US3272170A - Ship stabilizer using elongated weir means - Google Patents

Ship stabilizer using elongated weir means Download PDF

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Publication number
US3272170A
US3272170A US406748A US40674864A US3272170A US 3272170 A US3272170 A US 3272170A US 406748 A US406748 A US 406748A US 40674864 A US40674864 A US 40674864A US 3272170 A US3272170 A US 3272170A
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US
United States
Prior art keywords
tank
weir
liquid
ship
elongated
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
US406748A
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English (en)
Inventor
Edward D Dreyfus
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 US406748A priority Critical patent/US3272170A/en
Priority to GB45110/65A priority patent/GB1057789A/en
Priority to NO160204A priority patent/NO122824B/no
Priority to NL6513829A priority patent/NL6513829A/xx
Priority to FI2561/65A priority patent/FI43691B/fi
Priority to DEP1271A priority patent/DE1271580B/de
Priority to SE13813/65A priority patent/SE338931B/xx
Priority to BE671503D priority patent/BE671503A/xx
Priority to ES0318960A priority patent/ES318960A1/es
Application granted granted Critical
Publication of US3272170A publication Critical patent/US3272170A/en
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

  • This invention relates to a passive ship stabilizer and more particularly a ship stabilizer comprising elongated liquid storage means and an elongated longitudinally disposed weir means provided therein.
  • Passive stabilization systems for water going vessels have become quite well known in the art. These systems are characterized by comprising an elongated liquid storage means mounted athwartship in the vessel and containing a quantity of fluid or liquid which passes through proper damping means in response to the roll of the vessel, whereby the transferring liquid may pass from one end of said liquid container to the other and imparts a stabilization moment to the vessel. It is a purpose of the present invention to provide an improved system over the above-mentioned passive stabilization systems for water going vessels.
  • It is an object of the present invention to provide a passive ship stabilization system comprising an elongated liquid storage means and a longitudinally elongated weir or dam means mounted in the center of said liquid storage means so that the amount of fluid needed in said stabilization system is substantially reduced and the stabilizing moment developed per pound of liquid in the system (efliciency) is increased.
  • FIG. 1 is a schematic representation of a ships hull showing one example of the location of the passive stabilization system of the present invention
  • FIG. 2 is a horizontal sectional view of the present invention taken along the line 2-2 of FIG. 1, with the liquid omitted;
  • FIG. 3 is a vertical longitudinal sectional view taken along line 3-3 of FIG. 2;
  • FIG. 4 is a vertical transverse sectional View taken along line 4-4 of FIG. 3.
  • FIG. 1 there is illustrated a ships hull having the ship stabilization system 12 mounted between two decks thereof, said stabilization system having a longitudinal axis which extends substantially across the entire dimension of ship 10.
  • a body of liquid is disposed within the stabilization system 12 and a portion of said body of liquid transfers from one side of the stabilization system 12 to the other in response to the roll of the vessel 10 so that a stabilization moment is applied to vessel 10 in a manner more fully described below.
  • the stabilization system comprises an elongated tank 14 having side plates 16 and end plates 18. As best seen in FIG. 2, the longitudinal dimension is substantially greater than the transverse dimension of tank 14.
  • the side plates 16 and end plates 18 are preferably welded or otherwise mounted between two decks of the ship so that the upper deck 21 acts as a top and the lower deck 22 acts as the bottom for tank 14.
  • An elongated weir or dam 20 is disposed substantially symmetrical within tank 14.
  • Said dam 20 comprises a 3,272,178 Patented Sept. 13', 1966 pair of plates 26 mounted transversely across tank 14, having one end integral with the bottom 22 of tank 14 and the other end terminating spaced from the top of tank 14. Plates 26 are mounted at an angle with respect to the vertical and both said plates 26 are inclined toward the center of tank 14 for a purpose to be described below.
  • a horizontally mounted plate 28 extends from one side plate 16 to the other and between the top ends of inclined plates 26.
