EP0247367B1 - Verfahren zur Einstellung einer magnetischen Eigenschutz (MES)-Anlage zur Kompensation des magnetischen Störfeldes eines Fahrzeuges, insbesondere Schiffes - Google Patents

Verfahren zur Einstellung einer magnetischen Eigenschutz (MES)-Anlage zur Kompensation des magnetischen Störfeldes eines Fahrzeuges, insbesondere Schiffes Download PDF

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Publication number
EP0247367B1
EP0247367B1 EP19870106093 EP87106093A EP0247367B1 EP 0247367 B1 EP0247367 B1 EP 0247367B1 EP 19870106093 EP19870106093 EP 19870106093 EP 87106093 A EP87106093 A EP 87106093A EP 0247367 B1 EP0247367 B1 EP 0247367B1
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EP
European Patent Office
Prior art keywords
field
coil
vehicle
measuring
magnetic
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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
EP19870106093
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German (de)
English (en)
French (fr)
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EP0247367A1 (de
Inventor
Johann Dr. Flecken
Rudolf Dipl.-Ing. Kock
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.)
Bundesrepublik Deutschland Vertr Durch D Bundesm D Vert Vertr Durch Den Pras D Bundesamt fur Wehrtech U Beschaffung
Original Assignee
Bundesrepublik Deutschland Vertr Durch D Bundesm D Vert Vertr Durch Den Pras D Bundesamt fur Wehrtech U Beschaffung
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Publication of EP0247367A1 publication Critical patent/EP0247367A1/de
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    • 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
    • B63G9/00—Other offensive or defensive arrangements on vessels against submarines, torpedoes, or mines
    • B63G9/06—Other offensive or defensive arrangements on vessels against submarines, torpedoes, or mines for degaussing vessels

