Papers

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What clients say:

The XLRotor is flexible, embeddable, and sharable. This makes it much easier for our team to deal with complex loading conditions and sensitivity tests. It also provides a simple communication process with our teammates and customers. The modeling is straightforward with abundant examples to learn from and use. Moreover, the technical support from Dr. Murphy is extremely helpful and insightful.

Wenchao Wang
Lead Engineer, IDC Technical Services, Germantown Hills, Illinois

Papers

Dr. Murphy has authored or co-authored more than 30 technical papers, titles of which are listed below.

Inertial energy storage for home or farm use based on a flexible flywheel Vance, JM and Murphy, BT 1980 Flywheel technology symposium, ASME and DEO, pg 75-87
Labyrinth Seal Effects on Rotor Whirl Instability Murphy, B. and Vance, J. Institution of Mechanical Engineers, Conference Publications, 1980, I Mech E Conf Publ 1980-4, Int Conf – Vib in Rotating Mach, 2nd, Sep 1-4 1980, Cambridge, Engl, p 369-373
Extension of the Transfer Matrix Method for Rotordynamic Analysis to Include a Direct Representation of Conical Sections and Trunnions Darlow, M., Murphy, B., Elder, J., and Sandor, G. Journal of Mechanical Design, Transactions of the ASME, v 102, n 1, Jan, 1980, p 122-129
Improved Method for Calculating Critical Speeds and Rotordynamic Stability of Turbomachinery BT Murphy, JM Vance Proceedings of the Tenth Turbomachinery Symposium., 1981, p 141-146.
An improved method for calculating critical speeds and rotordynamic stability of turbomachinery BT Murphy, JM Vance Journal of Engineering for Power, Transactions ASME, v 105, n 3, Jul, 1983, p 591-595 ISSN: 0022-0825
Critical Speeds Of Turbomachinery Computer Predictions vs. Experimental Measurements JM Vance, BT Murphy, and HA Tripp Proceedings of the Thirteenth Turbomachinery Symposium., 1984, Houston, TX, USA, p 105-130.
Eccentricity measurements on a 5-pad tilting-pad bearing BT Murphy, HA Tripp ASLE Transactions, v 28, n 2, Apr, 1985, p 217-224 ISSN: 0569-8197
Critical Speeds of Turbomachinery: Computer Predictions vs. Experimental Measurements PART II: Effects of Tilt-Pad Bearings and Foundation Dynamics J. M. Vance, B. T. Murphy, H. A. Tripp Journal of Vibration, Acoustics, Stress, and Reliability in Design, v 109, n 1, Jan, 1987, p 8-14 ISSN: 0739-3717
Critical Speeds of Turbomachinery Computer Predictions vs. Experimental Measurements PART I: The Rotor Mass- Elastic Model J. M. Vance, B. T. Murphy, H. A. Tripp Journal of Vibration, Acoustics, Stress, and Reliability in Design, v 109, n 1, Jan, 1987, p 1-7 ISSN: 0739-3717
SSME HPFTP wavy interstage seal. Part II. Rotordynamic analysis Murphy, B.T.; Scharrer, J.K.; Hawkins, L.A. American Society of Mechanical Engineers, Design Engineering Division (Publication) DE, v 18-2, 1989, Machinery Dynamics – Applications and Vibration Control Problems, Sep 17-21 1989, Montreal, Que, Can, p 101-107
Measurement of Rotordynamic Coefficients for a Hydrostatic Radial Bearing Murphy, B. and Wagner, M. Journal of Tribology, Transactions of the ASME, v 113, n 3, Jul, 1991, p 518-525 ISSN: 0742-4787
Suppression of sybsynchronous vibration in the SSME HPFTP Becht, D, Hawkins, L, Scharrer, J, Murphy, B 1990 TAMU workshop on rotordynamic instability in high performance turbomachinery.
The rocketdyne multifunction tester – Part I: Test method Murphy, BT, Scharrer, J, Sutton, RF 1990 TAMU workshop on rotordynamic instability in high performance turbomachinery.
The rocketdyne multifunction tester – Part II: operation of a radial magnetic bearing as an excitation source Hawkins, LA, Murphy, BT, Lang, KW 1990 TAMU workshop on rotordynamic instability in high performance turbomachinery.
Influence of mounting compliance on the dynamic stiffness of ball bearings: analysis and test results MF Butner, BT Murphy, RA Akian ASME 13th Biennial Vibrations conference, Miami, 1991
Bearing Parameter measurement using power spectral density methods C Rouvas, BT Murphy and RK Hale IMECHE conference on rotordynamics, Bath, England, 1992.
Improved unbalance response calculations using the polynomial method BT Murphy 2nd Latin American Turbomachinery conference, 1993
Optimization and critical design issues of the air core compulsator for the cannon caliber electromagnetic launcher system (CCEML) JR Kitzmiller,  SB Pratap, TA Aanstoos, KG Cook, RA Keunast, BT Murphy, DE Perkins IEEE Transactions on Magnetics, v31, 1, Jan, 1995
Laboratory testing of the pulse power system for the cannon caliber electromagnetic gun system (CCEMG) JR Kitzmiller, SB Pratap, MD Werst, CE Penney, TJ Hotz, BT Murphy IEEE Transactions on Magnetics, v 33, n 1 pt 1, Jan, 1997