  • weir 20 extends along approximately one-half the longitudinal dimension of tank 14. Plate 28 can have a roughened surface so that kinetic energy of fluid flowing thereover is dissipated in a manner described more fully below.
  • a plurality of tubes 30 cooperate with partitions 32 to define plurality of vertically arranged nozzles 34.
  • Nozzles 34 cooperate with end plates 18 to form a pair of wing tanks located at the extremities of tank 14. The function of nozzles 34 is to dissipate kinetic energy of liquid moving therethrough and also to dampen the movement of fluid within tank 14 to some extent.
  • Pipe 36 is connected with and communicates through plates 26, said pipe 36 having a conventional manual valve 38 which selectively controls the movement of fluid through pipe 36.
  • the only purpose of pipe 36 and valve 38 is to enable communication between one side of tank 14 and the other for the purpose of draining through conventional drains (not shown).
  • valve 38 is normally closed and no movement of fluid takes place through pipe 36.
  • a body of water is disposed throughout tank 14 and has the same liquid level throughout when the body of liquid is in a static state.
  • the system should be designed such that the static liquid level throughout tank 14 is approximately twice the distance between plate 28 and the floor of tank 14.
  • the elongated weir defined by plates 26 and 28 functions to decrease the amount of liquid necessary for imparting optimum stabilization moments to the vessel. It is believed that the most inefficient portion of liquid within the passive stabilization system is that found in the center bottom of the elongated tank such as tank 14.
  • the elongated weir 20 of the present invention functions to remove this inefficient mass of liquid and the effects thereof and yet enables suflicient liquid transfer thereover so that optimum stabilization moments can be imparted to the vessel.
  • any suitable type liquid can be used in the system without departing from the spirit of the present invention.
  • Liquids such as fuel oil, bunker oil, sea water, and the like can be used. It can be seen from the above description that proper stabilization can be imparted to the ship with increased efficiency. This is afforded by the present design of the stabilization system and the elongated weir means 20 which eliminates great ineflicient volumes of water.
  • a stabilization system for ships and the like comprising an elongated enclosed tank mounted in the ship with its longitudinal axis extending transverse to the longitudinal axis of the ship, said tank having a pair of wing portions at opposite ends thereof, and an interconnecting portion extending from one wing portion to the other, an elongated weir mounted on the bottom of said interconnecting portion and having a top spaced below the top of said tank, said weir top being mounted generally in a horizontal position and extending throughout a major part of the length of said interconnecting portion, said weir also extending from one side of said tank to the other and having a downwardly sloping end plate extending from each end of said weir top to the tank bottom, a body of liquid partially filling said tank to a predetermined static level, the top of said tank at said inter-. connecting portion being above said static liquid level to define an air space above said liquid body and below said tank top.
  • each end plate of said weir slopes outwardly as well as downwardly to the bottom of said tank.
  • a stabilization system as set forth in claim 1 further comprising liquid transfer restricting means mounted in each wing portion of said tank.
  • a stabilization system for a ship and the like comprising an elongated tank mounted across said ship, said tank having a pair of wing portions at opposite ends thereof and an interconnecting portion extending from one wing portion to the other, a flat horizontally disposed plate extending from one side of said tank to the other and having longitudinal ends symmetrically positioned in said tank, said plate extending substantially throughout the length of said interconnecting portion, said plate being spaced vertically between the top and bottom of said tank, a body of liquid within said tank having a static liquid level between said tank top and the upper surface of said plate such that an air space is defined between said tank top and said static liquid surface, said static liquid surface being continuous in said wing and interconnecting portions, an end plate mounted at each end of said flat plate and extending downwardly therefrom to direct a portion of said liquid body over the top of said flat plate when transferring in response to the roll of the ship, said system further comprising means for enabling liquid to transfer from one wing portion toward the other beneath said plate.

