US3606851A - Stabilizer with upright end tanks - Google Patents

Stabilizer with upright end tanks Download PDF

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Publication number
US3606851A
US3606851A US828609A US3606851DA US3606851A US 3606851 A US3606851 A US 3606851A US 828609 A US828609 A US 828609A US 3606851D A US3606851D A US 3606851DA US 3606851 A US3606851 A US 3606851A
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US
United States
Prior art keywords
tank
liquid
stabilizer
main body
roll
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
US828609A
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English (en)
Inventor
Frans V A Pangalila
John P Martin
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.)
FLAME STABILIZATION SYSTEMS
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FLAME STABILIZATION SYSTEMS
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Publication date
Application filed by FLAME STABILIZATION SYSTEMS filed Critical FLAME STABILIZATION SYSTEMS
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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

  • FIG.3 22 32 36 38 32 36 3a 32 22 2a 34 R 26 34 l 26 l 2 "Ln 3. 'I.” 28
  • the passive tank stabilizer in its simplest form, is a tank, partially filled with a liquid, lying across the width of a vessel to be stabilized.
  • the liquid flows to and fro in the tank and, if the tank is designed properly, the liquid flow remains 90 out of phase with the roll of the vessel. Inthis manner, the liquid in the tank creates a moment which opposes the roll of the vessel and thereby tends to stabilize same.
  • the passive tank stabilizer is often housed below a dack of the associated ship, the deck immediately above the tank often serving as a tank cover plate.
  • the presence of this cover plate results in What may be termed tank saturation. More particularly, the presence of the cover plate defines an upper limit to the flow of tank liquid and, as a consequence, defines an upper limit to the magnitude of the eifective stabilizing moment. It is toward increasing the roll angle at which tank saturation occurs that the present invention is directed.
  • the present invention relates to a passive tank stabilizer to be used in ships.
  • the tank of the present invention comprises a main body region appended to which is a pair of communicating upright end tanks. Within the tank is housed an amount of liquid whose surface, when the tank is level, lies below the upper wall of the main body region.
  • the tank of the present invention operates extremely well.
  • the tank liquid is not constrained by the upper wall of the tank; rather, the liquid enters the upright end tanks. In this manner, more liquid appears at the end tank regions and, as a consequence, the effective center of gravity of the liquid is moved outboard with respect to the ship. Therefore, the elfective stabilizing moment is increased.
  • -It is a more particular object of the present invention to provide a tank stabilizer having upright end tanks so that, under severe roll conditions, tank liquid is not restrained by the upper surface of the stabilizing tank.
  • FIG. 1 is a side view, in section, of a passive tank stabilizer known to the prior art
  • FIG. 2 shows the tank of FIG. 1 under severe roll conditions
  • FIG. 3 is a side view, in section, of a passive tank stabilizer constructed in accordance with the present invention.
  • FIG. 4 shows the tank of FIG. 3 under severe roll conditions
  • FIG. 5 is a perspective view of a particular embodiment of the present invention.
  • FIG. 6 is a top view, in section, of the stabilizer shown in FIG. 5 and taken along line 66 of FIG. 7;
  • FIG. 7 is a view of the tank shown in FIG. 5 and taken along line 77 of FIG. 6.
  • a conventional stabilizing tank shown to be rectangular, is indicated generally at 10.
  • the tank 10 is defined by a bottom wall 12, an upper wall 14, a pair of end walls 16 and a pair of side walls (not shown).
  • the tank 10 is partially filled with a liquid, the surface of which, when the tank is level, is indicated at '18.
  • the liquid level 18 is determined by the desired resonant frequency of the tank.
  • FIG. 2 shows the tank during a roll cycle, the dynamic liquid therein defining a bore indicated at 20.
  • the bore 20 is hampered from its free flow by the upper wall 14 of the tank.
  • the height of the liquid at the right hand end Wall 16 is limited and, as a result, the center of gravity is restarined against moving outboard with respect to the ship.
  • the effective stabilizing moment generated by the tank liquid is, too, limited. This is tank saturation.
  • the tank of the present invention is shown generally at 22l and comprises a main body region defined by a bottom Wall 24, an upper wall 26, a pair of end walls 28 and a pair of side walls (not shown).
  • the tank 22 is partially filled with a liquid, the level of which is indicated at 30.
  • the size of the main body portion of the tank 22 be identical to the size of the tank 10, shown in FIGS. 1 and 2, and that the liquid level 30 associated with the tank 22 be identical to the liquid level 18 associated with the tank 10.
  • a pair of upright end tanks 32 are defined by the end walls 28 and the side walls (not shown) of the main body portion of the tank 22. [Further defining the end tanks 32 is a pair of inner walls 34 extending upwardly from the upper wall 26. The top of each tank 32 is fitted with a top Wall 36 having an opening '58 provided therein.
