• Parameter Studies for Traveling Wave Coaxial Launchers 

      Wu, A. Y.; (IEEE, 1991-01)
      The traveling wave coaxial launcher is a complex machine that requires very extensive parameter studies to optimize. Most of previous attempts to realize hypervelocity using coaxial launchers have failed partly due to ...
    • Parametric Approach to Linear Induction Accelerator Design 

      Bresie, D. A.; Andrews, J. A.; Ingram, M. W. (IEEE, 1991-01)
      A parametric approach to defining effective accelerator designs is described. This method uses a computer optimization routine to iteratively seek out effective designs. The optimization routine is forced to search within ...
    • Permanent Magnet Bias, Homopolar Magnetic Bearings for a 130 kW-hr Composite Flywheel 

      Murphy, B.T.; Ouroua, A.; Caprio, M.T.; Herbst, J.D. (, 2004-08)
      The Center for Electromechanics at the University of Texas at Austin is developing a power averaging flywheel battery for a high speed passenger locomotive as part of the Federal Railroad Administration’s Next
    • Physical Scale Modeling to Predict Current Diffusion in Solid Armatures 

      Pappas, J. A.; Driga, M. D.; Weldon, W. F. (IEEE, 1989-01)
      Scaling laws relating current diffusion in a high-conductivity material at low velocity to current diffusion in a lower conductivity material are derived. The design of an experiment to determine the validity of the scaling ...
    • Physical Scale Modeling to Verify Energy Storage Inductor Parameters 

      Zowarka, R.C.; (IEEE, 1984-03)
      In the pulse charging and discharging of energy storage inductors, the influence of I2R heating, magnetic diffusion skin depth, and eddy current losses must be evaluated. These effects are not easily treated analytically. ...
    • Plasma Armature Railgun Launcher Simulations at The University of Texas at Austin 

      Weeks, D. A.; Weldon, W. F.; Zowarka Jr, R. C. (IEEE, 1989-01)
      A velocity-dependent friction model that accurately predicts the losses associated with a plasma armature railgun is presented. Test results from a 1-m-long, 1.27-cm square-bore, plasma-armature railgun have been used to ...
    • Plasma Armature Railgun Launcher Simulations at The University of Texas at Austin 

      Weeks, D. A.; Weldon, W. F.; Zowarka, Jr, R. C. (IEEE, 1989-01)
      A velocity-dependent friction model that accurately predicts the losses associated with a plasma armature railgun is presented. Test results from a 1-m-long, 1.27-cm square-bore, plasma-armature railgun have been used to ...
    • Possible Errors in Measurement of Air-Gap Torque Pulsations of Induction Motors 

      Hsu, J.S.; Woodson, H.H.; Weldon, W.F. (IEEE, 1992-03)
      Measurements based on the accurately obtained air gap flux data using either the search-coil or the Hall-effect approach are not error proof. This is because even the unbalanced leakage effects can be reduced to a minimal ...
    • Power Converters for Railguns 

      Pappas, J.A.; Piccone, D.E. (IEEE, 2001-01)
      The University of Texas at Austin Center for Electromechanics (UT-CEM) has been developing power converters for use with DC railguns. Special design rules have been established and demonstrated in the construction of ...
    • Power Electronics and Controls for Air Core Compulsator 

      Wehrlen, D.J.; Lee, R.A.; Thelen, R.F. (IEEE, 1995-01)
      The Center for Electromechanics at the University of Texas (GEM-UT) has been engaged in a large scale effort to develop the power electronics and control systems required to demonstrate a multi-megawatt, full control, SCR ...
    • Power Grid for a Naval Electric Ship - AC versus DC 

      Davey, K.; Hebner, R.E. (, undated)
      The debate over the best electric grid topology for an all electric ship has provoked discussion on a wide range of topics, spanning interconnection issues, transmission losses, and power preferences of electronic components, ...
    • Power Supply Technology for Electric Guns 

      Gully, J. H.; (IEEE, 1991-01)
      Because there are multiple power supply options being developed to power electric guns, there is no single component which could become an obstacle that could limit the technology. Pulsed power supply technology is developing ...
    • Power Systems Study for Two Variable Specific Impulse Magnetoplasma Rocket Applications 

      Meintanis, E.; Bengtson, R.D.; Hebner, R.E. (American Society of Civil Engineers, 2002)
      In this study, we analyze the power storage systems needed for operational tests of a Variable Specific Impulse Magnetoplasma Rocket (VASIMR) on the International Space Station (ISS). Two tests are considered: a short-term ...
    • Predicted versus Actual Performance of a Model Scale Compulsator System 

      Kitzmiller, J.R.; Cook, K.G.; Hahne, J.J.; Hotz, T.J.; Manifold, S.M.; Pappas, J.A.; Penney, C.E.; Pratap, S.B.; Rech, B.; Thelen, R.F.; Walls, W.A.; Werst, M.D.; Zowarka, R.C. (IEEE, 2001-01)
      Performance testing of the model-scale CPA was completed at the University of Texas Center for Electromechanics. A major part of the project was the development of design and simulation codes that would accurately represent ...
    • Prediction of Windage losses of an Enclosed High Speed Composite Rotor in Low Air Pressure Environments 

      Liu, H-P.; Werst, M.D.; Hahne, J.J.; Bogard, D. (American Society of Mechanical Engineers, 2003-07)
      The frictional windage losses associated with non-ventilated airflows in the air gaps between the rotor and stator of a high speed rotating machine can greatly influence the rotor outer and stator inner surface temperatures. ...
    • Preliminary Design of a 1 Gigajoule Homopolar Generator 

      Headifen, G.R.; Pappas, J.A.; Weldon, J.M.; Wright, J.C.; Price, J.H.; Gully, J.H.; Brunson, G. (IEEE, 1993-01)
      A high-energy, high-voltage homopolar generator (HPG) has been designed. The HPG will have composite flywheels to maximize energy storage density and a multipass armature to achieve high output voltage. The HPG is designed ...
    • Prime mover and energy storage considerations for a hydrogen-powered series hybrid shuttle 

      Flynn, M.M.; Hearn, C.; Lewis, M.; Thompson, R.C.; Longoria, R. (IEEE, 2007-09)
      This paper describes simulation results obtained through modeling the operation of a 6.7 m long hydrogen-powered shuttle bus. The actual shuttle bus and its hydrogen refueling station constitute the first of its kind in ...
    • Producing and Gauging Precision Railgun Bore 

      Peterson, D. R.; Harville, M.; Weldon, W. F.; Zowarka Jr, R. C.; Price, J. H.; Connor, T. (IEEE, 1989-01)
      The authors discuss the use and results of a bore finishing and measuring system for obtaining and quantifying precision bores in railguns. The bore finishing system has been specially designed and installed to enable ...
    • Professional Responsibility: The Role of Engineering in Society 

      Nichols, S.P.; Weldon, W.F. (, 1997-07)
      We argue that the practice of engineering does not exist outside the domain of societal interests. That is, the practice of engineering has an inherent (and unavoidable) impact on society. Engineering is based upon that ...
    • Progression of lipid profile and cell structure in a research-scale production pathway for algal biocrude 

      Beal, C.M.; Hebner, R.E.; Romanovicz, D.K.; Mayer, C.C.; Connelly, R.L. (Elsevier, 2013-02)
      Although there has been a large research effort associated with individual parts of various algal biofuel production pathways, few studies have tracked changes in product composition throughout an integrated biofuel ...