The present disclosure relates to methods and systems for controlling the shape and direction of an explosion, and more particularly, methods and systems for controlling the shape and direction of an explosion in order to refract and diminish an approaching shock wave.
A common feature of explosive ordnance is that it includes an explosive charge encased within a warhead. The warhead may be self-propelled, as the payload of a missile or rocket-propelled grenade (RPG), or it may be ballistic, as the payload of a mortar round, shell or air-to-ground bomb. Such explosive ordnance creates destruction and injury in two principal ways.
First, when detonated, the explosive charge creates a heated volume of gas and plasma that expands rapidly and disintegrates the warhead in which it is contained. Pieces of the disintegrated warhead create high-velocity shrapnel that may impact and damage surrounding structures, including vehicles, and personnel. Stationary structures may be hardened to protect against the damage caused by shrapnel. Protective armor may be applied to vehicles to lessen the damage caused by shrapnel, but such armor adds to the weight of the vehicle, which may negatively affect its performance. Body armor may be worn by individuals, but is less effective because such armor typically leaves portions of the individual, such as the head, arms and legs, unprotected.
Second, detonation of the explosive charge creates an expanding volume of hot gases and heated plasma caused by rapid combustion of the explosive charge. The outer boundary of the expanding volume of hot gases and plasma forms a pressure shock wave. Depending upon the energy released by the detonation of the explosive charge of the warhead, this shock wave may contain sufficient energy to severely damage adjacent structures, including vehicles, and cause injury or death to personnel it impacts. Stationary structures may be hardened to withstand the energy imparted by such shock waves. Adding armor to vehicles is less effective, especially with respect to lighter vehicles, which cannot carry heavy armor. Personnel may be particularly vulnerable to high-energy shock waves caused by exploding ordnance. For example, a shock wave from an explosion may at a minimum damage a person's ear drums, and at higher energy levels, can cause a concussion resulting from a person's brain impacting his skull, or death.
Accordingly, there is a need to develop a countermeasure that can lessen the destructive effect of shock waves caused by exploding ordnance. Such countermeasures preferably should be capable of deployment on the order of milliseconds once explosive ordnance has detonated.
In one embodiment, a method of controlling the shape and direction of an explosion may include embedding a plurality of detonators in an explosive, and arranging the detonators in the explosive to produce a shaped explosion of the explosive in a pre-set direction and having a pre-set intensity when triggered in a selected sequence; sensing a direction of an incoming threat relative to a protected region, calculating an intercept vector for the incoming threat, and sending a signal in response thereto by a sensor; receiving information from the sensor pertaining to the intercept vector and determining a sequential firing pattern for the detonators in response to the information from the sensor by a firing sequence calculator connected to trigger the detonators; and activating the firing sequence calculator to trigger the detonators in the sequential firing pattern to generate a counteracting force substantially along the intercept vector.
In another embodiment, a method for deflecting or destroying an incoming threat to a vehicle may include embedding a plurality of detonators in an explosive, and arranging the detonators in the explosive to produce a shaped explosion of the explosive in a pre-set direction and having a pre-set intensity when triggered in a selected sequence; sensing a direction of an incoming threat relative to the vehicle, calculating an intercept vector for the incoming threat, and sending a signal in response thereto by a sensor; receiving information from the sensor pertaining to the intercept vector and determining a sequential firing pattern for the detonators in response to the information from the sensor by a firing sequence calculator connected to trigger the detonators; and activating the firing sequence calculator to trigger the detonators in the sequential firing pattern to detonate the explosive to generate a counteracting force substantially along the intercept vector.
In yet another embodiment, a method for providing an offensive weapon against an incoming threat may include embedding a plurality of detonators in an explosive, and arranging the detonators in the explosive to produce a shaped explosion of the explosive in a pre-set direction and having a pre-set intensity when triggered in a selected sequence; detecting an incoming threat relative to a protected area, and sending a signal containing distance, elevation and azimuthal information by a sensor; and triggering the detonators in a pre-set sequence determined by the signal received by a firing sequence calculator to shape and direct an explosion from the explosive toward the incoming threat to neutralize, destroy, or deter the threat.
Other objects and advantages of the disclosed method and system will be apparent from the following description, the accompanying drawings and the appended claims.
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The protected region 26 may be located behind the explosive device 16 and may include a vehicle 36 (see
The detonators 20 may be arranged in the explosive 18 in a regular grid pattern; that is, the detonators may be arranged in substantially evenly spaced and aligned rows and columns in the explosive so that they may be dispersed substantially evenly throughout the explosive. Although the detonators 20 are shown arranged in substantially a single plane in the explosive 18, it is to be understood that the detonators may be arranged in a three-dimensional pattern in the explosive such that the detonators may form a three-dimensional prism shape within the explosive, and not depart from the scope of the disclosed system 10. It is also to be understood that the arrangement of detonators 20 may take a different pattern in the explosive 18, depending upon the desired shape of the shock wave to be created by detonating the explosive. In this manner, detonators 20 may be arranged in one of a one-dimensional, two-dimensional, or three-dimensional pattern.
