116 results about "Explosive blast" patented technology

Blast resistant prefabricated wall panels contain at least one panel consisting of two structural boards having a thermoset resin-impregnated fiber reinforcing layer therebetween and extending from sides of the panel, the extension wrapped at least partially around metal sole and top plates of a metal sole plate, top plate, and stud construction. The panels are capable of resisting explosive blasts without forming secondary projectiles, and are preferably attached to a building structure by energy absorbing deformable brackets.

Methods and devices for a miniature, ultra-low power impact recorder for detecting, quantifying and recording the energy of an explosive blast or ballistic projectile impact. In one embodiment, the impact recorder can included a sensor comprised of an array of electromechanical resonators that is sensitive to the vibrations produced in selected, discrete frequency ranges that approximate the spectral signature characteristics of the shockwave resulting from the ballistic impact event, even after traveling through impacted material or body tissues.

A shield for shielding structures, vehicles and personnel from a projectile and / or an explosive blast generally includes a substantially planar shield plate adapted for attachment to a structure to provide protection to the structure. The shield plate includes a chassis having an interior surface facing the structure and an opposite outer surface, and a ballistic liner disposed on the outer surface of the chassis such that the chassis is more proximal the structure than the ballistic liner. The ballistic liner has an exterior surface facing the exterior environment.

Barrier elements provide security from terrorist threats by ability to withstand both vehicle collisions and explosive blasts. Each barrier element is prefabricated to include a massive block of durable material, preferably of high strength concrete, with at least one tunnel extending at least partially between respective cavities in two opposite sides of the block. Each barrier element also includes at least one beam that is preferably made of steel and extends through one such tunnel. Multiple blocks are positionable slidably on top of the ground side-against-side with their beams coupled longitudinally to one another at least approximately end-to-end. Retainer means can be used to block coupling means from entry into the tunnels. Forces from a vehicle collision or an explosive blast can cause barrier elements to rotate relative to one-another when the couplings between beams hinge or bend as the durable material that interferes with the rotation breaks away.

A pressure impulse mitigating barrier which includes a water gel sheet having an array of protrusions formed from the water gel; and / or a layer having a plurality of disruptor particles is provided. Such a structure may protect an entity from the effects of pressure impulse, e.g. from damage caused by projectiles or from explosive blast.

An opening in a building wall is closed by a building closure such as a window or door. A mounting part of the closure arrangement is received in a space between two countersupport surfaces formed by a U-channel or opposite L-members that protrude perpendicularly from the sill or jamb surface of the wall bounding the opening. Mounting brackets secure the U-channel or L-members to the wall. On one or both sides, a respective damping element is interposed between the mounting part and the respective adjacent countersupport surface. The damping element may be a plastically deformable metal strip. When an explosion force acts on the closure arrangement, the damping element is first plastically deformed to absorb energy, before the remaining force is transmitted into the building wall. The two damping elements on opposite sides damp forces from the positive and negative pressure waves of the explosion.

The present invention is directed to new and improved armor protection that can replace the existing crew cabin with a field replaceable armored crew compartment to be attached to the existing body of an HMMWV military vehicle to protect the military personnel within from explosive blasts, roll-over or collisions. In accordance with the concepts of the present invention, in order to provide additional protection to personnel in the HMMWV crew compartment, a sacrificial V-shaped hull is designed to be attached onto the underside of the crew compartment over the HMMWV frame rails. In the event of an explosion underneath the HMMWV, the V-shaped hull will shield the personnel inside the cabin and absorb the force of the explosion.

Masses of composite material are coupled together by means of one or more cables into a longitudinal barrier wall to provide security from terrorist threats by being able to withstand both vehicle collisions and explosive blasts. The one or more cables are routed through tunnels within the masses. The tunnels have tapered openings to protect cable from being sheared apart when adjacent masses slide relative to one-another. Some of the cable is anchored to some of the masses. Each mass that is located at an end of a barrier wall is used to support anchoring means to anchor some of the cable. Such barrier walls are supported by a surface such as a ground surface and can be dragged along such a surface since a ground anchoring means isn't required. Given sufficient cable, such a barrier wall can withstand great longitudinal tension, and can absorb and endure great amounts of mechanical and thermal energy.

