• 3-D Electromagnetic Analysis of Armatures and Rails for High Launch Energy Applications 

      Liu, H-P.; Lewis, M.C. (IEEE, 2009-01)
      Transient three-dimensional (3-D) electromagnetic analyses have been performed on armatures and rails which are intended to be used for high launch energy applications. Coupled magnetic and thermal diffusions were solved ...
    • 3D Transient Modeling of Bulk High Temperature Superconducting Material in Passive Magnetic Bearing Applications 

      Pratap, S. B.; Hearn, C. (, undated)
      Bulk high temperature superconductors (HTSC) are being considered for use in several engineering applications including passive magnetic bearings. These bearings besides being passive i.e. inherently stable also offer the ...
    • 9 MJ Laboratory Gun and Range at The University of Texas at Austin 

      Zowarka, R. C.; Peterson, D. R.; Price, J. H.; Weldon, W. F. (IEEE, 1989-01)
      The authors describe a 9 MJ laboratory gun and range program. The goal of the program is to demonstrate a single-shot EM (electromagnetic) gun suitable for establishing gun parameters for repetitive EM gun systems and for ...
    • 9 MJ Range Gun Compulsator Stator Design and Fabrication 

      Herbst, J.D.; Cook, K.G.; Kuenast, R.A.; Pratap, S.B.; Thompson, R.C.; Yun, H.D. (IEEE, 1993-01)
      The authors provide a summary of the structural analysis of the compulsator stator as well as a detailed description of the major stator components. Fabrication and assembly techniques are also presented, along with the ...
    • AARADCOM/DARPA Compact Homopolar Generator 

      Gully, J.H.; (IEEE, 1982-01)
      If electromagnetic (EM) rail guns are to be used to propel substantial projectiles, large amounts of energy must be delivered in a fast, high-current pulse. Homopolar generators (HPGs) store megajoules (MJ) of energy in ...
    • Accelerating the Simulation of Shipboard Power Systems 

      Uriarte, F.M.; Hebner, R.E.; Gattozzi, A.L. (Society for Modeling & Simulation International, 2011)
      This paper presents an approach to accelerate the simulation of shipboard power systems. A common issue in the ship research community is the simulation run time of large-scale shipboard power systems. A contributor to ...
    • Active Current Management for Four-Rail Railguns 

      Beno, J.H.; Weldon, W.F. (IEEE, 1991-01)
      A system of auxiliary conductors designed to reduce current density peaks in railgun rails for four-rail, round-bore railguns is described. The effects on rail current density and projectile force are discussed. Railgun ...
    • Active Magnetic Bearings for Energy Storage Systems for Combat Vehicles 

      Pichot, M.A.; Kajs, J.P.; Ouroua, A.; Murphy, B.T.; Rech, B.; Hayes, R.J.; Beno, J.H.; Buckner, G.D.; Palazzolo, A.B. (IEEE, 2001-01)
      Advanced energy storage systems for electric guns and other pulsed weapons on combat vehicles present significant challenges for rotor bearing design, Active magnetic bearings (AMBs) present one emerging bearing option ...
    • Active Suspension System Energy and Power Requirements for Military Applications 

      Beno, J.H.; Hoogterp, F.B.; Weeks, D.A. (, 1995-10)
    • An Actively Switched Pulsed Induction Accelerator 

      Ingram, M. W.; Andrews, J. A.; Bresie, D. A. (IEEE, 1991-01)
      A coaxial accelerator which will launch a 45 mm diameter, 225 g-mass to 2000 m/s is described. The launcher is a true induction device, as no current feed to the armature is provided. The armature is a multiturn design, ...
    • Advanced Compulsator Design 

      Driga, M. D.; Pratap, S. B.; Weldon, W. F. (IEEE, 1989-01)
      The compulsator or compensated pulsed alternator is the name for a large family of high-energy pulsed-power rotation machinery. It covers an extensive range of currents, voltages, pulse shapes, and also frequency in the ...
    • Advanced Compulsator Technology 

      Pratap, S.B.; (IEEE, 1993-01)
      Compulsator selection issues are addressed, including two poles vs. four poles, shell vs. conventional rotors, relation between pulse shape and energy density, and would compensation. Electrothermal guns require a current ...
    • Advanced Compulsators for Railguns 

      Pratap, S.B.; Hsieh, K.T.; Driga, M.D.; Weldon, W.F. (IEEE, 1989-01)
      In order to maximize the penetration of a projectile into a target, the acceleration on the projectile during the launch must be minimized. Low accelerations permit the design of long and slender projectiles which have ...
    • Advanced Flywheel Technology for Space Applications 

      Thompson, R.C.; Pak, T.T. (IEEE, 2004-07)
      For spacecraft applications, energy storage sources are required to produce a high yield with minimum size and mass. Flywheel systems have the potential to fill this need while also providing attitude control for the ...
    • Advanced Induction Motor End Ring Design Features for High Speed Applications 

      Caprio, M.T.; Lelos, V.; Herbst, J.D.; Upshaw, J.L. (IEEE, 2005-05)
      This paper presents advancements in induction motor endring design to overcome mechanical limitations and extend the operating speed range and joint reliability of induction machines. A novel endring design met the challenging ...
    • Analysis of Defective Hydrostatic Radial Bearings for Five Megajoule Homopolar Generator 

      Rylander, H.G.; Weldon, W.F. (American Society of Mechanical Engineers, 1980)
      Hydrostatic bearings were designed for a five megajoule homopolar generator since they offered the advantages of low shaft friction, high load capacity and high stiffness independent of shaft speed. The original bearings ...
    • Analytical Description of a Series Fault on a DC Bus 

      Gattozzi, A.L.; Herbst, J.D.; Uriarte, F.M.; Hebner, R.E. (IEEE, 2012-01)
      The solution of the equations of a dc circuit containing an arc is given and compared with experimental data. The arc is modeled according to its classical equivalent circuit and the adequacy of this model is discussed. ...
    • An Application Guide for Compulsators 

      Kitzmiller, J.R.; Pratap, S.B.; Driga, M.D. (IEEE, 2003-01)
      Focus toward advanced mobile tactical configurations for railgun power supplies has resulted in the evolution of five compulsator generations in the past 15 years. Unfortunately, the rapid maturation of the technology has ...
    • Application of Electromagnetic Guns to Future Naval Platforms 

      Walls, W.A.; Weldon, W.F.; Pratap, S.B.; Palmer, M.; Adams, D. (IEEE, 1999-01)
      Designs for future naval vessels are strongly considering electric drive systems. Already employed in commercial cruise ships, electric drive offers the advantages of increased ship design flexibility, improved efficiency, ...
    • An Approximate Model for Studying Harmonic Current Amplifications in Current- Source Inverter Fed Induction Motor 

      Hsu, J.S.; (IEEE, 1992-12)
      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 ...