US3557735A - Moving weight ship stabilizer - Google Patents

Moving weight ship stabilizer Download PDF

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Publication number
US3557735A
US3557735A US748043A US3557735DA US3557735A US 3557735 A US3557735 A US 3557735A US 748043 A US748043 A US 748043A US 3557735D A US3557735D A US 3557735DA US 3557735 A US3557735 A US 3557735A
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United States
Prior art keywords
ship
stabilizer
cylinder
cylindrical member
roll
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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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US748043A
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English (en)
Inventor
Edward D Dreyfus
Paul A Brunsell
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FLUME STABILIZATION SYSTEMS Inc
FLUME STABILIZATION SYST
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FLUME STABILIZATION SYST
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Application filed by FLUME STABILIZATION SYST filed Critical FLUME STABILIZATION SYST
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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 moving weight stabilization systems for ships and more particularly to such a system including a moving weight in the form of rolling cylindrical member guided to roll athwartship in response to the rolling motion of the ship.
  • Moving weight stabilizers which include a track mounted carriage including a significant weight or mass block, for example 25 tons or more, arranged on wheels which in response to the roll of the ship translates from one side of the ship toward the other.
  • a track mounted carriage including a significant weight or mass block, for example 25 tons or more, arranged on wheels which in response to the roll of the ship translates from one side of the ship toward the other.
  • these conventional systems usually experience a serious phasing problem the solution of which, in one example, includes a complicated braking mechanism requiring an electronic roll sensing brake actuation device.
  • the weight is guided by a rail and travels on a floor which is preferably inclined upward from the center region of the tank to diminish the kenetic energy of the weight as it travels outboard.
  • liquid is contained within the path through which the cylinder rolls to dampen and dissipate kinetic energy during operation.
  • the weight cylinder is of hollow construction and incorporates a liquid body filled to a level to effectively determine the mass and consequently the timing or amplitude of the weight movement. If further energy dissipation is required, members may be formed within the hollow cylinder that rotate through the liquid body in order to dampen rotation and translation of the cylinder weight.
  • FIG. 1 is a diagrammatic illustration of a transverse section through a ship embodying the stabilizing system according to the invention. The ship and system is depicted in a steady state stabilized condition.
  • FIGS. 2-5 are illustrations similar to FIG. 1 in which the ship and system are illustrated in various parts of the roll cycle.
  • FIG. 6 is a transverse section relative to the ship illustrating the stabilization system according to the invention.
  • FIG. 7 is a longitudinal section relative to the ship taken along line 77 of FIG. 6.
  • FIG. 8 is similar to FIG. 6 illustrating a second embodiment of the invention.
  • FIG. 9 is a longitudinal sectional relative to the ship taken along line 9-9 of FIG. 8.
  • FIGS. 1 through 5 there is depicted a typical ship 10 on which the stabilization system 12 according to the invention is arranged to impart stabilizing moments to the vessel in opposition to roll.
  • the moving weight system 12 may be arranged on the main deck as shown or in the double bottom or between any decks of the ship 12 to suit the space and stability characteristics of the ship.
  • System 12 includes an enclosed and elongated enclosure or housing 14 extending athwartships and arranged symmetrically with the longitudinal center line of the ship.
  • the moving weight is in the form of a rolling cylindrical member 16 guided within housing 14 to roll athwartships in response to the rolling action of ship 10.
  • Cylinder 16 is designed such that its radius of gyration is related to the cylinder mass to cause a cylinder translation of a predetermined distance when the ship rolls at its natural frequency.
  • the bottom surface on which cylinder 16 travels is flat near the center and is inclined outboard at least near the extremities of housing 14 and means are provided within the housing to dampen the rolling action of cylinder 16 or dissipate the kinetic energy therefrom.
  • the athwartship travel distance provided cylinder 16 and the radius of gyration of cylinder 16 and amount of damping imparted thereto during each ship rolling cycle should be related to each other so that the weight generally assumes the positions indicated in FIGS. 2 through 5 during the steady state rolling condition of the ship.
  • the cylinder position should lag approximately behind the rolling of the ship, that is, when the ship is at its maximum roll amplitude cylinder 16 should be at or near the center line of the ship and when the ship is approximately horizontal rolling with maximum velocity, cylinder 16 should be near the system end wall imparting a moment to the ship in opposition to the roll.
