PUBLICATIONS & PATENTS

JAMES F. WALTON II

PUBLICATIONS:

1. Walton, J.F., II, Tomaszewski, M.J., Heshmat, C.S. and Heshmat, H. "On The Development Of An Oil-Free Electric Turbocharger For Fuel Cells," Paper GT2006-90796, presented at the International Gas Turbine Institute Turbo Expo Conference, Barcelona, Spain, May 2006.

2. Heshmat, H., Tomaszewski, M., and Walton J. F.,"Small Gas Turbine Engine Operating With High-Temperature Foil Bearings," Paper GT2006-90791, presented at the International Gas Turbine Institute Turbo Expo Conference, Barcelona, Spain, May 2006

3. Heshmat, H., Walton J. F., Tomaszewski, M., and Jahanmir, S., “Magnetically Suspended Rotary Blood Pump,” WTC2005-63681, Accepted for presentation at World Tribology Congress September 12-16, 2005, Washington, D. C.

4. Heshmat, H., Hryniewicz, P., Walton J. F. Willis, J.P., and Jahanmir, S., “Low-friction Wear Resistant Coatings for High-Temperature Foil Bearings,” WTC2005-63684, Accepted for presentation at World Tribology Congress September 12-16, 2005, Washington, D. C.

5. Heshmat, H., Tomaszewski, M., Heshmat, C., Walton J. F. and Jahanmir, S. “High-Temperature High-Speed Tribometer with Complex Motion,” WTC2005-63685 Accepted for presentation at World Tribology Congress September 12-16, 2005, Washington, D. C.

6. Heshmat, H., Walton J. F. and Tomaszewski, M., “Turbojet Engine Demonstration with a High Temperature Air Foil Bearing” WTC2005-63951, Accepted for presentation at World Tribology Congress September 12-16, 2005, Washington, D. C.

7. Heshmat, H., Walton J. F. and Tomaszewski, M., “Demonstration of a Turbojet Engine Using an Air Foil Bearing,”Paper GT2005-68404 presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Reno, NV June 6-9, 2005 Selected for ASME 2005 IGTI Vehicular & Small Turbomachines Committee Best Paper Award

8. Jahanmir S, Heshmat H, Tomaszewski M., Walton JF, Hunsberger AZ,Weiss WJ, Lukic B, Pae WE, Zapanta CM and Khalapyan TZ, “Status of Magnetically Suspended MiTiHeart LVAD,”, Presented at ASIAO Conference, Wasington, DC, June 2005

9. Salehi, M., Heshmat, H., Walton J. F., “Advancements In The Structural Stiffness and Damping Of A Large Compliant Foil Journal Bearing: An Experimental Study,” Paper GT2004-53860 presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Vienna, Austria June 2004, Accepted for Journal publication

10. Salehi, M., Heshmat, H., Walton J. F., “Operation of a Mesoscopic Gas Turbine Simulator at Speeds in Excess of 700,000 rpm on Foil Bearings,” Paper GT2004-53870 presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Vienna, Austria June 2004, accepted for journal publication.

11. Walton J. F.,Heshmat, H., and Tomaszewski, M., “Testing of a Small Turbocharger/Turbojet Sized Simulator Rotor Supported on Foil Bearings’” Paper GT2004-53647 presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Vienna, Austria June 2004

12. Jahanmir, S., Willis, J.P., Walton, J.F., II,, Heshmat, H., Weiss, W.J., Lukic, B., Pae, W.E., and Prophet, G.A., “In Vivo Performance of a Magnetically Suspended Rotary Blood Pump Prototype,” Presented at ASIAO 50th Anniversary Conference, Wasington, DC, June 17-19, 2004

13. Heshmat, Hooshang, Walton James F. II, Tomaszewski, Michael J., Cruzen, G. Scott and Rabe, Lavern, "A Turbojet Engine Demonstration with Air Foil Bearing," Presented at the UVS Tech 2003, Royal Military Academy, Brussels, Belgium, December 3-5, 2003

