GB918992A - Improvements relating to apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded ship - Google Patents
Improvements relating to apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded shipInfo
- Publication number
- GB918992A GB918992A GB12622/60A GB1262260A GB918992A GB 918992 A GB918992 A GB 918992A GB 12622/60 A GB12622/60 A GB 12622/60A GB 1262260 A GB1262260 A GB 1262260A GB 918992 A GB918992 A GB 918992A
- Authority
- GB
- United Kingdom
- Prior art keywords
- section
- ship
- trim
- depth
- resistors
- 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
Links
- 238000005452 bending Methods 0.000 title abstract 6
- 238000010008 shearing Methods 0.000 title abstract 5
- 238000005259 measurement Methods 0.000 abstract 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Adjustable Resistors (AREA)
Abstract
918,992. Electric analogue computers for the loading of ships. SINTEF. April 8, 1960 [April 28, 1959], No. 12622/60. Class 37. Depth, trim, bending moment and shearing stress are calculated for a loaded ship by assuming the ship divided into a number of sections and associating each with an apparatus section of an electric analogue computer which comprises resistors, potentiometers and adjusting means set according to depth, trim and load. In one section P11 is a variable resistor giving section load and R11 and R41 fixed resistors such that the sum of the currents through them when voltages e s and - e s are applied respectively and P11 is maximum (no load) equals the weight of the section- R51 represents the buoyancy factor of the ship's section and R61 the product of the buoyancy factor. and the distance of the section from midship. The current i o1 is proportional to the resultant weight of the ship's section. Similar references apply in the other sections. The voltage e D is adjusted so that the sum of currents i o1 , i o2 , &c. will be 0, e 0 on the potentiometer being a measure of D, the depth of the ship. e 01 is the voltage across a fixed resistor R 01 and itis applied over a fixed resistor RM 1 , where 1/RM is proportional to the distance from the plane about which one wants to determine the bending moment. The sum of all the currents iM 1 , iM 2 , &c. equals the total moment. The voltage e T is adjusted by potentiometer so that the sum of the currents iM 1 , &c., is zero by reference to one end of the ship, the value of e T then giving the trim angle. The bending moment and shearing stress at any plane are obtained by summing the currents iM n and i on respectively. Three of the eight sets of resistors for an eight-section ship are shown in Fig. 5 and more than one load, e.g. tanks, in any one section are indicated by several adjustable resistors, e.g. P 12 , P 22 , P 32 . Three areas are shown, B, C, D, E, the weight unit, C, D,F,G, the moment unit, and H, B, O, K, the control unit. Switch S in the weight unit has one position for determining depth, and other positions for determining shearing stress. The switch M in the moment unit is adjusted to the measurement of trim and by bringing in resistors R A5 , R A6 , R A7 , R A8 or R B6 , R B7 and R B8 , allows the bending moments between sections to be read on an instrument A 2 , or on a potentiometer P M with A 2 showing a null reading. The control unit consists of a voltage divider R 0 -R 0 and four potentiometers P D , P T , P S and P M , the positions of which give depth, trim, shearing stress and bending moment, respectively. Resistors P11 and R11 may be replaced by a potentiometer giving greater accuracy (Fig. 6, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO13166259 | 1959-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB918992A true GB918992A (en) | 1963-02-20 |
Family
ID=19908476
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB12622/60A Expired GB918992A (en) | 1959-04-28 | 1960-04-08 | Improvements relating to apparatus for calculation of depth, trim, bending moment and shearing stress in a loaded ship |
Country Status (6)
Country | Link |
---|---|
US (1) | US3128375A (en) |
BE (1) | BE588905A (en) |
CH (1) | CH411406A (en) |
GB (1) | GB918992A (en) |
NL (1) | NL249970A (en) |
SE (1) | SE302536B (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1074677A (en) * | 1963-03-11 | 1967-07-05 | Gustavus De Wilde | Analogue computer for calculating bending moments and/or shearforces of ships |
GB1029725A (en) * | 1963-03-16 | 1966-05-18 | Ishikawajima Harima Heavy Ind | Means and method for the adjustment or maintenance of the trim of a ship |
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 |
SE318433B (en) * | 1964-12-21 | 1969-12-08 | Goetaverken Ab | |
SE363685B (en) * | 1972-05-30 | 1974-01-28 | Lastfoerdelningsinstrument & C | |
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 |
US4480480A (en) * | 1981-05-18 | 1984-11-06 | Scott Science & Technology, Inc. | System for assessing the integrity of structural systems |
US4409842A (en) * | 1981-05-18 | 1983-10-18 | Scott Science & Technology, Inc. | Structural information detector |
US4872118A (en) * | 1984-08-09 | 1989-10-03 | Naidenov Evgeny V | System for automated monitoring of trim and stability of a vessel |
HRP20010731A2 (en) * | 2001-10-10 | 2003-04-30 | Aeiha Kalman | Method of determining a displacement of longitudinally deformed ships |
US6836746B2 (en) | 2002-04-01 | 2004-12-28 | Control Stuff, Inc. | Method and apparatus for calculating the payload on a water-borne vessel |
MX2010000709A (en) * | 2007-07-16 | 2010-06-02 | Ncl Corp Ltd | Systems and methods for installing a bowling center on a ship. |
CN112793729B (en) * | 2021-01-25 | 2022-08-23 | 中国铁建港航局集团有限公司 | Anti-slamming device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
NL187586B (en) * | 1953-05-16 | Raffinage En Universal Matthey | METHOD OF TREATING CRUDE OIL. | |
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 |
BE570472A (en) * | 1957-08-20 |
-
0
- NL NL249970D patent/NL249970A/xx unknown
-
1960
- 1960-03-22 BE BE588905A patent/BE588905A/en unknown
- 1960-03-30 SE SE3168/60A patent/SE302536B/xx unknown
- 1960-04-08 GB GB12622/60A patent/GB918992A/en not_active Expired
- 1960-04-12 US US21797A patent/US3128375A/en not_active Expired - Lifetime
- 1960-04-20 CH CH450260A patent/CH411406A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CH411406A (en) | 1966-04-15 |
BE588905A (en) | 1960-07-18 |
NL249970A (en) | |
US3128375A (en) | 1964-04-07 |
SE302536B (en) | 1968-07-22 |
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