There are described methods and system for determining a similarity or distance measure between a first ballistic specimen and a second ballistic specimen. The method comprises acquiring topographic data from the first ballistic specimen and the second ballistic specimen of at least one region of interest; computing from the topographic data at least one similarity score s for the first ballistic specimen and the second ballistic specimen; determining a non-match probability measure of the similarity score for at least one parameter characterizing a macroscopic and/or microscopic feature of the topographic data, the non-match probability measure associating the first ballistic specimen and the second ballistic specimen to a different source; and correcting the similarity score by determining a corrected similarity score that yields a same value of the non-match probability measure as the similarity score for a reference value of the at least one parameter.

There are described methods and system for determining a similarity or distance measure between a first ballistic specimen and a second ballistic specimen. The method comprises acquiring topographic data from the first ballistic specimen and the second ballistic specimen of at least one region of interest; computing from the topographic data at least one similarity score s for the first ballistic specimen and the second ballistic specimen; determining a non-match probability measure of the similarity score for at least one parameter characterizing a macroscopic and/or microscopic feature of the topographic data, the non-match probability measure associating the first ballistic specimen and the second ballistic specimen to a different source; and correcting the similarity score by determining a corrected similarity score that yields a same value of the non-match probability measure as the similarity score for a reference value of the at least one parameter.

A method includes determining a perforation tunnel geometry of a perforation tunnel in a solid sample, the perforation tunnel created by activating a shaped charge in proximity to the solid sample. The method also includes performing a first flow test on the solid sample and creating an analog aperture having an aperture geometry in a solid sample analog of the solid sample, wherein the aperture geometry and the perforation tunnel geometry satisfies a similarity threshold. The method also includes performing a second flow test on the solid sample analog and determining a shaped charge effect based on a comparison between a second flow test result and a first flow test result.

A method includes determining a perforation tunnel geometry of a perforation tunnel in a solid sample, the perforation tunnel created by activating a shaped charge in proximity to the solid sample. The method also includes performing a first flow test on the solid sample and creating an analog aperture having an aperture geometry in a solid sample analog of the solid sample, wherein the aperture geometry and the perforation tunnel geometry satisfies a similarity threshold. The method also includes performing a second flow test on the solid sample analog and determining a shaped charge effect based on a comparison between a second flow test result and a first flow test result.

A portable power distribution unit for safely distributing high wattage power supplied from mobile generators to lower power test adapter units and systems. Embodiments disclosed include a structurally rigid housing shaped to facilitate secure holding by an operator's foot, a 400 Hz power connector adapted for connection to a mobile power generator, a circuit breaker matched to the rating of the system to be powered and connections for conversion of the six-pin output from the mobile generator to a three or four-pin input for the system to be powered.

A non-destructive device that measures the accuracy potential and relative ballistic coefficient of projectiles, by placing the object tested within a swirling vortex having both a rotational and vertical vector, hovering the projectile essentially above the device, and essentially unencumbered by any stator. A perfectly balanced object hovers and turns at a high rate about its long/vertical axis without contact with the device.

An electronic initiation system for use with a firing panel may include an input connector, a plurality of electronic ignition circuits (EICs) operably coupled together in series, and an indicator operably coupled to an output of each EIC of the plurality of EICs. A first EIC of the plurality of EICs may be operably coupled to the input connector. The indicator is configured to generate an indication in response to an output of an EIC of the plurality of EICs satisfying a predetermined condition.

An Instrumented Spherical Blast Impulse Recording Device (ISBIRD) provides for survivable test measurement of an explosive blast impulse. The ISBIRD includes a spherical housing formed of a metal having a thickness sufficient to survive the explosive blast wave from a test weapon. A test data module of the ISBIRD includes: (i) a three-axis acceleration sensor; (ii) a memory; and (iii) a controller communicatively coupled to the three-axis acceleration sensor and the memory. The controller executes a data acquisition utility to record acceleration data in three-dimensions from the three-axis acceleration sensor during exposure of the spherical housing to the explosive blast wave. An internal support structure of the ISBIRD is attached inside of the spherical housing and attached to the test data module. The internal support structure centrally locates the test data module within the spherical housing during exposure to the explosive blast wave.

A linear and rotary shock-testing machine including: a base; a shaft rotatably and translationally movable relative to the base; a test disc for holding one or more specimens to be tested, the test disc being rotatable with the shaft; one of a cam and cam follower fixed relative to the base; and an other of the cam and cam follower fixed to the test disc, wherein the shaft being driven to provide a rotational shock to the one or more test specimens; and the cam is shaped such that the cam follower follows the cam to urge the test disc into a translational motion while rotating to provide translational shock to the one or more specimens.

A linear and rotary shock-testing machine including: a base; a shaft rotatably and translationally movable relative to the base; a test disc for holding one or more specimens to be tested, the test disc being rotatable with the shaft; one of a cam and cam follower fixed relative to the base; and an other of the cam and cam follower fixed to the test disc, wherein the shaft being driven to provide a rotational shock to the one or more test specimens; and the cam is shaped such that the cam follower follows the cam to urge the test disc into a translational motion while rotating to provide translational shock to the one or more specimens.