  • the operation of the tank 22 of the present invention will be described.
  • the liquid housed therein continuously flows from one end wall 28 to the other.
  • the moving liquid forms a bore 40.
  • the liquid in the tank 22 is not absolutely restrained by the upper wall 26. Rather, the tank liquid passes into the end tanks 32 when the roll of the ship is severe. In this manner, more liquid appears at the end regions of the stabilizing tank 22 and, as a consequence, the center of gravity associated with the volume of tank liquid is more outboard than is the case in the prior art tank illustrated in FIGS. 1 and 2. Therefore, the effective stabilizing moment associated with the tank of the present invention is substantially greater than the effective stabilizing moment associated with the tanks known to the prior art.
  • the openings 38 in the upper walls 36 of the end tanks are provided to allow the free passage of liquid into and out of the end tanks. Without the openings, or similarly operating provisions, pressure build-up would retard the free flow of liquid in the end tanks 32.
  • the tank of the present invention operates as does the prior art tank, shown in FIGS. 1 and2, under normal operating conditions.
  • the upper Walls of the tanks present no problems.
  • the passive tank stabilizer of the present invention is not plagued by the problem of tank saturation as is the tank known to the prior art.
  • the liquid flowing in the tank 22 communicates both with the main body region and the end tank regions of the system; therefore, the effective stabilizing moment generated by the tank of the present invention is substantially greater than would be if the upright end tanks were omitted.
  • the passive tank stabilizer of FIGS. 5 through 7 comprises a main body region shown generally at 50 and a pair of upright end tanks shown generally at -52.
  • the main body region '50 is defined by a tank bottom 54, a tank top 56, a pair of tank end walls 58 and a pair of tank side walls 60.
  • one of the side walls 60 is broken in such a manner that the main body portion defines a C-shaped tank. More particularly, one of the walls 60 is fitted with a second set of end walls 62 and a further side wall 64.
  • the end walls 58 extend upwardly beyond the upper wall 56 of the main body region 50. The same is true of the side walls 60. These extensions serve, in part, to define the upright end tanks 52.
  • the end tanks 52 are further delineated by a pair of vertical walls 66 extending upwardly from the upper wall '56 of the central body region 50. Each end tank 52 is covered by an upper wall 68 having an opening 70 provided therein.
  • the stabilizing tank of the present invention is provided with nozzle defining means 72.
  • the means 72 are in the form of flat vertical plates extending from the bottom 54 to the top 56 of'the main body region 50. These flat plates are rounded at their edges so as to smoothly direct the tank liquid therearound.
  • the nozzle defining means 72 sen-ve to define nozzles 74 between the central region and the end regions Of the stabilizing tank, The nozzles 74 serve the wellknown function of increasing the useful frequency range of the tank.
  • a passive free-surface tank stabilizer for reducing roll in a ship comprising: a main body region, the length of the main body region extending transverse to the length of the ship; a pair of end chambers in communication with said main body region at the extreme lengthwise ends of said main body region, said end chambers extending above said main body region; said main body region having a main tank top and a main tank bottom, said main tank top spaced from said main tank bottom by a distance whereby the main tank top is substantially above the highest liquid level to be used in said tank stabilizer; and a body of liquid partially filling said tank stabilizer, said body of liquid being of a volume less than that of said main body region so that liquid enters said end chambers only under severe conditions of roll, and of a volume wherein the frequency of liquid transfer is substantially equal to the roll frequency of the associated ship.
  • each end chamber is covered by an upper plate and wherein each upper plate has an opening provided therein.
  • a passive free-surface stabilizing tank for reducing the roll in ships comprising: a main body region Whose length lies transverse to the length of the associated ship; said main body region having a main tank top and a main tank bottom, said main tank top spaced from said main tank bottom by a distance whereby the main tank top is substantially above the highest liquid level to be used in said tank stabilizer; a body of liquid partially filling said tank stabilizer, said body of liquid being of a volume less than that of said main body region and of a volume wherein the frequency of liquid transfer is substantially equal to the roll frequency of the associated ship; and a pair of end tanks communicating with said main body region; the main body region adapted so that the liquid housed therein flows from one end of the tank to the other in response to the roll of the associated ship and the end tanks being adapted so that liquid flows thereinto only when the roll of the ship is severe.