An apparatus for inhibiting effects of an explosive blast includes a central portion including a stiffening element and defining a radiused exterior surface and a plurality of sides extending from the central portion for attachment to a structure. The central portion and the plurality of sides are configured to redirect at least a portion of a blast wave resulting from an explosive blast. A vehicle hull includes a personnel compartment and an apparatus for inhibiting effects of an explosive blast operably associated with the personnel compartment. The apparatus includes a central portion including a stiffening element and defining a radiused exterior surface and a plurality of sides extending between the central portion and the personnel compartment. The central portion and the plurality of sides are configured to redirect at least a portion of a blast wave resulting from an explosive blast.

An explosive blast overpressure space-time field reconstruction method adopts an overpressure sensor array in a blast test system to acquire blast signals, and utilizes a blast overpressure space-time field reconstruction module to reconstruct an explosive blast overpressure space-time field; during reconstruction, a tested area is first meshed, sensor array elements are arranged, an explosion point is then located, a blast velocity field and a blast peak overpressure field are reconstructed, and thereby therefore a blast peak overpressure field reconstruction result is obtained; in combination with the blast peak overpressure field reconstruction result of the point, each parameter of a 'modified Friedlander equation' is solved, so that blast overpressure space-time data are obtained; finally, the reconstructed data are converted into an image file, and thereby therefore the blast overpressure space-time field is visualized. The method provides a basis for the evaluation of the damage effectiveness of blast and the structure and performance of explosive; and meanwhile, the method also is an important means for evaluating the safety of personnel, the shock resistance of equipment and the affection of blast on the surrounding environment.

The invention in various embodiments is directed to systems and methods for mitigating damage from a shock wave using a gas having a specific impedance less than air.

Disclosed is a system and method to both reduce a degree of explosive shock waves and to absorb a degree of explosive blast energy from the undercarriage of a vehicle which comprises the use of one or more layers of rigid closed-cell spray polyurethane foam, applied to the armored undercarriage of the vehicle. This invention combines two key aspects: 1) blast suppression or mitigation materials that absorb energy and 2) traditional military hardened armor solutions. The effectiveness of spray applied rigid foam has been proven to both dramatically reduce shock waves and absorb energy from explosive blasts (e.g., IEDs).

The present invention is directed to new and improved armor protection that can replace the existing crew cabin with a field replaceable armored crew compartment to be attached to the existing body of an HMMWV military vehicle to protect the military personnel within from explosive blasts, roll-over or collisions. In accordance with the concepts of the present invention, in order to provide additional protection to personnel in the HMMWV crew compartment, a sacrificial V shaped hull is designed to be attached onto the underside of the crew compartment over the HMMWV frame rails. In the event of an explosion underneath the HMMWV, the V shaped hull will shield the personnel inside the cabin.

A composite shield comprises a panel including an outer thin metallic strike surface layer, a highly strain rate hardening polymer layer and an inner structural armor plate layer. The structural armor plate layer has a multiplicity of traversing ports. The traversing ports have sufficient lateral area to allow deformation of the thin metallic strike surface layer and highly strain rate hardening polymer layer through the structural armor plate layer on the occurrence of explosive blast.

Methods and devices for a miniature, ultra-low power impact recorder for detecting, quantifying and recording the energy of an explosive blast or ballistic projectile impact. In one embodiment, the impact recorder can included a sensor comprised of an array of electromechanical resonators that is sensitive to the vibrations produced in selected, discrete frequency ranges that approximate the spectral signature characteristics of the shockwave resulting from the ballistic impact event, even after traveling through impacted material or body tissues.