  • one embodiment of the system 12 includes a solid cylinder 16 having a pair of enlarged cylindrical parts 18 connected by a center shaft 20 of smaller diameter. Parts 18 straddle a reinforced guide rail 22 which extends the athwartship dimension of housing 14. Guide rail 22 maintains the direction of roll of the cylinders 16 in the transverse plane notwithstanding pitching, yawing, or
  • cylindrical member may have any one of a number of suitable configurations to determine the desired parameters of the system and that the configuration illustrated is by way of example.
  • the cylinder 16 rolls on the bottom surface of housing 14 which is inclined upward at the outboard extremities to an angle of approximately 5 to 10.
  • the end walls 24 of housing 14 should be sufficiently reinforced to withstand undesirable impact imparted by cylinder 16. To lessen any shock forces experienced thereby a suitable energy absorber is provided such as a spring biased bumper plate 26.
  • housing 14 is partially filled with a body of liquid 28 through which cylinder 16 rolls in response to the rolling of the ship.
  • Liquid 28 does not appreciably change the metacentric height of the ship due to the shallow liquid level which may be in the order of l to 3 feet. For this reason also, liquid 28 does not appreciably destabilize the ship.
  • Any suitable liquid may be selected such as fresh water, sea water, bunker oil, or the like. In the case of oil or other lubricants, cylinder slipping may be encountered but this may be beneficial to the operational efficiency.
  • cylinder 16 rolls within housing 14 in response to the rolling of the ship to impart a stabilizing moment as indicated in FIGS. 2 through 5.
  • the rolling action of cylinder 16 is dampened as the weight transfers through the liquid body 28.
  • the amount of damping imparted to weight 16 may be varied by changing the liquid level within housing 14 to maintain the desired cylinder phase lag. In some cases, particularly in short period ships, it is anticipated that no damping liquid in the housing will be preferable.
  • FIGS. 8 and 9 Another embodiment of the invention is illustrated in FIGS. 8 and 9 wherein cylinder 17 includes a hollow body partially filled with liquid 30 and including a plurality of internal fins 32 which continuously pass through and churn liquid 30 as cylinder 17 rolls on track 22.
  • the liquid may be added or drained via normally closed ports 19.
  • liquid 30 may be of any suitable type and heavy liquids such as mercury or solid-liquid suspensions may be preferred.
  • the cylinder supporting floor of housing 14 upon which cylinder 16 rolls should be inclined towards the outboard extremities.
  • the rolling surface levels off at the outboard end as indicated at 33.
  • FIGS. 8 and 9 The operation of the embodiment of FIGS. 8 and 9 is essentially the same as that of the first described embodiment with the exception that the cylinder 16 carries the damping liquid within. If desired, the surface upon which cylinder 16 rolls may be the same as that depicted in FIG. 6.
  • the system has the following approximate parameters at resonance for a ship of 16,000 tons displacement, beam 78.0 ft. rolling period of 20 seconds, gm of 2.50 ft.:
  • a passive moving weight roll stabilizer for ships comprising a freely rolling cylindrical member of sufficient mass to impart a significant stabilization moment or force to the ship, a guide track rigidly secured to a deck of the ship, said cylinder arranged on the guide track to roll athwartship in direct response to the rolling action of the ship, and means to slow or impede the lateral movement of the cylinder at least at a predetermined distance on either side of the ships centerline in order to maintain a proper stabilizing phase lag between the roll of the ship and the roll of the cylinder.
  • a moving weight roll stabilizer for ships comprising a cylindrical member of sufficient mass to impart a significant stabilization moment or force to the ship, said cylinder arranged on the ship to roll athwartship in response to the rolling action of the ship, means to slow or impede the lateral movement of the cylinder at least at a predetermined distance on either side of the ships center line, and guide means to maintain the cylindrical member movement athwartships, wherein the guide means comprises the cylindrical member having a part with a reduced diameter and a transverse guide rail mounted to the ship and cooperating with said part.
  • a moving weight roll stabilizer for ships comprising a cylindrical member of sufficient mass to impart a significant stabilization moment or force to the ship, said cylinder arranged on the ship to roll athwartship in response to the rolling action of the ship, and means to slow or impede the lateral movementpf the cylinder at least at a predetermined distance on either side of the ships center line, wherein the cylinder is hollow and its internal cavity is partially filled with liquid.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Vibration Prevention Devices (AREA)
US748043A 1968-07-26 1968-07-26 Moving weight ship stabilizer Expired - Lifetime US3557735A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74804368A 1968-07-26 1968-07-26