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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)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
US406748A 1964-10-27 1964-10-27 Ship stabilizer using elongated weir means Expired - Lifetime US3272170A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
US406748A US3272170A (en) 1964-10-27 1964-10-27 Ship stabilizer using elongated weir means
NO160204A NO122824B (xx) 1964-10-27 1965-10-25
GB45110/65A GB1057789A (en) 1964-10-27 1965-10-25 A passive-tank ship stabilization system
FI2561/65A FI43691B (xx) 1964-10-27 1965-10-26
NL6513829A NL6513829A (xx) 1964-10-27 1965-10-26
DEP1271A DE1271580B (de) 1964-10-27 1965-10-26 Passives Schiffsstabilisierungssystem
SE13813/65A SE338931B (xx) 1964-10-27 1965-10-26
BE671503D BE671503A (xx) 1964-10-27 1965-10-27
ES0318960A ES318960A1 (es) 1964-10-27 1965-10-27 Sistema de estabilizacion pasivo.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US406748A US3272170A (en) 1964-10-27 1964-10-27 Ship stabilizer using elongated weir means

Publications (1)

Publication Number Publication Date
US3272170A true US3272170A (en) 1966-09-13

Family

ID=23609306

Family Applications (1)

Application Number Title Priority Date Filing Date
US406748A Expired - Lifetime US3272170A (en) 1964-10-27 1964-10-27 Ship stabilizer using elongated weir means

Country Status (9)

Country Link
US (1) US3272170A (xx)
BE (1) BE671503A (xx)
DE (1) DE1271580B (xx)
ES (1) ES318960A1 (xx)
FI (1) FI43691B (xx)
GB (1) GB1057789A (xx)
NL (1) NL6513829A (xx)
NO (1) NO122824B (xx)
SE (1) SE338931B (xx)

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
US3407772A (en) * 1966-04-06 1968-10-29 Nat Res Dev Roll stabiliser for floating bodies
US3583353A (en) * 1968-02-28 1971-06-08 Nat Res Dev Passive roll stabilizers
US4005670A (en) * 1971-02-01 1977-02-01 Campbell Industries Passive stabilization system for ships
JP2015077967A (ja) * 2013-10-16 2015-04-23 ヒュンダイ ヘビー インダストリーズ カンパニー リミテッド 自由水面型横揺れ低減タンク

Citations (3)

* 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
DE1153283B (de) * 1960-12-24 1963-08-22 Siemens Ag Anlage zur Daempfung der Schwingbewegung eines schwimmfaehigen Koerpers, insbesondere Schlingerdaempfungsanlage fuer Schiffe
US3165085A (en) * 1962-12-18 1965-01-12 Mcmullen Ass John J Passive stabilizer system for a boat and the like

Family Cites Families (3)

* 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.
DE675003C (de) * 1937-05-13 1939-04-27 Askania Werke Akt Ges Fluessigkeitstank fuer Wasserfahrzeuge zur Beeinflussung des Stabilitaetsmomentes
US3054373A (en) * 1960-02-16 1962-09-18 Mcmullen Ass John J Flume type heeling tank stabilizer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1153283B (de) * 1960-12-24 1963-08-22 Siemens Ag Anlage zur Daempfung der Schwingbewegung eines schwimmfaehigen Koerpers, insbesondere Schlingerdaempfungsanlage fuer Schiffe
US3083674A (en) * 1961-10-13 1963-04-02 Mcmullen Ass John J Linear-response flume stabilizer
US3165085A (en) * 1962-12-18 1965-01-12 Mcmullen Ass John J Passive stabilizer system for a boat and the like

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
US3407772A (en) * 1966-04-06 1968-10-29 Nat Res Dev Roll stabiliser for floating bodies
US3583353A (en) * 1968-02-28 1971-06-08 Nat Res Dev Passive roll stabilizers
US4005670A (en) * 1971-02-01 1977-02-01 Campbell Industries Passive stabilization system for ships
JP2015077967A (ja) * 2013-10-16 2015-04-23 ヒュンダイ ヘビー インダストリーズ カンパニー リミテッド 自由水面型横揺れ低減タンク
CN104554646A (zh) * 2013-10-16 2015-04-29 现代重工业株式会社 被动式减摇水舱

Also Published As

Publication number Publication date
GB1057789A (en) 1967-02-08
SE338931B (xx) 1971-09-20
NL6513829A (xx) 1966-04-28
ES318960A1 (es) 1966-09-01
FI43691B (xx) 1971-02-01
DE1271580B (de) 1968-06-27
NO122824B (xx) 1971-08-16
BE671503A (xx) 1966-04-27

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