EP0338901A1 - Magnetisches Minenräumungssystem - Google Patents

Magnetisches Minenräumungssystem Download PDF

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Publication number
EP0338901A1
EP0338901A1 EP89401033A EP89401033A EP0338901A1 EP 0338901 A1 EP0338901 A1 EP 0338901A1 EP 89401033 A EP89401033 A EP 89401033A EP 89401033 A EP89401033 A EP 89401033A EP 0338901 A1 EP0338901 A1 EP 0338901A1
Authority
EP
European Patent Office
Prior art keywords
solenoids
substantially equal
magnetic
solenoid
ship
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.)
Granted
Application number
EP89401033A
Other languages
English (en)
French (fr)
Other versions
EP0338901B1 (de
Inventor
Jean Verveur
Jean-Jacques Periou
Germain Guillemin
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.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0338901A1 publication Critical patent/EP0338901A1/de
Application granted granted Critical
Publication of EP0338901B1 publication Critical patent/EP0338901B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B63G7/00—Mine-sweeping; Vessels characterised thereby
    • B63G7/02—Mine-sweeping means, Means for destroying mines
    • B63G7/06—Mine-sweeping means, Means for destroying mines of electromagnetic type

Definitions

  • the present invention relates to magnetic dredging systems which make it possible to destroy underwater mines, the triggering of which is activated by variations in the magnetic field due to the vessel to sink.
  • Most of the boats are in fact made of iron and also have large ferro-magnetic masses, and even if they have been successfully demagnetized they bring a significant disturbance to the earth's magnetic field. It is then relatively easy to detect these disturbances to detonate a mine.
  • each magnet is contained in a container with a diameter of 0.90m x 5m long, weighing 3 tonnes, which however allows only a moment relatively low magnetic strength of 90,000 A / m2.
  • the variations in the magnetization are done in increments of 10,000 A / m2 which allows only a fairly rough approximation of the distribution of the field to be imitated.
  • the invention proposes using a set of solenoids distributed in width over the desired intercept and towed by the minesweeper at a good distance. These solenoids are powered by a variable electric current, so that the variations in the magnetic field obtained by these current variations simulate the passage of a vessel of the desired size, while the distribution of the solenoids in the direction of travel of the dredger is almost punctual.
  • FIG. 1 shows a minesweeper 101 which tows, using cables 102, a set of three drums 103 which contain solenoids supplied by an electronic device 104 located on board the dredger 101.
  • the necessary currents circulate between this equipment and the solenoids via the towing cables.
  • the distance d1 between the dredger and the drums is approximately 400m in order to avoid any confusion between the residual magnetic field of the dredger and that of the solenoids and to prevent the dredger from being hit by the mine explosion when it are triggered by the action of solenoids.
  • the cans 103 are kept apart from each other by a transverse bar 105 which keeps them separated by a width l, corresponding to the intercept of each of the cans.
  • An intercept equal to 3 l is thus obtained, which in proportion to the mass of the solenoid and to the intensity consumed in it is considerably higher than that which would be obtained by a single solenoid.
  • a fourth container 106 is towed behind the central container at a distance of approximately 450m from the dredger.
  • This fourth container contains a noise simulator which makes it possible to decoy mines operating from the reception of acoustic noise from boats.
  • the most sophisticated mines which determine the correlation between the magnetic signature of a building and its acoustic signature can also be triggered by this combined dredging system.
  • a solenoid was made comprising 3,960 turns, the outside diameter of which is 0.90m and the total length of 4.38m.
  • the use of aluminum has made it possible to obtain for this device a weight less than 1.700 kg, which corresponds to a gain in mass related to copper for the same magnetic moment in a ratio of 1.77.
  • Such a device also makes it possible to simulate the alternating magnetic fields which exist on all buildings, whatever the precautions taken. Indeed for example the simple movement of the propellers in sea water, which is conductive, induces alternating magnetic fields having frequencies of the order of Hertz which, although weak, are perfectly detectable as characteristics of a building for order the firing of a magnetic mine to detect such fields.
  • the device thus described makes it possible to wind next to the main solenoid a secondary solenoid intended to be supplied with alternating current to simulate these alternating magnetic fields.
  • a solenoid can be produced, for example, from a wire of 2 mm2 of section wound on 158 turns over a diameter of 0.90m and over a length of 0.35m.
  • the resistance of such a solenoid is 3 ohms and its inductance of 0.09 H.
  • By supplying it with an alternating current of 10 A we obtains a magnetic moment substantially equal to 1,000 A / m2, which is of an intensity quite sufficient to simulate the alternating fields of a building of suitable size.
  • the figure of 1,700 kg cited above includes the weight of this solenoid intended to produce an alternating field.
  • FIG. 2 shows an exemplary embodiment of the control circuits for 3 solenoids 201 to 203 placed in parallel as in FIG. 1.
  • a function generator 204 delivers a voltage which represents the shape of the magnetic field to be obtained, taking into account the characteristics of the building to be simulated and the speed of the minesweeper 101.
  • the output signal of this generator evolves very slowly as a function of time. and it is therefore applied to amplifiers 205 to 207 whose characteristics at very low frequency are adapted to the speed of variation of this signal.
  • These amplifiers are respectively connected to the solenoids 201 to 203 and it is known in the art to produce such amplifiers making it possible to deliver the necessary power on the impedance of these solenoids with a signal which varies very slowly as a function of time.
  • a frequency generator 208 delivers a set of frequencies which correspond to the different alternating fields which would be delivered by the building whose presence must be simulated. These frequencies are applied to low frequency amplifiers 209 to 211 whose outputs are connected to the appropriate windings of the solenoids 201 to 203. These amplifiers are adapted in frequency and in power to the characteristics of the windings to which they are connected and are of a more technical classic than that of amplifiers 205 to 207.
  • the system thus described therefore allows very effective dredging of a minefield over a large width with remarkably reduced means both in terms of mass and of dissipated power.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
EP19890401033 1988-04-19 1989-04-14 Magnetisches Minenräumungssystem Expired - Lifetime EP0338901B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8805142A FR2630081B1 (fr) 1988-04-19 1988-04-19 Systeme de dragage magnetique
FR8805142 1988-04-19