Compulsator rotordynamics and suspension design BT Murphy, SM Manifold, JR Kitzmiller IEEE Transactions on Magnetics, v 33, n 1 pt 1, Jan, 1997
Bearing loads in a vehicular flywheel battery BT Murphy, DA Bresie, JH Beno SAE Special Publications, v 1243, Feb, 1997, Electric and Hybrid Vehicle Design Studies, Proceedings of the 1997 International Congress and Exposition, Feb 24-27 1997, Detroit, MI
Design, Fabrication, and Testing of 10 MJ Composite Flywheel Energy Storage Rotors J. H. Herbst, S. M. Manifold, B. T. Murphy. J. H.  Price, R. C. Thompson, W. A. Walls, A. Alexander, K.Twigg SAE Aerospace power systems conference, 1998, Paper #981282, pp. 235-244.
Transient analysis of a flywheel battery containment during a full rotor burst event BJ Hsieh, RF Kulak, JH Price, BT Murphy American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, v 370, 1998, Finite Element Appications: Linear, Non-Linear, Optimization and Fatigue and Fracture, Proceedings of the 1998 ASME/JSME Joint Pressure Vessels and Piping Conference, Jul 26-30 1998, San Diego, CA, USA, p 101-106
Subscale Rotor Spin Testing for Compulsator Component Development K. G. Cook, B. T. Murphy, S. M. Manifold, T. Park, M. D. Werst, J. R. Kitzmiller, W. A. Walls, A. Alexander, K. Twigg IEEE Transactions on Magnetics, Vol 35, No. 1, Jan 1999.
Application of Permanent Magnet Bias Magnetic Bearings to an Energy Storage Flywheel Lawrence A. Hawkins, Brian T. Murphy and John Kajs 5th Int. Symp. on Magnetic Suspension Technology, 1999
Control system for inside-out configuration magnetic bearings GB Buckner, A Palazzolo, J Kajs, BT Murphy, J Beno 5th Int. Symp. on Magnetic Suspension Technology, 1999
Analysis and Testing of a Magnetic Bearing Energy Storage Flywheel with Gain-Scheduled, Mimo Control Lawrence A. Hawkins, Brian T. Murphy and John Kajs ASME Turbo Expo, IGTI, 2000
Active magnetic bearings for energy storage systems for combat vehicles MA Pichot, JP Kajs, BT Murphy, A Ouroua, BM Rech, RJ Hayes, JH Beno IEEE Transactions on Magnetics, v 37, n 1, Jan 2001.
Rotordynamics design and test results for a model scale compulsator rotor Murphy, B.T., Kitzmiller, J.R.;Zowarka, R.;Hahne, J.;Walls, A. IEEE Transactions on Magnetics, v 37, n 1 I, January 2001
Shock and Vibration Testing of an Amb Supported Energy Storage Flywheel L.A. Hawkins, B.T. Murphy, J. Zierier, and R. Hayes 8th International Symposium on Magnetic Bearings, Zurich, Switzerland, 2002
Permanent Magnet Bias, Homopolar Magnetic Bearings for a 130 kW-hr Composite Flywheel Brian T. Murphy, Hamid Ouroua, Matthew T. Caprio, John D. Herbst 9th International Symposium on Magnetic Bearings, Lexington, KY, 2004
Spin Commissioning and Drop Tests of a 130 kW-hr Composite Flywheel Matthew T. Caprio, Brian T. Murphy, John D. Herbst 9th International Symposium on Magnetic Bearings, Lexington, KY, 2004
Transient Response of Rotor on Rolling Element Bearings with Clearance David P. Fleming, Brian T. Murphy, Jerzy T. Sawicki and J. V. Poplawski 7th IFToMM Conference on Rotor Dynamics, Vienna, Austria, 25-28 September 2006
Testing of A 3 MW High Speed Generator and Turbine Drive for A Hybrid Vehicle Propulsion System Robert F. Thelen, John D. Herbst, Doug Wardell, Brian T. Murphy and Benjamin Canilang Proceedings of GT2007, ASME Turbo Expo 2007: Power for Land, Sea and Air, May 14-17, 2007, Montreal, Canada
Low Cost Flywheel Energy Storage for a Fuel Cell Powered Transit Bus C.S Hearn, M.M. Flynn, M.C. Lewis, R.C. Thompson, B.T. Murphy, R.G. Longoria Vehicle Power and Propulsion Conference, Sept 9-12, 2007. VPPC 2007, IEEE. ISBN:978-0-7803-9760-6
Simplified Morton Effect Analysis for Synchronous Spiral Instability Brian T. Murphy and Joshua A. Lorenz Proceedings of PWR2009, ASME Power, July 21-23, 2009, Albuquerque, New Mexico.
Modeling of Electric Ship Power Systems A. Ouroua, B. Murphy, J. Herbst, R. Hebner 2009 Conference on Grand Challenges in Modeling and Simulation (GCMS’09), Istanbul, Turkey, July 13-16, 2009, pp. 191-197
Design and development of a high precision, high payload telescope dual drive system M. Worthington, T.A. Beets, J.H., Beno, J.R. Mock, B.T. Murphy, B.J. South, and J.M. Good Proc. SPIE Astronomical Telescopes and Instrumentation, San Diego, CA, USA, June 27 to July 2, 2010, paper no. 7733-201
Simulating Mode Transitions during Breakdown in Liquids Brian T Murphy, Edward F Kelley and Robert E Hebner IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 18, Issue 3, pp. 682-691, June 2011
Case Study of Morton Effect Shaft Differential Heating in a Variable-Speed Rotating Electric Machine Joshua A. Lorenz and Brian T. Murphy ASME IGTI Turbo Expo, Vancouver, BC, June, 2011
Measurement of frequency dependent sensitvity and phase characteristics of eddy current displacement transducers BT Murphy