US3128375A - Apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded ship - Google Patents

Apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded ship Download PDF

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US3128375A
US3128375A US21797A US2179760A US3128375A US 3128375 A US3128375 A US 3128375A US 21797 A US21797 A US 21797A US 2179760 A US2179760 A US 2179760A US 3128375 A US3128375 A US 3128375A
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signal
representing
trim
section
moment
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Grimnes Knut
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Sintef AS
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Sintef AS
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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
    • B63B39/12—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating draught or load
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
    • G06G7/68—Analogue computers for specific processes, systems or devices, e.g. simulators for civil engineering structures, e.g. beam, strut, girder, elasticity computation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/48—Analogue computers for specific processes, systems or devices, e.g. simulators
    • G06G7/70—Analogue computers for specific processes, systems or devices, e.g. simulators for vehicles, e.g. to determine permissible loading of ships, centre of gravity, necessary fuel

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  • the apparatus of the invention has been designed as an electric analog computer incorporating a number of sections (called apparatus sections) equivalent to a number of sections (called ships sections) into which it is assumed that the ship has been divided.
  • the apparatus is based on the principle that in each apparatus section there can be obtained, by using fixed and adjustable resistors, a current (hereinafter called weight current) and a voltage (hereinafter called weight voltage), both being proportional to the arithmetic sum (hereinafter called resultant weight) of the buoyancy, carrying load and weight of the corresponding section of the ship.
  • FIGURE 1 is a longitudinal section diagram of a ship divided into eight sections
  • FIGURES 2 and 3 are circuit diagrams
  • FIGURE 4 is a perspective view of an apparatus according to the invention.
  • FIGURE 5 is a wiring diagram of the apparatus
  • FIGURE 6 is a modified circuit diagram.
  • FIGURE 1 The basis for the design of the apparatus will be explained with reference to FIGURE 1, in which eight sections of a ship are designated 18.
  • the depth of the ship midship is called D and the angle of trim T.
  • the trim angle T is given in radians or, because it is generally very small, in tangents.
  • An arbitrary section of the ship will, in addition to the shearing stress and the bending moment acting in the sectional planes between the said section and adjacent sections be exposed to the following forces:
  • the weight of the section (i) is a constant for each section.
  • the load in the section (ii) represents an arbitrary variable figure.
  • the buoyancy of the section (iii) is equal to the sum of two products, (a) the product of a constant buoyancy factor for each section and the depth midship, and (b) product of T, the distance from the section to midship and the buoyancy factor.
  • the depth midship D is a variable common for all sections and independent of the load distribution.
  • T is a variable, common for all sections, but depending upon the load distribution.
  • the resultant weight F for each section is equal to the arithmetic sum of the weight of the section, its load and its buoyancy. When the ship is floating and in a static balance condition, the arithmetic sum of the resultant weights of all the sections of the ship equals 0. This can be expressed by the following equation:
  • Equation 2 the distance K varies with T and can be disregarded in Equation 2.
  • Equation 1 and 2 are according to the invention the basis for finding D and T respectively.
  • x is positive towards the right hand side.
  • x is the distance from the point of application of the resultant weight F, to the sectional plane A.
  • the following equation is used in order to determine the shearing stress S in the intersection between two sections 11 and n+1:
  • the load is an independent variable which is not influenced by the depth or the trim of the ship, and can therefore be represented by a current obtained either by using a constant voltage which can be common for every apparatus section and a variableresistor or by means of a fixed resistor and a variable voltage.
  • the weight of the ships sections is a constant figure and can be represented by a constant current, for instance obtained by using a voltage constant for every apparatus section and constant resistors one for each apparatus section.
  • the buoyancy of the ships section can as previously explained, be regarded as the sum of the two products (a) and (b).
  • the buoyancy of the ships section can therefore be represented by a sum of two currents.
  • the variable factors D and T are common for all apparatus sections, two variable voltages common for all apparatus sections can advantageously be used, each voltage being in combination with a resistor for each apparatus sections based upon buoyancy factor and the distance from midship of each corresponding ships section.
  • FIGURE 2 Such a Wiring scheme for apparatus section 1 is shown in FIGURE 2.
  • +e and e are constant voltages
  • e is a voltage which can be adjusted, for instance by using a potentiometer, so that it is proportional to D; this will be hereinafter explained.
  • e is a voltage which can be adjusted so that it is proportional to T. All these voltages except 8T are common for all apparatus sections; e is of the same numerical value for each apparatus section, but is of opposite polarity for apparatus sections corresponding respectively forward of or aft midship.
  • P is a variable resistor adapted to be adjusted according to the load in the ships section.
  • R is a constant resistor.
  • the resistors P R and R are so adjusted in relation to each other and taking into account the characteristic data for the ships section in question, that the sum of the currents i and i (which are opposite due to the opposite polarity of the voltages +2 and e equals the weight of the section when the variable resistor is adjusted to maximum value (no load).
