EP0438787B1 - Verfahren zur Ermittlung der Stabilität von beladenen Schiffen - Google Patents

Verfahren zur Ermittlung der Stabilität von beladenen Schiffen Download PDF

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Publication number
EP0438787B1
EP0438787B1 EP90125563A EP90125563A EP0438787B1 EP 0438787 B1 EP0438787 B1 EP 0438787B1 EP 90125563 A EP90125563 A EP 90125563A EP 90125563 A EP90125563 A EP 90125563A EP 0438787 B1 EP0438787 B1 EP 0438787B1
Authority
EP
European Patent Office
Prior art keywords
vessel
values
stability
procedure
heeling
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
EP90125563A
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German (de)
English (en)
French (fr)
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EP0438787A1 (de
Inventor
Horst Halden
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.)
INTERING GmbH
Original Assignee
INTERING GmbH
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Filing date
Publication date
Application filed by INTERING GmbH filed Critical INTERING GmbH
Publication of EP0438787A1 publication Critical patent/EP0438787A1/de
Application granted granted Critical
Publication of EP0438787B1 publication Critical patent/EP0438787B1/de
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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
    • B63B39/14—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating inclination or duration of roll

Definitions

  • the invention relates to a method for determining the hydrostatic stability of ships according to the preamble of claim 1.
  • the metacentric height GM of a ship is a measure of its stability, ie the ability of the ship to withstand heeling moments. With very small angles of inclination, there is a linear relationship between the angle of inclination and the metacentric height according to the formula where M represents the moment acting on the ship, ⁇ the angle of inclination and D the displacement.
  • M represents the moment acting on the ship
  • ⁇ the angle of inclination
  • D the displacement.
  • the metacentric Height is calculated and is a typical size, as is the displacement of a ship.
  • the ship is angled up to an angle between 1 and 3 degrees.
  • a heel greater than 1 degree is necessary, because at smaller angles it is not certain whether the measurement results are still influenced by the ship's inertia.
  • the heeling test is carried out on both sides of the ship in order to identify unilateral interference.
  • the invention has for its object to provide a method for determining the stability of ships, which can be carried out in the shortest possible time. This object is achieved by the method of claims 1 and 2.
  • the method according to claim 1 makes it possible to recognize the point in time from which the ship's inertia has no influence on the measurement results. This shortens the heeling time because the heeling is canceled when the result is known. A safety margin as in the prior art is no longer necessary.
  • the method according to claim 2 allows disturbing one-sided influences to be determined as soon as the ship is turned back into the uninhibited position. In most cases, heeling to the other side of the ship can be avoided.
  • the continuously calculated values for the metacentric height are displayed in their tendency in a diagram.
  • the conveyance of the liquid and thus the change in the heeling moment is stopped as soon as the values for the metacentric height are approximately constant over a predetermined time.
  • the method according to the invention takes advantage of the fact known per se that there is a linear relationship between heeling angle and heeling moment in the area of small heeling angles. If the values for the metacentric height are displayed in a diagram, the result is After a certain transition behavior, a constant is the end value that should be above the minimum value for the metacentric height prescribed by the authorities. The prescribed minimum value is shown as a straight line in this diagram. If a final value for the measured metacentric height approaches this minimum value or falls below it, a warning signal is preferably generated.
  • the skipper can also determine in accordance with the method of claim 2 when turning the ship back into the uninhibited position, whether the attempt has been falsified by one-way interference. Is this if not, the heeling attempt can be ended now. The trial period is then particularly short. In the other case, the heeling attempt is continued to the other side. The test time is shortened according to the method of claim 1.
  • the test moment can be determined by determining the amount of liquid present in a tank of the tank system by means of a level measurement, preferably in one embodiment of the invention based on the principle of sound measurement.
  • a sound measurement can only determine the distance of the liquid level from the sensor, but corrective factors can be determined with the inclination measured by the heeling meter and the geometry of the tank, so that the amount of liquid in a tank and thus the test moment can be determined with sufficient accuracy can be.
  • the ships are increasingly equipped with a device with which the respective displacement can be determined. From the continuously measured values of the heel angle and the displacement and the continuously calculated values of the heeling moment, the values for the metacentric height can therefore also be continuously calculated.
  • the values for the metacentric height for one ship side are compared with the values for the other ship side and a warning signal is generated if the values differ from one another.
  • the liquid is conveyed using compressed air.
  • An alternative embodiment provides that the liquid is conveyed by means of pumps.
  • a quantity measurement can take place in parallel according to one embodiment of the invention.
  • the amount of liquid flowing through the channel between the sides of the tank is a measure of the amount on each side.
  • the heeling torque values obtained in this way can be compared with the values determined by the level measurement. If there is a certain deviation, a check can be made the accuracy of the level measurement system.
  • a level measurement can also be carried out simultaneously for both sides of the tank.
  • the quantity supplied to one tank section must correspond to the decrease in the other tank section. This also allows the function of the level measuring device to be checked.
  • the U-shaped tank system 10 shown in FIG. 1 consists of the tanks 12 and 14, which are connected to one another via at least one channel 16. There is water 18 in the tank system 10. With the aid of a blower 20, which is connected to the tanks 12, 14 via a valve arrangement 22, one tank 12, 14 can be pressurized and the other vented, so that the ship has a moment experienced about its longitudinal axis. This is indicated by the dashed level.
  • Sensors 26, 28 operating on the principle of sound measurement measure the level in the tanks 12, 14 and pass the signals to a measuring system 30.
  • the measuring system outputs the level measurement to a computer 32.
  • An inclinometer 34 determines the respective heeling angle ⁇ and gives it up the computer 32.
  • a draft measurement system 36 measures the respective draft and also sends the corresponding values to the computer 32.
  • a volume flow meter 38 in the channel 16 determines the volume flow flowing through the channel 16 and outputs the determined values to the computer 32.
  • Fig. 2 the heeling moment M1, the heeling angle ⁇ , GM ' min and GM' is plotted over time. Because of the ship's inertia, there is a phase shift between heeling moment M and heeling angle ⁇ at the beginning of heeling. As long as the phase shift continues, the calculated GM 'is faulty, which is shown in the diagram by the fact that the GM' curve indicates values that are too high. If the heeling moment is so large that the ship's inertia no longer has an effect on the measurement result, the GM 'curve runs asymptotically in a straight line. At this time t2 the heel can be canceled.
  • the heeling moment M, the heeling angle ⁇ , GM min and GM ' is also plotted over time in FIG. 3. Up to the time t2, at which the heeling is ended on one side, Figures 2 and 3 are identical. After a certain settling phase from the time t2 to t3, in the heeling moment M and heeling angle ⁇ are constant, the determination of the values GM 'for the turning back of the ship from the heeled to the uncrowned position begins at the time t3. The values GM 'from the heeling and turning back are identical. The heeling attempt is ended at time t4. Heeling to the other side of the ship is no longer necessary.
  • the constant values GM ' are at the same height for both sides of the ship. This is not the case with the representation according to FIG. 4. It can be seen that the values GM 'of the first curve are higher than those of the second curve. This means that there are any disturbance variables on the ship that affect the heeling attempt.
  • the values for the first and second curves are compared with one another and can be made known via a display or alarm device, not shown, so that the interference is eliminated. It can also be seen from the second curve for the stability values in FIG. 4 that no constant straight line is obtained, but that there are certain fluctuations. Such fluctuations can be caused by gusts of wind, for example.
  • the diagrams or individual values can be printed out via a printer 44.
  • the volume flow meter 38 can also be used to determine the amount of liquid in each of the tanks 12, 14.
  • the values determined with the volumetric flow meter and the fill level meter are likewise entered into the computer 32 and compared with one another to check the correct functioning of the fill level measuring system 26, 28, 30 for the tanks 12, 14.
  • the ship's captain can end the experiment at time t4, since disturbance variables which impair the determination of GM' obviously do not exist.
  • the duration of the experiment is particularly short then. If there are deviations in the values for GM 'after returning to the angle of inclination 0, as shown in FIG. 4, a longer test period is necessary, ie a heeling test with an inclination of the ship to the other side is also necessary.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Steroid Compounds (AREA)
EP90125563A 1990-01-24 1990-12-27 Verfahren zur Ermittlung der Stabilität von beladenen Schiffen Expired - Lifetime EP0438787B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002028A DE4002028A1 (de) 1990-01-24 1990-01-24 Verfahren zur ermittlung der stabilitaet von beladenen schiffen
DE4002028 1990-01-24

