US3054373A - Flume type heeling tank stabilizer - Google Patents

Flume type heeling tank stabilizer Download PDF

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Publication number
US3054373A
US3054373A US9144A US914460A US3054373A US 3054373 A US3054373 A US 3054373A US 9144 A US9144 A US 9144A US 914460 A US914460 A US 914460A US 3054373 A US3054373 A US 3054373A
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United States
Prior art keywords
tanks
duct
tank
ship
feet
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US9144A
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English (en)
Inventor
Kenneth C Ripley
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John J Mcmullen Associates Inc
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John J Mcmullen Associates Inc
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Filing date
Publication date
Application filed by John J Mcmullen Associates Inc filed Critical John J Mcmullen Associates Inc
Priority to US9144A priority Critical patent/US3054373A/en
Priority to GB39766/60A priority patent/GB962343A/en
Priority to BE598596A priority patent/BE598596A/fr
Application granted granted Critical
Publication of US3054373A publication Critical patent/US3054373A/en
Priority to NL6816201A priority patent/NL6816201A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • the present invention relates to ship stabilization systems and more particularly to ship stabilization systems wherein passive antirolling tanks are utilized.
  • antiroll fins projecting from the sides of the vessel to create large resistances to rolling action. Some of these fins are fixed; others are controllable, but all fail to prevent roll in heavy seas at speeds below about 15 knots. On ships designed for low speeds, such as missile tracking vessels while on station, antirolling fins are ineffective.
  • a system of tanks for shifting the center of gravity of a vessel to create a righting moment to rolling or heeling action has also been tried.
  • These systems utilized, generally, a pair of closed tanks, one located on each side of the ship and connected by a U-shaped crossover tube which was completely filled with water while in operation and also by an air duct connected between the tops of the tanks and having a valve for controlling the flow of air between the tanks.
  • the method of designing the system for optimum operation consisted in proportioning the tanks and crossover ducts to give the correct computed value for the ratio of the horizontal sectional area of the tanks to the vertical sectional area of the cross-over duct.
  • a tuning once established could not be changed since the duct cross-section was fixed. This gave a lack of control to the system since only by changing the damping of the air throttling system could the tanks system be made less critical for passing through resonance. Changing the damping of the air throttling system quite often meant that the system was too well damped to allow suflicient water transfer between the tanks. Thus, although the system was occasionally well adjusted for a particular type of see, it failed in others.
  • the present invention utilizes a type of construction which eliminates the disadvantages of the conventional U tube type of system described above.
  • all need to have a separate connection for air is eliminated.
  • This elimination is accomplished by extending the cross over ducts to substantially the level of the tank tops and making the transfer duct into a flu'me. With this arrangement, the air space above the water surface in the duct is so large that air throttling effects no longer exist.
  • both the natural frequency and the damping of the stabilizer are functions of the geometry of the hydrodynamic portion of the stabilizer alone.
  • a nozzle with a throat extending the full height of the duct is provided in the duct to produce additional damping into the system.
  • This system is adjustable merely by changing the level of liquid in the tanks to vary the natural frequency of the system. Once the system is adjusted, no attendance by ship personnel is needed, and the system will perform satisfactorily irrespective of sea conditions.
  • the system may be fitted on one deck and carries only liquid which serves a useful purpose thus lowering the space and weight requirements needed for the conventional U-tube type of system. Since there are no air throttling valves, the noise is reduced considerably.
  • An object of the present invention is to provide a ship stabilizing system which is economical in cost, weight, and space.
  • Another object of this invention is the provision of a passive antiroll tank system which is relatively quiet in operation in comparison with known devices of kind.
  • Still another object of the present invention is to provide an antiroll system which requires a of attendance but which can be adjusted for tuning if the need arises.
  • FIG. 1 is a sectional view in elevation of an embodiment of the invention mounted in a ship hull;
  • FIG. 2 is a top view of the tank system of FIG. 1;
  • FIG. 3 is an isometric view of the tank system of FIG. 1; a
  • FIG. 4 is a sectional view in elevation of a second embodiment of the invention.
  • FIG. Si is a sectional view taken on line 55 of FIG. 4.
  • FIG. 6 is an enlarged view of one of the nozzles of the embodiment shown in FIG. 4.
  • FIG. 1 a hull 11 of a surface vessel. It will be realized that the hull shape shown is for illustrative purposes only andthat the hull may have any desired configuration. V
  • a pair of storage tanks 12 interconnected by a flume or duct 13 which as can be seen from the figures has substantially the same height as the tanks and both the tanks and the duct are open to air at approximately atmospheric pressure.
