Professor
Department of Mechanical and Aerospace Engineering
University of Virginia
P. O. Box 400746
Charlottesville, VA 22904-4746
Office: 314 MEC Building
Phone: 434-924-6227
Fax: 434-982-2037
E-mail: ehm7s@virginia.edu
- PhD, 1990, University of Virginia, Mechanical and Aerospace
Engineering, "Magnetic Bearing Synthesis for Rotating Machinery"
- BS, 1980, Cornell University, Mechanical Engineering
- Professor, University of Virginia, 2003-present
- Associate Professor, University of Virginia, 1995-2003
- Assistant Professor, University of Virginia, 1990-1995
- Graduate Research Assistant, University of Virginia, 1986-1990
- Engineer, Research and Development, Koppers Company, 1980-1985
Dr. Maslen conducts research in the application of automatic control theory to
mechanical systems for vibration reduction and stability. He is particularly interested in
the use of magnetic bearings in turbomachinery. He is also involved in the design of
magnetic actuators, sensors, power amplifiers, and feedback controllers.
Past projects have included:
- Self sensing magnetic bearings: the National Science Foundation
- Force characterization and surge control in centrifugal compressors: ROMAC internal effort
- Rotordynamic Model Reconciliation: ROMAC internal effort
- Rotating Machinery Stability Test Methods: ExxonMobil
Research Corp. and Petrobras.
- Control of lossy magnetic actuators: by the National Science
Foundation
- Flow visualization for vortex breakdown using a magnetically
levitated and motored sphere: the National Science Foundation
- Fault tolerant magnetic bearings: Mobil Corporation
- Artificial heart using magnetic bearings: University of Utah, Artificial Heart Lab
- Pre-crash sensing and damage mitigation for automobiles: National Highway Transit Safety Administration
- Performance review and audit of gas pipeline compressors with magnetic bearings: Nova Gas Transmission, Ltd.
- Improved modelling of electrodynamic behavior of magnetic bearing stators: Kingsbury Bearings, Inc.
- Magnetic bearings for spinning anode X-Ray tubes: Timken Corp., Miniature Precision Bearings Division
- Loss measurements in high speed magnetic bearings: NASA Lewis Research Center
- ENGR164 Engineering Design
- MAE202 Applications of Electronics
- ENGR205 Solid Mechanics I
- ME346 Elements of Mechanical Design
- MAE381 Experimental Methods Laboratory
- MAE384 Mechanical Engineering Laboratory
- ME445/MAE473 Introduction to Automatic Controls
- MAE461/MAE462 Machine Design I/II
- ME471 Digital Instrumentation and Control
- ME472 Electromechanical Machinery
- Magnetic Bearings graduate
seminar
- MAE621 Analytic Dynamics
- MAE752 Modern Control
- Senior Thesis advisor
- Schweitzer, G. and Maslen, E. (Eds.), "Magnetic Bearings
Theory, Design, and Application to Rotating Machinery," Springer, 2009
- Allaire, P. E., Maslen, E. H., Humphris, R. R., Knospe, C. R., and
Lewis, D. W., "Magnetic Bearings," Chapter in CRC Handbook of
Lubrication (Theory and Practice of Tribology), ed. E. Richard Booser,
CRC Press, Ann Arbor, 1994.
Journal Publications
- Maslen, E. H., Iwasaki, T. and Mahmoodian, R., "Field and gap estimation in magnetic
bearings: a Lyapunov approach," accepted for publication in the Journal of the Japan Society
of Applied Electromagnetics and Mechanics.
- Cloud, C. H., Maslen, E. H., and Barrett, L. E., "Damping Ratio Estimation Techniques for
Rotordynamic Stability," accepted for publication in the ASME Journal of Engineering for Gas
Turbines and Power.
- Jerzy T. Sawicki, Eric H. Maslen and Kenneth R. Bischof, "Modeling and Performance Evaluation
of a Machining Spindle with Active Magnetic Bearings," KSME Journal of Mechanical Science and
Technology, Vol. 21, No.6, pp. 847-850, 2007.
