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James F. Walton
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Proceedings Papers

A Theoretical Approach to Determine Angular Stiffness and Damping Coefficients of an Axial Spline Coupling in High-Speed Rotating Machinery

C.-P. Roger Ku, James F. Walton, Jr., Jorgen W. Lund
Proc. ASME. DETC93, 14th Biennial Conference on Mechanical Vibration and Noise: Vibration of Rotating Systems, 249-256, September 19–22, 1993
Publisher: American Society of Mechanical Engineers
Paper No: DETC1993-0199
https://doi.org/10.1115/DETC1993-0199
View Paper titled, A Theoretical Approach to Determine Angular Stiffness and Damping Coefficients of an Axial Spline Coupling in High-Speed Rotating Machinery
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Topics: Damping, Machinery, Splines, Stiffness, Computer software, Deflection, Rotordynamics, Sensitivity analysis, Turbomachinery
Proceedings Papers

Internal Rotor Friction Induced Instability in High-Speed Rotating Machinery

James F. Walton, Jr., Michael R. Martin
Proc. ASME. DETC93, 14th Biennial Conference on Mechanical Vibration and Noise: Vibration of Rotating Systems, 297-305, September 19–22, 1993
Publisher: American Society of Mechanical Engineers
Paper No: DETC1993-0205
https://doi.org/10.1115/DETC1993-0205
View Paper titled, Internal Rotor Friction Induced Instability in High-Speed Rotating Machinery
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Topics: Friction, Machinery, Rotors, Vibration, Press fits, Splines, Stress, Testing
Proceedings Papers

An Experimental Investigation of the Dynamic Characteristics of an Axial Spline Coupling in High-Speed Rotating Machinery

James F. Walton, Jr., C.-P. Roger Ku, Jorgen W. Lund
Proc. ASME. DETC93, 14th Biennial Conference on Mechanical Vibration and Noise: Vibration of Rotating Systems, 265-270, September 19–22, 1993
Publisher: American Society of Mechanical Engineers
Paper No: DETC1993-0201
https://doi.org/10.1115/DETC1993-0201
View Paper titled, An Experimental Investigation of the Dynamic Characteristics of an Axial Spline Coupling in High-Speed Rotating Machinery
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Topics: Machinery, Splines, Damping, Stiffness, Couplings, Deflection, Friction, Rotordynamics, Rotors, Stability
Proceedings Papers

On the Integration of Hot Foil Bearings Into Gas Turbine Engines: Theoretical Treatment

Hooshang Heshmat, James F. Walton, II
Proc. ASME. GT2019, Volume 7B: Structures and Dynamics, V07BT34A036, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91710
https://doi.org/10.1115/GT2019-91710
View Paper titled, On the Integration of Hot Foil Bearings Into Gas Turbine Engines: Theoretical Treatment
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Topics: Foil bearings, Gas turbines, Bearings, Stiffness, Design, High temperature, Modeling, Rotors, System dynamics, Damping
Proceedings Papers

Ultra-High Temperature Compliant Foil Bearings: The Journey to 870°C and Application in Gas Turbine Engines — Experiment

Hooshang Heshmat, James F. Walton, II, Brian D. Nicholson
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A016, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75555
https://doi.org/10.1115/GT2018-75555
View Paper titled, Ultra-High Temperature Compliant Foil Bearings: The Journey to 870°C and Application in Gas Turbine Engines — Experiment
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Topics: Foil bearings, Gas turbines, Temperature, Bearings, Ceramics, High temperature, Testing, Turbochargers, Air Force, Automotive engines
Proceedings Papers

A Bladeless Turbocompressor Concept: Shear Driven Gas Compression With Deformable Structures: Part 1 — Experimental Proof of Concept

Hooshang Heshmat, James F. Walton, II
Proc. ASME. POWER2017-ICOPE-17, Volume 1: Boilers and Heat Recovery Steam Generator; Combustion Turbines; Energy Water Sustainability; Fuels, Combustion and Material Handling; Heat Exchangers, Condensers, Cooling Systems, and Balance-of-Plant, V001T02A005, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: POWER-ICOPE2017-3374
https://doi.org/10.1115/POWER-ICOPE2017-3374
View Paper titled, A Bladeless Turbocompressor Concept: Shear Driven Gas Compression With Deformable Structures: Part 1 — Experimental Proof of Concept
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Topics: Compression, Shear (Mechanics), Pressure, Foil bearings, Shear flow, Combined heat and power, Compressors, Disks, Flow (Dynamics), Geometry
Proceedings Papers