14. Salehi, M., Tomaszewski, Michael J., Walton James F. II, Heshmat, Hooshang, "A 700,000 rpm Feasibility Demonstration for Mesoscopic Scale Gas Turbine Engines," Presented at the UVS Tech 2003, Royal Military Academy, Brussels, Belgium, December 3-5, 2003

15. Walton, J.F, Tomaszewski, M.J., Heshmat, H., “The Role of High Performance Foil Bearings in Advanced, Oil-free, High-speed Motor Driven Compressors”, Fuel Cell Science, Engineering and Technology, ASME 2003, pp 411-418, FuelCell2003-1747, presented at 1st International Conference Fuel Cell Science, Engineering and Technology, April 21-23, 2003, Rochester, NY,

16. Salehi, M., Heshmat, H., Walton, J., 2002, “On the Frictional Damping Characterization of Compliant Bump Foils”, ASME Journal of Tribology, Vol. 125, No.4, pp. 804-813, presented at International Joint Tribology Conference 2002, Oct., Cancun, Mexico.

17. Swanson, E., Walton, J.F., Heshmat, H., "A Test Stand for Dynamic Characterization of Oil-Free Bearings for Modern Gas Turbine Engines," Paper 2002-GT-30005 presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Amsterdam, Netherlands June 2002

18. Locke, D., Swanson, E., Walton, J., Heshmat, H., "Testing of a Centrifugal Blood Pump with a High Efficiency Hybrid Magnetic Bearing," Presented at ASIAO 48th Annual Conference June 2002, New York, New York.

19. Heshmat, H., Walton,J.F., DellaCorte,C. and Valco,M.J., “Oil Free Turbocharger Demonstration Paves Way to Gas Turbine Engine Applications” Paper 2000-GT-0620, presented at ASME Turbo Expo, Land, Sea and Air, International Gas Turbine Conference, Munich, Germany, May 8-11, 2000.

20. Swanson, E., Heshmat, H., and Walton, J.F.,“Performance Of A Foil-Magnetic Hybrid Bearing,” ASME J. Engr for Gas Turbines and Power, April 2002, Vol. 124, No. 2, pp 375-382, presented at ASME Turbo Expo, Land, Sea and Air 2000, Paper 2000-GT-0411.

21. Swanson, E., Walton, J.F., and Heshmat, H., “A Gas Turbine Engine Backup Bearing Operating Beyond 2.5 Million DN,” Paper 2000-GT-0622, presented at ASME Turbo Expo, Land, Sea and Air, 2000 Conference, Munich, Germany, May 8-11, 2000.

22. Swanson, E., Xu, D., Russell, T., Walton, J.F., and Heshmat, H., “On the Application of Powder Shear Damping to a Structural Element,” Paper 2000-GT-0365, presented at ASME Turbo Expo, Land, Sea and Air, 2000 Conference, Munich, Germany, May 8-11, 2000.

23. Salehi, M., Heshmat, H., Walton, J., and Cruzen S., 1999, "The Application of Foil Seals to a Gas Turbine Engine", AIAA paper 99-2821, presented at the 35th AIAA/ASME/SAE/ASEE Joint Propulsion Conference& Exhibit, June 20-24, 1999 Los Angeles, CA.

24. Walton, J.F., “Auxiliary Bearings in Support of Magnetic Bearings for Turbine Engines,” SAE Paper 1999-01-1392, Published in Proceedings of the 1999 SAE Aerospace Power Systems Conference, P-341, pp. 179-185, April 6-9, 1999, Mesa AZ Awarded 1999 SAE Charles M. Manly Memorial Medal.

25. Walton, J.F. and Heshmat, H., “Application of Foil Bearings to Turbomachinery Including Vertical Operation,” Journal of Engineering for Gas Turbines and Power -- October 2002 -- Volume 124, Issue 4, pp. 1032-1041, Presented at ASME Turbo Expo, Land, Sea and Air, June 1999, Indianapolis, IN. ASME Paper 99-GT-391 Winner ASME 1999 IGTI Vehicular & Small Turbomachines Committee Best Paper Award

26. Swanson, E.E., Walton, J.F., and Heshmat, H., “A 35,000 rpm Test Rig for Magnetic, Hybrid and Back-up Bearings,” Paper 99-GT-180 Presented at Turbo Expo, Land, Sea and Air, 1999 Conference, Indianapolis, IN, June 1999.

