US3683837A - Anti-roll stabilizing installation for ships - Google Patents

Anti-roll stabilizing installation for ships Download PDF

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Publication number
US3683837A
US3683837A US51857A US3683837DA US3683837A US 3683837 A US3683837 A US 3683837A US 51857 A US51857 A US 51857A US 3683837D A US3683837D A US 3683837DA US 3683837 A US3683837 A US 3683837A
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United States
Prior art keywords
ship
air
tanks
tank
installation
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Expired - Lifetime
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US51857A
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English (en)
Inventor
Jean Paul Polouektoff
Jacques De Font-Reaulx
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SNOWBALL TRADING AGENCIES
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SNOWBALL TRADING AGENCIES
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/02—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses
    • B63B39/03—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by displacement of masses by transferring liquids

Definitions

  • ABSTRACT The installation is particularly useful for stabilizing ships. It comprises at least one group of two submerged tanks open to the sea, one of these tanks being provided on one side of the ship' and the other on the opposite side thereof.
  • An air compressor and a dis tributor ensure the distribution of compressed air in.
  • This installation additionally includes a device sensitive to the transverse inclination of the ship, and means for controlling the distributor actuated by the aforementioned device sensitive to the inclination of the ship.
  • This invention relates to an antiroll stabilizing installation working on compressed air intended to damp the rolling movements of a ship both during voyage and during anchorage.
  • the anti-roll stabilizing installation for ships according to the invention is distinguished by the fact that it comprises two submerged tanks open to the sea on either side of the ship which are filled by the hydrostatic submersion pressure, by the kinetic energy of motion and by the intake of air by a compressor, and emptied by the compressed-air pressure.
  • the filling and emptying of a given volume of water from the alternately functioning tanks capable of generating a correcting torque equal and opposite to the roll-producing torque with a lever arm approximately equal to the width of the ship determines the correcting movement.
  • a rotary air distributor consisting of four balanced valves actuated by a cam plate turning through approximately 80 and controlled hydraulically or pneumatically by piston rods, enables air to be distributed and to escape simultaneously by moving from a neutral position which eliminates water hammers and enables the two tanks to be simultaneously emptied as required.
  • a device sensitive to the transverse inclination of the ship comprises a float fixed to a spindle and inside a chamber filled with liquid which in turn is fixed to the ship along its transverse axis. Further means for controlling the distributor are actuated (according to the shape, inertia and velocity of the waves) by electrical signals generated by the aforementioned device sensitive to the inclination of the vessel at precise moments for changing the pumping phases.
  • FIG. 1 is a diagrammatic view of a complete anti-roll installation according to the invention.
  • FIG. 2 is a horizontal section through a submerged tank of the installation
  • FIGS. 3 and 4 are vertical sections at 90 from one v another through an air distributor
  • FIG. 5 is a section on the line A-B or the line A-B of FIGS. 3 and 4; 1
  • FIG. 6 is a section on the line CD of FIGS. 3 and 4;
  • FIG. 7 is an air-distribution diagram
  • FIGS. 8 and 9 are stabilization diagrams
  • FIG. 10 is a diagrammatic view of an anti-roll installation comprising a hydraulic roll detector according to the invention.
  • FIGS. 11 and 12 are partial sections through this detector on a larger scale and at 90 from one another.
  • the anti-roll installation according to the invention works on the principle of alternately filling and emptying two tanks C and C with a volume of water capable of generating a correcting torque equal and opposite to the roll-generating torque.
  • Water is emptied from the tanks through the compressed-air pressure.
  • the filling time (ta may well be shorter than the delivery time (tr or vice versa, although this does not in any way prevent the installation from functioning properly.
  • the present invention solves the problem as follows:
  • the two tanks communicate directly with the sea and the filling and emptying water flows through one or more common pipes l which, or each which, may have a non-retum valve. However, a valve or gate 2 is provided for closure after use.
  • each. tank a float valve 3 which rises when the tank is full, closes the air opening and prevents the water from entering the compressor.
  • This method offers several advantages: a. it saves energy during the filling and transfer of a volume of water across the ship;
  • the air distributor 5 consists of four balanced valves 5,, S for the admission of air and E and E for the escape of air (FIGS. 3 to 6).
  • the compressed air arrives through an inlet 6, fills a chamber 7 containing the valves 8, and S and flows into the chambers 8 and 9 or 10 and 11, depending upon the opening of the valves.
  • the chambers 8 and 9 are separated by a wall p and the chambers 10 and 11 by a wall p
  • the chambers 8 and 9, and the chambers 10 and 11 are arranged on either side of the chamber 7 and another chamber 12.
  • the walls p and p are in a common plane while another wall 12 separating the chambers 7 and 12 is situated in a secant plane perpendicular to the plane of the walls p and p
  • the chambers 8 and 9 communicate with one another, terminating in an opening leading to the tank C while the chambers 10 and 11 communicate with one another and terminate in an opening 0 leading to the tank C
  • the air escaping from the tanks flows into the same chambers 8 and 9 or 10 and 11 and, after the escape valves E or E present in the chamber 12 have opened, rejoin the suction pipe 14 of the compressor which opens into this chamber 12.
  • the air pressure prevails between the two valves S and S and when each valves opens there is no counter pressure from the opposite side.
  • the valve are held in position by springs 15 adjustable by a mechanism 16.
  • valves are displaced by tappets l7 and rollers 18 which roll on a plate 19 carrying earns 20.
  • the cam plate is controlled by rods 21 of cylinder assemblies 22 and by a roller lever 23 and makes a reciprocating movement through approximately 80.
  • the piston rod assemblies are controlled by compressed air or hydraulically (oil) by a reversing mechanism 25 which steers the movement.
  • the AIR valve only opens after the escape valve has completely closed, which affords the following advantages:
  • the two AIR valves open progressively passing through a fneutral position 24 as they do so (FIG. 7).