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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)
US828609A 1969-05-28 1969-05-28 Stabilizer with upright end tanks Expired - Lifetime US3606851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82860969A 1969-05-28 1969-05-28

Publications (1)

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US3606851A true US3606851A (en) 1971-09-21

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US828609A Expired - Lifetime US3606851A (en) 1969-05-28 1969-05-28 Stabilizer with upright end tanks

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US (1) US3606851A (enrdf_load_stackoverflow)
DE (1) DE2025506B2 (enrdf_load_stackoverflow)
GB (1) GB1289011A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774567A (en) * 1971-11-26 1973-11-27 Flume Stabilization Syst U-tube stabilizer having adjustable crossover duct and end chambers
US5070663A (en) * 1988-09-08 1991-12-10 Kawasaki Jukogyo Kabushiki Kaisha Damping device for tower-like structure
US20040201153A1 (en) * 2003-04-09 2004-10-14 Yung-Hsiang Chen Propeller-controlled active tuned-liquid-column damper
US20100200348A1 (en) * 2007-09-27 2010-08-12 Michael Reiterer Liquid damper for reducing vertical and/or horizontal vibrations in a building or machine structure
CN109625194A (zh) * 2018-12-27 2019-04-16 国家海洋局第海洋研究所 一种具有减摇水舱系统的科学考察船
US11267543B2 (en) * 2016-03-02 2022-03-08 IFP Energies Nouvelles Stabilisation system, in particular for a floating support, comprising multiple u-shaped damping devices

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774567A (en) * 1971-11-26 1973-11-27 Flume Stabilization Syst U-tube stabilizer having adjustable crossover duct and end chambers
US5070663A (en) * 1988-09-08 1991-12-10 Kawasaki Jukogyo Kabushiki Kaisha Damping device for tower-like structure
US20040201153A1 (en) * 2003-04-09 2004-10-14 Yung-Hsiang Chen Propeller-controlled active tuned-liquid-column damper
US6857231B2 (en) * 2003-04-09 2005-02-22 Yung-Hsiang Chen Propeller-controlled active tuned-liquid-column damper
US20100200348A1 (en) * 2007-09-27 2010-08-12 Michael Reiterer Liquid damper for reducing vertical and/or horizontal vibrations in a building or machine structure
US11267543B2 (en) * 2016-03-02 2022-03-08 IFP Energies Nouvelles Stabilisation system, in particular for a floating support, comprising multiple u-shaped damping devices
CN109625194A (zh) * 2018-12-27 2019-04-16 国家海洋局第海洋研究所 一种具有减摇水舱系统的科学考察船
CN109625194B (zh) * 2018-12-27 2020-12-15 自然资源部第一海洋研究所 一种具有减摇水舱系统的科学考察船

Also Published As

Publication number Publication date
GB1289011A (enrdf_load_stackoverflow) 1972-09-13
DE2025506A1 (de) 1970-12-17
DE2025506B2 (de) 1971-10-21

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