EP1196319B1 - Schwimmer für schlepptrosse - Google Patents

Schwimmer für schlepptrosse Download PDF

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Publication number
EP1196319B1
EP1196319B1 EP00951673A EP00951673A EP1196319B1 EP 1196319 B1 EP1196319 B1 EP 1196319B1 EP 00951673 A EP00951673 A EP 00951673A EP 00951673 A EP00951673 A EP 00951673A EP 1196319 B1 EP1196319 B1 EP 1196319B1
Authority
EP
European Patent Office
Prior art keywords
float
float according
horizontal
horizontal portion
line
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
EP00951673A
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English (en)
French (fr)
Other versions
EP1196319A1 (de
Inventor
Philippe Hocquet
Loic Pierre Boudet
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.)
Westerngeco AS
Original Assignee
Westerngeco AS
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Filing date
Publication date
Application filed by Westerngeco AS filed Critical Westerngeco AS
Publication of EP1196319A1 publication Critical patent/EP1196319A1/de
Application granted granted Critical
Publication of EP1196319B1 publication Critical patent/EP1196319B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/42—Towed underwater vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56—Towing or pushing equipment
    • B63B21/66—Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables

Definitions

  • This invention relates to a float line affected, the scope of which is generally seismic measurements at sea, in which a battery of sensor carrying lines is touched at the stern of a ship.
  • Each lines includes a deflector in front of sensors, which is a submerged and vertical wing which undergoes a transverse lift and maintains the line at side of the ship's wake, and a float at which the deflector is suspended and whose purpose is to prevent the line to sink under the weight of the deflector.
  • the floats must be insensitive to the disturbances inflicted on them in particular by the swell. We regret on this subject that the known floats oscillate too easily in vertical direction following the movements of the swell.
  • the line of suspension of the deflector on the float is subject to periodic surges that can end up breaking it by fatigue or creating damage to attachment points, and the quality of the measurements can also be disturbed.
  • the float which will be described later remedies this disadvantage while having good stability of road, especially in its best achievement.
  • floats such as that of US-A-4 549 499) have a tapered shape, swollen in the center and tapering gradually towards the ends.
  • a another prior art is described in US 3,760,761.
  • float according to the invention defined by claims includes a horizontal portion of floating body of which the shape is also noticeably tapered, but also an upper portion of floating body, extending from the horizontal portion upwards and being able have horizontal cross sections substantially uniform; moreover, the portion horizontal is completely submerged and the portion upper part is partially emerged when the float supports the line, or a heavy element thereof.
  • the vertical movement of the swell is therefore mainly translated by a variation of immersion of the upper portion without exerting any noticeable force on the float because of the uniformity of its section and the little variation of the submerged volume: the movement vertical oscillating float and its load therefore not the opportunity to appear on a large scale.
  • Stability is even better if the upper portion rises behind the portion horizontal, and especially if the suspension member of the deflector is located in front of the upper portion.
  • this suspension device includes a single transverse axis joint, the float is restrained against rolling movements and returns more easily in place.
  • the handling of the float is improved if its horizontal portion is wider than it is tall, which reduces its lateral projected surface, therefore the lateral disturbing forces.
  • FIG. 1 Part of line touched for measurements is shown in Figure 1. It includes, on one side and on the other of a submerged deflector 1, a forward section of line 2 attached to a vessel located left and a rear line portion 3 to which are attached to the sensors located on the right (outside the figure).