Publications (1)

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US3557735A true US3557735A (en) 1971-01-26

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US748043A Expired - Lifetime US3557735A (en) 1968-07-26 1968-07-26 Moving weight ship stabilizer

Country Status (5)

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US (1) US3557735A (enrdf_load_stackoverflow)
DE (1) DE1937956B2 (enrdf_load_stackoverflow)
GB (1) GB1260172A (enrdf_load_stackoverflow)
NO (2) NO126009B (enrdf_load_stackoverflow)
SE (1) SE360830B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804050A (en) * 1971-10-21 1974-04-16 Exxon Research Engineering Co Permanent ballast arrangement for externally insulated tankers
US3809000A (en) * 1971-08-04 1974-05-07 Secretary Trade Ind Brit Passive roll stabilisers
US3934535A (en) * 1973-05-15 1976-01-27 Southwestern Industries, Inc. Roll stabilizer for a boat
US5816871A (en) * 1993-12-06 1998-10-06 Proverbio; Rodolphe Muscle-powered watercraft
WO2008135227A1 (de) * 2007-05-07 2008-11-13 Thiede Bjoern Bewegbares ballastgewicht für segelschiffe
US20090158983A1 (en) * 2006-04-07 2009-06-25 Robert William Gale Yacht and Ballast Assembly Therefor
US20100307401A1 (en) * 2007-10-11 2010-12-09 Itrec B.V. Vessels with roll damping mechanism
US20110129329A1 (en) * 2009-11-27 2011-06-02 Sany Electric Co., Ltd. Wind turbine installation vessel and a gravity center adjustment device thereof
CN108569382A (zh) * 2018-04-28 2018-09-25 江阴市北海救生设备有限公司 设有纵倾角调节机构的船艇

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111290416B (zh) * 2020-01-20 2020-11-20 郑州宇通重工有限公司 船只姿态控制方法、系统、计算机存储介质和船只

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE324970C (de) * 1915-08-12 1920-09-07 Hamburg Und Stettin Act Ges Verfahren zum Daempfen schwingender Bewegungen von Koerpern, insbesondere der Rollbewegungen von Schiffen
US3083671A (en) * 1960-10-25 1963-04-02 Mcmullen Ass John J Vessel stabilization system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE324970C (de) * 1915-08-12 1920-09-07 Hamburg Und Stettin Act Ges Verfahren zum Daempfen schwingender Bewegungen von Koerpern, insbesondere der Rollbewegungen von Schiffen
US3083671A (en) * 1960-10-25 1963-04-02 Mcmullen Ass John J Vessel stabilization system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809000A (en) * 1971-08-04 1974-05-07 Secretary Trade Ind Brit Passive roll stabilisers
US3804050A (en) * 1971-10-21 1974-04-16 Exxon Research Engineering Co Permanent ballast arrangement for externally insulated tankers
US3934535A (en) * 1973-05-15 1976-01-27 Southwestern Industries, Inc. Roll stabilizer for a boat
US5816871A (en) * 1993-12-06 1998-10-06 Proverbio; Rodolphe Muscle-powered watercraft
US20090158983A1 (en) * 2006-04-07 2009-06-25 Robert William Gale Yacht and Ballast Assembly Therefor
US7849809B2 (en) * 2006-04-07 2010-12-14 Robert William Gale Yacht and ballast assembly therefor
WO2008135227A1 (de) * 2007-05-07 2008-11-13 Thiede Bjoern Bewegbares ballastgewicht für segelschiffe
US20100307401A1 (en) * 2007-10-11 2010-12-09 Itrec B.V. Vessels with roll damping mechanism
US20110129329A1 (en) * 2009-11-27 2011-06-02 Sany Electric Co., Ltd. Wind turbine installation vessel and a gravity center adjustment device thereof
CN108569382A (zh) * 2018-04-28 2018-09-25 江阴市北海救生设备有限公司 设有纵倾角调节机构的船艇

Also Published As

Publication number Publication date
NO126009B (enrdf_load_stackoverflow) 1972-12-11
NO127850B (enrdf_load_stackoverflow) 1973-08-27
GB1260172A (en) 1972-01-12
DE1937956A1 (de) 1970-01-29
SE360830B (enrdf_load_stackoverflow) 1973-10-08
DE1937956B2 (de) 1971-11-18

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