The sensor 12 may be selected to detect the explosion 32 from the incoming threat 34, which may include a mortar round, artillery shell, guided missile, RPG or air-to-ground bomb, as well as detonation of a stationary explosive device such as an improved explosive device (IED) or a land mine. In each case, the sensor 12 preferably is selected to detect detonation of the incoming threat 34 before the resultant shock wave 30 reaches the protected region 26. In one aspect, the sensor may be selected to detect electromagnetic radiation 38 emitted by the explosion 32 because it travels much faster than the shock wave 30.
The sensor 12 may be selected to detect any subset of the electromagnetic spectrum emitted by the explosion 32, such as microwave bursts; flashes of infrared, visible and ultraviolet light; and x-ray bursts. For example, it has been found that IEDs may emit x-rays during detonation. Such an x-ray signature may be detected by the sensor 12 in advance of the shock wave 30 so that the system 10 would have time to deploy. In one aspect, a sensor 12 may be selected to detect two or more different types of electromagnetic radiation 38 to minimize deployment of the system 10 in response to false positives. In this manner, system 10 may include at least two different types of sensors. In another aspect, the system 10 may include a sensor 12 selected to detect bursts of electromagnetic radiation 38 in the form of gamma rays or neutrons, in addition to or instead of x-rays or microwaves, such that the system may deploy in response to an incoming shock wave from a nuclear detonation.
In one aspect, the sensor 12 not only may detect the explosion 32, but also estimate one or more of the magnitude, distance, elevation angle and azimuthal position. These estimates may prevent the sensor 12 from signaling the firing sequence calculator 14 to detonate the explosive 18 when the explosion is too small or distant to be a threat to the protected region 26. When the location of the explosion 32 is determined to be sufficiently close to present a threat to the protected region 26, the sensor 12 may send a signal over cable 40 to the firing sequence calculator 14, which may send instructions over cable 42 to the detonators 20 of the explosive device 16.
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In one aspect, the grid pattern 44 may be in the shape of a rectangular prism. However, it is within the scope of the disclosure to provide grid patterns 44 in different shapes, for example as a radial grid. In one aspect, the grid pattern 44 is two dimensional. However, it is within the scope of the disclosure to provide detonators 20 in a three-dimensional pattern. In such an embodiment, as shown in
The firing sequence calculator 14 (
In one aspect, the system may operate as follows, as illustrated in
The sensor 12 transmits information over cable 40 to the firing sequence calculator 14, which uses location information to create an appropriate firing sequence for the detonators 20 in the grid 44 (see
In one aspect, the explosive 18 may be shaped to fit a surface on which it is mounted, rather than be shaped to effect a desired explosion 24 and directed volume of hot gas 28. For example, in
In the embodiment of
In one aspect, the sensor 12 of the system 10 may be selected to detect an incoming threat 34 in the form of an RPG, then signal the firing sequence calculator 14 that in turn triggers detonators 20 embedded in explosive 18. The direction of the incoming threat 34 would be fed to the firing sequence calculator 14 that would trigger detonators 20 in a pattern that would create a shaped explosion 24 that would deflect or destroy the threat.
In one aspect, the system 10 may be used as an offensive weapon against an incoming threat. In one exemplary embodiment, the sensor 12 may detect an incoming threat in the form of, for example, hostile personnel or vehicle. The sensed signature may include, for example infrared radiation from body heat of the hostile personnel or hostile vehicle, movement of hostile personnel or vehicle, or the flash of electromagnetic radiation from a weapon held by hostile personnel, such as a rifle or machine gun, or mounted on the hostile vehicle. The sensor 12 may detect the location of the hostile personnel relative to the protected area 26 or vehicle 36 and send a signal containing distance, elevation and azimuthal information to firing sequence calculator 14. Firing sequence calculator 14 may then trigger detonators 20 in a pre-set sequence determined by information received from sensor 12. The resultant explosion 24 may be shaped and directed by firing sequence calculator 14 toward the incoming threat to neutralize, destroy or deter the threat.
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In one aspect, as shown in
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These particular embodiments are shown to illustrate the general principle of embedding detonators 20 in a pattern within an explosive 18 having a particular shape, then initiating the detonators in a sequence to produce an explosion of a desired, pre-set shape that may be directed toward an incoming hostile threat 34. Other explosive shapes and detonator patterns are included within the scope of this disclosure. In one particular aspect, the described method and system may be used to counteract the force of a shock wave 30 created by detonation of an explosive associated with an incoming threat 32. By shaping and directing a counteractive explosion 24 toward the explosion 32 resulting from an incoming threat 34, the described method and system may create an expanding volume of heated gas 28 that may be directed toward the shock wave from the incoming threat.
