opened remotely from the wheelhouse and the pump is turned on by pressing a button.

The ballast is pumped until

liquid level will not reach the upper level sensor. The pump is stopped automatically or remotely by pressing a button on the control panel. The angle of heel is determined by the cregimeter. Since the heels of the 11 moment in the proposed system are constant, specific to each ship, the initial metacentric height is calculated by the formula

Sin 8 -, D-fi where e is the angle of heel in degrees measured by the inclinometer; D is the displacement of the vessel at the time of onpej dividing the initial metacentric height; h is the initial metacentric height. The metacentric height is determined by the nomogram (Fig. 3). The magnitude of the initial metacentric height depends on the angle of heel and displacement. The constant volume of water for each vessel is determined from the condition of obtaining the pitch and the one moment tilting the vessel for any load condition at an angle of 2 ° -4 °. The subject matter of the invention 1. A roll system for determining the metacentric height of a vessel, comprising on-board tanks, pumps for pumping bone bridges, remote level indicators of water in tanks and inclinometers, characterized in that, in order to simplify the system by using as the side tanks, national ballast tanks It is equipped with sensors of the upper and lower levels of water in tanks that feed signals to the ballast standard pumps, which are hydraulically connected to valves that cut off a predetermined volume of water for reaching roll, fixed by the inclinometer. 2. The system of claim 1, wherein the level indicators are fixed on a longitudinal bulkhead of onboard ballast tanks from the cargo hold.

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