27. Heshmat, H., Chen, H.M., and Walton, J. “On the Performance of Hybrid Foil-Magnetic Bearings,” ASME J. Engr for Gas Turbines and Power, January 2000, Vol. 122, No. 1, pp 73-81, Presented at the ASME International Gas Turbine & Aeroengine Congress and Exposition, 98-GT-376, Stockholm, Sweden, June 2-5, 1998.

28. Chen,H.M., Smith,W., & Walton, J.F., “A High Efficiency Magnetic Bearing for a Rotary Blood Pump,” Published in ASAIO J 44, No. 5, M728-M732, Sept-Oct 1998, and Presented at ASAIO 44th Annual Conference, April 23-25, 1998, New York, New York.

29. Chen, H.M., Walton, J. and Heshmat, H.,”Test of a Zero Clearance Auxiliary Bearing,” Proceedings of the MAG ‘97 Industrial Conference and Exhibition on Magnetic Bearings, August 21-22, 1997

30. Chen, H.M., Walton, J., and Heshmat, H., “Zero Clearance Auxiliary Bearings for Magnetic Bearing Systems,” International Gas Turbine & Aeroengine Congress and Exposition, 97-GT-112, June 2-5, 1997.

31. Chen,H.M., and Walton, J.F., “Novel Magnetic Bearings for Flywheel Energy Storage System,” Presented at ISROMAC-6, Honolulu, Feb 25, 1996.

32. Chen,H.M., and Walton, J.F. “Velocity-Controlled Magnetic Bearings with Solid Cores”, Proceedings of Third International Symposium on Magnetic Suspension Technology, Dec 13-15, 1995, pp781-792

33. Walton, J.F. and Heshmat, H. "Compliant Foil Bearings For Use In Cryogenic Turbopumps." Proceedings of Advanced Earth-to-Orbit Propulsion Technology Conference Held at NASA/MSFC May 17-19, 1994, NASA CP3282 Vol. 1, Sept. 19, 1994, pp. 372-381.

34. Ku, C-P.R., Walton, James F., and Lund, J.W., “Dynamic Coefficients of Axial Spline Couplings in High Speed Rotating Machinery,” ASME Journal of Vibration and Acoustics, Vol. 116, No. 3, July 1994, pp. 250-256.

35. Walton, James F., and Martin, Michael, "Internal Rotor Friction Induced Instability in High-Speed Rotating Machinery," Presented at 14th Biennial Conference on Mechanical Vibration and Noise, September 19-22, 1993, Albuquerque, New Mexico, DE-Vol. 60 Vibrations of Rotating Systems, pp 297-305

36. Walton, James F., Ku, C-P.R. and Lund, J.W., "An Experimental Investigation of the Dynamic Characteristics of an Axial Spline Coupling in High-Speed Rotating Machinery," Presented at 14th Biennial Conference on Mechanical Vibration and Noise, September 19-22, 1993, Albuquerque, New Mexico, DE-Vol. 60 Vibrations of Rotating Systems, pp 265-270.

37. Ku, C-P.R., Walton, James F., and Lund, J.W., "A Theoretical Approach to Determine Angular Stiffness and Damping Coefficients of an Axial Spline Coupling in High-Speed Rotating Machinery," Presented at 14th Biennial Conference on Mechanical Vibration and Noise, September 19-22, 1993, Albuquerque, New Mexico, DE-Vol. 60 Vibrations of Rotating Systems, pp249-256.

38. Ku, C-P.R., Walton, James F., and Lund, J.W., "An Investigation of Angular Stiffness and Damping Coefficients of an Axial Spline Coupling in High-Speed Rotating Machinery," Presented at 7th Workshop on Rotordynamic Instability Problems in High Performance Turbomachinery, May 10-12, 1993, College Station, Texas.

39. Heshmat, H. and Walton, J.F., "The Basics of Powder Lubrication in High-Temperature Powder Lubricated Dampers," ASME Journal of Engineering for Gas Turbines and Power, Vol. 115, No. 2, April 1993, pp 372-382.
40. Tecza, J.A. and Walton, J.F., "A Chambered Porous Damper for Rotor Vibration Control: Part I - Concept Development," ASME Journal of Engineering for Gas Turbines and Power, Vol. 115, No. 2, April 1993, pp 360-365.

