EP0971200A1 - Acoustic ammunition - Google Patents

Acoustic ammunition 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
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Prior art keywords
tube
cover
nozzles
fuel
ammunition
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Granted
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EP99401658A
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German (de)
French (fr)
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EP0971200B1 (en
Inventor
Pascal Tarayre
Dominique Broussoux
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TDA Armements SAS
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TDA Armements SAS
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    • 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.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Exhaust Silencers (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The acoustic munition has an energy source which feeds fuel and oxidizer to nozzles when a cover (4) is ejected on ground impact to produce noise of the munition casing tube resonance frequency. The acoustic munition comprises: (a) a closed metal tube (1) with a removable cover (4) at one end; (b) internal heating nozzles (9) fixed on the tube base (2); (c) a honeycomb insert (8) above the nozzles; (d) an energy source for feeding fuel and oxidizer to the nozzles and enclosed within an external aerodynamic nose (3) fixed onto the base (2); (e) a deployable fin tail (5) and a propellant charge, both fixed externally on the removable cover (4); (f) a pyrotechnic charge (6) for ejecting the cover when the fired munition hits the ground; and (g) a piezoelectric sensor (7) coupled to a nozzle igniter, to the energy source and to the cutting charge for controlling cover ejection and supply of fuel and oxidizer to the nozzles and for triggering production of noise of the resonance frequency of the tube by energy exchange between the tube base (2) and its end (1b) in contact with ambient air when the cover is ejected.

Description

La présente invention concerne une munition acoustique utilisable dans un système de défense de zone ou d'arme de contrainte mettant en oeuvre des armes non létale d'acoustique aérienne de fréquence sonore très basse et de très forte intensité pour mettre hors d'état de nuire des foules ou des individus en créant chez eux des désordres physiques réversibles.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.

Elle permet notamment de réprimer des manifestations sans effusion de sang ou de maintenir une foule à distance de sécurité.It allows in particular to suppress demonstrations without effusion blood or keep a crowd at a safe distance.

Les générateurs d'onde acoustique à basse fréquence et de forte intensité font partie des thèmes de recherche en arme non létale actuels. Leur utilisation exploite le fait que la distance de propagation de l'onde permet une frappe hors de portée de l'onde de choc produite ce qui augmente leur discrétion notamment lorsqu'il s'agit d'ondes infrasonores non perceptibles à l'ouïe.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.

Les générateurs d'onde acoustique infrasonores ou basses fréquences connus fonctionnant dans l'air ou dans l'eau ont des caractéristiques qui dépendent de leur fréquence de travail, du type de source énergétique qu'ils emploient et du milieu dans lequel les ondes acoustiques sont propagées. Parmi les sources d'énergie il est connu d'utiliser des sources acoustiques pneumatiques, des sources thermoacoustiques et des sources acoustiques éoliennes.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. Among the energy sources it is known to use pneumatic acoustic sources, sources thermoacoustics and wind acoustic sources.

Les sources pneumatiques infrasonores ont l'inconvénient d'être très encombrantes car elles utilisent généralement un dispositif de modulation d'écoulement de l'air associé à un pavillon d'adaptation de plusieurs mètres de longueur.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.

Les sources thermoacoustiques permettent de générer une onde de forte intensité, mais leur dimension est aussi très importante car elles nécessitent d'utiliser un moteur thermique, échangeant de l'énergie entre deux sources de chaleur, froide et chaude en produisant un travail mécanique uniquement sous forme d'onde acoustique.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.

Dans des tailles beaucoup plus réduites il est connu d'utiliser des sources acoustiques éoliennes entraínées dans l'air par le mouvement d'une cavité résonnante qui leur est associée. Cependant leur temps de fonctionnement est limité par la durée de vol avec l'inconvénient que le point d'émission évolue tout au long de la trajectoire.In much smaller sizes it is known to use Aeolian acoustic sources entrained in the air by the movement of a resonant cavity associated with them. However their time of operation is limited by the flight time with the disadvantage that the point emission evolves throughout the trajectory.

Le but de l'invention est de pallier les inconvénients précités.The object of the invention is to overcome the aforementioned drawbacks.