The volume of heated gas 28 created by the explosion 24 of the disclosed method and system may change the acoustic refractive index at the boundary between ambient air and the outer boundary of the shock wave from the counteractive explosion, thus deflecting the shock wave 30 from the incoming threat 34 away from the intended target. The volume of heated gas 28 may act as a lens to “steer” the shock wave 30 and hot gases from the incoming threat 34 away from the intended target. The shock wave 30 from the incoming threat 34 also may be dispersed and diminished in intensity from the maximum force that otherwise would impact the intended target.
According to one embodiment, a method may include sensing the direction and velocity of an incoming threat 34, calculating an intercept vector for the threat, and activating an explosive detonation grid 44 within an explosive charge 18 to detonate the charge in a manner that generates an explosion 24 having an intercepting force directed along the intercept vector. In one aspect, activating the explosive detonation grid 44 may include activating a plurality of discrete detonators 20 in a pre-set sequence in order to create an intercepting explosive force of a desired shape.
According to another embodiment, a system 10 for controlling the shape and direction of an explosion 24 may include a sensor 12 configured to detect the direction and velocity of an incoming threat 34, an explosive device 16 including a detonator grid 44, the detonator grid being configured to selectively detonate the explosive device to produce a shaped explosion 24 in a selected direction and having a selected intensity, and a firing sequence calculator 14 configured to activate the detonator grid to produce the shaped explosion and create a counteracting force in response to the incoming threat. In one aspect, the explosive device 16 may include a reinforcement or hardened substrate 22, such as a steel plate, to which explosive material 18 is attached. The explosive device 16 may be oriented such that the substrate 22 is between the explosive material 18 and the item to be protected 26 to ensure that when the explosive is detonated by the detonator grid, the explosive force is directed away from the item to be protected and toward the incoming threat 34.
According to yet another embodiment, a vehicle 36 may include a system 10 for controlling the shape and direction of an explosion 24 having a sensor 12 configured to detect the direction and velocity of an incoming threat 34, an explosive device 16 including a detonator grid 44, the detonator grid being configured to selectively detonate the explosive device to produce a shaped explosion 24 in a selected direction and having a selected intensity, and a firing sequence calculator 14 configured to activate the detonator grid to produce the shaped explosion and create a counteracting force in response to the incoming threat. In one aspect, at least the explosive device may be mounted on a door 48 of the vehicle 36 and may include a reinforcement or hardened substrate 22, such as a steel plate, to which explosive material 18 is attached. The explosive device 16 may be oriented such that the substrate 22 is between the explosive material 18 and the vehicle 36 to ensure that when the explosive material is detonated by the detonator grid, the explosive force is directed away from the vehicle 36 and toward the incoming threat 34. In one aspect, the sensor 12 also may be mounted on the vehicle door 48. The vehicle 36 may include a cover to protect the explosive device 16.
In one aspect, the sensor 12 is selected to detect an explosion 32 caused by an incoming threat 34 before the resultant shock wave 30 reaches the item 26 the system 10 is to protect. The sensor 12 may be selected to detect electromagnetic radiation 38 created by detonation of an explosive associated with the incoming threat, because such radiation travels at light speed and will reach the sensor before the shock wave. The electromagnetic radiation 38 may include microwave bursts, and flashes of radiation in one or more of the x-ray, infrared, visible light and ultraviolet portions of the electromagnetic spectrum.
In one aspect, the detonator grid 44 may include a plurality of discrete detonators 20 arranged in a pattern embedded in the explosive material 18, and in a further aspect, the pattern may be in the shape of a regular grid. The firing sequence calculator 14 may be activated to trigger the detonators 20 in the sequential firing pattern by determining the optimum sequential firing pattern for the detonators, and triggering the detonators in the regular grid pattern in the optimal sequential firing pattern. In other aspects, the detonators 20 may be arranged in rings, concentric circles or a radial pattern. The explosive material 18 may be formed in the shape of a plate, a cylinder, a sphere, a cone, a truncated pyramid or other regular geometric shape. The selected shape of the explosive material 18 may be determined by the surface or structure on which it is to be mounted, and by the desired shaped explosion. The pattern of detonators 20 in the explosive material 18 may be selected depending on the shape of the explosive material and by the desired shaped explosion.
In one aspect, each detonator 20 may be individually connected to the firing sequence calculator 14 so that the firing sequence calculator may create a desired sequence of detonator activation. In another aspect, groups of detonators 20 may be connected to the firing sequence calculator 14 so that the groups of detonators may be triggered sequentially to create a desired shaped explosion.
The system 10 described herein may be used both offensively and defensively in response to a threat to create an explosion having a pre-set shape by selectively triggering a plurality of detonators embedded in an explosive and project a volume of hot gas toward the threat. While the methods and forms of apparatus described herein may constitute preferred aspects of the disclosed method and apparatus, it is to be understood that the invention is not limited to these precise aspects, and that changes may be made therein without departing from the scope of the invention.
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Number | Date | Country | |
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Parent | 13423712 | Mar 2012 | US |
Child | 14519890 | US |