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Journal Articles

Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability In Hydrostatic Thrust Bearings: Analysis And Experimental Validation

Accepted Manuscript
Homin Lim, Kyuman Kim, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1601
https://doi.org/10.1115/1.4066780
Published Online: October 4, 2024
View Article titled, Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability In Hydrostatic Thrust Bearings: Analysis And Experimental Validation
Open the PDF for Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability In Hydrostatic Thrust Bearings: Analysis And Experimental Validation in another window
Topics: Hammers, Hydrostatics, Thrust bearings, Bearings, Stress, Design, Stiffness, Damping, Fluids, Friction
Journal Articles

Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen

Accepted Manuscript
Chaeyeon Baek, Hyunsung Jung, Junwon Heo, Kyuman Kim, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1603
https://doi.org/10.1115/1.4066781
Published Online: October 4, 2024
View Article titled, Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen
Open the PDF for Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen in another window
Topics: Design, Hydrostatics, Journal bearings, Lasers, Nitrogen, Stress, Testing, Turbomachinery, Water, Bearings
Journal Articles

Dynamic Response of a Rotor Supported On Hybrid Bearings in Air, Water, and Liquid Nitrogen: Measurements and Comparisons to Predictions

Accepted Manuscript
Howon Yi, Kyuman Kim, Hyunsung Jung, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1501
https://doi.org/10.1115/1.4066539
Published Online: September 13, 2024
View Article titled, Dynamic Response of a Rotor Supported On Hybrid Bearings in Air, Water, and Liquid Nitrogen: Measurements and Comparisons to Predictions
Open the PDF for Dynamic Response of a Rotor Supported On Hybrid Bearings in Air, Water, and Liquid Nitrogen: Measurements and Comparisons to Predictions in another window
Topics: Bearings, Dynamic response, Nitrogen, Rotors, Water, Fluids, Rocket engines, Fluid films, Bearing design, Databases
Proceedings Papers

Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen

Chaeyeon Baek, Hyunsung Jung, Junwon Heo, Kyuman Kim, Keun Ryu
Proc. ASME. GT2024, Volume 10A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing, V10AT22A029, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-129557
https://doi.org/10.1115/GT2024-129557
View Paper titled, Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen
Open the PDF for Laser Powder Bed Fusion Manufactured Hydrostatic Journal Bearings for Turbomachinery: Design and Measurements of Static Load Testing With Air, Water, and Liquid Nitrogen in another window
Topics: Bearings, Design, Hydrostatics, Journal bearings, Lasers, Manufacturing, Nitrogen, Stress, Testing, Turbomachinery
Proceedings Papers

Dynamic Response of a Rotor Supported on Hybrid Bearings in Air, Water, and Liquid Nitrogen: Measurements and Comparisons to Predictions

Howon Yi, Kyuman Kim, Hyunsung Jung, Keun Ryu
Proc. ASME. GT2024, Volume 10A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing, V10AT22A028, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-129423
https://doi.org/10.1115/GT2024-129423
View Paper titled, Dynamic Response of a Rotor Supported on Hybrid Bearings in Air, Water, and Liquid Nitrogen: Measurements and Comparisons to Predictions
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Topics: Bearings, Dynamic response, Hydrostatics, Journal bearings, Nitrogen, Rotors, Water
Proceedings Papers

On the Predicted Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Journal Bearings Using Compressible Fluid and Comparisons With Test Data

Hyunsung Jung, Kyuman Kim, Keun Ryu
Proc. ASME. GT2024, Volume 10A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing, V10AT22A027, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-129343
https://doi.org/10.1115/GT2024-129343
View Paper titled, On the Predicted Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Journal Bearings Using Compressible Fluid and Comparisons With Test Data
Open the PDF for On the Predicted Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Journal Bearings Using Compressible Fluid and Comparisons With Test Data in another window
Topics: Bearings, Fluids, Hammers, Hydrostatics, Journal bearings
Proceedings Papers

Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Thrust Bearings: Analysis and Experimental Validation

Homin Lim, Kyuman Kim, Keun Ryu
Proc. ASME. GT2024, Volume 10A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing, V10AT22A020, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128181
https://doi.org/10.1115/GT2024-128181
View Paper titled, Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Thrust Bearings: Analysis and Experimental Validation
Open the PDF for Effects of Recess Depth and Orifice Diameter on Pneumatic Hammer Instability in Hydrostatic Thrust Bearings: Analysis and Experimental Validation in another window
Topics: Bearings, Hammers, Hydrostatics, Thrust bearings
Journal Articles

On the Performance of Hydrostatic Journal Bearings in Air, Water, and Liquid Nitrogen: Measurements and Predictions

Hyunsung Jung, Kyuman Kim, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2023, 145(11): 111011.
Paper No: GTP-23-1304
https://doi.org/10.1115/1.4063282
Published Online: September 29, 2023
View Article titled, On the Performance of Hydrostatic Journal Bearings in Air, Water, and Liquid Nitrogen: Measurements and Predictions
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Topics: Bearings, Hydrostatics, Journal bearings, Nitrogen, Stress, Water, Fluids, Pressure, Flow (Dynamics)
Journal Articles

Experimental Force Coefficients of a Hydrostatic Thrust Bearing and Comparisons to Predictions

Homin Lim, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2023, 145(11): 111010.
Paper No: GTP-23-1303
https://doi.org/10.1115/1.4063308
Published Online: September 29, 2023
View Article titled, Experimental Force Coefficients of a Hydrostatic Thrust Bearing and Comparisons to Predictions
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Topics: Bearings, Film thickness, Hydrostatics, Stress, Thrust bearings, Pressure, Stiffness, Hammers, Thrust
Proceedings Papers

Experimental Force Coefficients of a Hydrostatic Thrust Bearing and Comparisons to Predictions

