US3256848A - Ship stabilizer - Google Patents

Ship stabilizer Download PDF

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Publication number
US3256848A
US3256848A US404058A US40405864A US3256848A US 3256848 A US3256848 A US 3256848A US 404058 A US404058 A US 404058A US 40405864 A US40405864 A US 40405864A US 3256848 A US3256848 A US 3256848A
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US
United States
Prior art keywords
liquid
tank
plate
storage means
horizontal
Prior art date
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
Application number
US404058A
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English (en)
Inventor
Kenneth C Ripley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
John J Mcmullen Associates Inc
Original Assignee
John J Mcmullen Associates Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by John J Mcmullen Associates Inc filed Critical John J Mcmullen Associates Inc
Priority to US404058A priority Critical patent/US3256848A/en
Priority to GB37217/65A priority patent/GB1075836A/en
Priority to GB55607/66A priority patent/GB1076220A/en
Priority to CA941202A priority patent/CA922174A/en
Priority to SE16114/69A priority patent/SE359787B/xx
Priority to SE12563/65A priority patent/SE351186B/xx
Priority to FI2320/65A priority patent/FI43045B/fi
Priority to NO160036A priority patent/NO118955B/no
Priority to NL6513186A priority patent/NL6513186A/xx
Priority to DEM66945A priority patent/DE1290053B/de
Priority to DE19651531641 priority patent/DE1531641A1/de
Priority to DE19666604717U priority patent/DE6604717U/de
Priority to BE670983D priority patent/BE670983A/xx
Priority to ES0318536A priority patent/ES318536A1/es
Application granted granted Critical
Publication of US3256848A publication Critical patent/US3256848A/en
Priority to FI1693/66A priority patent/FI43953B/fi
Priority to NO16362566A priority patent/NO120619B/no
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention relates to a passive ship stabilization system and more particularly a passive ship stabilization system which comprises an elongated liquid storage means and a horizontal flat plate mounted below the static liquid surface within said liquid storage means.
  • -It is another object of the present invention to provide selectively adjustable means for varying the cross-sectional area of liquid flow beneath the horizontal plate member so that the volume of transferred liquid, and thus the magnitude of the stabilization moment, can be controlled.
  • FIG. 1 is a sectional view illustrating the hull of the ship and illustrating one example of the location of the elongated liquid storage means;
  • FIG. 2 is a top plan view of one embodiment of the present invention with the top of the elongated liquid storage means removed;
  • FIG. 3 is a front elevation taken in section along line 3-3 of FIG. 2;
  • FIG. 4 is a side elevation taken in section along line 44 of FIG. 3;
  • FIGS. 5, 6 and 7 are front elevations taken in section of other and further modifications of the present invention.
  • FIG. 8 is a side elevation taken in sect-ion along line 8-8 of FIG. 7;
  • FIG. 9 is a front elevation taken in section of one of the prior embodiments of the invention incorporating liquid transfer control means
  • FIG. 10 is a top plan taken in section along line 1010 of FIG. 9;
  • FIG. 11 is a front elevation of one of the embodiments of the present invention incorporating yet another liquid transfer control means
  • FIG. 12 is atop plan taken in section along line 1212 of FIG. 11;
  • FIG. 13 is a top plan of one of the embodiments of Patented June 21, 1966 control means.
  • FIG. 14 is a front elevation taken along line 1414 of FIG. 13.
  • FIG. 1 there is illustrated generally a vessel 10 having an elongated liquid containing means 12 mounted athwartship therein.
  • Liquid containing means 12 could be preferably a series of welded side and end plates mounted between two decks 14 and 16 of ship 10, said decks forming the top and bottom of said containing means 12.
  • Tank 12 has a longitudinal dimension which is substantially greater than the transverse dimension thereof.
  • Tank 12 is further characterized by the fact that it has a substantially uniform width and uniform height throughout the longitudinal dimension thereof.
  • transverse members 20 Mounted transversely and spaced from ends 15 of tank 12 are two horizontally disposed, elongated members 20 spaced from the bottom 16 and top 14 of tank 12; said members20 cooperate with ends 15 to form wing tanks at the respective ends of tank 12.
  • the transverse members 20 have lower ends disposed beneath the static liquid level of the liquid body within tank 12. Therefore, transverse members 20 cooperate with bottom 16 of tank 12 to form elongated submerged horizontal nozzles 22 which throttle or dampen the liquid moving therethrough.
  • a horizontally disposed flat plate mounted between the sides of tank 12 is mounted between the transverse members 20.