A cet effet l'invention a pour objet, une munition acoustique caractérisée en ce qu'elle comprend un tube métallique fermé à une extrémité par un fond et fermé à son autre extrémité par un couvercle amovible, des buses de chauffage fixées au fond, une pile en nid d'abeille disposée à l'intérieur du tube au dessus des buses de chauffage, une source d'énergie pour l'alimentation en comburant et carburant des buses de chauffage enfermée à l'intérieur d'une coiffe aérodynamique, fixée sur le fond du tube à son extérieur, un empennage à ailettes déployables et une charge propulsive fixés tous les deux à l'extérieur du tube sur le couvercle amovible, un découpeur pyrotechnique placé entre le couvercle et le tube pour éjecter le couvercle à l'arrivée en fin de vol de la munition sur le sol, et un capteur piézo-électrique couplé à au moins un allumeur des buses de chauffage, à la source d'énergie et au découpeur pyrotechnique pour commander l'éjection du couvercle, l'envoie du comburant et du carburant sur les buses de chauffage et déclencher une production de bruit sur la fréquence de résonance du tube par l'échange d'énergie entre le fond du tube et son extrémité au contact de l'air ambiant lorsque le couvercle est éjecté.To this end, 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 cover is ejected.

La munition peut être avantageusement lancée par un canon de moyen calibre tirant par effet mortier à une distance de 100 à 200 mètres. Une fois l'impact au sol, l'émission émet un bruit de forte intensité, de l'ordre de 120 dB à 130 dB (référencé à 20 µPa) et de basses fréquences inférieures à 200 HZ pendant une durée de plusieurs minutes. Le niveau sonore obtenu est dissuasif. D'autre part, elle offre la possibilité de pouvoir être tirée à distance, au delà d'une zone à protéger par exemple ce qui peut dans ce cas limiter les effets fratricides liés au rayonnement omnidirectionnel de l'onde sonore. Par comparaison un générateur fixe de l'art antérieur du type de ceux qui ont été décrits précédemment ,devant remplir la même fonction mais avec une capacité de manoeuvre moindre, devra fournir une intensité sonore supérieure à 175 dB à 1 mètre pour fournir 130 dB à 150 mètres avec l'inconvénient d'être de très grande dimension.The ammunition can be advantageously launched by a barrel of medium caliber firing by mortar effect at a distance of 100 to 200 meters. Once the impact on the ground, the emission emits a loud noise, of the order from 120 dB to 130 dB (referenced to 20 µPa) and low frequencies less than 200 HZ for a period of several minutes. Level sound obtained is dissuasive. On the other hand, 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. By comparison, a fixed generator of the prior art of the type of those which have been described previously, having to fulfill the same function but with less maneuverability, will have to provide a sound intensity greater than 175 dB at 1 meter to provide 130 dB at 150 meters with the disadvantage of being very large.

D'autres caractéristiques et avantages de l'invention apparaítront dans la description qui suit faite en regard des dessins annexés qui représentent:

  • La figure 1 une vue en coupe d'un mode de réalisation d'une munition selon l'invention
  • Les figure 2 et 3 des représentations simplifiées de la munitions dans ses phases de lancements et d'atterrissage au sol.
    • Other characteristics and advantages of the invention will appear in the following description given with reference to the appended drawings which represent:
  • Figure 1 a sectional view of an embodiment of a munition according to the invention
  • Figures 2 and 3 simplified representations of ammunition in its launch and landing phases.

    • La munition selon l'invention qui est représentée suivant la vue en coupe de la figure 1 comporte un tube 1 de diamètre extérieur compatible avec celui d'un canon de 70 à 80 mm par exemple et de longueur d'environ 40 cm fonctionnant suivant un mode résonateur quart d'onde.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.

    Une extrémité 1a du tube 1 est fermée par un fond 2 recouvert à l'extérieur du tube par une coiffe profilée 3 qui donne à la munition lorsqu'elle est en vol une traínée réduite. La coiffe 3 augmente sa portée sans pour autant consommer une masse de poudre importante. Elle permet de réduire l'accélération du coup de départ et les efforts induits dans la structure de la munition. One end 1a of the tube 1 is closed by a bottom 2 covered with the outside of the tube by a profiled cap 3 which gives the ammunition when it is in flight a reduced trail. 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.

    L'autre extrémité 1b du tube 1 est fermée par un couvercle 4 supportant un empennage repliable 5 destiné à assurer la stabilité aérodynamique de la munition en cours de vol. Cet empennage peut être réalisé sous la forme de quatre ailettes montées sur le couvercle, et maintenues par exemple en position déployée par des ressorts de rappel avec butée non représentés. Ceci permet comme le montre la figure 2 un calage des ailettes avec une flèche appropriée de 45 degrés par exemple, en position déployée.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.

