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Showing 1 to 20 of 37 for “"Ballistics"”.
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Computational interior ballistics modeling
Interior ballistics are the events in a gun system that determines the performance of any gun design. In order to efficiently design any gun system the internal ballistics should be understood to minimize energy losses and correctly define design parameters. The goal of this computational model is …
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Unsteady Internal Ballistics of a Hybrid Rocket
<p>With the recent progress made in the field of space tourism, hybrid rocket engines have gained a renewed interest due to their simplicity, low cost, operational flexibility, and safety. The flow in the ports of a hybrid rocket motor involves several coupled unsteady phenomena like moving walls, …
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On a Moving Boundary Problem of Transitional Ballistics
<p>A major problem which arises in computer simulation of the firing of a gun weapon is the development of numerical schemes which effectively account for the physics of projectile motion. The chief difficulty is that away from the projectile the calculation is ordinarily accomplished on a fixed …
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An examination of voice in contemporary Canadian fiction and Ballistics : a novel
… In these essays – augmented by my novel, Ballistics, which has more than once been described as having a “very distinct voice” – I examine what, exactly, we mean (or think we mean) by the term “voice” when we use it in our discourse about fiction: it turns out that what we know intuitively …
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Computational and laboratory investigations of a model of blood droplet flight for forensic applications
… is constructed. The experiments consist of a ballistics gel containing transfer blood or porcine blood shot by a riot ball from a paintball gun constituting a simulated bloodletting event. The experiments are captured using highspeed stereo camera pair from which three-dimensional trajectories …
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Discovering Fingerprints for Deepfake Detection and Multimedia-Enhanced Forensic Investigations
… model of gun that have fired (Forensic Firearms Ballistics Comparison). Forensic Analysis of Handwritten Documents is another field of Forensic Science that can determine the authors of a manuscript by extracting a fingerprint defined by a careful analysis of the text style in the document. …
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An investigation of didactic energy transfer systems
… about electromagnetism, classical mechanics and ballistics, and an end to end power plant energy conversion laboratory to introduce the topics of heat transfer and process efficiencies.
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Computational Design of Viscoelastic Gels with Tunable Mechanical Energy Dissipation
… tissues can enable testing the effect of ballistics and designing of protective equipment. The physical instability of existing tissue simulants over long times and ambient temperatures has propelled interest in using polymer gel systems that could potentially mimic the mechanical response …
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Multi-attribute evaluation of materials for shielding enclosures subjected to a marine environment
… structural, fire prevention/control, signature, ballistics, and weight requirements which have been developed for the composite mast. Some preliminary work has ready been done by NSWCDD and other supporting organizations. Studies to determine the electromagnetic environment, lightning and …
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Analysis of a Hybrid Rocket Burn Using Generalized Compressible Flow
… square ports. As an example, the internal ballistics of a hybrid rocket with circular ports is analyzed by transforming it to an equivalent solid grain with square ports having the same amount of solid fuel and burn time. The results obtained are similar to that of circular port but with a …
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Numerical Analysis of Gun Barrel Pressure Blast Using Dynamic Mesh Adaption
… mesh with moving boundary. Most CFD based ballistics-model requires additional thermodynamic functions which must be derived from the Noble-Abel equation of state. The unsteady, axisymmetric Navier Stokes equation systems were numerically solved using the Advection Upstream Splitting Method …
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MIT/DRAPER Technology Development Partnership Program : systems, aerodeceleration, and structural design of a high-G, rapid response, deployable autonomous aerial surveillance vehicle
… in the first year of the program. and focuses on Ballistics and aerodeceleration. Structures, and Systems Interface Design of the WASP. Although the two year timeline for the program precludes building the complete system, a series of "long-poles" are being used to demonstrate the concept …
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Spatial and temporal deformation pattern of the brain from blunt trauma
… the brain composition being either a 10% or 20% ballistics gelatin. To generalize, crown injuries cause higher strains than front impacts, and 5mph impacts cause larger strains than 3mph impacts. The 10% gelatin produce larger strain than 20% gelatin, but with large standard deviations. Contour …
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Micro, meso and macro materials processing using high-speed liquid projectiles
… techniques for projectile's external ballistics investigation was developed. Laser Particle Velocitimeter (PIN) and high speed filming were used for velocity measurements and visualization of images of water projectiles high speed filming revealed pulsing nature of projectile. A …
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Optimal Sizing and Control of Hybrid Rocket Vehicles
… the rocket. First, an analysis of the internal ballistics and the ascent trajectory has been carried out for different mass flow rates of the oxidizer as a function of time, for a fixed amount of oxidizer, in order to study the effect of throttling. Two equivalent problems are considered: in the …
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Science, warfare and society in the Renaissance, with particular reference to fortification theory
… dialling, surveying, navigation and mapping, ballistics and general architecture, evidence a similar cluster of ideas. The preference of the period was for theoretical technologies as against the mere following of successful craft practices. Earlier fortification theory involved a method of …
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Forensic firearms examination
… have allowed the development of automated ballistics imaging systems.Research, using the previously cited test bullets and cartridge casings, was conducted to evaluate the capability of the various systems, in conjunction with the abilities offirearms examiners. Three different automated …
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Surface Strain Measurement for Non-Intrusive Internal Pressure Evaluation of a Cannon
… using a method outline in IBHVG2 (Interior Ballistics of High Velocity Guns, version 2), and the model was validated using published experimental tangential strain testing data from a gun of the same caliber. The model was used to demonstrate the ideal location for strain measurement along …
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AN ANALYSIS OF THE BUCKLING BEHAVIOR OF SPINAL ANESTHESIA NEEDLES
… Gertie Marx and B.Braun Pencan needles in a ballistics gelatin tissue surrogate. In analyzing axial force changes, critical buckling load results were 27.65±0.918N. Due to the large force magnitude that can be withstood by spinal needles in compression, it can be concluded that the problem of …
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Performance of the UBC two-stage light-gas gun
… systems used by other researchers. The internal ballistics of the gun were modelled with a 1½ dimension Arbitrary Lagrange Eulerian computer code. The calculations had limited success in obtaining the measured projectile velocity. The calculations were also used to estimate the time difference …
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