  • this plate 18 is to prevent liquid from spilling over the transverse members 20 during certain portions of the cycle of roll and also to provide pressures which counteract positive and negative pressures acting on the liquid between transverse members 20 during certain portions of the cycle of roll.
  • transfer and damping liquid are somewhat different from, that set forth in my co-pending application mentioned above.
  • the transverse members 20 have their upper extremities slightly above the static liquid surface of the body of liquid Within tank 12. The operation of this embodiment will now be described. Referring now to FIGS. 1,2, 3 and 4, as the right side of the hull 10 as seen in FIG. 1 is lowered and the left side is raised, there is an accumulation of liquid mass at the right side of tank 12 as seen in FIG. 3. As the roll of the ship continues and the right side of bull 10 begins to rise to the horizontal position, the accumulation of liquid at the right side of tank 12 imparts a stabilization moment to the ship and opposes roll.
  • the periodic stabilizing forces will be imparted to the ship as long as the vessel 10 continues to roll.
  • the liquid within tank 12 can be any suitable type such as sea water, bunker oil, or reserve fuel.
  • the only requirement for the selected liquid is that it has a viscosity sufficiently low enough to freely transfer through the submerged nozzle arrangement 22 defined by transverse members 20 and bottom 16.
  • tank 12 is defined by bottom 16, top 14, and end plates 15.
  • Horizontal plate 18 is again mounted within tank 12 and spaced from the top and bottom thereofl Plate '18 has ends terminating at points spaced from ends 15 of tank 12.
  • Transverse members 24 are mounted at the extremities of horizontal plate 18, each said transverse member having its upper extremi'ty located above the static liquid level of the body of liquid within tank 12 and slightly below top 14 of tank 12. With this arrangement, the liquid is prevented from spilling over the tops of the transverse members 24 and accumulating on the top surface of horizontal plate 18.
  • the static liquid level at the two ends of tank 12 can be raised without increasing the possibility of spillover without choking off air transfer.
  • air is free to transfer between tops 14 and the upper ends of transverse members 24.
  • the operation of the system is the same as that described above with hydrodynamic damping imparted to the liquid by submerged nozzles 22.
  • FIG. 6 there is again illustrated a tank 12 having end plates 15, top '14 and bottom 16 and a horizontal plate 18 disposed therein.
  • plate 18 has its longitudinal extremities spaced from the end plates 15.
  • Upstanding transverse members 26 extend from the ends of horizontal plate 18 to the top 14 of tank 12.
  • At least two holes 28 are provided in top 14 to enable the wing tanks to communicate with the atmosphere in response to the liquid transfer from one end of tank 12 to the other.
  • horizontal nozzles 22 hydrodynamically dampen the transferring liquid, and the air above the static liquid surface freely communicates with the ambient.
  • FIGS. 7 and 8 illustrate another embodiment of the present invention and there is again shown a tank 12 having end plates “15, top 14, bottom 16 and horizontally disposed plate 18.
  • a tank 12 having end plates “15, top 14, bottom 16 and horizontally disposed plate 18.
  • Transverse members 30 are characterized by the fact that each has an elongated slot or hole 32 substantially at the top thereof.
  • An elongated duct or pipe 34 is mounted between the pair of holes 32 in transverse member 30 so that air freely communicates therethrough from one end of tank 12 to the other in response to the movement of liquid therein.
  • This arrangement allows for a damped passage for liquid through horizontal submerged nozzles 22 and an undamped passage for air through the connecting duct 34.
  • the operation of the system is the same as described above.
  • the magnitude of the forces imparted to the vessel is' dependent upon the volume or amount of liquid transfer from one side of the stabilizer to the other. It should also be recognized that because of the existence of plate 18, which confines the surface of the liquid within the interconnection passage between the two wing tanks, the volume or amount of liquid transfer per unit time cannot be controlled to any substantial degree by merely changing the liquid level within the respective wing tanks. Therefore, some other control means is incorporated to control the amount or volume of liquid transfer taking place between the wing tanks so that the magnitudes of the forces and stabilizing moment imparted to the vessel can be controlled. I
  • FIGS. 9 and 10 there is illustrated one example of control means which vary the cross-sectional area of flow under plate 18 so that a predetermined rate of liquid transfer can be selected.
  • at least one side of tank 12 is provided with a vertical slot extending from the bottom 16 of tank 12 to the vertical location of plate 18.