  • the neutral position of the plate can be maintained pneumatically as required by progressively closing the valve 25 until the air pressures in the two piston-and-cylinder assemblies have been balanced.
  • the neutral position enables the two tanks to be simultaneously emptied either to balance the position of the ship or to drain the two tanks on completion of pumping.
  • the changing of the pumping phases is controlled by a hydraulic detector 26 which records the deviation of rolls from the vertical.
  • This detector detects the vertical around the roll axes, controls the heel angle, the inertia and the velocity of rolls.
  • the sum total of the signals detected acts through an electromagnetic relay 28 on an inverter or on a two-way valve 28a which delivers air or oil under pressure supplied by a pump 29 into the pistonand-cylinder assemblies 22 controlling the distributor.
  • the present invention provides for the generation of a zone of repeating electrical signals between more or less 42 of roll: A,, A A B B B etc. (FIGS. 8 and 9).
  • the hydraulic roll detector (or vertical deviation indicator), FIGS. 11 and 12, consists of a horizontal float cylinder 30 fixed to a spindle 31 inside 'a chamber 32 containing a liquid (preferably oil) up to a level 33.
  • the chamber 32 is fixed to the deck in the transverse axis of the ship by means of two supports 35 adjustable by mechanism 36 so as to give a horizontal position to the chamber 32 when the ship has a zero list.
  • Bearings 34 keep the assembly in a horizontal position in the event of pitching.
  • the chamber 32 follows the movements of the ship, the liquid present in it and the float 30 remaining horizontal while an arm carrying an indicator 37, integral with the float, remains vertical.
  • the maximum deflections of the list indicator are limited to more or less 5 because the stabilizing action should begin during the first excursions from zero and should stop the roll beyond these values.
  • the float is balanced to a volume of approximately 30 liters and weighs about 15 kg. Hence its pressure is about 15 kg and its correcting moment ql is positive.
  • fins 38 level with its water line. These fins are arranged parallel to the level of the liquid.
  • the arm 37 is fixed to the float 30 above its center of gravity. This arm terminates in a toothed sector 39.
  • This toothed pinion 43 moves to the left and right on the toothed sector 39 which remains substantially fixed.
  • This movement which is proportional to the port and starboard list of the ship causes the pinion to oscillate about its axis and makes a pilot spindle 44 thereof follow the curve of a dial, causing the degree of list to be recorded and at the same time electrical contacts A A A B B B etc. to be established so as to deliver a signal through a circuit 45 towards the relay 28 which acts through the inverter 28a on the air distributor S and causes the phases to be reversed.
  • This change in the phases preferably takes place with an advance of a" or [3 relative to the vertical, the object of which is to make it easier for the tanks to be filled and emptied.
  • the contacts are fixed to removable plates 46 adjustable by screws 47.
  • a servo-pilot formed by the toothed pinion 43 is movable from left to right to actuate the contacts A A A which direct the current in the circuit 45 towards the relay 28.
  • the servo-pilot By moving from right to left, the servo-pilot passes freely across the contacts A A and A and in the positions B,, E and B similarly actuated by the contactors delivers current through the circuit 48 towards the opposite side of the relay 28 which reverses the phases and determines the duration and rate of flow of the pumped water.
  • stabilizing tanks may be provided along the ship and can be brought into operation either together or separately according to the state of the sea.
  • a gyroscope is provided to control the change in the pumping phases.
  • the installation according to the invention occupies minimum space, is light and distinguished above all by its robustness, its simplicity and its ease of operation.
  • the piston-and-cylinder assemblies are each equipped with a pneumatic shock damper comprising two air ducts 49 and 50.
  • the piston of the piston-andcylinder assembly closes the opening 49 so that the escaping air only flows through the opening 50 partially obstructed by a ball 51 which reduces shock by 90 percent in the rubber damper.
  • the ball 51 On the arrival of air, the ball 51 is lifted and enables the air to pass freely into the cylinder first through the opening 50 and then through the two openings 50 and 49.
  • an air compressor having connected air exhaust'and air intake lines
  • a distributor having means communicating air escape and air intake to said tanks whereby said distributor simultaneously ensures the distribution of compressed air intake to one of said tanks, resulting in the emptying of this tank, and the escape of air from the other said tank, resulting in the filling of this other tank through the combined action of this escaping air, the hydrostatic pressure and the kinetic energy of motion when the ship moves
  • said dis tributor including for each tank a separate double valve through which compressed air is delivered and another separate double-acting valve through which the air escapes, detector means sensitive to the transverse inclination of the ship, and means for controlling said distributor actuated by said detector means sensitive to the inclination of the ship.
  • a stabilizing installation as claimed in claim 2 including push rods acting on said cam plate so that it rotates about itself in one direction or in the opposite direction through an angle of approximately 4.
  • An anti-roll stabilizing installation for ships comprising at least one group of two submerged tanks open to the sea, one of these tanks being provided on one side of the ship and the other on the opposite side thereof, an air compressor, a distributor simultaneously ensuring the distribution of compressed air in one of said tanks, resulting in the emptying of this tank, and the escape of air from the other said tank, resulting in the filling of this other tank through the combined action of this escaping air, the hydrostatic pressure and the kinetic energy of motion when the ship moves, a device sensitive to the transverse inclination of the ship, said device sensitive to the transverse inclination of the ship including a float fixed to a spindle inside a liquid-filled chamber itself fixed to the ship along its transverse axis, and means for controlling said distributor actuated by said aforementioned device sensitive to the inclination of the ship.
  • said servo-pilot establishes electrical contacts during its .displacement so as to produce control signals.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Vibration Prevention Devices (AREA)
  • Ship Loading And Unloading (AREA)
US51857A 1969-07-15 1970-07-02 Anti-roll stabilizing installation for ships Expired - Lifetime US3683837A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6924068A FR2053697A5 (fr) 1969-07-15 1969-07-15