- Charlotte Barbier, Joseph A.C. Humphrey, and Eric Maslen, "Experimental Study of the
Flow in a Simulated Hard Disk Drive," ASME Journal of Fluids Engineering, Vol 128, No. 5,
pp. 1090-1100.
- Qingyu Wang and Eric H. Maslen,"Identification of Frequency Dependent Parameters in a Flexible
Rotor System," ASME Journal of Engineering for Gas Turbines and Power, Vol. 128, No. 3,
July 2006, pp. 670-676.
- Maslen, E. H., Montie, D. T., and Iwasaki, T., "Robustness Limitations in Self-sensing
Magnetic Bearings," ASME Journal of Dynamic Systems, Measurement, and Control, Vol. 128,
No. 2, June 2006, pp. 197-203.
- Zhu, L., Knospe, C. R., and Maslen, E. H., "An Analytic Model for a
Non-laminated Cylindrical Magnetic Actuator Including Eddy Currents," IEEE
Transactions on Magnetics. Vol. 41, No. 4, April 2005. pp 1248-1258.
- Ahn, H-J., Maslen, E. H., and Iwasaki, T., "Feasibility Analysis for
the Rotordynamic Performance of API617," ASME Journal of Engineering
for Gas Turbines and Power. Vol. 127, No. 2, April 2005, pp. 418-424.
- Cloud C. H., Foiles W. F., Li G., Maslen E. H. and Barrett L.E.,
"Practical Applications of Singular Value Decomposition in Rotordynamics,"
Australian Journal of Mechanical Engineering, Vol. 2, No. 1, pp. 21-32.
- Meeker, D. C., Filatov, A. V., and Maslen, E. H., "Effect of Magnetic
Hysteresis on Rotational Losses in Heteropolar Magnetic Bearings,"
IEEE Transactions on Magnetics, vol. 40, no. 5, September 2004, pp. 3302 - 3307.
- Vazquez, J. A., Maslen, E. H., Ahn, H-J, Han, D-C, "Model Identification of a
Rotor with Magnetic Bearings", ASME Journal of Engineering for
Gas Turbines and Power, 125 (1), pp. 149-155, January 2003.
- Baun, D. O., Maslen, E. H., Knospe, C. R., and Flack, R. D., "A
Multiple Harmonic Open Loop Controller for Hydro/Aerodynamic Force
Measurements in Rotating Machinery using Magnetic Bearings," ASME
Journal of Engineering for Gas Turbines and Power, Vol. 124,
No. 4, pp. 827-834, October 2002.
- Filatov, A. V., Maslen, E. H., and Gillies, G. T., "Stability of an
Electrodynamic Suspension,"
Journal of Applied Physics, 92(6): 3345-3353, September 2002.
- Maslen, E. H., Sortore, C. K., Vazquez, J. A., and Knospe, C. R., "Synchronous
Response Estimation in Rotating Machinery," ASME
Journal of Engineering for Gas Turbines and Power,
124(2): 357-362, April 2002.
- Maslen, E. H., Vazquez, J. A., and Sortore, C. K., "Reconciliation of Rotordynamic
Models with Experimental Data," ASME Journal of Engineering for Gas
Turbines and Power 124(2): 351-356, April 2002.
- Setiawan, J. D., Mukherjee, R., and Maslen, E. H., "Synchronous Sensor
Runout and Unbalance Compensation in Active Magnetic Bearings Using Bias
Current Excitation," ASME Journal of Dynamic Systems, Measurement, and
Control, Vol. 124, March 2002, pp. 14-24.
- Filatov, A. V., Maslen, E. H., and Gillies, G. T., "A Method of
Noncontact Suspension of Rotating Bodies Using Electromagnetic Forces,"
Journal of Applied Physics, 91(4): 2355-2371, February 2002.
- Filatov, A V., and Maslen, E. H., "Passive magnetic bearing for flywheel
energy storage systems," IEEE Transactions on Magnetics.
v 37 n 6, November 2001. p 3913-3924 .