Design of a Partial Admission Turbine for an Organic Rankine Cycle With Environmental Fluctuation Consideration

Hooshang Heshmat, Andrew Hunsberger, James F. Walton, II
Proc. ASME. POWER2016, ASME 2016 Power Conference, V001T08A012, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: POWER2016-59386
https://doi.org/10.1115/POWER2016-59386
View Paper titled, Design of a Partial Admission Turbine for an Organic Rankine Cycle With Environmental Fluctuation Consideration
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Topics: Design, Organic Rankine cycle, Turbines, Rotors, Bearings, Contamination, Dynamics (Mechanics), Engineering prototypes, Fluids, Foil bearings
Proceedings Papers

Lubricant Free Foil Bearings Pave Way to Highly Efficient and Reliable Flywheel Energy Storage System

Hooshang Heshmat, James F. Walton, II
Proc. ASME. ES2016, Volume 1: Biofuels, Hydrogen, Syngas, and Alternate Fuels; CHP and Hybrid Power and Energy Systems; Concentrating Solar Power; Energy Storage; Environmental, Economic, and Policy Considerations of Advanced Energy Systems; Geothermal, Ocean, and Emerging Energy Technologies; Photovoltaics; Posters; Solar Chemistry; Sustainable Building Energy Systems; Sustainable Infrastructure and Transportation; Thermodynamic Analysis of Energy Systems; Wind Energy Systems and Technologies, V001T05A006, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ES2016-59350
https://doi.org/10.1115/ES2016-59350
View Paper titled, Lubricant Free Foil Bearings Pave Way to Highly Efficient and Reliable Flywheel Energy Storage System
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Topics: Energy storage, Flywheels, Foil bearings, Lubricants, Bearings, Rotors, Design, Levitation, Magnetic bearings, Mean free path
Journal Articles

Starved Hydrodynamic Gas Foil Bearings—Experiment, Micromechanical Phenomenon, and Hypotheses

Hooshang Heshmat, James F. Walton, II
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2016, 138(4): 041703.
Paper No: TRIB-15-1235
https://doi.org/10.1115/1.4032911
Published Online: July 20, 2016
View Article titled, Starved Hydrodynamic Gas Foil Bearings—Experiment, Micromechanical Phenomenon, and Hypotheses
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Topics: Bearings, Foil bearings, Particulate matter, Pressure, Viscosity, Stress, Lubrication, Fluids
Proceedings Papers

High Effectiveness, Low Pressure Drop Recuperator for High Speed and Power Oil-Free Turbogenerator

José Luis Córdova, James F. Walton, II, Hooshang Heshmat
Proc. ASME. GT2015, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T23A025, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43718
https://doi.org/10.1115/GT2015-43718
View Paper titled, High Effectiveness, Low Pressure Drop Recuperator for High Speed and Power Oil-Free Turbogenerator
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Topics: Additive manufacturing, Bearings, Ceramics, Combustion chambers, Compressors, Cycles, Engineering prototypes, Engines, Flow (Dynamics), Gas turbines
Proceedings Papers

Debris Tolerant Compliant Foil Bearings for High-Speed Turbomachines

Andrew Hunsberger, James F. Walton, II, Hooshang Heshmat
Proc. ASME. GT2015, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T23A024, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43712
https://doi.org/10.1115/GT2015-43712
View Paper titled, Debris Tolerant Compliant Foil Bearings for High-Speed Turbomachines
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Topics: Foil bearings, Turbomachinery, Testing, Bearings, Dust, Temperature, Failure, Cantilevers, Coating processes, Coatings
Proceedings Papers

The Basics of Powder Lubrication in High-Temperature Powder-Lubricated Dampers

Hooshang Heshmat, James F. Walton
Proc. ASME. GT1991, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, V005T14A040, June 3–6, 1991
Publisher: American Society of Mechanical Engineers
Paper No: 91-GT-248
https://doi.org/10.1115/91-GT-248
View Paper titled, The Basics of Powder Lubrication in High-Temperature Powder-Lubricated Dampers
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Topics: Dampers, High temperature, Lubrication, Design, Aircraft, Bearings, Flow (Dynamics), Fluid film lubrication, Gas turbines, Industrial lubrication systems
Proceedings Papers

On the Performance of Hybrid Foil-Magnetic Bearings

Hooshang Heshmat, H. Ming Chen, James F. Walton, II
Proc. ASME. GT1998, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, V005T14A027, June 2–5, 1998
Publisher: American Society of Mechanical Engineers
Paper No: 98-GT-376
https://doi.org/10.1115/98-GT-376
View Paper titled, On the Performance of Hybrid Foil-Magnetic Bearings
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Topics: Bearings, Foil bearings, Magnetic bearings, Journal bearings, Design, Load bearing capacity, Compliance, Control algorithms, Control systems, Elasticity
Proceedings Papers