Publications (1)

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US3683837A true US3683837A (en) 1972-08-15

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US51857A Expired - Lifetime US3683837A (en) 1969-07-15 1970-07-02 Anti-roll stabilizing installation for ships

Country Status (6)

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US (1) US3683837A (fr)
BE (1) BE752840A (fr)
DE (1) DE2034876A1 (fr)
ES (1) ES381737A1 (fr)
FR (1) FR2053697A5 (fr)
NL (1) NL7010390A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140316620A1 (en) * 2011-09-16 2014-10-23 Q-Tagg R&D Ab Method and device for averting and damping rolling of a ship
EP3740424A4 (fr) * 2018-01-19 2021-11-24 Mrpc As Système de réduction active de roulis à réservoir en u et procédé de réduction active de roulis de navire

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066150A (en) * 1931-11-20 1936-12-29 Gesellschaft Fuer Elek App Ship stabilizer
DE697545C (de) * 1939-05-20 1940-11-19 Siemens App Einrichtung zur Steuerung von aktivierten Tankstabilisierungsanlagen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066150A (en) * 1931-11-20 1936-12-29 Gesellschaft Fuer Elek App Ship stabilizer
DE697545C (de) * 1939-05-20 1940-11-19 Siemens App Einrichtung zur Steuerung von aktivierten Tankstabilisierungsanlagen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
A.P.C., U.S. Printed Application Serial No. 132,695, Published May 11, 1943 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140316620A1 (en) * 2011-09-16 2014-10-23 Q-Tagg R&D Ab Method and device for averting and damping rolling of a ship
US9145191B2 (en) * 2011-09-16 2015-09-29 Q-Tagg R&D Ab Method and device for averting and damping rolling of a ship
EP3740424A4 (fr) * 2018-01-19 2021-11-24 Mrpc As Système de réduction active de roulis à réservoir en u et procédé de réduction active de roulis de navire

Also Published As

Publication number Publication date
BE752840A (fr) 1970-12-16
NL7010390A (fr) 1971-01-19
DE2034876A1 (de) 1971-02-04
FR2053697A5 (fr) 1971-04-16
ES381737A1 (es) 1972-12-01

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