  • the duct 13 is relatively wide at its center portion and has a restriction or nozzle 14 at each end at the point where it enters each tank.
  • a pair of semi-cylindrical members 16 which serve to smooth the flow of liquid and eliminate stresses at these points.
  • the nozzles or restrictions 14 as shown have a constant width dimension from top to bottom at,
  • the width dimension may vary from top to bottom.
  • the tanks and duct normally contain arpredetermined levelof liquid, such as water or fuel oil, as can be seen in FIGS. 1 and 3.
  • the initial tuning of the system for roll reduction is by properly proportioning of the eifective horizontal sectional area of the tanks to the vertical sectional area of water in the crossover duct. With this system it is possible to vary the sectional area of water in the duct simply by raising or lowering the initial level of liquid of the system.
  • change of water level provides a means for adjustment of-the damping and a tuning of the system throughout the service life of the stabilizer A r i
  • a flume type stabilizer must deliberately be overdesigned as regardscapacity, for ca pacity expressed asso many feet of possible transfer of water between tanks.
  • FIGS. 4-6 A second embodiment of the invention is illustrated in FIGS. 4-6.
  • This embodiment' is' designed for installation in an existing reserve fuel tank.-
  • the hull 11 has disposed therein, between decks 21 and 22, a tank 23 which may contain fuel oil as shown or alternatively may contain water or other liquids.
  • tank 23 extends transversely across the ship substantially the entire width thereof.
  • a plurality of parallel pipes 25, 26 extending from top to bottom inside the tank;
  • Each of the pipes has welded thereto a pair of fins 27, along the plane of the array of pipes.
  • the pipes with the attached fins act as restrictions to the transfer of liquid from one heeling tank to the other as the ship rolls. As shown in FIG. 6 the flow is broken away by the fins to form 'a throat of constant width independently of the amount of roll. Round pipes of larger diameter without fins could be substituted but the flow rate would tend to cause variation of the effective throat diameter due to change in Reynolds number with change of flow velocity.
  • The' attached fins correct for this possibility and allow more accurate tuning than would be possible without the fins.
  • the arrays of 'parallelpipes' are shown as being inclined inward at the top. This allows storage of a maximum amount of liquid during roll' and thereby gives a maximum righting moment to counteract the roll. It will be realized, however, that the inclination of the array is not necessary for the device to be operable.
  • the pipes may be arranged vertically or'inclined at a different angle from that shown in FIG. 4. e
  • the invention described herein provides a means of roll reduction in situations where conventional roll reducing techniques fail. It has been found that in addition to roll reduction there are also substantial reductions in both yaw and sway. Additional advantages are the inherent quietness of the system, economy of space, adjustable tuning merely by varying liquid level, and the minimum of attendance required for operation of the device. Although the system has been described for roll reduction in ships or boats it will be realized that it may be useful in other vehicles as well and that the principles may be applied for example to pitch reduction as Well as roll reduction.
  • a vessel and a stabilization system therefor comprising an elongated enclosure extending transversely across said vessel, wall means compartmenting said enclosure to define a wing tank on each end of said enclosure and an interconnecting central compartment, said wall means defining restricted vertically elongated openings communicating said wing tanks and said central compartment with the openings being shaped to cause substantial jet loss of head from liquid passing therethrough, and a body of liquid in said enclosure having a liquid level such that in a repose horizontal condition the openings defined in said wall means extend substantially above and below the level of the liquid to provide unrestricted passage for air and restricted passage for liquid.
  • a vessel and a stabilization system therefore comprising, a pair of wing tanks mounted in spaced relation on opposite sides of the vessel centerline, a crossover duct interconnecting said wing tanks, said duct and said wing tanks mutually defining restricted communicating vertically elongated openings to produce a substantial jet loss of head from liquid passing therethrough, liquid in said wing tanks and said duct at a uniform level throughout said system which level is spaced substantially below the top of said wing tanks and said duct when the system is in a repose horizontal condition, and said wing tanks and said duct defining a continuous airspace, including the upper portion of said restricted communicating openings, above the level of liquid which allows for the free unrestricted exchange and equalization of air as between said wing tanks and said duct.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Vibration Prevention Devices (AREA)
US9144A 1960-02-16 1960-02-16 Flume type heeling tank stabilizer Expired - Lifetime US3054373A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US9144A US3054373A (en) 1960-02-16 1960-02-16 Flume type heeling tank stabilizer
GB39766/60A GB962343A (en) 1960-02-16 1960-11-18 Flume type tank stabilizer
BE598596A BE598596A (fr) 1960-02-16 1960-12-28 Stabilisateur à réservoirs de bande du type à bief
NL6816201A NL6816201A (en:Method) 1960-02-16 1968-11-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9144A US3054373A (en) 1960-02-16 1960-02-16 Flume type heeling tank stabilizer