- Maslen, E. H., and Montie, D. T.,
"Sliding Mode Control of Magnetic Bearings: a Hardware Perspective,"
ASME Journal of Engineering for Gas Turbines and Power,
Vol. 123 No. 4, October 2001, pp. 878-885.
- Montie, D. T., and Maslen, E. H.,
"Self-Sensing in Fault Tolerant Magnetic Bearings"
ASME Journal of Engineering for Gas Turbines and Power, Vol. 123, No. 4,
October 2001,
pp. 864-870.
- Setiawan, J. D., Mukherjee, R., and Maslen, E. H., "Adaptive Compensation of Sensor
Runout for Magnetic Bearings with Uncertain Parameters: Theory and Experiments,"
ASME Journal of Dynamic Systems, Measurement,
and Control, Vol. 123, No. 2, June 2001.
- Carlson-Skalak, S. , Ting, Y. and Maslen, E. ,
"Magnetic Bearing Actuator Design using Genetic Algorithms,"
Journal of Engineering Design,
Vol. 10, No. 2, 1999, pp. 143-164.
- Kasarda, M. E. F., Allaire, P. E., Norris, P. M., Mastrangelo, C., and Maslen, E. H.,
"Experimentally Determined Rotor Power Losses in Homopolar and Heteropolar Magnetic Bearings,"
ASME Journal of Engineering for Gas Turbines and Power
Vol 121, No 4, October 1999.
- Maslen, E. H., Sortore, C. K., Williams, R. D., Fedigan, S. J, and Aimone, R. J.,
"Fault Tolerant Magnetic Bearings,"
ASME Journal of Engineering for Gas Turbines and Power,
Vol. 12, No. 3, July 1999, pp. 504-508.
- Maslen, E. H., Bearnson, G. B., Allaire, P. E., Flack, R. D., Baloh, M., Hilton, E. F., Noh, M. D., Olson, D. B., Khanwilkar, P. S., and Long, J. D.,
"Feedback Control Applications in Artificial Hearts,"
IEEE Control Systems Magazine, vol.18, no. 6, December 1998, pp. 26-34.
- Meeker, David C., and Maslen, Eric H.,
"Prediction of Rotating Losses in Heteropolar Radial Magnetic Bearings,"
ASME Journal of Tribology, Vol. 120, No.3, July 1998, pp 629-635.
- Allaire, P. E., Hilton, E., Baloh, M., Maslen, E., Bearnson, G., Noh, D., Khanwilkar. P., and Olsen, D.,
"Performance of a Continuous Flow Ventricular Assist Device: Magnetic Bearing Design, Construction, and Testing,"
Artificial Organs, 22(6): pp. 475-480, 1998.
- Kasarda, M. E. F., Allaire, P. E., Maslen, E. H., Brown, G. V., and Gillies, G. T.,
"High Speed Rotor Losses in a Radial 8-Pole Magnetic Bearing, Part II: Analytical/Empirical Model and Calculations,"
ASME Journal of Engineering for Gas Turbines and Power,
Vol. 120, No. 1, January 1998, pp. 110-114.
- Kasarda, M. E. F., Allaire, P. E., Maslen, E. H., Brown, G. V., and Gillies, G. T.,
"High Speed Rotor Losses in a Radial 8-Pole Magnetic Bearing, Part I: Experimental Measurement,"
ASME Journal of Engineering for Gas Turbines and Power,
Vol. 120, No. 1, January 1998, pp. 105-109.
- Hilton, E. F.; Allaire, P. E.; Baloh, M. J.; Maslen, E. H.; Bearnson, G. B.; Khanwilkar, P. M.; Olsen, D. B.,
"Magnetic Suspension Controls for a New Continuous Flow Ventricular Assist Device,"
ASAIO Journal, Vol. 43, No. 5, pp. M598-M603, 1997.
- Baun, D. O., Fittro, R. L., and Maslen, E. H.,
"Force versus Current and Air Gap Calibration of a Double Acting Magnetic Thrust Bearing,"
ASME Journal of Engineering for Gas Turbines and Power, Vol. 119, No. 4,
October 1997, pp. 942-948
- Srinivasan, S., Maslen, E., and Barrett, L.,
"A Method for Determining Optimum Bearing Locations for Rotor-Bearing Systems,"
Journal of Engineering for Gas Turbines and Power, v. 119 (Apr. '97) p.