Application of Foil Bearings to Turbomachinery Including Vertical Operation

James F. Walton, II, Hooshang Heshmat
Proc. ASME. GT1999, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T04A004, June 7–10, 1999
Publisher: American Society of Mechanical Engineers
Paper No: 99-GT-391
https://doi.org/10.1115/99-GT-391
View Paper titled, Application of Foil Bearings to Turbomachinery Including Vertical Operation
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Topics: Foil bearings, Turbomachinery, Bearings, Machinery, Journal bearings, Aircraft, Cryogenics, Cycles, Design, Gas turbines
Proceedings Papers

A 35,000 RPM Test Rig for Magnetic, Hybrid and Back-Up Bearings

Erik E. Swanson, James F. Walton, II, Hooshang Heshmat
Proc. ASME. GT1999, Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, V004T03A019, June 7–10, 1999
Publisher: American Society of Mechanical Engineers
Paper No: 99-GT-180
https://doi.org/10.1115/99-GT-180
View Paper titled, A 35,000 RPM Test Rig for Magnetic, Hybrid and Back-Up Bearings
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Topics: Bearings, Magnetic bearings, Damage, Failure, Knudsen number, Machinery, Stress, Turbomachinery
Proceedings Papers

Oil Free 8 kW High-Speed and High Specific Power Turbogenerator

Hooshang Heshmat, James F. Walton, II, Andrew Hunsberger
Proc. ASME. GT2014, Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V01BT24A023, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-27306
https://doi.org/10.1115/GT2014-27306
View Paper titled, Oil Free 8 kW High-Speed and High Specific Power Turbogenerator
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Topics: Bearings, Compressors, Cycles, Design, Foil bearings, Fuels, Gas turbines, Operating temperature, Permanent magnets, Rotors
Proceedings Papers

Oil-Free Turbocharger Demonstration Paves Way to Gas Turbine Engine Applications

Hooshang Heshmat, James F. Walton, II, Christopher Della Corte, Mark Valco
Proc. ASME. GT2000, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T04A008, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0620
https://doi.org/10.1115/2000-GT-0620
View Paper titled, Oil-Free Turbocharger Demonstration Paves Way to Gas Turbine Engine Applications
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Topics: Gas turbines, Turbochargers, Bearings, Foil bearings, Rotors, Lubricants, Stress, Temperature, Air bearings, Coating processes
Proceedings Papers

A Gas Turbine Engine Backup Bearing Operating Beyond 2.5 Million DN

Erik Swanson, James F. Walton, II, Hooshang Heshmat
Proc. ASME. GT2000, Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, V001T04A010, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0622
https://doi.org/10.1115/2000-GT-0622
View Paper titled, A Gas Turbine Engine Backup Bearing Operating Beyond 2.5 Million DN
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Topics: Bearings, Gas turbines, Magnetic bearings, Failure, Rotors, Ball bearings, Clearances (Engineering), Durability, Dynamics (Mechanics), Engines
Proceedings Papers

Power Loss in High-Speed Micro Turbomachinery: An Experimental Study

James F. Walton, II, Hooshang Heshmat, Michael Tomaszewski
Proc. ASME. GT2012, Volume 5: Manufacturing Materials and Metallurgy; Marine; Microturbines and Small Turbomachinery; Supercritical CO2 Power Cycles, 871-880, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-69558
https://doi.org/10.1115/GT2012-69558
View Paper titled, Power Loss in High-Speed Micro Turbomachinery: An Experimental Study
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Topics: Turbomachinery, Rotors, Bearings, Foil bearings, Motors, Pressure, Surface roughness, Clearances (Engineering), Film thickness, Generators
Proceedings Papers

Evaluation of a New Coating for Application to Ramjet Engine Combustion Chamber

Hooshang Heshmat, James F. Walton, III, Said Jahanmir
Proc. ASME. GT2012, Volume 5: Manufacturing Materials and Metallurgy; Marine; Microturbines and Small Turbomachinery; Supercritical CO2 Power Cycles, 641-649, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68725
https://doi.org/10.1115/GT2012-68725
View Paper titled, Evaluation of a New Coating for Application to Ramjet Engine Combustion Chamber
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Topics: Coating processes, Coatings, Combustion chambers, Engines, Ramjets, Temperature, Testing, Adhesion, Delamination, Alloys