EP1877720A1 - Module de protection pour proteger des objets au moyen d'un courant electrique contre des menaces, notamment contre des charges creuses - Google Patents

Module de protection pour proteger des objets au moyen d'un courant electrique contre des menaces, notamment contre des charges creuses

Info

Publication number
EP1877720A1
EP1877720A1 EP06724724A EP06724724A EP1877720A1 EP 1877720 A1 EP1877720 A1 EP 1877720A1 EP 06724724 A EP06724724 A EP 06724724A EP 06724724 A EP06724724 A EP 06724724A EP 1877720 A1 EP1877720 A1 EP 1877720A1
Authority
EP
European Patent Office
Prior art keywords
electrode
shaped charge
electrode material
facing
charge jet
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
EP06724724A
Other languages
German (de)
English (en)
Other versions
EP1877720B1 (fr
Inventor
Matthias Wickert
Karsten Michael
Jürgen KUDER
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP1877720A1 publication Critical patent/EP1877720A1/fr
Application granted granted Critical
Publication of EP1877720B1 publication Critical patent/EP1877720B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/007—Reactive armour; Dynamic armour

Definitions

  • Protection module for the protection of objects with electric current against threats, in particular by shaped charges
  • the present invention relates to a protection module for the protection of objects with electric current against threats, in particular by shaped charges.
  • various protection mechanisms For protection of objects, such as battle tanks, against shaped charges are already used various protection mechanisms.
  • a protective mechanism provides to disturb shaped charge beams by electric current.
  • the basic operating principle of this electrical protection mechanism is to couple an electric current by means of two electrode plates in the beam generated by the hollow charge, which then leads to a disturbance of the beam.
  • Hollow charge jets are generated in the detonation of an explosive explosive device around a conical or hemispherical metal insert and are particularly suitable for penetrating armor.
  • Such shaped charge jets are characterized by a unidirectionally directed, forming in the course of detonation matter beam.
  • the shaped charge jet has speeds in the range of about 7 km / s to 10 km / s at the top.
  • the materials of the armor behave on the order of several hundred GPa due to the jet pressure occurring due to the high jet velocity, so to speak as liquids, so that the shaped charge jet penetrates the laminate materials according to the laws of hydrodynamics, which ultimately justifies the high breakdown power of such shaped charge jets.
  • an electric current along the shaped charge jet can only occur as soon as the tip of the shaped charge jet 1 appears on the electrode 3 facing the object 5 and thus establishes a conductive connection between the two electrodes 2, 3. Since the shaped charge jet 1 has good electrical conductivity, a high current of several 100 kA can flow between the electrode plates as the shaped charge beam passes through both electrodes. However, the electrical current along the beam 1 can only flow through a portion of the shaped charge jet between the electrodes as long as this jet portion is located between the electrode plates and has not yet emerged from the rear electrode.
  • the pulse power supply 4 to the passage time of the shaped charge jet 1, for example, such that the current flow in the form of an over-damped oscillation and the duration of the first half-wave is tuned to the passage duration of the shaped charge jet.
  • the tip of the shaped charge jet can propagate at a very high speed of 7 km / s or more, and thus passes both electrode plates, which are located a few cm apart, within a few microseconds. Therefore, in particular, the time period for the current injection into the tip of the shaped charge jet is only short and thus the possibility of achieving a beam cross-section widening - especially since the current can increase only with a limited also dependent on the inductance of the circuit, limited rate of change.
  • DE 40 34 401 A1 discloses a generic electromagnetic armor with two plates arranged at a distance, which are connected in parallel via at least one capacitor and are electrically rechargeable.
  • a multiple plate armor can be found in WO 2004/057262 A2, with at least one plate consisting of electrostrictive or magnetostrictive material.
  • No. 6,622,608 B1 describes a plate armor comprising two distance-variable plates whose mutual spacing can be adjusted as required by means of electromagnetic repulsion forces between the plates.
  • DE 42 44 564 C2 discloses a sandwich structure-like protective element which has a coil and / or capacitor arrangement by which adjacent protective plates can be accelerated in order to reduce the penetration depth of an approaching shaped-charge projectile into the structure.
  • the invention has for its object to provide a device for protecting an object against shaped charge jets with an electrode assembly, the at least one object and at least one object facing away from the electrode, between which an electrical voltage can be applied, form such that a significant improvement the disintegration effect on the shaped charge jet becomes possible, which is comparable to a wire explosion.
  • the measures required for this purpose are intended to be technically simple and easy to use take into account cost-effective implementation and in particular be realized with the lowest possible weight.
  • a device for protecting an object against shaped charge jets with an electrode arrangement according to the preamble of claim 1 is characterized in that the electrode facing the object has at least one area with a spatially heterogeneous electrode material, which preferably provides a lower material density compared to steel whereby the thickness formation of the electrode facing the object can be made significantly larger compared to a designed as a steel plate, the object-facing electrode without causing an absolute weight gain for the device according to the solution would necessarily be connected.
  • the electrode material should have a very good electrical conductivity, in order to ensure that a pronounced electrical current flow along the shaped charge jet is formed when two electrically opposed electrodes pass through one another.
  • the object facing electrode turns out to be light metal foam material, such as an open-cell aluminum foam with a relative density of 6% in relation to the density of an aluminum solid material electrode.
  • Said aluminum foam is characterized by corresponding air pockets and by a high porosity.
  • Electrodes conceivable that are able to bring a large electric current to the penetration point of the shaped charge jet.
  • Such a structure could, for example, have an inner honeycomb structure.
  • material processing of possible electrode structures offer primarily chemical or physical deposition or vapor deposition, as well as chemical or physical Materialabtrageluie, such as chemical etching or abrading material erosion.
