BLAST DEFLECTOR
A blast energy deflector to reduce load and energy transmitted to a vehicle from buried mines or improvised explosive device (IED) threats. The deflector may add stiffness to the hull thereby protecting or delaying deformation or damage to the vehicle underside. The deflector may be hollow, filled with plastic or other composites to dissipate blast energy, or solid, and may be detachably affixed to the vehicle underside.
This disclosure was made in part with Government support by The United States Department of the Army. The Government has certain rights in the disclosure.
TECHNICAL FIELDThis disclosure relates to an energy deflector to reduce load and energy transmitted to any vehicle structure such as a body on frame or a monocoque vehicle structure, or any other vehicle structure, from buried mines or improvised explosive device (IED) threats. The deflector may add stiffness to the hull thereby protecting or delaying deformation or damage to the vehicle underside. The deflector may be hollow, filled with plastic or other composites to dissipate blast energy, or solid, and may be detachably affixed to the vehicle underside.
BACKGROUNDExisting combat vehicles are extensively used in conflict theaters where asymmetric warfare occurs. In such a conflict, it is very effective to use simple weapons to destroy very expensive vehicles and other equipment. IEDs and buried mines are especially favored by such asymmetric forces. They are cheap to make, easy to conceal and deliver a large amount of energy into a small area of a very expensive piece of equipment. The hulls of any vehicle subjected to an IED or buried mine are damaged and the personnel are injured, or worse. Part of the issue is that the blast from such a device is concentrated upwardly against a small part of a vehicle, thereby concentrating the destructive effect of the impact. Some vehicles have used reinforced hull designs or have adopted vehicle hull designs calculated to deflect or spread the blast force over a large area. However, there are many lighter armored vehicles where such design parameters are not used, or where a pre-existing vehicle does not incorporate such a design In addition, vehicles previously designed to withstand blast events from previous IEDs and buried mines now face much more powerful IEDs and buried mines, thereby reducing the protective value of previous designs. Moreover, vehicles with segmented armor plating may be especially susceptible to concentrated blast force.
Improvements in blast energy deflection are continuing and needed. In one embodiment, the blast deflector may be a piece of angled welded plate metal attached to the underside of a vehicle. In other vehicles with segmented armor, the deflectors may be attached to a channel with fasteners along the length of the vehicle to impart protection over the entire underside of the vehicle. Attachment of the device to the vehicle is not necessarily rigid. The blast deflector includes mounting the deflector on an energy absorber or spacer to decouple it from the main vehicle hull structure. The device can remain effective at reducing transferred energy from a blast event to the hull even if it eventually or quickly is separated from the structure and the device works by directing energy away from the vehicle early in the blast event. The structure and/or stiffness provided by the device can assist in protecting the structure above it and dispersing the blast energy over a greater area, thereby dissipating it. The device may be flexibly mounted to allow for closer placement to the ground without negatively affecting vehicle mobility.
All figures and examples herein are intended to be non-limiting; they are mere exemplary iterations and/or embodiments of the claims appended to the end of this description. Modifications to system, device, the order of steps in processes, etc., are contemplated.
Referring to
The blast deflector legs may also be oriented relative to each other by an angle θ chosen to compliment the vehicle hull design so that the blast deflector may accommodate a given hull shape and, when affixed thereto, impart blast deflection along the length of the deflector. The deflector is shown as being hollow, but it could also be filled with plastic, glass, composites, metals or other energy absorbing blast deflecting material. It also contemplated to be configured to have internal divisions to create individual spaces to dissipate the blast, or even be solid.
The sides of the deflector may intersect at vertex 24 which is shown as a sharp point, but which may, in other embodiments, be rounded. The sides of the deflector may straight, or they may be arcuate, with either a concave or convex orientation, as seen in
As depicted in
As previously mentioned, the apertures in the vehicle hull may be threaded. A shearable bolt, rivet, or other fastener may be passed through the aligned aperture 30 in the blast deflector and aperture 42 in the vehicle hull, to detachably affix the blast deflector onto the vehicle structure. As previously stated, the apertures may be equipped with mounting apparatus to detachably affix the fastener into the vehicle hull. The fasteners may be of a material designed to shear off in response to blast force, thereby permitting the blast deflector to be detached during the blast event but after it has dissipated the blast force. In some embodiments, the connection may before from friction stir welding. In some embodiments, mechanical connections are made through plates, bolts such as shear bolts, insert plates and other connecting structures. In one embodiment, insert plates are attached to the lower hull. Different bolt thicknesses and a different number of bolts in the connection can lead to different separation characteristics in a blast event, as well as different patterns of energy absorption and dissipation through bolt shearing. The bolts may have varying diameters, and may be “tuned” to shear at various forces. Bolts shearing in a controlled manner may dissipate blast energy and protect occupants in the vehicle during a blast event.