Homin Lim, Keun Ryu
Proc. ASME. GT2023, Volume 11A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics, V11AT22A037, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104057
https://doi.org/10.1115/GT2023-104057
View Paper titled, Experimental Force Coefficients of a Hydrostatic Thrust Bearing and Comparisons to Predictions
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Topics: Bearings, Fluid films, Hammers, Hydrostatics, Stress, Thrust bearings
Proceedings Papers

On the Performance of Hydrostatic Journal Bearings in Air, Water, and Liquid Nitrogen: Measurements and Predictions

Hyunsung Jung, Kyuman Kim, Keun Ryu
Proc. ASME. GT2023, Volume 11A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics, V11AT22A036, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104040
https://doi.org/10.1115/GT2023-104040
View Paper titled, On the Performance of Hydrostatic Journal Bearings in Air, Water, and Liquid Nitrogen: Measurements and Predictions
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Topics: Bearings, Hydrostatics, Journal bearings, Nitrogen, Stress, Water
Proceedings Papers

On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions

Hyunsung Jung, Seki Sin, Kyuman Kim, Junwon Heo, Minsoo Wee, Keun Ryu
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT22A026, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-84146
https://doi.org/10.1115/GT2022-84146
View Paper titled, On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions
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Topics: Bearings, Damping, Gas bearings, Hammers
Journal Articles

On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions

Hyunsung Jung, Seki Sin, Kyuman Kim, Junwon Heo, Minsoo Wee, Keun Ryu
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. December 2022, 144(12): 121011.
Paper No: GTP-22-1366
https://doi.org/10.1115/1.4055485
Published Online: October 7, 2022
View Article titled, On the Pneumatic Hammer of Hybrid Gas Bearings: Measurements and Predictions
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Topics: Bearings, Damping, Hammers, Pressure, Gas bearings, Stress, Vibration
Journal Articles

Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers

Keun Ryu, Zachary Ashton
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2017, 139(3): 032301.
Paper No: GTP-16-1301
https://doi.org/10.1115/1.4034359
Published Online: September 27, 2016
View Article titled, Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers
Open the PDF for Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers in another window
Topics: Bearings, Drag (Fluid dynamics), Engines, Friction, Rotors, Turbochargers, Temperature, Compressors
Proceedings Papers

Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers

Keun Ryu, Zachary Ashton
Proc. ASME. GT2016, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T23A034, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57855
https://doi.org/10.1115/GT2016-57855
View Paper titled, Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers
Open the PDF for Oil-Free Automotive Turbochargers: Drag Friction and On-Engine Performance Comparisons to Oil-Lubricated Commercial Turbochargers in another window
Topics: Drag (Fluid dynamics), Engines, Friction, Turbochargers, Rotors, Bearings, Reliability, Shorelines, Wear, Compressors
Journal Articles

Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance

Keun Ryu, Zachary Ashton
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2016, 138(4): 042501.
Paper No: GTP-15-1275
https://doi.org/10.1115/1.4031440
Published Online: October 13, 2015
View Article titled, Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance
Open the PDF for Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance in another window
Topics: Bearings, Rotors, Temperature, Turbines, Foil bearings, Compressors, Gas bearings, Turbochargers
Proceedings Papers

Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance

Keun Ryu, Zachary Ashton
Proc. ASME. GT2015, Volume 8: Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V008T23A026, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43927
https://doi.org/10.1115/GT2015-43927
View Paper titled, Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance
Open the PDF for Bump-Type Foil Bearings and Flexure Pivot Tilting Pad Bearings for Oil-Free Automotive Turbochargers: Highlights in Rotordynamic Performance in another window
Topics: Bearings, Bending (Stress), Foil bearings, Turbochargers, Rotors, Gas bearings, Temperature, Clearances (Engineering), Reliability, Stability
Journal Articles

Prediction of Gas Thrust Foil Bearing Performance for Oil-Free Automotive Turbochargers

Luis San Andrés, Keun Ryu, Paul Diemer
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2015, 137(3): 032502.
Paper No: GTP-14-1364
https://doi.org/10.1115/1.4028389
Published Online: September 30, 2014
View Article titled, Prediction of Gas Thrust Foil Bearing Performance for Oil-Free Automotive Turbochargers
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Topics: Bearings, Damping, Drag (Fluid dynamics), Film thickness, Foil bearings, Stiffness, Stress, Thrust, Turbochargers, Temperature
Proceedings Papers

Prediction of Gas Thrust Foil Bearing Performance for Oil-Free Automotive Turbochargers

Luis San Andrés, Keun Ryu, Paul Diemer
Proc. ASME. GT2014, Volume 1B: Marine; Microturbines, Turbochargers and Small Turbomachines; Steam Turbines, V01BT24A013, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-25940
https://doi.org/10.1115/GT2014-25940
View Paper titled, Prediction of Gas Thrust Foil Bearing Performance for Oil-Free Automotive Turbochargers
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Topics: Foil bearings, Thrust, Turbochargers, Stress, Drag (Fluid dynamics), Bearings, Damping, Stiffness, Temperature, Torque
Proceedings Papers

On the Failure of a Gas Foil Bearing: High Temperature Operation Without Cooling Flow

Keun Ryu, Luis San Andrés
Proc. ASME. GT2013, Volume 7A: Structures and Dynamics, V07AT29A006, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-94244
https://doi.org/10.1115/GT2013-94244
View Paper titled, On the Failure of a Gas Foil Bearing: High Temperature Operation Without Cooling Flow
Open the PDF for On the Failure of a Gas Foil Bearing: High Temperature Operation Without Cooling Flow in another window
Topics: Cooling, Failure, Flow (Dynamics), Foil bearings, High temperature, Rotors, Temperature, Bearings, Reliability, Air flow