  • resistors P (or P +R and R can theoretically be combined, but this has proved to be ineffective in practice.
  • R is given such a value that the current i corresponds to the products of D (voltage 2 and the buoyancy factor of the ships section.
  • R is given such a value that the current 1' corresponds to the product of T (voltage o the buoyancy factor of the ships section and the distance of the section from midship.
  • R is finally a constant resistor of a small value compared with the previously mentioned resistor. The current 1' as well as the voltage a over the resistor R will through this circuit be proportional to the resultant weight of the ships section.
  • Equation 1 it follows that by a correct adjustment of e the sum of currents 1' 1' to iog will be 0. This will be the case substantially independent of T, i.e. substantially independent of e which can therefore be adjusted to an arbitrary value. Therefore, if the voltage a is adjusted, for instance by using a potentiometer until the sum of currents i 1' which can be read on a galvanomet'er, equals then the voltage ca is correctly adjusted and D can be read on the potentiometer.
  • Equation 2 In order to adjust e to its correct value, Equation 2 is used. When doing this, use is further made of the voltages e as shown in FIGURE 3.
  • R Rm designate constant resistors of such a value that its reciprocal value :(the conductivity) l/R for a certain apparatus section is proportional to the distance from the sectional plane in which one wants to calculate the bending moment to that particular ships section.
  • FIGURES 1-5 designate corresponding quantities and parts.
  • FIGURE 5 shows the wiring for a calculating apparatus for a ship split into eight sections and where the shearing stress can be measured in two sectional planes and the bending moment in two sectional planes.
  • the apparatus includes a series of resistors (R) and potentiometers or adjustable resistors (P), two switches (S and M) and two galvanometers (A).
  • FIG. 5 is split into three areas, as indicated with dot and dash lines, one for a weight unit (area B, C, D, B), one for a moment unit (area C, D, F, G) and one for a control unit (area H, B, G, K).
  • the adjustable resistor in the first set of resistors is shown as a single adjustable resistor P If there is more than one tank in a ships section, for instance three, there is preferably provided one adjustable resistor for each tank, for instance (P P P and it is the parallel resistance of these resistors which equals P in FIGURE 2.
  • the moment unit includes a switch M with nine poles M M and a number of resistors.
  • the resistors R R R are used by calculating the trim, as described above in connection with FIGURE 3.
  • Each of these resistors is of such a value that the conductivity (l/R of the resistors is proportional to the distance from one end of the ship to the section designated with the ciper of the resistor.
  • the switch M is adjusted to measurement of trim. The pole M is disconnected in this position.
  • resistors R R R and R are provided in order to measure the bending moment in sectional plane A (FIGURE 1) resistors R R R and R are provided. These resistors are connected if the switch is moved one step clockwise. Then only resistors for the sections between sectional plane A and one end of the ship are connected and the current through instrument A will be proportional to the bending moment in the sectional plane A. In the embodiment shown the bending moment will not be read on the instrument A but on the potentiometer P by means of which a current is applied through the pole M which current can be adjusted so that instrument A shows 0. The current applied will then be of numerical value, but of opposite polarity to that which could be read on A and is therefore proportional to the bending moment in the sectional plane in question.
  • the resistors R R and R are connected corresponding to the measurement of bending moment in sectional plane B (FIGURE 1). It is understood that the resistors R and R have such values that the conductivity of a resistor (for instance R is proportional to the distance from the section (in the example section 7) indicated by the cipher index of the resistor to the sectional plane indicated by the letter index (in the example sectional plane A).
  • the control unit consists of a voltage divider R --R which is connected to two leads 11 and 12 and four potentiometers P P P and P the position of which gives respectively depth, trim, shearing stress and bending moment.
  • the voltage divider consists of two equal resistors R and gives a voltage 2 which is the zero point for the voltages in the apparatus. This makes the voltages +e and e numericaly equal, but of opposite polarity. This is of course only absolutely true as long as there is no current in the lead from the middle point of the voltage divider. Inasmuch as all the measurements are made in such a way that both A and A shall show 0 (or very close to 0), there should be no current in this lead when measuring and that s is therefore really half way between +e and e (or in any case within certain limits of tolerance).
  • the potentiometer P -P for trim is a double potentiometer, from which one obtains the two voltages e and e which are numerically equal, but of opposite polarity. One voltage is used for all the sections abaft midship, and the other for all sections forward of midship.
  • Potentiometers P for shearing stress and P for bending moment supply a current, the value of which depends upon the adjustment. This is possible because they are adjusted until instruments A or A show 0 (respectively for: shearing stress and bending moment). The voltagedrop over the respective amperemeter is then 0 and the voltage on the slider of the potentiometer equals e (:0).
  • the circuit is in fact a bridge circuit, but it is easier to regard it as hereinbefore shown, because the analogy between the electrical and mechanical values is more apparent.