Publications (1)

Publication Number Publication Date
US3054373A true US3054373A (en) 1962-09-18

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ID=21735838

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US9144A Expired - Lifetime US3054373A (en) 1960-02-16 1960-02-16 Flume type heeling tank stabilizer

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US (1) US3054373A (en:Method)
BE (1) BE598596A (en:Method)
GB (1) GB962343A (en:Method)
NL (1) NL6816201A (en:Method)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083674A (en) * 1961-10-13 1963-04-02 Mcmullen Ass John J Linear-response flume stabilizer
US3155066A (en) * 1962-04-03 1964-11-03 Mcmullen Ass John J Ship stabilizer
US3165085A (en) * 1962-12-18 1965-01-12 Mcmullen Ass John J Passive stabilizer system for a boat and the like
US3256847A (en) * 1964-03-06 1966-06-21 Mcmullen Ass John J Multiply compartmented passive stabilizer
US3282239A (en) * 1964-07-30 1966-11-01 Mcmullen Ass John J Passive ship stabilization system using damping along center line only
US3286677A (en) * 1964-11-09 1966-11-22 Exxon Research Engineering Co Anti-pitch systems
US3349743A (en) * 1965-08-24 1967-10-31 Mcmullen Ass John J Ship stabilizer
DE1274909B (de) * 1966-02-07 1968-08-08 Mcmullen Ass John J Stabilisierungssystem fuer Schiffe
US3422782A (en) * 1967-11-30 1969-01-21 Flume Stabilization Syst Passive tank stabilizer with freedom in direction of sway
US3653354A (en) * 1970-03-02 1972-04-04 Flume Stabilization Syst Catamaran stabilizer
US20070169675A1 (en) * 2005-12-31 2007-07-26 Basta Samuel T Floating drive on boat docking apparatus
US8079321B2 (en) 2006-12-15 2011-12-20 Exxonmobil Upstream Research Company Long tank FSRU/FLSV/LNGC
US9932096B1 (en) * 2017-05-17 2018-04-03 Thomas George Boat leveling system