  • a line diversion 4 connects the front and rear portions 2 and 3 bypassing the deflector 1, and is used to transmit the signal from sensors to the ship.
  • Deflector 1 is kept at a substantially constant depth thanks to a float 5, characteristic of the invention, preventing it to be damaged to which it is suspended by a cable or a chain 18.
  • the float 5 includes a portion horizontal and lower floating body called here time zone 6 and an upper vertical portion of body floating called leg 7.
  • the time zone 6 presents: a front portion 8 intended to promote penetration in the water and which therefore tapers forwards, up to a rounded tip 9; a middle portion 10 of section substantially uniform; and a rear portion 11 tapering towards the rear, a bottom surface 12 of the zone 6 undergoing a setback at this location ascending 13 to escape upwards and form a concavity for housing a vertical fin 14; other fins, horizontal, 15 are placed on the sides of the time zone 6.
  • the horizontal fins 15 are disadvantageous in that they increase the bulk transverse of float 5, but we can make them removable or retractable to retract them when the float 5 will be stowed on board the ship.
  • the straight sections of time zone 6 are substantially rectangular and that its faces are limited by edges 24 almost forming angles vivid, as shown in Figure 3.
  • the bottom 12 is flat over a large part of the length, especially under the middle part 10, and the surface upper spindle 6 forms a flat upper bridge 16 at the middle part 10 and the part rear 11.
  • the leg 7 is advantageously at the rear of time zone 6 and extends substantially over half of its length, substantially over the entire rear part 11 and on half of the middle part 10.
  • An organ of suspension 17 of the deflector 1 by the chain 18 is attached to the bottom 12, and comprises a flange 19 fixed to the time zone 6, a connecting rod 20 connected to the chain 18 and a joint 25 of transverse axis between them, which therefore allows the rod 20 to oscillate back and forth rear but not sideways, so the deflector 1 helps stabilize the float 5 against rolling movements by restricting its rotation around the longitudinal axis.
  • a chain of safety 26 could still unite deflector 1 with flange 19 and support this one if the suspension member 17 broke.
  • the connecting rod 20 may include a shock absorber.
  • Leg 7 is, substantially, half submerged under the surface E of water and includes a front portion 21 rounded in half-cylinder for promote penetration, and a rear portion 22 formed of two sections meeting at an edge 23 located at the back.
  • Leg 7 is smooth, with substantially identical horizontal cross sections, in order to limit the forces produced by the movements vertical swell.
  • the mechanical principle sought consists of more generally to make the natural frequency of heaving (vertical oscillating movement) of the float 5 close to a value where the movements of the swell exerts only minimal effort, which reduces the efforts on the suspension member 17.
  • the spindle dimensions 6 and leg section 7 can be chosen accordingly, depending on results of numerical simulations or tests in pool. However, it has been observed that a favorable result was more easily reached if the bottom 12 and the bridge 16 were flat and relatively close one of the other, which justifies the shape wider than tall of time zone 6. We are also trying to increase the friction produced by the vertical movement of water to dampen the oscillations of the float 5; the almost sharp angles at the edges 24 of the time zone 6, likewise that the horizontal fins 15, give this result in favoring vortices.
  • leg 7 serves rudder, the vertical fin 14 having the same effect if added.
  • Leg 7 is best arranged at the rear of the time zone 6, and the flange 19 also at the front that we can without breaking the balance of the float 5, in front of leg 7 or at least most of it.
  • the center of the hull of float 5 must be advanced and its center of gravity moved back. flattening of zone 6 and the reduction of its lateral surface which the result is also beneficial in this, since the lateral disturbances produced by water will reduced.
  • ballast in general, we prefer not to place ballast in float 5, which could make it more stable but would increase its mass and displacement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Claims (10)

