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Homopolar Pulsed Welding of API Line Pipe
Homopolar pulse welding is a welding process that is being developed to rapidly join API line pipe. This process has particular potential for application in offshore pipeline construction utilizing the J lay method. The ...
Electromagnetic Force, Jerk, and Electric Gun Projectile Design
As railgun projectiles have become more sophisticated, attention is being given to railgun produced electromagnetic forces that affect the mechanical loading of the projectile. The rate at which a launch package is accelerated ...
Iron Core Compulsators for Railgun Power Supplies
Recent development efforts on compulsator based railgun power supplies have been focused on lightweight, composite, self-excited machines. However, operating experience with the Iron-core (ferromagnetic) compulsator at the ...
Turbine Drives for Compulsators
Effective integration of compact, air-core, compensated pulsed alternators (compulsators) into mobile platforms will likely require a lightweight, high-power turbine to motor the compulsator rotor. Self-motoring compulsators ...
Generation of High Toroidal Magnet Fields Using Single-Turn Magnet Technology
The production of very high magnetic fields in a toroidal configuration has been accomplished using single-turn magnet technology coupled with low voltage, high current homopolar generators (HPGs). Single-turn, toroidal ...
An Approximate Model for Studying Harmonic Current Amplifications in Current- Source Inverter Fed Induction Motor
The nature of harmonic current amplification in current source inverter fed induction motors is studied through a six-pulse current source inverter. An approximate model consisting of the induction motor and the parallel ...
Steady State Performance of Reluctance Motors Under Combined Fundamental and Third Harmonic Excitation Part I: Theoretical Analysis
The steady-state performance of two prototype polyphase reluctance motors, grooved and segmental types, under combined fundamental and third-harmonic excitation was studied by using injected third-harmonic magnetomotive ...
Single Shot Gun 9 MJ EM Gun Experiment
Homopolar Pulsed Welding of Steel Pipe: Effects of Controlled Parameters on Weld Properties
This paper reports on recent and continuing research into the optimization of the homopolar pulsed weld (HPW) process for welding 89-mm diameter, ASTM 1035 steel pipe. Present study characterizes the typical macro- and ...