Definitions

  • the invention relates to a method for the initial setting of a magnetic self-protection (MES) system, which has a large-scale coil system consisting of current-carrying coils arranged in three orthogonal axes for compensating the magnetic self-field of a vehicle, in a stationary measuring system with a magnetic field arranged in a matrix.
  • MES magnetic self-protection
  • the self-field to be compensated is measured in at least one coordinate direction and the compensation currents are automatically determined in terms of size and direction by means of computing stages, taking into account the air coil field and its interference by ferromagnetic influences, so that the vehicle field resulting from the self-field and the compensation field is minimized .
  • Each ship equipped with an MES system initially experiences a first (basic) setting of the MES system based on a so-called magnetic measurement, in which an optimal compensation value is achieved by setting suitable winding currents.
  • the MES system then switched on controls the currents in the individual coils while driving so that the compensation of the self-field is maintained.
  • each ship must be magnetically measured again at certain intervals and the MES system may have to be readjusted accordingly (setting check).
  • the settings are disproportionately complex due to the strong magnetic interactions between the individual coils (and partial coils) of the MES system. Due to the irregular geometrical shapes of the coils, the problem also eludes simple mathematical calculation methods, in particular with regard to the influence of ferromagnetic internals on the magnetic field of the coils (real effects). In addition, erroneous geometric data for specifying the coil position in the ship limit the usefulness of field calculations.
  • the object of the invention is to take into account the real vehicle conditions, in particular with regard to the ferromagnetic influences on the coil fields, as comprehensively and precisely as possible in the calculation stage in the method described at the outset.
  • This object is achieved according to the invention in that, before determining the compensation currents, each coil is successively acted upon by a measuring current of a defined size and direction, and at least one component of the measuring field that is established is measured in each case and in a further arithmetic stage using the predetermined values for the respective measuring current and the geometric dimensions and further data of the respective coil, the air coil field and, using the values for the measuring field, the value of the proportional field change compared to the calculated air coil field, the "winding effect", is determined and that the values thus determined for the winding effect of the individual coils can be looped into the computing stages for determining the compensation currents.
  • inaccuracies and errors in the coil geometry data are additionally "corrected" so that the compensation of the vehicle interference field becomes very precise.
  • This measure succeeds in that for the additional acquisition of faulty geometric data to indicate the position of the individual coils in the vehicle in the further computing stage using approximation and iteration methods, the values for the coil coordinates of the individual coils are changed iteratively until the calculated values of the respective air coil field are approximated to the measured values of the respective measuring field to a predetermined extent and that the values thus determined for the corrected coil position coordinates are additionally looped into the arithmetic stage for determining the compensation currents.
  • magnetic winding effects By recording the "magnetic winding effects" from direct measurements and storing them in a database, including the measurement data about the self-field, an easy-to-carry out setting check is also possible according to a further embodiment of the invention.
  • the storage of the magnetic winding effects and the other data during the initial setting allows a quick comparison with the state of the MES system with regard to the occurrence of changes and thus a quick and clear determination of any new compensation currents.
  • DE-OS 31 22 688 describes a controller of an MES system, which ensures that the optimal compensation currents determined during the initial setting are maintained during driving. This controller adjusts the compensation currents so that the compensation is retained.
  • the control behavior of the controller is - as in the case of the initial setting according to DE-PS 31 32 933 - determined by a mathematical model that roughly approximates the vehicle conditions.
  • the well-known mathematical model tries to describe the magnetic effects of the MES compensation windings using magnetic dipoles.
  • the disadvantages of the mathematical model are the same as explained at the beginning.
  • this document does not concern the initial setting of the MES system of the vehicle but the on-board controller for driving.
  • FIG. 1 shows the coil system of an MES system in a hull
  • 5 shows the data flow diagram of the MES setting during a setting check.
  • FIG. 1 shows the large-scale, three-axis coil system of an MES system of a ship 1 (as an example of a vehicle as a ferromagnetic interference body).
  • This coil system consists of coils in the three orthogonal axes. Each coil is usually divided into three partial coils, which are no longer shown.
  • One coil serves to compensate for a permanent interference field component and is fed with constant current.
  • a second coil is used to compensate for an interference field component induced by the earth field and is supplied with current depending on the earth field and the course.
  • the X-Y-Z coordinate system is assumed to be fixed, i.e. is aimed at the generator of the magnetic interference field - in the exemplary embodiment the ship.
  • the coils are in turn named according to their main magnetic direction effects.
  • the coils according to FIG la which are parallel to the Y-Z plane, are the L coils (L-MES winding), whose magical axes of action lie in the ship's longitudinal direction (x) (L corresponds to longitudinal).
  • the coils according to FIG 1b (only one is shown), which are parallel to the XY plane, are the V-coils (V-MES winding) with vertical magnetic axes (V corresponds to vertical).
  • the coils according to FIG 1c which are parallel to or in the XZ plane, are the A-coils (A-MES winding) with the magnetic direction of action in the Y-direction (A corresponds to athwort-ship).
  • the coils come with. Feeds direct currents in different directions.
  • the positive current directions result from the positive directions of the coordinate system shown in FIG. 1a.
  • the currents are set so that the ship's own magnetic field is optimally compensated for.
  • a controller ensures that the set compensation is retained by controlling the current values.
  • the invention relates to the magnetic measurement of a ship.
  • This measurement is carried out in the usual manner in that, according to FIG. 2, the ship 1 is brought into a measurement system with a heating carpet of magnetic field measuring probes 2 and the coil currents are set in such a way that the natural field is optimally compensated for.
