Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Railgun"”.
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Electromagnetic Railgun Launchers: Practical and Theoretical Perspectives
Railguns are highly complex multi-disciplinary engineering systems that use electricity to launch projectiles at very high speeds. This dissertation investigates new technologies, models, and theories necessary for the development of practical systems to bring the railgun out of the lab and into …
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Study of advanced railgun hydrogen pellet injectors for fusion reactor refueling
An advanced railgun system has been developed to assess its feasibility as a hypervelocity hydrogen pellet injector for magnetically confined plasmas. It consists of a pellet generator/gas gun assembly for freezing hydrogen pellets and injecting them into the railgun at velocities as high as 1.5 …
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Design and Characterization of a Coaxial Plasma Railgun for Jet Collision Experiments
Plasma railguns are electromagnetic accelerators used to produce controlled high velocity plasma jets. This thesis discusses the design and characterization of a small coaxial plasma railgun intended to accelerate argon-helium plasma jets. The railgun will be used for the study of plasma shocks in …
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Modeling and Design of a Railgun-Driven Actuator for Ultrafast LVDC Circuit Breakers
L'abstract è presente nell'allegato / the abstract is in the attachment
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Improvement of Electromagnetic Railgun Barrel Performance and Lifetime by Method of Interfaces and Augmented Projectiles
<p>Several methods of increasing railgun barrel performance and lifetime are investigated. These include two different barrel-projectile interface coatings: a solid graphite coating and a liquid eutectic indium-gallium alloy coating. These coatings are characterized and their usability in a railgun …
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Fundamental Study and Development of a Hydrogen Pellet Accelerator Using a Fuseless Two-Stage Plasma-Arc-Driven Electromagnetic Railgun
… by means of a fuseless two-stage electromagnetic railgun system. This system consists of a pneumatic hydrogen pellet injector, which freezes and pneumatically pre-accelerates (with high-pressure helium as the propellant gas) cylindrical 1.6-mm-dia. by 1.75-mm-long hydrogen pellets, and a …
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Design, Optimization, and Testing of a Transaugmented Electromagnetic Railgun for Use as a Hydrogen Pellet Accelerator
… venting chambers placed between short augmented railguns to minimize viscous drag. The results of the 120-$\mu$s pulse experiments suggest that a multipulsed railgun pellet injection system may be capable of accelerating solid hydrogen pellets to high velocities.
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Interaction Between a High Density-Low Temperature Plasma and a Frozen Hydrogen Pellet in a Railgun Injector
Made available in DSpace on 2017-07-06T18:48:16Z (GMT). No. of bitstreams: 3 Grapperhaus_Michael_J_MS.pdf: 45697939 bytes, checksum: d3a56621b6f53381ba45ac0e8453ed77 (MD5) Grapperhaus_Michael_J_MS_ABS.pdf: 460664 bytes, checksum: 47d9b30f2141b65647b9fa3241f13603 (MD5) license.txt: 4813 bytes, …
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Characterization of Collisional Shock Structures Induced by the Stagnation of Railgun-driven Multi-ion-species Plasma-jets
… development of a small, linear, plasma-armature railgun designed to accelerate plasma jets in vacuum to high-Mach-number. This is followed by discussion of an experimental campaign to establish a plasma parameter space for the jets, in order to predict how effectively the accelerator can be used …
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System Design Considerations and the Feasibility of Passively Compensated, Permanent Magnet, Iron-Core Compulsators to Power Small Railgun Platforms
… aspects of compulsator design for use with railgun systems. Specifically, the design space is explored for passively compensated, permanent magnet iron-core compulsators. Seven design parameters are varied within a compulsator model developed for the Cal Poly Compulsator (CPCPA). The Matlab …
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Experimental Characterization of Diffusive Phenomena in Multi-Ion-Species Plasma Shocks Formed During Railgun-Driven Plasma Jet Collision Events
… plasma shocks. A linear plasma-armature railgun forms and accelerates low temperature, high density, supersonic plasma jets, with the collision between two of these jets shown to induce a collisional plasma shock in the first campaign. The second campaign leverages this experimental setup …
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Design, Fabrication, and Testing of an EMR Based Orbital Debris Impact Testing Platform
… the changes made from Cal Poly’s initial railgun system, the Mk. 1 railgun, to the Mk. 1.1 system, as well as the design, fabrication, and testing of a newer and larger Mk. 2 railgun system. The Mk. 1.1 system is developed as a more efficient alteration of the original Mk. 1 system, but is …
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A Finite Difference Approach to Modeling High Velocity/Variable Loads using the Timoshenko Beam Model
Electromagnetic launchers (railguns) are set to replace traditional large caliber ship mounted cannons in the near future. The success of the railgun depends heavily upon a comprehensive understanding of beam behavior during periods of heavy dynamic loading. It is hypothesized that the combination …
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The onset of gouging in high-speed sliding contacts
… as rocket sled test tracks, light gas guns, and railguns. Gouging takes the form of teardrop-shaped craters on the rail surface, and usually only occurs above a threshold speed which is dependent on the slider and rail material properties. In this dissertation, the onset of gouging was studied …
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Modeling of the electric ship
… of this thesis will focus on the electromagnetic railgun. Specifically I have developed of a model that simulates the charging and discharging an energy storage capacitor and will present the results.
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New Optimal-Control-Based Techniques for Midcourse Guidance of Gun-Launched Guided Projectiles
… guns, such as the Navy's electromagnetic railgun, these systems are a necessary part of the projectile design. This research focuses on a control scheme that uses the projectile's angle of attack as the single control in the development of an optimal control methodology that maximizes …
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Analysis of Electromagnetic Launcher Design and Modeling
… to gain a deeper understanding of the nature of railguns. The expressions are refined for ease of use and then compared to electromagnetic simulators that solve complex equations that arise from different rail geometry. Further simplifications lead to an expression for the final velocity of the …
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Aerodynamic Heating of a Hypersonic Naval Projectile Launched At Sea Level
Hypersonic flight at sea-level conditions induces severe thermal loads not seen by any other type of current hypersonic system. Appropriate design of the hypersonic round requires a solid understanding of the thermal environment. Numerous codes were obtained and assessed for their applicability to …