  • a variable resistor is provided for each apparatus section (for instance P for the first section), the said resistor being adapted to be adjusted corresponding to a load to be carried in the corresponding section of the ship. It is provided with a constant resistor (for instance R in series with the variable resistor. These resistors are connected to a constant potential (for instance +2 For the same section of the apparatus there is further provided a constant resistor (for instance R the value of which is selected corresponding to the own weight of the corresponding section of the ship. This resistor is connected to a constant potential (for instance e being of opposite polarity, but of the same numerical value as the constant potential (+e mentioned above.
  • resistors R and R are so dimensioned that the arithmetical sum of the currents (i and 1' respectively) being obtained through resistors (R or R respectively) corresponds to the weight of the section of the ship when the variable resistor P is set to maximal value.
  • FIGURE 6 shows a modification of the coupling here:
  • F designates a potentiomenter one end of which is connected to a point having a constant voltage +e and the other end is connected to zero potential.
  • the voltage 2 can be adiusted on any value from O to +e
  • the voltage e is applied across a resistor R and a current i' is obtained which can be adjusted from zero to a maximum value corresponding to the weight of the carrying load in the corresponding section of the ship.
  • R' is a constant resistor of such a value that the current 1". will correspond to the own weight of the section of the ship.
  • the resistor R according to FIG- URES 2 and 5 is connected to the voltage e is the resistor R' according to FIGURE 6 connected to the plus pole of the apparatus, that is the voltage +2
  • the coupling is the same as shown in FIG- URES 2 and 5, and the designations e e R 1, R i 1' e i and R on the drawing designate corresponding voltages resistance and currents as the same designations in the other figures.
  • each elementary computing means comprising a Weightsignal-generating circuit and a buoyancy-force-signalgenerating circuit, the weight-signal-generating circuit including manually adjustable means settable in accordance with an associated scale means representing weight and operative to control the output of the first signal-generating circuit to provide an output current proportional to the sum of the weight of the corresponding section and the proposed load to be placed in it as indicated on the scale means, and the buoyancy-force-signal-generating circuit having first and second input channels and being operative to produce an output signal that is the sum of a first component output signal that is proportional to a first input signal applied to the first input channel with a gain representative of a predetermined buoyancy factor for the corresponding section and of a second component output signal that is proportion
  • An electrical analog computing apparatus for a ship for calculating the draught, the trim in the pitch plane, and the bending moment at a first predetermined transverse plane for a proposed manner of loading comprising a first potentiometer means adjustable to produce a voltage in accordance with the adjustment so made to be used in the apparatus as a draught-representing voltage, a second potentiometer means adjustable to produce a voltage in accordance with the adjustment so made to be used in the apparatus as a trim-representing voltage, a plurality of elementary computing means, one for each of a corresponding plurality of sections into which the ship is assumed to be divided, each elementary computing means comprising a weight-signal generating circuit and a buoyancy-force-signal-generating circuit, the weightsignal-generating circuit including manually settable means settable in accordance with an associated scale means representing weight and being operative to control the output of the weight-signal-generating circuit to provide an output current proportional to the sum of the weight of the corresponding section and the proposed load to be placed in it
  • each manually settable means includes a plurality of settable knobs, one for each compartment, and each having a scale representing weight.
  • Apparatus as claimed in claim 2 including potentiometer means settable by means of a knob having a scale representing bending moment to produce a voltage corresponding to the setting so made, said second switch means being efiective to connect the output of the potentiometer means to produce a current in the second summing means when the latter is connected to receive the currents through the fifth resistances, whereby if the knob is adjusted to cause the second summing means to indicate zero, the knob indicates with respect to the scale the bending moment at the predetermined plane.
  • Apparatus as claimed in claim 2 for calculating the ending moment at a plurality of predetermined transverse planes, wherein the number of said fifth resistances correspond to the number of predetermined transverse planes to one side of the corresponding sections, and each having a fixed value inversely proportional to the distance of the corresponding section from the corresponding transverse plane, said second switch means being selectively operable to connect the voltages across the third resistances of those elementary computing means corresponding to those sections to one side of a selected one of the predetermined transverse planes to energize respectively those fifth resistances having fixed values inversely proportional to the distances of the sections from the selected transverse plane, and simultaneously to connect the currents through the selected fifth resistances to the second current-summing means to provide an indicated measures of the algebraic sum of the currents.
  • An electrical analog computing apparatus for a ship for calculating the draught, the trim in the pitch plane, the bending moment at a predetermined transverse plane, and the shear force at a predetermined transverse plane, for a proposed manner of loading comprising a first potentiometer means adjustable to produce a voltage in accordance with the adjustment so made to be used in the apparatus as a draught-representing voltage, a second potentiometer means adjustable to produce a voltage in accordance with the adjustment so made, to be used in the apparatus as a trim-representing voltage, a plurality of elementary computing means, one for each of a corresponding plurality of sections into which the ship is assumed to be divided, each elementary computing means comprising a weight-signal-generating circuit and a buoyancy-force-signal-generating circuit, the weight-signal generating circuit including manually settable means settable in accordance with an associated scale means rep resenting weight and being operative to control the output of the weight-signal-generating circuit to provide an output current proportional to