  • the determination of the optimal coil currents in the shortest possible time is the typical problem of magnetic measurement.
  • the measuring probes 2 are arranged in two different measuring levels in order to be able to make a statement at different measuring depths.
  • the measuring probes measure the magnetic field of the ship 1 in size and direction.
  • the ship's own field to be compensated is measured.
  • the eigenfield measured values are saved.
  • all the coils of the MES system are successively charged with a measuring current of a defined size and direction and the magnetic fields (measuring field) of the coil being measured are measured.
  • the "winding effect” is determined as follows:
  • the magnetic field of a system consisting of several, in total Nsp coils, is obtained by summing up the fields of the individual coils at a point n according to location: (1.6)
  • the - development effects and the correction of the coil data are determined as follows:
  • the measurement value scatter G serves as a weighting variable and has the effect that measurement values are taken into account less the larger their scatter.
  • Formula (1.11) represents a system of equations with which improvements ⁇ U can be calculated for a predefined approximation of the quantities U0 sought.
  • Formula (1.8) then gives the improved variables U 0 + 1 ', which in turn lead to the calculation of new improvements ⁇ U 0 + 1 .
  • This iteration - using convergence-securing procedures - must be repeated until a minimum of the mean square of error has been established or until two successive approximations no longer differ significantly from one another. The result is the winding effect Pi and the corrected coil position coordinates for the coil under investigation.
  • the compensation currents are now to be determined, ie the task of determining the currents I K in the individual coils of an MES coil system is concerned, so that the magnetic self-field measured in the "unprotected vehicle" state is canceled as well as possible .
  • the measured values are now also subject to a scatter G n, i ; the underlying measurement error distribution is normal with the mean value 0.
  • the sought compensation currents in the coils should generate a magnetic field which approximates or eliminates the measured vehicle's own field at the locations Xm in the sense of the smallest square of errors.
  • RS n, i the compensation magnetic field generated by all coils of the system in the N measuring points; if you use the formal expression (1.6), the mean square of the error becomes:
  • the currents I K are obviously a linear influencing variable; the minimum of the mean square of the error is thus without iteration for a.
  • the "winding effects” i.e. a value that takes into account the realities of the ship, which depends on the material properties of the outer wall to be penetrated in real terms and the real built-in parts, and the recovery of a correction of the inaccurate coil geometry data.
  • the winding effect ultimately describes the relationship of the field of a real coil 3 or 4 or 5 located in the ship 1, the field of which is changed by the ferromagnetic masses of built-in parts and the outer skin and a correspondingly undisturbed air coil field.
  • the compensation that can be achieved by the method according to the invention is better adapted to reality (that in a mathematical model so cannot be represented comprehensively), ie it is thereby much more accurate, especially since coil errors are also detected or corrected, which in the case of a mathematical model also cannot be taken into account sufficiently correctly.
  • Compensation currents are determined from the measured own field of the ship using the winding effects. After one or more optimization steps (computational optimization), the super-positioned field of the individual MES coils gives the measured vehicle own field with the opposite sign. The individual compensation currents are thus determined.
  • essential data are stored in a database, for example the winding currents causing the compensation according to size and direction (switching state of the coils), the (corrected) coil data, the winding effects.
  • the induced fields not only have information value, but can also be used for error determination.
  • the functions for the compensation of the horizontal and vertical induced fields are fixed, once determined for a ship, and are only dependent on the disturbances "course" and "area of application”.
  • the MES control system is responsible for correcting the course dependency. If the area of application changes, the feeds of the MES to compensate for the induced components are easy to determine. If extensive conversions have been carried out on a ship, the induced field determination must be carried out again.
  • FIG. 3 shows a data flow plan "database creation" for a ship database 3.
  • This data flow plan contains not only the actual technical values but also the necessary secondary data, steps for data checking and data management.
  • the switching states and coil currents of the MES system are transmitted to the measuring point 4 and measured with the ones stored in the ship database 3 until the measurement of the ship 1, as shown in FIG then compared current values.
  • MES setting The associated data flow diagram "MES setting" is shown in FIG. 5, with measured value transmission positions being identified by lightning symbols.
  • the ship is then measured with the MES system switched on and if necessary, it is carried out using the information the database is recalculated or readjusted the MES compensation currents in accordance with the method described in the third setting step of the initial setting with a subsequent control measurement as to whether the desired minimization has been achieved, and an update of the ship database.
  • Magnetic measurement and recording of the data can take place in a stationary system or in an overflow process in a land or ship-based probe system with distance determination.
  • the setting data is expediently transferred using a display.
  • the setting data is expediently transferred to the automatic control cabinet in the ship or to the MES on-board computer.
  • the number of measurements can be limited to an arrival and a discharge measurement.
  • the MES systems it is advantageously possible for the MES systems to be set quickly, precisely and reproducibly even at measuring points which do not have a measuring carpet, or the method allows MES setting with a mobile measuring system, i.e. from a surveying ship with a route determination for the object to be surveyed.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Magnetic Variables (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Magnetic Ceramics (AREA)
  • Ticket-Dispensing Machines (AREA)
EP19870106093 1986-04-29 1987-04-27 Verfahren zur Einstellung einer magnetischen Eigenschutz (MES)-Anlage zur Kompensation des magnetischen Störfeldes eines Fahrzeuges, insbesondere Schiffes Expired - Lifetime EP0247367B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614527 1986-04-29
DE19863614527 DE3614527A1 (de) 1986-04-29 1986-04-29 Verfahren zur einstellung einer magnetischen eigenschutz (mes) - anlage zur kompensation des magnetischen stoerfeldes eines fahrzeuges, insbesondere schiffes

