EP0971200A1 - Akustische Munition - Google Patents

Akustische Munition Download PDF

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Publication number
EP0971200A1
EP0971200A1 EP99401658A EP99401658A EP0971200A1 EP 0971200 A1 EP0971200 A1 EP 0971200A1 EP 99401658 A EP99401658 A EP 99401658A EP 99401658 A EP99401658 A EP 99401658A EP 0971200 A1 EP0971200 A1 EP 0971200A1
Authority
EP
European Patent Office
Prior art keywords
tube
cover
nozzles
fuel
ammunition
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
EP99401658A
Other languages
English (en)
French (fr)
Other versions
EP0971200B1 (de
Inventor
Pascal Tarayre
Dominique Broussoux
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.)
TDA Armements SAS
Original Assignee
TDA Armements SAS
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 TDA Armements SAS filed Critical TDA Armements SAS
Publication of EP0971200A1 publication Critical patent/EP0971200A1/de
Application granted granted Critical
Publication of EP0971200B1 publication Critical patent/EP0971200B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information

Definitions

  • the present invention relates to a usable acoustic munition in an area defense or restraint weapon system work of non lethal air acoustics sound frequency weapons very low and very high intensity to put out crowds or individuals by creating reversible physical disorders at home.
  • Low frequency and high acoustic wave generators intensity is one of the current research topics in non-lethal weapons. Their use exploits the fact that the propagation distance of the wave allows a strike out of range of the shock wave produced which increases their discretion especially when it comes to infrasonic waves not noticeable by hearing.
  • the infrasonic or low acoustic wave generators known frequencies operating in air or water have characteristics which depend on their frequency of work, the type of energy source they use and the medium in which the waves acoustics are propagated.
  • the energy sources it is known to use pneumatic acoustic sources, sources thermoacoustics and wind acoustic sources.
  • the infrasound pneumatic sources have the disadvantage of being very bulky because they generally use a modulation device of air flow associated with an adaptation pavilion of several meters length.
  • Thermoacoustic sources make it possible to generate a wave of high intensity, but their dimension is also very important because they require the use of a heat engine, exchanging energy between two sources of heat, cold and hot producing work mechanical only in the form of an acoustic wave.
  • the object of the invention is to overcome the aforementioned drawbacks.
  • the subject of the invention is an acoustic munition characterized in that it comprises a metal tube closed to a end with a bottom and closed at its other end with a cover removable, heating nozzles attached to the bottom, a honeycomb stack placed inside the tube above the heating nozzles, a source energy for the fuel and fuel supply to the heating enclosed inside an aerodynamic cover, fixed on the bottom of the tube on the outside, an empennage with deployable fins and a propellant charge both attached to the outside of the tube on the cover removable, a pyrotechnic cutter placed between the cover and the tube to eject the cover upon arrival of the end of flight of the ammunition on the ground, and a piezoelectric sensor coupled to at least one igniter of the nozzles heating, power source and pyrotechnic cutter for order the lid to be ejected, send the oxidant and fuel on the heating nozzles and trigger noise production on the resonance frequency of the tube by the exchange of energy between the bottom of the tube and its end in contact with ambient air when the
  • the ammunition can be advantageously launched by a barrel of medium caliber firing by mortar effect at a distance of 100 to 200 meters.
  • the emission emits a loud noise, of the order from 120 dB to 130 dB (referenced to 20 ⁇ Pa) and low frequencies less than 200 HZ for a period of several minutes.
  • Level sound obtained is dissuasive.
  • it offers the possibility of being able to be fired from a distance, beyond an area to be protected, for example what can in this case limit the fratricidal effects linked to omnidirectional radiation of the sound wave.
  • the ammunition according to the invention which is represented according to the view in section of FIG. 1 comprises a tube 1 of compatible external diameter with that of a gun from 70 to 80 mm for example and length of approximately 40 cm operating in a quarter wave resonator mode.
  • Cap 3 increases its reach without as much to consume a large mass of powder. It reduces the acceleration of the tee shot and the forces induced in the structure of the ammunition.
  • the other end 1b of the tube 1 is closed by a cover 4 supporting a folding tail unit 5 intended to ensure stability aerodynamics of the ammunition during flight.
  • This empennage can be produced in the form of four fins mounted on the cover, and maintained for example in the deployed position by return springs with stop not shown. This allows as shown in Figure 2 a wedging of the fins with an appropriate arrow of 45 degrees for example, in the deployed position.
  • a stack 8 in honeycomb structure is arranged at a distance determined near the bottom 2 of the tube 1 in front of several nozzles 9 of the type torch fixed on the bottom 2 and optimally arranged to have a homogeneous heat flow in the space separating the bottom 2 of the tube 1 from the battery 8.
  • Battery 8 allows the production of noise by thermoacoustic effect whose frequency is inversely proportional to the length L of the tube 1.
  • the nozzles are supplied by a energy source comprising a combined oxidizer and fuel respectively acetylene and oxygen for example, stored in capsules 11 and 12 arranged inside the cap 3 and controlled by solenoid valves not shown.
  • An electric arc type igniter 13 obtained by discharging a capacitor or any equivalent device, is placed to the right of the nozzle outlet nozzle 9.
  • a reserve of black powder 14 is fixed to the outside of the tube 1 on the cover 4. This reserve of black powder must allow for example the propulsion of the ammunition by a mortar 15, as shown in the figure 2, over distances of, for example, between 100 and 200 meters.
  • the piezoelectric sensor 7 emits a signal to destination of the pyrotechnic cutter to separate, as shown in the Figure 3, the cover 4 and the fins of the ammunition.
  • Nozzles 9 are then lit by igniter 13 and by solenoid valves, not shown, which release the oxidizer and fuel stored in capsules 11 and 12.
  • the sound power radiated by the tube is defined by the relation:
  • the acoustic power Pmoy which can be obtained is of the order of 12 W.
  • This power corresponds to a sound intensity of 0.1 mW / cm 2 and at a noise level of around 120 dB at 1 meter from the source.
  • the oxy-acetylene combustion produces a lower calorific value of the order of 44KJ / gr. This corresponds to a flow rate of 0.16 gr / min.
  • Autonomy of around 30 minutes consumes 5 g of acetylene under these conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Exhaust Silencers (AREA)
EP19990401658 1998-07-07 1999-07-02 Akustische Munition Expired - Lifetime EP0971200B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9808685 1998-07-07
FR9808685A FR2781044B1 (fr) 1998-07-07 1998-07-07 Munition acoustique