    Un découpeur pyrotechnique 6 commandé par un capteur piézo-électrique 7 situé dans la coiffe 3 assure l'éjection du couvercle 4 et de l'empennage 5 hors du tube 1, lorsque la munition vient en fin de vol percuter le sol.A pyrotechnic cutter 6 controlled by a piezoelectric sensor 7 located in the cap 3 ejects the cover 4 and the empennage 5 out of the tube 1, when the ammunition comes at the end of flight hit the ground.

    Une pile 8 en structure de nid d'abeille est disposée à une distance déterminée près du fond 2 du tube 1 en face de plusieurs buses 9 de type chalumeau fixées sur le fond 2 et disposées de façon optimale pour avoir un flux de chaleur homogène dans l'espace séparant le fond 2 du tube 1 de la pile 8. La pile 8 permet par effet thermoacoustique la production d'un bruit dont la fréquence est inversement proportionnelle à la longueur L du tube 1. Pour éviter une déperdition de chaleur le fond 2 du tube est isolé de l'air ambiant par une couche isolante 10. Les buses sont alimentées par une source d'énergie comportant un comburant et un carburant composés respectivement d'acétylène et d'oxygène par exemple, stockés dans des capsules 11 et 12 disposées à l'intérieur de la coiffe 3 et commandées par des électrovannes non représentées. Un allumeur 13 de type arc électrique obtenu par décharge d'un condensateur ou tout dispositif équivalent, est placé au droit du bec de sortie des buses 9.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. To avoid heat loss the bottom 2 of the tube is isolated from the air ambient by an insulating layer 10. 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.

    Une réserve de poudre noire 14 est fixée à l'extérieur du tube 1 sur le couvercle 4. Cette réserve de poudre noire doit permettre par exemple la propulsion de la munition par un mortier 15, comme représenté sur la figure 2, sur des distances comprises par exemple entre 100 et 200 mètres.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.

    Une fois au sol, le capteur piézo-électrique 7 émet un signal à destination du découpeur pyrotechnique pour séparer, comme le montre la figure 3, le couvercle 4 et les ailettes de la munition. Les buses 9 sont alors allumées par l'allumeur 13 et des électrovannes, non représentées, qui libèrent le comburant et le carburant stockés dans les capsules 11 et 12. L'échange de chaleur entre les buses 9 situées au fond du tube 1 et l'extrémité froide 1b du tube 1 au contact de l'air ambiant au travers de la pile 8, produit un travail mécanique sous forme d'onde acoustique. Le tube constitue un résonateur quart d'onde dont la longueur d'onde de référence est définie par la relation λ=4L.Once on the ground, 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 heat exchange between the nozzles 9 located at the bottom of the tube 1 and the cold end 1b of the tube 1 in contact with the ambient air through the stack 8, produces mechanical work in the form of an acoustic wave. The tube constitutes a quarter wave resonator whose reference wavelength is defined by the relation λ = 4L.

    La puissance acoustique rayonnée par le tube est définie par la relation :

    Figure 00040001
    The sound power radiated by the tube is defined by the relation:
    Figure 00040001

    A titre exemple, en considérant une amplitude de pression dans le générateur PA de 0,2 bar ,un rayon R de 38 mm, une impédance de l'air standard : z=ρc=408 kg m-2 s-1, un nombre d'onde k=3,7 m-1 et une fréquence de 200 Hz, la puissance acoustique Pmoy qui peut être obtenue est de l'ordre de 12 W. Cette puissance correspond à une intensité sonore de 0,1 mW/cm2 et à un niveau de bruit de l'ordre de 120 dB à 1 mètre de la source. Avec un rendement de 10%, la combustion oxy-acétylénique produit un pouvoir calorifique inférieur de l'ordre de 44KJ/gr. Ceci correspond à un débit de 0,16 gr/mn. Une autonomie de l'ordre de 30 minutes consomme dans ces conditions 5 gr d'acétylène.For example, considering a pressure amplitude in the generator P A of 0.2 bar, a radius R of 38 mm, a standard air impedance: z = ρ c = 408 kg m -2 s -1 , a wave number k = 3.7 m -1 and a frequency of 200 Hz, 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. With a yield of 10%, 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.

    Naturellement, des ondes inférieures ou supérieures à 200 Hz peuvent aussi bien être produites, il suffit pour cela d'augmenter ou de diminuer la longueur du tube 1.Naturally, waves below or above 200 Hz can also be produced, it suffices to increase or decrease the length of the tube 1.