  • an electrode of an ordered or disorderly mesh each consisting of at least one electrically conductive, wire-like conductor material.
  • the formation of an electrode in the form of a wire mesh made of copper wire would be an electrode form which can be used with advantage.
  • the region acted upon by the shaped charge jet reacts with a strong displacement of the heterogeneous electrode material away from the beam axis. This results in an increased distance of the remaining heterogeneous electrode material in the radial direction to the beam axis - while the tip of the shaped charge jet penetrates deeper into the heterogeneous region of the electrode material, forming a locomotive crater reason.
  • the beam tip forms a good electrical contact, via which a high current can be coupled into the shaped charge jet.
  • the current coupled in here can contribute to disturbing the entire beam section from the tip of the shaped charge jet to the first electrode 2.
  • the current injection is reduced to behind-the-jet areas due to the large distance of the displaced when passing the beam tip to the side of the material.
  • This reduces current paths which do not contribute to the disintegration of the shaped charge jet up to the beam tip.
  • the solid material forms a solid crater wall with only a small distance from the shaped charge jet, whereby a current injection behind the tip is facilitated.
  • the associated current paths no longer lead via the tip of the shaped charge jet and are therefore detrimental to an effective disturbance of the beam tip.
  • stripping plate in the following.
  • the stripper plate is preferably penetrated by the shaped charge jet with a very small crater diameter, while metallic particles are retained as far as possible after the breakdown of the first electrode and a shell of ionized particles around the actual shaped charge jet.
  • parasitic current paths between the two electrodes are reduced to the flow of current in the shaped charge beam, but not in the vicinity of the hollow charge jet through this and thus do not contribute to the disturbance of the shaped charge jet.
  • the current flow is thus concentrated on the "stripped" shaped charge jet.
  • FIG. 1 is a schematic representation of a solution according trained protection arrangement, Fig. 2 protection arrangement according to the prior art.
  • Fig. 1 is a schematic diagram of the solution designed according to the protection arrangement is shown against shaped charge jets.
  • the two image sequences shown in FIG. 1 each show a shaped charge jet 1, which penetrates from the left a front electrode 2 facing away from the object 5 and further propagates to the right.
  • the front electrode 2 is arranged downstream of a stripper plate 6 formed of electrically insulating material, which consists for example of polypropylene.
  • a so-called back electrode 3 is provided, which is formed porous in the embodiment shown and includes individual cavities, as can be seen in principle from the plurality of boxes shown.
  • An insulating stripper plate 6 is provided between the two electrodes 2 and 3.
  • the stripper plate 6 suppresses parasitic current paths, i. it ensures that between both electrodes 2 and 3, a current flow takes place exclusively through and along the shaped charge jet 1.
  • the tip of the shaped charge jet 1 so interacts with the back electrode 3, that there is a significant lateral cratering 8 within the back electrode 3 during the passage of the shaped charge jet 1 through the back electrode 3.
  • Current considerations assume that, precisely because of this strong lateral crater effect 8, the coupling of the current into the beam is concentrated on the region of the tip of the shaped charge jet 1 at the crater bottom and the location of the current injection with the crater bottom moves through the heterogeneous region of the electrode 3 , This allows a time-prolonged coupling of electric current through the beam tip.
  • This situation could also be referred to as a dynamic electrode, since the electrode edge effective for current injection, the crater ground, moves with the tip of the shaped charge jet.
  • the duration of the current injection into the tip of the shaped charge jet can be influenced by the length of the possible path through the heterogeneous region of the electrode material. The result is an extension of the current injection through the tip of the shaped charge jet, as a result of a strong disintegration of the shaped charge jet including the tip can be achieved as in a wire explosion, so that caused by the shaped charge jet penetration effect on one in the beam direction of the back electrode 3 to ordered object 5 is significantly reduced.
  • the electrode thickness of the back electrode 3 is made larger, the weight of the electrode assembly is not necessarily increased compared to conventional steel electrode plates, especially since the back electrode 3 is made of porous material having air inclusions whose specific gravity is significantly lower than that of an electrode Solid material is
  • Porous materials or structured electrode materials with enclosed cavities of the order of magnitude of the hollow charge jet diameter of up to several millimeters have proved to be particularly advantageous On the one hand allow an effective disturbance of the shaped charge jet and on the other hand contribute to a low weight of the armor.
  • the front electrode 2 or the electrode facing away from the object was an aluminum plate with a plate thickness of 6 mm.
  • an insulating stripper plate with a thickness of 15 mm, consisting of polypropylene, has been arranged.
  • a 120 mm thick aluminum foam electrode has been arranged downstream of the electrode facing the object, the relative density of which was 6% compared to the solid material.
  • the aluminum foam electrode in turn was cast on a 10 mm thick aluminum base, which in turn was attached to a 6 mm thick aluminum plate with good electrical contact.
  • the cast-on aluminum base ensured a good electrical connection to the reticulated aluminum foam structure.
  • the rearmost plate was used to supply power and to support the structure.
  • a voltage of 10 kV was applied between the electrodes by means of a high voltage capacitor. It could be shown that when carrying out a bombardment of the above electrode arrangement with a shaped charge jet, no appreciable parts of the shaped charge jet were able to penetrate the rearmost aluminum plate in the jet direction. In the exemplary embodiment, this plate is not yet designed to catch entrained fragments or the possibly not yet stopped bolt of the shaped charge. With the identical experimental setup, but without the application of a high voltage between the two electrodes, it was found that the hollow charge jet applied to the electrode arrangement was able to penetrate the structure almost unhindered. It could thus be shown that the protective effect against shaped charge jets decisively and clearly depends on the coupling of electric current, which could be significantly improved with the electrode arrangement used here. LIST OF REFERENCE NUMBERS