  • each manually settable means includes a plurality of settable knobs, one for each compartment, and each having a scale representing weight.
  • Apparatus as claimed in claim 6 including a third potentiometer means settable by means of a knob having a scale representing bending moment to produce a voltage corresponding to the setting so made, said second switch means being effective to connect the output of the third potentiometer means to produce a current in the second summing means when the latter is connected to receive the currents through the fifth resistances, whereby, if the knob is adjusted to cause the summing means to indicate zero, the knob indicates with respect to the scale the bending moment at the predetermined plane, and a fourth potentiometer means settable by means of a knob having a scale representing shear force to produce a voltage corresponding to the setting so made, said first switch means being effective to connect the output of the fourth potentiometer means to produce a current in the first summing means when the latter is connected to receive the currents through the third resistances of those elementary computing means corresponding to those sections to one side of the transverse plane the bending moment at which is to be computed, whereby if the knob is adjusted to cause
  • Apparatus as claimed in claim 6 for calculating the bending moment at a plurality of predetermined transverse planes, wherein the number of said fifth resistances correspond to the number of predetermined transverse planes to one side of the corresponding sections, and each having a fixed value inversely proportional to the distance of the corresponding section from the corresponding transverse plane, said second switch means being selectively operable to connect the voltages across the third resistances of those elementary computing means corresponding to those sections to one side of a selected one of the predetermined transverse planes to energize respectively those fifth resistances having fixed values inversely proportional to the distances of the sections from the selected transverse plane, and simultaneously to connect the currents through the selected fifth resistances to the second current-summing means to provide an indicated measure of the algebraic sum of the currents, and for also calculating the shear force at a plurality of predetermined transverse planes wherein said first switch means is selectively operable to connect the currents through the third resistances of those elementary computing means corresponding to those sections to one side of any
  • an elementary computing means for each of a plurality of sections into which the ship is assumed to be divided for computing a measure of the algebraic sum of measures of the weight of the corresponding section, the load to be placed in the section, and the buoyancy force that should act on the section for the proposed manner of loading, comprising means operable to produce a current having two components, one of constant magnitude representing the weight of the section and the other of variable magnitude representing the weight of the load to be placed in the section, adjustable means for varying the magnitude of the second component in accordance with the load to be placed in the section, means operable to produce a current representing the product of the measure of the draught of the ship and a factor dependent on the buoyancy characteristics of the section, means operable to provide a current representing the product of the measure of the measure of the
  • An electrical analog computer apparatus for a ship for calculating the draught, the trim, and the bending moment at a predetermined transverse plane that the ship should have for a proposed manner of loading comprising a first settable signal-generating means settable in association with a scale representing draught to produce an electrical signal representative of the value of draught indicated by the scale, a second settable signal-generating means settable in association with a scale representing trim to produce an electrical signal representative of the value of trim indicated by the scale, a plurality of elementary computing means, one for each of a correspondmg plurality of sections into which the ship is assumed to be divided, each elementary computing means comprising an elementary unbalance-force computing circuit having at least one electrical component adjustable in accordance with the weight of loads to be placed in the corresponding section and electrical components having fixed values predetermined in dependence upon the weight of the section, the buoyancy characteristics of the section and the distance of the section from a reference transverse plane of the ship and being connected to the first and second signal-generating means to receive the draught
  • elementary computing means for each of a plurality of sections into which the ship is assumed to be divided for the purpose of the calculation, to produce a current and a voltage both of which represent the resultant force that should act on the corresponding section for the proposed manner of loading, a moment-computing circuit for each of those sections to one side of the plane the bending moment at which is to be calculated having a resistance having a value inversely proportional to the distance of the corresponding section from the plane, means to apply the voltages representing the resultant forces on those sections to one side of the plane to energise, respectively, the corresponding moment-computing circuits to produce currents through their resistances representing, respectively, the moments of those sections about a transverse axis in the plane, means for adding the currents to provide a measure of bending moment at the said plane, and means for adding the