464-8.
- Noh, M. D., and Maslen, E. H.,
"Self Sensing Active Magnetic Bearings Based on Parameter Estimation,"
IEEE Transactions on Instrumentation and Measurement, 46(1):45-50, 1997 Feb.
- Allaire, P.E., Maslen, E. H., and Lewis, D. W.,
"Magnetic Thrust Bearing Operation and Industrial Pump Application,"
Journal of Engineering for Gas Turbines and Power, v. 119 (Jan. '97) pp. 168-73.
- Allaire, P. E., Fittro, R. L., Maslen, E. H., and Wakefield, W. C.,
"Measured Force/Current Relations in Solid Magnetic Thrust Bearings,"
ASME Journal of Engineering for Gas Turbines and Power,
Vol. 119, No. 1, January 1997.
- Bearnson GB. Olsen DB. Khanwilkar PS. Long JW. Allaire PE. Maslen EH.
"Pulsatile Operation of a Centrifugal Ventricular Assist Device with Magnetic Bearings,"
ASAIO Journal. 42(5):M 620-M 624, 1996 Sep-Oct.
- Maslen, E. H., Allaire, P. E., Noh, M., and Sortore, C. K.,
"Magnetic Bearing Design for Reduced Power Consumption,"
ASME Journal of Tribology, Vol. 118, No. 4, October 1996,
pp. 839-846.
- Allaire, P. E., Maslen, E. H., Kim, H. C., Bearnson, G. B., and Olsen, D. B.,
"Design of a Magnetic Bearing Supported Prototype Centrifugal Artificial Heart Pump,"
STLE Tribology Transactions,
Vol. 39, No. 3, July 1996, pp. 663-669.
- Meeker, D. C., Maslen, E. H., and Noh, M. D.,
"An Augmented Circuit Model for Magnetic Bearings Including Eddy Currents, Fringing, and Leakage,"
IEEE Transactions on Magnetics, Vol. 32, No. 4, July 1996,
pp. 3219-3227.
- Allaire, P. E., Kim, H. C., Maslen, E. H., Olsen, D. B., and Bearnson, G. B.,
"Prototype Continuous Flow Ventricular Assist Device Supported on Magnetic Bearings,"
Artificial Organs,
July 1996, 20(6), pp. 582-590.
- Bearnson, G. B., Maslen, E. H., Olsen, D. B., Allaire, P. E., Khanwilkar, P. S., Long, J. W., and Kim, H. C.,
"Development of a Prototype Magnetically Suspended Rotor Ventricular Assist Device,"
Journal of the American Society for Artificial Internal Organs,
Vol. 42, No. 2, July 1996, pp. 275-281.
- Khanwilkar, P., Olsen, D., Bearnson, G., Allaire, P., Maslen, E., Flack, R. and Long, J.,
"Using Hybrid Magnetic Bearings to Completely Suspend the Impeller of a Ventricular Assist Device,"
Artificial Organs,
20(6):597-604, 1996 Jun.
- Meeker, D. C., Maslen, E. H., Ritter, R. C, and Creighton, F. M.,
"Optimal Realization of Arbitrary Forces in a Magnetic Stereotaxis System",
IEEE Transactions on Magnetics, Vol. 32, No. 2, March 1996, pp. 320-328.
- Maslen, E. H., and Barrett, L. E., "Rotor Whirl in Compliant
Auxiliary Bearings," Journal of Vibration and Control, 2: 1996, pp. 145-159.
- Maslen, E. H., "Positive Real Zeros in
Flexible Beams," Journal of Shock and Vibration,
Vol. 2, No. 6, 1995, pp. 429-435.
- Maslen, E. H., and Meeker, D. C., "Fault
Tolerance of Magnetic Bearings by Generalized Bias Current
Linearization,"
IEEE Transactions on Magnetics, Vol. 31, No. 3,
May 1995, pp. 2304-2314.