  • This slot 36 can be sealed by any conventional means (not shown).
  • Slidably mounted within slot 36 is an elongated plate valve or gate 38 .which is adapted to be slidably inserted to any position across the transverse dimension of tank 12.
  • gate 38 will be inserted to some predetermined position across the transverse dimension of tank 12 so that the cross-sectional area of liquid flow is substantially reduced. With this reduction of cross-sectional area of liquid transfer, transfer of liquid during one-half cycle of roll is made small. Conversely, if it is desired to have a greater stabilizing moment imparted to the vessel, gate 38 will be withdrawn to increase the cross-sectional area of liquid transfer through that portion of the system beneath plate 18.
  • a butterfly valve or rotatably mounted plate 40 is disposed substantially in the center of the system.
  • the angular position of butterfly valve 40 is controlled by a vertically mounted shaft 42 and a conventional hand wheel 44 or the like.
  • the hand wheel and consequently the butterfly valve 40 is rotated so that the valve 40 assumes the position shown in phantom in FIG. 12. With the valve 40 in this position, the greatest cross-sectional area of liquid transfer is provided for the stabilization system. If a smaller liquid transfer is desired for the stabilization system, valve 40 is rotated by hand wheel 44 and shaft 40 to the position shown in solid in FIG. 12 so that the cross-sectional area of liquid transfer is substantially reduced.
  • the control means comprises a horizontal, transverse slot mounted in plate 18 which is adapted to receive a transverse gate or plate 46.
  • the transverse slot in plate 18 is provided with the conventional sealing means (not shown) to prevent liquid leakage in the usual manner.
  • Gate 46 is adapted to assume any vertical position with respect to plate 18 so that when it is desired to have a small liquid transfer within the stabilization system, plate 46 would be inserted to a lower position with respect to 18 so that the cross-sectional area of liquid transfer within the system is substantially reduced. If it is desired to have a greater liquid transfer within the system, plate 46 is upwardly withdrawn so that the cross-sectional area of liquid transfer is increased.
  • an eflrcient stabilization system results which is adapted to control the magnitude of stabilization forces imparted to the vessel.
  • a passive ship stabilizer comprising an elongated liquid storage means having a longitudinal dimension greater than its transverse dimension, said storage means having a uniform transverse dimension throughout the length thereof, a body of liquid partially filling said liquid storage means and having a static liquid level spaced from .the top and bottom of said liquid storage means, at least a port-ion of said static liquid level being in a free surface condition, a pair of transverse members vertically disposed and vmounted across said transverse dimension of said liquid storage means, said transverse members spaced from each other and from the ends of said liquid storage means to form wing tanks and an interconnecting tank therewith, each said transverse memberhaving a lower end spaced from the bottom of said liquid storage means to form a horizontal nozzle, said horizontal nozzle disposed below said static liquid level, a horizontal plate spaced from the top and bottom of said storage means and engaging said transverse members above the lower ends thereof, said horizontal plate extending laterally to the walls of said interconnecting tank to restrict the liquid surface therein, said wing tan
US404058A 1964-10-15 1964-10-15 Ship stabilizer Expired - Lifetime US3256848A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US404058A US3256848A (en) 1964-10-15 1964-10-15 Ship stabilizer
GB37217/65A GB1075836A (en) 1964-10-15 1965-08-31 Ship stabilizer
GB55607/66A GB1076220A (en) 1964-10-15 1965-08-31 Passive tank ship stabilizer
CA941202A CA922174A (en) 1964-10-15 1965-09-22 Ship stabilizer
SE16114/69A SE359787B (no) 1964-10-15 1965-09-28
SE12563/65A SE351186B (no) 1964-10-15 1965-09-28
FI2320/65A FI43045B (no) 1964-10-15 1965-09-29
NL6513186A NL6513186A (no) 1964-10-15 1965-10-12
NO160036A NO118955B (no) 1964-10-15 1965-10-12
DEM66945A DE1290053B (de) 1964-10-15 1965-10-14 Passive Schiffsstabilisierungsanlage mit einem langgestreckten, quaderartigen Fluessigkeitsbehaelter
DE19651531641 DE1531641A1 (de) 1964-10-15 1965-10-14 Passive Schiffstabilisierungsanlage
DE19666604717U DE6604717U (de) 1964-10-15 1965-10-14 Schiff mit stabilisierungsanlage
BE670983D BE670983A (no) 1964-10-15 1965-10-15
ES0318536A ES318536A1 (es) 1964-10-15 1965-10-15 Estabilizador pasivo para buques.
FI1693/66A FI43953B (no) 1964-10-15 1966-06-23
NO16362566A NO120619B (no) 1964-10-15 1966-06-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US404058A US3256848A (en) 1964-10-15 1964-10-15 Ship stabilizer