Publications (2)

Publication Number Publication Date
EP0438787A1 EP0438787A1 (de) 1991-07-31
EP0438787B1 true EP0438787B1 (de) 1994-06-08

Family

ID=6398685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125563A Expired - Lifetime EP0438787B1 (de) 1990-01-24 1990-12-27 Verfahren zur Ermittlung der Stabilität von beladenen Schiffen

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EP (1) EP0438787B1 (enrdf_load_html_response)
AT (1) ATE106816T1 (enrdf_load_html_response)
DE (2) DE4002028A1 (enrdf_load_html_response)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10355052B4 (de) * 2003-07-19 2006-11-02 Dallach, Gert, Dr. Ing. Stabilitätsbestimmung von Schiffen
NL1029533C2 (nl) * 2004-07-15 2006-01-18 Hein Douwinus Voskamp Drijfbare constructie.
EP1616784B1 (en) * 2004-07-15 2008-03-12 Hein Douwinus Voskamp Floatable construction
NL1033904C2 (nl) * 2007-05-29 2008-12-02 Sygo B V Werkwijze voor het bepalen van een parameter die een stabiliteit van een schip representeert en systeem voor het uitvoeren van een dergelijke werkwijze.
RU2440912C1 (ru) * 2010-06-15 2012-01-27 Федеральное государственное унитарное предприятие "Центральный научно-исследовательский институт имени академика А.Н. Крылова" (ФГУП "ЦНИИ им. акад. А.Н. Крылова") Устройство для измерения угла крена или дифферента плавучего средства на волнении
RU2522671C1 (ru) * 2012-12-17 2014-07-20 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Автоматизированная система кренования судна
CN108909965A (zh) * 2018-08-24 2018-11-30 中国卫星海上测控部 船舶减摇兼抗倾水舱
CN115009461B (zh) * 2022-06-07 2024-03-29 中国船级社 越障型遥控倾斜试验装置及方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872118A (en) * 1984-08-09 1989-10-03 Naidenov Evgeny V System for automated monitoring of trim and stability of a vessel
EP0197922A1 (en) * 1984-10-15 1986-10-22 Aker Engineering A/S A method and a system for determining the stability of a floating body
GB8521702D0 (en) * 1985-08-31 1985-10-02 British Petroleum Co Plc Determination of stability of floating structures

Also Published As

Publication number Publication date
EP0438787A1 (de) 1991-07-31
ATE106816T1 (de) 1994-06-15
DE4002028A1 (de) 1991-07-25
DE59006051D1 (de) 1994-07-14
DE4002028C2 (enrdf_load_html_response) 1993-08-12

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