- Maslen, E. H., and Allaire, P. E., "Active Bearing
Load Capacity Requirements for Rotating Shafts," Proceedings of the
Institution of Mechanical Engineers, IMechE 1992, Vol. 6,
pp. 91-98.
- Maslen, E. H., and Allaire, P. E., "Magnetic Bearing
Sizing for Flexible Rotors," ASME Journal of Tribology,
vol. 114, no. 2, April 1992, pp. 223-229.
- Maslen, E. H., and Bielk, J. R., "A Stability Model for Flexible Rotors
with Magnetic Bearings," ASME Journal of Dynamic Systems, Measurement, and
Control, Vol. 114, No.1, March, 1992, pp. 172-175.
- Maslen, E. H. and Townsend, M. A., "Stability Limits of Linear Feedback
Control Systems," ASME Journal of Dynamic Systems, Measurement and Control,
vol. 111, no. 2, June 1989, pp. 138-141.
- Maslen, E. H., Hermann, P., Scott, M. A., and Humphris, R. R., "Practical
Limits to the Performance of Magnetic Bearings: Peak Force, Slew Rate, and
Displacement Sensitivity," ASME Journal of Tribology, vol. 111, no. 2,
April 1989, pp. 331-336.
- Apparatus and Method for Minimizing Occupant Injury during Passenger Vehicle Crash Events
- Provisional United States Patent 61/050,837
Date of Filing: May 6, 2008
Inventors: Bose, Dipan; Crandall, Jeff; Maslen, Eric; Untaroiu, Costin.
Assignee: University of Virginia Patent Foundation (Charlottesville, VA).
- Hybrid Magnetically Suspended and Rotated Centrifugal Pumping Apparatus and Method
- United States Patent Number 6,595,762 B2
Date of Patent: July 22, 2003
Inventors: Khanwilkar, Pratap S.;
Allaire, Paul E.; Bearnson, Gill Brent;
Olsen, Don B.; Maslen, Eric H.; Long, James W.
Assignees: Medquest Products, Inc. (Salt Lake City, UT);
University of Virginia Patent Foundation (Charlottesville, VA).
- Electromagnetically suspended and rotated centrifugal pumping apparatus and method
- United States Patent Number 6,302,661
Date of Patent: October 16, 2001
Inventors: Khanwilkar, Pratap S.;
Allaire, Paul E.; Bearnson, Gill Brent;
Olsen, Don B.; Maslen, Eric H.; Long, James W.
Assignees: Medquest Products, Inc. (Salt Lake City, UT);
University of Utah Research Foundation (Salt Lake City, UT);
University of Virginia Patent Foundation (Charlottesville, VA).
- Hybrid magnetically suspended and rotated centrifugal pumping apparatus and method
- United States Patent Number 6,074,180
Date of Patent: June 13, 2000
Inventors: Khanwilkar; Pratap S. (Salt Lake City, UT);
Allaire; Paul E. (Charlottesville, VA);
Bearnson; Gill Brent (Salt Lake City, UT);
Olsen; Don B. (Salt Lake City, UT);
Maslen; Eric H. (Earlysville, VA); Long; James W. (Salt Lake City,
UT).
Assignees: Medquest Products, Inc. (Salt Lake City, UT);
University of Utah Research Foundation (Salt Lake City, UT);
University of Virginia Patent Foundation (Charlottesville, VA).
- Magnetic bearings for pumps, compressors and other rotating machinery
- United States Patent No. 5,355,042
Date of Patent: Nov. 13, 1990
Inventors: Lewis; David W.; Humphris; Robert R.; Maslen; Eric H.; Allaire; Paul E.;
Williams; Ronald D.
Assignee: University of Virginia Patent Foundation (Charlottesville, VA).
- Magnetic bearing systems
- United States Patent No. 5,347,190
Date of Patent: Sept. 13, 1994
Inventors: Lewis; David W.; Humphris; Robert R.; Maslen; Eric H.; Allaire; Paul E.;
Williams; Ronald D.; Yates; Steven W.