  1. Schwimmer (5) für eine Schlepptrosse, umfassend einen stromlinienförmigen Horizontalabschnitt (6 : 8, 10, 11), dadurch gekennzeichnet, dass er einen oberen Abschnitt (7) umfasst, der sich vom Horizontalabschnitt aufwärts erstreckt, und dass der Horizontalabschnitt vollständig eingetaucht und der obere Abschnitt teilweise aufgetaucht ist, wenn der Schwimmer ein Element (1) der Trosse trägt.
  2. Schwimmer nach Anspruch 1, dadurch gekennzeichnet, dass der obere Abschnitt (7) im hinteren Bereich des Horizontalabschnitts (6) montiert ist.
  3. Schwimmer nach Anspruch 2, dadurch gekennzeichnet, dass ein unter dem Horizontalabschnitt angeordnetes Aufhängungsorgan (19) für einen Abschnitt (1) der Trosse auch vor wenigstens dem größten Teil des oberen Abschnitts (7) angeordnet ist.
  4. Schwimmer nach Anspruch 3, dadurch gekennzeichnet, dass das Aufhängungsorgan (19) ein einzelnes Gelenk (25) umfasst, das eine Querachse aufweist.
  5. Schwimmer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Horizontalabschnitt (6) eine größere Breite als Höhe aufweist.
  6. Schwimmer nach Anspruch 5, dadurch gekennzeichnet, dass der Horizontalabschnitt einen teilweise flachen Boden (12) und eine teilweise flache obere Brücke (16) aufweist.
  7. Schwimmer nach Anspruch 6, dadurch gekennzeichnet, dass der Horizontalabschnitt rechteckige Querschnitte aufweist.
  8. Schwimmer nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass er hinten einen Boden mit einer aufsteigenden Einbuchtung (13) umfasst, wobei Vertikalkiele (14) in der Einbuchtung aufgenommen sind.
  9. Schwimmer nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass er am Horizontalabschnitt (6) Horizontalkiele (15) umfasst.
  10. Schwimmer nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der obere Abschnitt (7) im Wesentlichen gleichförmige Horizontalquerschnitte aufweist.
EP00951673A 1999-07-16 2000-07-13 Schwimmer für schlepptrosse Expired - Lifetime EP1196319B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9909249A FR2796360B1 (fr) 1999-07-16 1999-07-16 Flotteur de ligne touee
FR9909249 1999-07-16
PCT/FR2000/002030 WO2001005648A1 (fr) 1999-07-16 2000-07-13 Flotteur de ligne touee

Publications (2)

Publication Number Publication Date
EP1196319A1 EP1196319A1 (de) 2002-04-17
EP1196319B1 true EP1196319B1 (de) 2004-05-12

Family

ID=9548180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00951673A Expired - Lifetime EP1196319B1 (de) 1999-07-16 2000-07-13 Schwimmer für schlepptrosse

Country Status (8)

Country Link
US (1) US6755144B1 (de)
EP (1) EP1196319B1 (de)
AU (1) AU779891B2 (de)
CA (1) CA2379248A1 (de)
FR (1) FR2796360B1 (de)
GB (1) GB2369093B (de)
NO (1) NO20020199L (de)
WO (1) WO2001005648A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7457193B2 (en) * 2006-07-21 2008-11-25 Pgs Geophysical As Seismic source and source array having depth-control and steering capability
US8570829B2 (en) * 2009-12-22 2013-10-29 Pgs Geophysical As Depth steerable seismic source array
US9341730B2 (en) * 2012-03-16 2016-05-17 Cgg Services Sa Steering submersible float for seismic sources and related methods
NO335660B1 (no) * 2012-06-26 2015-01-19 Ulmatec Baro As En marin geofysisk deflektor for tauing av seismiske arrayer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS556555B2 (de) * 1971-12-02 1980-02-18
GB2031361B (en) * 1978-10-14 1982-10-27 Plessey Co Ltd Hydrodynamic devices
US4549499A (en) * 1981-05-19 1985-10-29 Mobil Oil Corporation Floatation apparatus for marine seismic exploration
US4729333A (en) * 1986-07-09 1988-03-08 Exxon Production Research Company Remotely-controllable paravane
NO301445B1 (no) * 1994-07-13 1997-10-27 Petroleum Geo Services As Anordning for sleping
US5829184A (en) * 1995-11-24 1998-11-03 Studanski; Richard R. Zigzag aquatic device and method

Also Published As

Publication number Publication date
GB2369093A (en) 2002-05-22
AU779891B2 (en) 2005-02-17
GB2369093B (en) 2003-06-18
EP1196319A1 (de) 2002-04-17
CA2379248A1 (en) 2001-01-25
FR2796360B1 (fr) 2001-09-07
US6755144B1 (en) 2004-06-29
WO2001005648A1 (fr) 2001-01-25
FR2796360A1 (fr) 2001-01-19
AU6453400A (en) 2001-02-05
GB0200570D0 (en) 2002-02-27
NO20020199D0 (no) 2002-01-14
NO20020199L (no) 2002-03-15

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