    Claims (6)

    Munition acoustique caractérisée en ce qu'elle comprend un tube métallique (1) fermé à une extrémité par un fond (2) et fermé à son autre extrémité par un couvercle amovible (4), des buses de chauffage fixées à l'intérieur du tube sur le fond (2), une pile (8) en nid d'abeille disposée à l'intérieur du tube (1) au dessus des buses de chauffage (9), une source d'énergie pour l'alimentation en comburant et carburant des buses de chauffage (9) enfermée à l'intérieur d'une coiffe aérodynamique (3) fixée à l'extérieur du tube sur le fond (2), un empennage à ailettes déployables (5) et une charge propulsive fixés tous les deux à l'extérieur du tube sur le couvercle amovible (4),un découpeur pyrotechnique (6) placé entre le couvercle (4) et le tube (1) pour éjecter le couvercle (4) à l'arrivée en fin de vol de la munition sur le sol, et un capteur piézo-électrique (7) couplé à au moins un allumeur des buses de chauffage (9), à la source d'énergie et au découpeur pyrotechnique pour commander l'éjection du couvercle (4) et l'envoie du comburant et du carburant sur les buses de chauffage (9) et déclencher une production de bruit sur la fréquence de résonance du tube (1) produit par l'échange d'énergie entre le fond (2) du tube et son extrémité (1b) au contact de l'air ambiant lorsque le couvercle est éjecté.Acoustic ammunition characterized in that it comprises a tube metallic (1) closed at one end by a bottom (2) and closed at its other end with a removable cover (4), heating nozzles attached to inside the tube on the bottom (2), a honeycomb stack (8) arranged at inside the tube (1) above the heating nozzles (9), a source energy for the fuel and fuel supply to the heater (9) enclosed within an aerodynamic cover (3) fixed to the outside of the tube on the bottom (2), a tail unit with deployable fins (5) and a propellant charge both attached to the outside of the tube on the removable cover (4), a pyrotechnic cutter (6) placed between the cover (4) and the tube (1) to eject the cover (4) upon arrival at the end of flight of the ammunition on the ground, and a piezoelectric sensor (7) coupled to the at least one igniter for the heating nozzles (9), at the energy source and at the pyrotechnic cutter to control the ejection of the cover (4) and sending oxidant and fuel to the heating nozzles (9) and trigger a noise production on the resonance frequency of the tube (1) produced by the exchange of energy between the bottom (2) of the tube and its end (1b) in contact with ambient air when the cover is ejected. Munition selon la revendication 1 caractérisée en ce que la source d'énergie comprend de l'acétylène comme carburant et l'oxygène comme comburant.Ammunition according to claim 1 characterized in that the source of energy includes acetylene as fuel and oxygen as oxidizer. Munition selon les revendications 1 et 2 caractérisée en ce qu'elle comprend comme charge propulsive de la poudre noire.Ammunition according to claims 1 and 2 characterized in that it includes black powder as a propellant. Munition selon l'une quelconque des revendications 1 à 3 caractérisée en ce que la partie chaude du tube (1) située près des buses de chauffage est isolée de l'extérieur par une couche isolante thermiquement (10).Ammunition according to any one of claims 1 to 3 characterized in that the hot part of the tube (1) located near the nozzles of heating is insulated from the outside by a thermally insulating layer (10). Munition selon l'une quelconque des revendications 1 à 4 caractérisée en ce qu'elle comprend un empennage (5) formé d'ailettes déployables fixé à l'extérieur du tube (1) sur le couvercle amovible (4).Ammunition according to any one of claims 1 to 4 characterized in that it comprises a tail (5) formed of fins deployable fixed to the outside of the tube (1) on the removable cover (4). Utilisation de la munition selon l'une quelconque des revendications 1 à 5 dans un mortier.Use of the ammunition according to any one of the claims 1 to 5 in a mortar.
    EP19990401658 1998-07-07 1999-07-02 Acoustic ammunition Expired - Lifetime EP0971200B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9808685 1998-07-07
    FR9808685A FR2781044B1 (en) 1998-07-07 1998-07-07 ACOUSTIC AMMUNITION

    Publications (2)

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

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    ID=9528358

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP19990401658 Expired - Lifetime EP0971200B1 (en) 1998-07-07 1999-07-02 Acoustic ammunition

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    EP (1) EP0971200B1 (en)
    DE (1) DE69903885T2 (en)
    FR (1) FR2781044B1 (en)

    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
    FR2781044B1 (en) 2000-10-06
    FR2781044A1 (en) 2000-01-14
    DE69903885D1 (en) 2002-12-19
    EP0971200B1 (en) 2002-11-13
    DE69903885T2 (en) 2003-09-11

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