Publications (1)

Publication Number Publication Date
US3256848A true US3256848A (en) 1966-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US404058A Expired - Lifetime US3256848A (en) 1964-10-15 1964-10-15 Ship stabilizer

Country Status (10)

Country Link
US (1) US3256848A (no)
BE (1) BE670983A (no)
CA (1) CA922174A (no)
DE (3) DE1531641A1 (no)
ES (1) ES318536A1 (no)
FI (2) FI43045B (no)
GB (2) GB1075836A (no)
NL (1) NL6513186A (no)
NO (1) NO118955B (no)
SE (2) SE351186B (no)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347199A (en) * 1965-01-29 1967-10-17 Nat Res Dev Roll stabilizers
US3380423A (en) * 1966-03-31 1968-04-30 Mcmullen Ass John J Ship stabilizer
US3407772A (en) * 1966-04-06 1968-10-29 Nat Res Dev Roll stabiliser for floating bodies
US3487801A (en) * 1966-10-31 1970-01-06 Parsons Co Ralph M Method and apparatus for stabilization of vessels
CN109398655A (zh) * 2018-11-16 2019-03-01 湖南工程学院 一种带倾转功能的水下机器人

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112722183B (zh) * 2020-07-15 2021-12-14 上海海事大学 一种航海船体平衡装置的安装方法
CN112519971B (zh) * 2020-12-09 2022-08-12 中船邮轮科技发展有限公司 一种设于泳池内用以减少船舶横摇的装置及控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2077143A (en) * 1932-01-06 1937-04-13 Firm Of Townsend & Decker Means for stabilizing ships with fuel oil
US3083674A (en) * 1961-10-13 1963-04-02 Mcmullen Ass John J Linear-response flume stabilizer
US3083672A (en) * 1960-10-25 1963-04-02 Mcmullen Ass John J Stabilization system
US3103198A (en) * 1960-10-25 1963-09-10 Mcmullen Ass John J Safety arrangement for stabilization system

Family Cites Families (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.
US1007348A (en) * 1911-07-06 1911-10-31 Hermann Frahm Means for damping the rolling motion of ships.
DE634798C (de) * 1935-06-02 1936-09-04 Siemens App Und Maschinen G M Tankstabilisierungsanlage fuer Schiffe
DE652792C (de) * 1936-04-01 1937-11-08 Siemens App Schiffsstabilisierungsanlage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2077143A (en) * 1932-01-06 1937-04-13 Firm Of Townsend & Decker Means for stabilizing ships with fuel oil
US3083672A (en) * 1960-10-25 1963-04-02 Mcmullen Ass John J Stabilization system
US3103198A (en) * 1960-10-25 1963-09-10 Mcmullen Ass John J Safety arrangement for stabilization system
US3083674A (en) * 1961-10-13 1963-04-02 Mcmullen Ass John J Linear-response flume stabilizer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347199A (en) * 1965-01-29 1967-10-17 Nat Res Dev Roll stabilizers
US3380423A (en) * 1966-03-31 1968-04-30 Mcmullen Ass John J Ship stabilizer
US3407772A (en) * 1966-04-06 1968-10-29 Nat Res Dev Roll stabiliser for floating bodies
US3487801A (en) * 1966-10-31 1970-01-06 Parsons Co Ralph M Method and apparatus for stabilization of vessels
CN109398655A (zh) * 2018-11-16 2019-03-01 湖南工程学院 一种带倾转功能的水下机器人
CN109398655B (zh) * 2018-11-16 2023-09-08 湖南工程学院 一种带倾转功能的水下机器人

Also Published As

Publication number Publication date
FI43045B (no) 1970-09-02
DE6604717U (de) 1970-02-12
ES318536A1 (es) 1966-10-16
DE1531641A1 (de) 1970-01-29
DE1290053B (de) 1969-02-27
FI43953B (no) 1971-03-31
GB1076220A (en) 1967-07-19
SE351186B (no) 1972-11-20
BE670983A (no) 1966-04-15
NO118955B (no) 1970-03-02
NL6513186A (no) 1966-04-18
GB1075836A (en) 1967-07-12
SE359787B (no) 1973-09-10
CA922174A (en) 1973-03-06

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