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US21797A 1959-04-28 1960-04-12 Apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded ship Expired - Lifetime US3128375A (en)

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US (1) US3128375A (fr)
BE (1) BE588905A (fr)
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SE (1) SE302536B (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296863A (en) * 1964-04-01 1967-01-10 Magnetic Instr Co Ship draft gage
US3329808A (en) * 1963-04-08 1967-07-04 Sperry Rand Corp Cargo loading computer
US3334608A (en) * 1963-03-16 1967-08-08 Ishikawajima Harima Heavy Ind Method and apparatus for establishing draft and trim of a vessel
US3364476A (en) * 1964-06-04 1968-01-16 Navy Usa Interaction analyzer
US3408487A (en) * 1963-03-11 1968-10-29 Wilde Gustavus De Apparatus for calculating the loading effect in a ship
US3441721A (en) * 1964-12-21 1969-04-29 Goetaverken Ab Device for gauging the effect of the cargo distribution on a vessel
US3934133A (en) * 1972-05-30 1976-01-20 Kockums Mekaniska Verkstads Ab Apparatus for the correction of shear forces
US4037552A (en) * 1973-12-01 1977-07-26 Sener, Tecnica Industrial Y Naval S.A. Process for reducing the stresses caused by the vertical bending of a boat on independent tanks installed therein
US4347574A (en) * 1978-10-11 1982-08-31 Parsons Ward H Method of and apparatus for determining with precision the payload of a water borne vessel
US4409842A (en) * 1981-05-18 1983-10-18 Scott Science & Technology, Inc. Structural information detector
US4480480A (en) * 1981-05-18 1984-11-06 Scott Science & Technology, Inc. System for assessing the integrity of structural systems
US4872118A (en) * 1984-08-09 1989-10-03 Naidenov Evgeny V System for automated monitoring of trim and stability of a vessel
WO2003043880A1 (fr) * 2001-10-10 2003-05-30 Kalman Ziha Procede de determination du deplacement de navires presentant des deflexions
US6836746B2 (en) 2002-04-01 2004-12-28 Control Stuff, Inc. Method and apparatus for calculating the payload on a water-borne vessel
US20090023507A1 (en) * 2007-07-16 2009-01-22 Veitch Colin S Systems and methods for installing a bowling center on a ship