Assignee: University of Virginia Patent Foundation (Charlottesville, VA).
- Minimum pulse width switching power amplifier
- United States Patent No. 5,077,540
Date of Patent: Dec. 31, 1991
Inventors: Keith; F. Joseph; Maslen; Eric H.
Assignee: University of Virginia Patents Foundation (Charlottesville, VA).
Present Students
- Trevor Wesolowski: Master of Science expected May 2010
- Daniel Wilkerson: Docter of Philosophy, expected May 2014
Previous students
- Vincenzo S. Lefante: Master of Science, January 1992, now with
Parker Hannifin Aerospace in Irvine, CA.
- Daniel R. Maurer: Master of Science, August 1992, now with Kodak
Corp., Rochester, NY.
- F. Joseph Keith: (co-advised with Ronald D. Williams) Doctor of Philosophy, May 1993, now
with Atlanta Bonded Warehouse, Atlanta, GA.
- Matthew J. Stewart: Master of Science, August 1993, now with
DRS Technologies, Fitchburg, MA.
- Sriram Srinivasan: (co-advised with Lloyd Barrett) Doctor of Philosophy, August 1993,
now with Carrier Corp., Syracuse, NY.
- David C. Meeker: Doctor of
Philosophy, May 1996. Now with Foster-Miller, Inc., Boston, MA.
Dissertation: Optimal Solutions to the Inverse Problem in
Quadratic Magnetic Actuators.
- Myounggyu D. Noh: Doctor of Philosophy, January 1996, now on the faculty of
Chungnam National University , Taejun, Korea.
Dissertation: Self-Sensing Magnetic Bearings Driven
by a Switching Power Amplifier.
- Christopher K. Sortore:
Doctor of Philosophy, January 1999, now with Synchrony, Inc.
Dissertation: Critical Response Estimation in Rotating
Machinery.
- Yong Teng:
(co-advised with Susan Carlson-Skalak)
Doctor of Philosophy, January 1999, now with SolidWorks.
- Alexei Filatov: Doctor of
Philosophy, August, 2002, now with Calnetix, Inc. Dissertation:
Null-E Magnetic Bearings.
- Dominick Montie:
(coadvised with Tetsuya Iwasaki)
Doctor of Philosophy, January, 2003.
Dissertation: Performance Limitations and
Self--Sensing Magnetic Bearings.
- Tommy Bernal: Master of
Engineering, August, 2004, now with Allied Aerospace, Newport News, VA
- Nathan Brown: Master of
Science, January, 2005, now with Luna Innovations, Inc., Charlottesville, VA
- Dorsa Sanadgol: Doctor of Philosophy, August 2006, now on the
faculty of Sweet Briar College. Dissertation:
Active Control of Surge in Centrifugal Compressors using Magnetic Tip Actuation
- Roza Mahmoodian: Master of Science, January 2007, now at Drexel University, Philadelphia, PA.7
- Eric Buskirk: Master of
Science, August 2007, now with General Electric.
- Hunter Cloud: Doctor of
Philosophy, May 2007 (co-advised with Lloyd Barrett) now with BRG Machinery Consulting, LLC..
Dissertation: Stability of rotors supported by tilting
pad journal bearings
- Qingyu Wang: Doctor of
Philosophy, August 2008
- Nick Elder: Master of Science, May 2008
Eric Maslen earned his Bachelor of Science in mechanical engineering from Cornell University in
1980. Subsequently, he worked for five years for the Koppers Company as a research and development
engineer with time off for a stint in the United States Peace Corps. He was awarded his doctorate
in mechanical and aerospace engineering from the University of Virginia in 1990 and immediately
joined the faculty at the same university. He was promoted to Professor in 2003. His research focus
since his doctoral studies has been in controls, magnetics, and rotating machine dynamics with
special application to magnetic bearings. Professor Maslen has been a member of the
ISO TC108/SC2/WG7 committee for magnetic bearing standards since 1998. He has been a visiting
professor at the Technical University of Vienna (1995), the Technical University of Darmstadt
(2001), the University of California at Berkeley (2002), and Shandong University (2007 and 2008).