Eric H. Maslen

Office: 314 MEC Building
Phone: 434-924-6227
Fax: 434-982-2037
E-mail: ehm7s@virginia.edu

Education

• PhD, 1990, University of Virginia, Mechanical and Aerospace Engineering, "Magnetic Bearing Synthesis for Rotating Machinery"
• BS, 1980, Cornell University, Mechanical Engineering

Experience

• 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

Research Projects & Areas of Interest

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

Teaching Activities

• 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

Books

2. Schweitzer, G. and Maslen, E. (Eds.), "Magnetic Bearings Theory, Design, and Application to Rotating Machinery," Springer, 2009
1. 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

51. 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.
50. 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.
49. 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.
48. 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.
47. 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.
46. 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.
45. 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.
44. 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.
43. 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.
42. 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.
41. 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.
40. 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.
39. 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.
38. 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.
37. 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.
36. 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.
35. 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.
34. 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 .
33. 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.
32. 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.
31. 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.
30. 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.
29. 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.
28. 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.
27. 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.
26. 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.
25. 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.
24. 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.
23. 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.
22. 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.
21. 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
20. 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.
19. 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.
18. 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.
17. 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.
16. 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.
15. 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.
14. 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.
13. 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.
12. 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.
11. 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.
10. 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.
9. 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.
8. Maslen, E. H., and Barrett, L. E., "Rotor Whirl in Compliant Auxiliary Bearings," Journal of Vibration and Control, 2: 1996, pp. 145-159.
7. Maslen, E. H., "Positive Real Zeros in Flexible Beams," Journal of Shock and Vibration, Vol. 2, No. 6, 1995, pp. 429-435.
6. 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.
5. 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.
4. 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.
3. 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.
2. 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.
1. 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.

Patents

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).

Graduate Students

Present Students

1. Trevor Wesolowski: Master of Science expected May 2010
2. Daniel Wilkerson: Docter of Philosophy, expected May 2014

Previous students

1. Vincenzo S. Lefante: Master of Science, January 1992, now with Parker Hannifin Aerospace in Irvine, CA.
2. Daniel R. Maurer: Master of Science, August 1992, now with Kodak Corp., Rochester, NY.
3. F. Joseph Keith: (co-advised with Ronald D. Williams) Doctor of Philosophy, May 1993, now with Atlanta Bonded Warehouse, Atlanta, GA.
4. Matthew J. Stewart: Master of Science, August 1993, now with DRS Technologies, Fitchburg, MA.
5. Sriram Srinivasan: (co-advised with Lloyd Barrett) Doctor of Philosophy, August 1993, now with Carrier Corp., Syracuse, NY.
6. 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.
7. 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.
8. Christopher K. Sortore: Doctor of Philosophy, January 1999, now with Synchrony, Inc.
   Dissertation: Critical Response Estimation in Rotating Machinery.
9. Yong Teng: (co-advised with Susan Carlson-Skalak) Doctor of Philosophy, January 1999, now with SolidWorks.
10. Alexei Filatov: Doctor of Philosophy, August, 2002, now with Calnetix, Inc. Dissertation: Null-E Magnetic Bearings.
11. Dominick Montie: (coadvised with Tetsuya Iwasaki) Doctor of Philosophy, January, 2003. Dissertation: Performance Limitations and Self--Sensing Magnetic Bearings.
12. Tommy Bernal: Master of Engineering, August, 2004, now with Allied Aerospace, Newport News, VA
13. Nathan Brown: Master of Science, January, 2005, now with Luna Innovations, Inc., Charlottesville, VA
14. 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
15. Roza Mahmoodian: Master of Science, January 2007, now at Drexel University, Philadelphia, PA.7
16. Eric Buskirk: Master of Science, August 2007, now with General Electric.
17. 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
18. Qingyu Wang: Doctor of Philosophy, August 2008
19. Nick Elder: Master of Science, May 2008

Brief Biography Sketch