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Particle Accelerators (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Elimination Of Static Electricity (AREA)
EP06724724A 2005-05-04 2006-05-04 Module de protection pour proteger des objets au moyen d'un courant electrique contre des menaces, notamment contre des charges creuses Not-in-force EP1877720B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005021348A DE102005021348B3 (de) 2005-05-04 2005-05-04 Schutzmodul zum Schutz von Objekten mit elektrischem Strom gegen Bedrohungen, insbesondere durch Hohlladungen
PCT/EP2006/004207 WO2006117232A1 (fr) 2005-05-04 2006-05-04 Module de protection pour proteger des objets au moyen d'un courant electrique contre des menaces, notamment contre des charges creuses

Publications (2)

Publication Number Publication Date
EP1877720A1 true EP1877720A1 (fr) 2008-01-16
EP1877720B1 EP1877720B1 (fr) 2011-07-27

Family

ID=36642315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06724724A Not-in-force EP1877720B1 (fr) 2005-05-04 2006-05-04 Module de protection pour proteger des objets au moyen d'un courant electrique contre des menaces, notamment contre des charges creuses

Country Status (5)

Country Link
US (1) US8006607B2 (fr)
EP (1) EP1877720B1 (fr)
AT (1) ATE518109T1 (fr)
DE (1) DE102005021348B3 (fr)
WO (1) WO2006117232A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015187013A1 (fr) 2014-06-02 2015-12-10 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Blindage réactif électrique

Families Citing this family (8)

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US8091464B1 (en) * 2007-10-29 2012-01-10 Raytheon Company Shaped charge resistant protective shield
WO2010082970A2 (fr) * 2008-10-23 2010-07-22 University Of Virginia Patent Foundation Blindages réactifs topologiquement contrôlés pour protection et procédé associé
DE102009038630A1 (de) 2009-08-26 2011-04-28 Rheinmetall Waffe Munition Gmbh Schutzmodul für ein Objekt gegen insbesondere Hohlladungsgeschosse
DE102010019475A1 (de) 2010-05-05 2011-11-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zum Schutz eines Objektes wenigstens gegen Hohlladungsstrahlen
KR101312320B1 (ko) 2013-06-25 2013-09-27 국방과학연구소 전자기 장갑 및 이를 구비하는 차량 방호 시스템
US9422745B2 (en) * 2014-05-09 2016-08-23 Leslie Ho Leung Chow Safe with nitinol wire locking mechanism
US10215535B2 (en) * 2015-03-20 2019-02-26 The Boeing Company System, method, and assembly for adaptively shielding a structure
GR1010011B (el) * 2020-06-05 2021-05-25 Ανδρεας Παντελεημωνος Ζηνας Προσθετο συστημα τριων επιπεδων για την ενισχυση της δυναμικης θωρακισης αρματων μαχης με χρηση συμπιεσμενης σιδηρομαγνητικης σκονης και ηλεκτρομαγνητικης ενισχυσης

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015187013A1 (fr) 2014-06-02 2015-12-10 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Blindage réactif électrique
US9897418B2 (en) 2014-06-02 2018-02-20 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Electric reactive armour

Also Published As

Publication number Publication date
DE102005021348B3 (de) 2006-12-28
ATE518109T1 (de) 2011-08-15
US20090199701A1 (en) 2009-08-13
WO2006117232A1 (fr) 2006-11-09
US8006607B2 (en) 2011-08-30
EP1877720B1 (fr) 2011-07-27

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