Publications (2)

Publication Number Publication Date
EP0338901A1 true EP0338901A1 (de) 1989-10-25
EP0338901B1 EP0338901B1 (de) 1992-07-22

Family

ID=9365432

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890401033 Expired - Lifetime EP0338901B1 (de) 1988-04-19 1989-04-14 Magnetisches Minenräumungssystem

Country Status (3)

Country Link
EP (1) EP0338901B1 (de)
DE (1) DE68902169T2 (de)
FR (1) FR2630081B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991010587A1 (en) * 1990-01-22 1991-07-25 Sa Marine Ab Method and device for controlling a multielectrode sweep
FR2666559A1 (fr) * 1990-09-11 1992-03-13 Thomson Csf Systeme de dragage magnetique.
US5183119A (en) * 1991-06-14 1993-02-02 Regents Of The University Of California Anti-snag plowing system
US5361675A (en) * 1992-06-18 1994-11-08 Israel Aircraft Industries Ltd Magnetic mine detonation apparatus
US5719501A (en) * 1994-11-08 1998-02-17 Israeli Aircraft Industries, Ltd. Mine simulation system having an electromagnetic field disturbing device
WO2001002247A1 (en) * 1999-07-06 2001-01-11 Elesco Oy A system for minesweeping

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR862813A (fr) * 1940-01-10 1941-03-17 Dispositif contre les mines sous-marines
FR1188684A (fr) * 1956-12-11 1959-09-24 Licentia Gmbh Dispositif pour le dragage de mines magnétiques
DE974576C (de) * 1954-01-31 1961-02-16 Koch August G Maschinen Hohlstab-Fernraeum-Geraet fuer Magnetminen
EP0130767A1 (de) * 1983-07-04 1985-01-09 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Magnetische Einrichtungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR862813A (fr) * 1940-01-10 1941-03-17 Dispositif contre les mines sous-marines
DE974576C (de) * 1954-01-31 1961-02-16 Koch August G Maschinen Hohlstab-Fernraeum-Geraet fuer Magnetminen
FR1188684A (fr) * 1956-12-11 1959-09-24 Licentia Gmbh Dispositif pour le dragage de mines magnétiques
EP0130767A1 (de) * 1983-07-04 1985-01-09 The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Magnetische Einrichtungen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991010587A1 (en) * 1990-01-22 1991-07-25 Sa Marine Ab Method and device for controlling a multielectrode sweep
US5323726A (en) * 1990-01-22 1994-06-28 Sa Marine Ab Method and device for controlling a multi electrode sweep
FR2666559A1 (fr) * 1990-09-11 1992-03-13 Thomson Csf Systeme de dragage magnetique.
EP0475834A1 (de) * 1990-09-11 1992-03-18 Thomson-Csf Magnetisches Minenräumsystem
US5183119A (en) * 1991-06-14 1993-02-02 Regents Of The University Of California Anti-snag plowing system
US5361675A (en) * 1992-06-18 1994-11-08 Israel Aircraft Industries Ltd Magnetic mine detonation apparatus
US5719501A (en) * 1994-11-08 1998-02-17 Israeli Aircraft Industries, Ltd. Mine simulation system having an electromagnetic field disturbing device
WO2001002247A1 (en) * 1999-07-06 2001-01-11 Elesco Oy A system for minesweeping

Also Published As

Publication number Publication date
EP0338901B1 (de) 1992-07-22
DE68902169D1 (de) 1992-08-27
FR2630081B1 (fr) 1993-03-26
DE68902169T2 (de) 1993-01-21
FR2630081A1 (fr) 1989-10-20

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