Publications (2)

Publication Number Publication Date
EP0971200A1 true EP0971200A1 (de) 2000-01-12
EP0971200B1 EP0971200B1 (de) 2002-11-13

Family

ID=9528358

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990401658 Expired - Lifetime EP0971200B1 (de) 1998-07-07 1999-07-02 Akustische Munition

Country Status (3)

Country Link
EP (1) EP0971200B1 (de)
DE (1) DE69903885T2 (de)
FR (1) FR2781044B1 (de)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2247111A (en) * 1937-07-10 1941-06-24 Batchelor Acoustical projectile
US2836033A (en) * 1953-07-15 1958-05-27 Bell Telephone Labor Inc Heat-controlled acoustic wave system
US3457862A (en) * 1967-12-19 1969-07-29 Us Army Noisemaking device
US4245403A (en) * 1978-01-20 1981-01-20 Jan Hipp Apparatus for displaying the detonating, light flash and smoke development of ammunition
US4664631A (en) * 1985-10-31 1987-05-12 Loral Electro-Optical Systems, Inc. Surrogate weapon for weapons effects signatures
US4948360A (en) * 1986-11-06 1990-08-14 The Haser Company Limited Gas resonance device
US5369625A (en) * 1991-05-31 1994-11-29 The United States Of America As Represented By The Secretary Of The Navy Thermoacoustic sound generator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2247111A (en) * 1937-07-10 1941-06-24 Batchelor Acoustical projectile
US2836033A (en) * 1953-07-15 1958-05-27 Bell Telephone Labor Inc Heat-controlled acoustic wave system
US3457862A (en) * 1967-12-19 1969-07-29 Us Army Noisemaking device
US4245403A (en) * 1978-01-20 1981-01-20 Jan Hipp Apparatus for displaying the detonating, light flash and smoke development of ammunition
US4664631A (en) * 1985-10-31 1987-05-12 Loral Electro-Optical Systems, Inc. Surrogate weapon for weapons effects signatures
US4948360A (en) * 1986-11-06 1990-08-14 The Haser Company Limited Gas resonance device
US5369625A (en) * 1991-05-31 1994-11-29 The United States Of America As Represented By The Secretary Of The Navy Thermoacoustic sound generator

Also Published As

Publication number Publication date
EP0971200B1 (de) 2002-11-13
FR2781044A1 (fr) 2000-01-14
FR2781044B1 (fr) 2000-10-06
DE69903885T2 (de) 2003-09-11
DE69903885D1 (de) 2002-12-19

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