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1291247B (de) * 1964-07-22 1969-03-20 Mcmullen Associates Inc Passive Tankstabilisierungseinrichtung fuer Schwimmkoerper
US3270702A (en) * 1964-07-30 1966-09-06 Mcmullen Ass John J Ship stabilizer comprising weirs
US3272169A (en) * 1964-07-30 1966-09-13 Mcmullen Ass John J Passive ship stabilizer using terminal damping means
US3272170A (en) * 1964-10-27 1966-09-13 Mcmullen Ass John J Ship stabilizer using elongated weir means
CN109367693B (zh) * 2018-10-25 2022-03-15 上海船舶工艺研究所(中国船舶工业集团公司第十一研究所) 一种船用大型设备基座的无余量安装方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190813784A (en) * 1907-09-07 1908-10-08 Hermann Frahm Improvements in and connected with Means for Damping the Rolling Motion of Ships.
US1023477A (en) * 1911-07-19 1912-04-16 Joseph R Oldham Ship construction.
GB435100A (en) * 1934-06-27 1935-09-13 Siemens App Und Maschinen Gmbh Improvements in or relating to anti-rolling tank stabilising installations for ships
DE675003C (de) * 1937-05-13 1939-04-27 Askania Werke Akt Ges Fluessigkeitstank fuer Wasserfahrzeuge zur Beeinflussung des Stabilitaetsmomentes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190813784A (en) * 1907-09-07 1908-10-08 Hermann Frahm Improvements in and connected with Means for Damping the Rolling Motion of Ships.
US1023477A (en) * 1911-07-19 1912-04-16 Joseph R Oldham Ship construction.
GB435100A (en) * 1934-06-27 1935-09-13 Siemens App Und Maschinen Gmbh Improvements in or relating to anti-rolling tank stabilising installations for ships
DE675003C (de) * 1937-05-13 1939-04-27 Askania Werke Akt Ges Fluessigkeitstank fuer Wasserfahrzeuge zur Beeinflussung des Stabilitaetsmomentes

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3083674A (en) * 1961-10-13 1963-04-02 Mcmullen Ass John J Linear-response flume stabilizer
US3155066A (en) * 1962-04-03 1964-11-03 Mcmullen Ass John J Ship stabilizer
US3165085A (en) * 1962-12-18 1965-01-12 Mcmullen Ass John J Passive stabilizer system for a boat and the like
US3256847A (en) * 1964-03-06 1966-06-21 Mcmullen Ass John J Multiply compartmented passive stabilizer
US3282239A (en) * 1964-07-30 1966-11-01 Mcmullen Ass John J Passive ship stabilization system using damping along center line only
US3286677A (en) * 1964-11-09 1966-11-22 Exxon Research Engineering Co Anti-pitch systems
US3349743A (en) * 1965-08-24 1967-10-31 Mcmullen Ass John J Ship stabilizer
DE1274909B (de) * 1966-02-07 1968-08-08 Mcmullen Ass John J Stabilisierungssystem fuer Schiffe
US3422782A (en) * 1967-11-30 1969-01-21 Flume Stabilization Syst Passive tank stabilizer with freedom in direction of sway
US3653354A (en) * 1970-03-02 1972-04-04 Flume Stabilization Syst Catamaran stabilizer
US20070169675A1 (en) * 2005-12-31 2007-07-26 Basta Samuel T Floating drive on boat docking apparatus
US7712425B2 (en) * 2005-12-31 2010-05-11 Basta Samuel T Floating drive on boat docking apparatus
US20100212567A1 (en) * 2005-12-31 2010-08-26 Ipo Llc Floating drive on boat docking apparatus
US8079321B2 (en) 2006-12-15 2011-12-20 Exxonmobil Upstream Research Company Long tank FSRU/FLSV/LNGC
US9932096B1 (en) * 2017-05-17 2018-04-03 Thomas George Boat leveling system

Also Published As

Publication number Publication date
GB962343A (en) 1964-07-01
NL6816201A (en:Method) 1969-01-27
BE598596A (fr) 1961-04-14

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