Publications (2)

Publication Number Publication Date
EP0247367A1 EP0247367A1 (de) 1987-12-02
EP0247367B1 true EP0247367B1 (de) 1991-02-27

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EP19870106093 Expired - Lifetime EP0247367B1 (de) 1986-04-29 1987-04-27 Verfahren zur Einstellung einer magnetischen Eigenschutz (MES)-Anlage zur Kompensation des magnetischen Störfeldes eines Fahrzeuges, insbesondere Schiffes

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EP (1) EP0247367B1 (enrdf_load_stackoverflow)
DE (1) DE3614527A1 (enrdf_load_stackoverflow)
NO (1) NO871767L (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3936985C2 (de) * 1989-11-07 1994-12-22 Bundesrep Deutschland Verfahren und Vorrichtung zur Kompensation von objekteigenen magnetischen Störfeldern, insbesondere bei Schiffen, mittels feldgeregelter magnetischer Eigenschutzanlage
FR2659787B1 (fr) * 1990-03-16 1994-08-26 Thomson Csf Procede de compensation automatique des aimantations induites par le champ magnetique terrestre dans les materiaux ferromagnetiques, notamment compris dans un batiment naval.
FR2679514A1 (fr) * 1991-07-23 1993-01-29 Thomson Csf Station portable de mesure et de reglage de la signature magnetique d'un batiment naval.
SE9301426D0 (sv) * 1993-04-28 1993-04-28 Asea Brown Boveri Ab Aktiv daempning av kraftfrekventa magnetfaelt
FR2768394B1 (fr) * 1997-09-12 1999-12-03 Thomson Marconi Sonar Sas Procede pour minimiser la signature magnetique d'un batiment naval
DE102018003250B3 (de) 2018-04-20 2019-06-19 Bundesrepublik Deutschland, vertr. durch das Bundesministerium der Verteidigung, vertr. durch das Bundesamt für Ausrüstung, Informationstechnik und Nutzung der Bundeswehr Verfahren zur magnetischen Signaturvermessung
AU2021375080B2 (en) * 2020-11-05 2023-11-23 Mission Systems Holdings Pty Ltd. A device and method for disabling an undersea mine, an underwater transport and methods therefor

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2929964C2 (de) * 1979-07-24 1984-08-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur Kompensation von magnetischen Störfeldern von Objekten mittels magnetischer Eigenschutzanlagen
DE3122686A1 (de) * 1981-06-06 1983-02-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Anordnung zur kompensation magnetischer eigenfelder von beweglichen koerpern
DE3132933C2 (de) * 1981-08-20 1984-09-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verfahren zur Bestimmung der Wicklungsströme in magnetischen Eigenschutz (MES)-Anlagen
FR2587969B1 (fr) * 1985-09-27 1991-10-11 Thomson Csf Dispositif de desaimantation, notamment pour batiments navals
DE3681281D1 (de) * 1985-10-18 1991-10-10 Secr Defence Brit Magnetisches selbstmessungssystem fuer schiffe.

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Publication number Publication date
NO871767D0 (no) 1987-04-28
EP0247367A1 (de) 1987-12-02
DE3614527C2 (enrdf_load_stackoverflow) 1990-12-13
DE3614527A1 (de) 1987-11-05
NO871767L (no) 1987-10-30

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