As seen in
The simulated data seen in
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- a. Z Acceleration is expected to be reduced
- b. Center blast—shows a significant reduction; in a center blast, the blast forces are symmetrical and the deflector may remain attached to the vehicle
- c. Offset blast—shows a significant reduction
Although the steps of the above-described simulated data have been exemplified as occurring in a certain sequence, such processes could be practiced with the steps performed in a different order. It should also be understood that certain steps could be performed simultaneously, that other steps could be added, or that certain steps could be omitted. In other words, the descriptions of the simulated data are provided for the purpose of illustration, and should not limit the claimed invention.
Accordingly, it is to be understood that the above description is intended to be illustrative and not restrictive. Many embodiments and applications other than the examples provided would be apparent upon reading the disclosure. For example, embodiments of the blast deflector may be made to separate from the hull structure, or remain on the hull structure. Also, the blast deflector attachment method can be varied, so as to time the separation of the blast deflector to the hull structure earlier or later in the blast event, to achieve different energy absorbing and/or acceleration and/or velocity characteristics with different shapes, thicknesses, and material choices.
The scope of the invention should be determined with reference to the appended claims along with the full scope of equivalents. It is intended that future developments will occur, and that embodiments of the disclosed systems and methods will incorporate and be incorporated with such future developments.
Use of singular articles such as “a,” “the,” “said” together with an element means one or more of the element unless a claim expressly recites to the contrary.
Claims
1. A blast energy deflector, comprising:
- a generally triangular body having a base affixed to an existing vehicle structure; the deflector having two sides that intersect at an apex; the deflector being formed with the base and the two sides as a closed form and being hollow along a length of the vehicle structure;
- each the side extending beyond the base to form legs; the blast deflector configured to be detachably secured to the vehicle structure;
- the legs oriented at an angle to accommodate the vehicle structure so that the deflector may accommodate the vehicle structure shape and, when affixed thereto, impart blast deflection along the length of the vehicle structure; and
- wherein the legs each have a plurality of apertures, wherein each aperture has a counter sink.
2. (canceled)
3. The blast energy deflector of claim 1, wherein the triangular body is filled with plastic, glass, composites, metals or other blast deflecting material.
4. The blast energy deflector of claim 1, wherein the triangular body is configured to have internal divisions to create individual spaces to dissipate the blast.
5. The blast energy deflector of claim 3, wherein the deflector is formed as a solid due to the filled-up material.
6. The blast energy deflector of claim 1, wherein the apex is rounded.
7. The blast energy deflector of claim 1, wherein the sides are straight.
8. The blast energy deflector of claim 1, wherein the sides are arcuate.
9. The blast energy deflector of claim 1, wherein the blast deflector is configured to be detachably affixed to the vehicle structure.
10. The blast energy deflector of claim 1, wherein at least a portion of the deflector has a triangular form.
11. A vehicle with a blast energy deflector system for a vehicle structure, comprising:
- at least one blast deflector having a generally triangular body with a base affixed to the existing vehicle structure;
- the deflector having two sides that intersect at an apex; each the side extending beyond the base to form legs;
- the legs oriented at an angle to accommodate the vehicle structure so that the deflector may accommodate the vehicle structure shape and, when affixed thereto, impart blast deflection along a length of the vehicle; and
- wherein the legs each have a plurality of apertures, wherein each aperture has a counter sink,
- wherein the deflector is formed with the base and the two sides as a closed form and is hollow along the length of the vehicle.
12. The vehicle with a blast energy deflector system of claim 11, wherein the blast deflector is detachably affixed to the vehicle.
13. (canceled)
14. The vehicle with a blast energy deflector system of claim 11, wherein the triangular body is filled with plastic, glass, composites, metals or other blast deflecting material.
15. The vehicle with a blast energy deflector system of claim 11, wherein the triangular body is configured to have internal divisions to create individual spaces to dissipate the blast energy.
16. The vehicle with a blast energy deflector system of claim 14, wherein the blast deflector is formed as solid due to the filled-up material.
17. The vehicle with a blast energy deflector system of claim 11, wherein the blast deflector apex is rounded.
18. The vehicle with a blast energy deflector system of claim 11, wherein the blast deflector sides are straight.
19. The vehicle with a blast energy deflector system of claim 11, wherein the blast deflector sides are arcuate.
20. The vehicle with a blast energy deflector system of claim 11, wherein a plurality of blast deflectors are affixed to the vehicle structure.
21. The blast energy deflector of claim 1, further comprising;
- a lower aperture formed at vertex having a counterbore; and
- a sensor accommodated within the counterbore of the lower aperture, the sensor configured to transmit data regarding at least one of blast force, blast acceleration, and blast velocity.
22. The vehicle with a blast energy deflector system of claim 11, further comprising:
- a lower aperture formed at vertex having a counterbore; and
- a sensor accommodated within the counterbore of the lower aperture, the sensor configured to transmit data regarding at least one of blast force, blast acceleration, and blast velocity.
Type: Application
Filed: Apr 9, 2018
Publication Date: Oct 10, 2019
Inventors: Celyn M. Evans (Berkley, MI), Reed Pelly (New Hudson, MI), Jason Kremar (Mooresville, NC), Aaron Ward (Charlotte, NC)
Application Number: 15/948,349