A wall system protects a building structure from pressure caused by explosive blasts. The wall system includes vertical studs. Outer blast wall panels and inner blast wall panels are secured to the opposing sides of the vertical studs. An upper mounting system is attached to the building structure. An upper mounting system includes a fixed track, a movable mounting track, and an energy absorbing system that flexibly couples the movable mounting track to the fixed track. The upper ends of the vertical studs are attached to movable mounting track. A lower mounting system includes a mounting track that aligns the lower ends of the vertical studs. The wall are filled with an energy absorbing material. The lower ends of the vertical studs are connected to a lower track.

The invention discloses a downhole string dynamic response test system and test method under explosive blast, relates to an ultra-deep oil-gas well string dynamic response test system and test method, and belongs to the technical field of well logging in the process of development of oil and gas fields. The test system comprises an acceleration test mechanical system and an electronic circuit and support software subsystem. The acceleration test mechanical system comprises an acceleration sensor and a test system shell. The test system shell is mainly composed of an accelerometer head, a buffer connecting member, a thermal insulation sleeve connecting member, a thermal insulation sleeve, a circuit board support, an external sleeve and a rear cover component. The acceleration sensor is isolated from the external high temperature condition by protection of the thermal insulation sleeve and can normally work in extreme circumstances. The invention also discloses the test method realized based on the test system. Axial, radial and circumferential acceleration of a perforating gun in the extreme circumstances can be measured, and the law of shock wave loading and the law of string dynamic response can be researched by analyzing and processing the measured acceleration information.

A shield for shielding a structural member from an explosive blast or accidental or malicious destruction is provided. The shield includes a plurality of shield members which include cast ultra high strength concrete, wherein the shield members are capable of being assembled to enclose at least a portion of the structural member to provide protection to the enclosed portion from, for example, an explosive blast. In one embodiment, the shield members include a chassis, at least one ballistic liner disposed on the energy absorbing layer, and a concrete-integrating structure.

The invention provides an array of blast-resistant partitions arranged to subdivide a predetermined space into a multiplicity of interconnected subspaces and thereby to substantially confine an explosive blast to one or more of the subspaces while protecting the remaining subspaces in the predetermined space.

A blast-resistant cargo container includes side panels and connecting members. The connecting members are mounted between the adjacent side panels to create a frameless structure of the cargo container. Under ordinary conditions, the structure still has sufficient stiffness for loading goods. When an explosive blast occurs in the cargo container, the structure is flexible and utilizes membrane strength in the entire container structure, whereby the cargo container is capable of withstanding the explosive blast. Bottom perimeter bars are able to be mounted around a bottom surface of the cargo container. Grooves are defined in the perimeter bars and L-shaped flanges are formed on one end of the connecting members. Therefore, by receiving the L-shaped flanges into the grooves, the perimeter bars are securely connected with the side panels.

The invention discloses high-wave impedance concrete as well as a preparation method and application thereof. The high-wave impedance concrete is prepared from the following components including cement, water, iron sands and an effective water reducing agent, wherein the water cement ratio is 0.24-0.28, the mass ratio of the cement to the iron sands is 1:(1.6-3.0), and the quality of the effective water reducing agent accounting for 1.0-2.0 percent of the quality of the cement. According to the preparation method disclosed by the invention, the cement, the water, the iron sands and the effective water reducing agent are mixed to carry out gelatinization to form the high-wave impedance concrete, and slurry formed by the cement and the water wraps the iron sands by virtue of mixing, and hardening is carried out to form calculus; water dosage is reduced by virtue of the effective water reducing agent, and the calculus density is improved; meanwhile, as the density of the concrete and longitudinal wave propagation speed of the concrete are increased by utilizing the iron sands, the high-wave impedance concrete is obtained, and the reflectivity of explosive blast can be improved.

The invention discloses a device for repairing deformed sleeves by explosion. Explosive is put at a fracture of a sleeve or a deformed section of a well, an explosive blast wave is formed on the inner surface of the sleeve quickly after the explosive is blasted, and high-pressure blast waves generated by blasting of the explosive enable the sleeve to expand outward in a shorter time so as to repair the deformed sleeve and open the channel, thus the problem that deformations of the sleeve such as hole shrinkage, bending, fracture and the like affect the oil well productivity is solved.