41. Walton, J.F., and Martin, M., "A Chambered Porous Damper for Rotor Vibration Control: Part II - Imbalance Response and Bladeloss Simulation," ASME Journal of Engineering for Gas Turbines and Power, Vol. 115, No. 2, April 1993, pp 366-371.

42. Walton, J.F. and Heshmat, H., "Rotordynamic Evaluation of an Advanced Multi-Squeeze Film Damper - Imbalance Response and Bladeloss Simulation," ASME Journal of Engineering for Gas Turbines and Power, Vol. 115, No. 2, April 1993, pp 347-352.

43. Heshmat, H. and Walton, J.F., "High Temperature Powder Lubricated Dampers for Gas Turbine Engines," AIAA Journal of Propulsion and Power, Vol. 8, No. 2, March-April 1992, pp 449-456.

44. Walton, J.F., Cronin, M., and Mehta, R., "Advanced Balancing Using Laser Machining," Presented at 1991 SAE Aerotech Exposition and Congress, September 23-26, 1991, Long Beach, CA, Paper No. 912218.
45. Walton, J.F., Heshmat, H., and Storace, A., Advanced Rotordynamics Program: High Load Dampers - Final Report, WL-TR-91-2038, July 31, 1991.

46. Heshmat, H., and Walton, J.F., "Advanced Multi-Squeeze Film Dampers for Rotor Vibration Control," ASME/STLE Tribology Conference, Paper No. 90-TC-3E-1, October 8-10, 1990.

47. Walton, J.F., Lund, J., et.al, “Internal Rotor Friction Instability,” NASA CR-183942, 1990.

48. Walton, J.F., et.al.,"Internal Friction Instability in the SSME Turbopump," Proceedings 1990 Advanced Earth-to-Orbit Propulsion Technology Conference, NASA-CP-3092, Vol.II, pp 220-232, May 15-17, 1990.

49. Walton, J. And Martin, M., “High Speed Balancing Applied to the T700 Engine,” AVSCOM-TR-88-C-007, Final Report, 1990.

50. Walton, J.F., et.al, "Experimental Investigation of Internal Friction Instability," Proceedings Advanced Earth-to-Orbit Propulsion Technology, NASA-CP-3012 Vol. II, pp 165-191, May 10-12, 1988.

51. Walton, J.F., Walowit, J., Zorzi, E. And Schrand, J., "Experimental Observation of Cavitating Squeeze Film Dampers," ASME Journal of Tribology, Vol. 109, No. 2, pp 290-295, April, 1987.

52. Walton, J.F., et.al Squeeze Film Damper Technology Parts II, III and IV- Final Report, AFWAL-TR-82-2112, September 1986

53. Walton, J.F., at.al. "The Effects of Internal Rotor Friction on Dynamic Characteristics of Turbopumps," Proceedings Advanced Earth-to-Orbit Propulsion Technology, NASA-CP-2437 Vol. II, pp 33-61, May 13-15, 1986.

54. Walton, J.F., Zorzi, E. And Cunningham, R., "Power Turbine Dynamics - An Evaluation of a Shear Mounted Elastomeric Damper," ASME International Gas Turbine and Aeroengine Congress and Exposition, Paper No. 83-GT-228.

55. Lund, J. W., Smalley, A.J., Tecza, J.A., and Walton, J.F., "Squeeze Film Damper Technology: Part I - Prediction of Finite Length Damper Performance," ASME International Gas Turbine and Aeroengine Congress and Exposition, Paper No. 83-GT-247.

PATENTS:

5,149,936 Multi-plane Balancing Process and Apparatus Using Powder Metal for Controlled Material Addition - Sept. 1992

6,191,513 Stator Controlled Magnetic Bearing - Feb. 2001

6,353,273 Hybrid Foil Magnetic Bearing - Mar. 2002

6,770,993 Hybrid Foil Magnetic Bearing with Improved Load Sharing - Aug. 2004

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