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112793729B (zh) * 2021-01-25 2022-08-23 中国铁建港航局集团有限公司 防砰击装置

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US2087667A (en) * 1934-01-10 1937-07-20 Pennsylvania Railroad Co Computer
US2630968A (en) * 1948-11-01 1953-03-10 Gulf Research Development Co Electrical calculator for solving phase equilibrium problems
US2725193A (en) * 1953-09-11 1955-11-29 Continental Silver Co Inc Computing equipment for loading cargo aircraft
US2856127A (en) * 1954-11-26 1958-10-14 Continental Electrolog Corp Equipment for planning the loading of cargo aircraft
US2865566A (en) * 1953-05-16 1958-12-23 Goetaverken Ab Apparatus for the estimation of the distribution of the cargo in a ship
US2987254A (en) * 1957-08-20 1961-06-06 Continental Electrolog Corp Equipment for planning the loading of cargo aircraft

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US2087667A (en) * 1934-01-10 1937-07-20 Pennsylvania Railroad Co Computer
US2630968A (en) * 1948-11-01 1953-03-10 Gulf Research Development Co Electrical calculator for solving phase equilibrium problems
US2865566A (en) * 1953-05-16 1958-12-23 Goetaverken Ab Apparatus for the estimation of the distribution of the cargo in a ship
US2725193A (en) * 1953-09-11 1955-11-29 Continental Silver Co Inc Computing equipment for loading cargo aircraft
US2856127A (en) * 1954-11-26 1958-10-14 Continental Electrolog Corp Equipment for planning the loading of cargo aircraft
US2987254A (en) * 1957-08-20 1961-06-06 Continental Electrolog Corp Equipment for planning the loading of cargo aircraft

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3408487A (en) * 1963-03-11 1968-10-29 Wilde Gustavus De Apparatus for calculating the loading effect in a ship
US3334608A (en) * 1963-03-16 1967-08-08 Ishikawajima Harima Heavy Ind Method and apparatus for establishing draft and trim of a vessel
US3329808A (en) * 1963-04-08 1967-07-04 Sperry Rand Corp Cargo loading computer
US3296863A (en) * 1964-04-01 1967-01-10 Magnetic Instr Co Ship draft gage
US3364476A (en) * 1964-06-04 1968-01-16 Navy Usa Interaction analyzer
US3441721A (en) * 1964-12-21 1969-04-29 Goetaverken Ab Device for gauging the effect of the cargo distribution on a vessel
US3934133A (en) * 1972-05-30 1976-01-20 Kockums Mekaniska Verkstads Ab Apparatus for the correction of shear forces
US4037552A (en) * 1973-12-01 1977-07-26 Sener, Tecnica Industrial Y Naval S.A. Process for reducing the stresses caused by the vertical bending of a boat on independent tanks installed therein
US4347574A (en) * 1978-10-11 1982-08-31 Parsons Ward H Method of and apparatus for determining with precision the payload of a water borne vessel
US4409842A (en) * 1981-05-18 1983-10-18 Scott Science & Technology, Inc. Structural information detector
US4480480A (en) * 1981-05-18 1984-11-06 Scott Science & Technology, Inc. System for assessing the integrity of structural systems
US4872118A (en) * 1984-08-09 1989-10-03 Naidenov Evgeny V System for automated monitoring of trim and stability of a vessel
WO2003043880A1 (fr) * 2001-10-10 2003-05-30 Kalman Ziha Procede de determination du deplacement de navires presentant des deflexions
US6836746B2 (en) 2002-04-01 2004-12-28 Control Stuff, Inc. Method and apparatus for calculating the payload on a water-borne vessel
US20090023507A1 (en) * 2007-07-16 2009-01-22 Veitch Colin S Systems and methods for installing a bowling center on a ship

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NL249970A (fr)
GB918992A (en) 1963-02-20
CH411406A (de) 1966-04-15
BE588905A (fr) 1960-07-18
SE302536B (fr) 1968-07-22

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