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Journal Articles

Rotordynamic Behavior of 225 kW (300 HP) Class PMS Motor–Generator System Supported by Gas Foil Bearings

Bok Seong Choe, Tae Ho Kim, Chang Ho Kim, Yong Bok Lee
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. September 2015, 137(9): 092505.
Paper No: GTP-14-1650
DOI: https://doi.org/10.1115/1.4029712
Published Online: September 1, 2015
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Topics: Bearings, Engines, Generators, Motors, Rotors, Foil bearings
Proceedings Papers

Rotordynamic Behavior of 225 kW (300 HP) Class PMS Motor-Generator System Supported by Gas Foil Bearings

Bok Seong Choe, Tae Ho Kim, Chang Ho Kim, Yong Bok Lee
Proc. ASME. GT2014, Volume 7A: Structures and Dynamics, V07AT31A037, June 16–20, 2014
Paper No: GT2014-27286
DOI: https://doi.org/10.1115/GT2014-27286
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Topics: Engines, Foil bearings, Generators, Motors, Rotors, Bearings, Damping, Delays, Inspection, Journal bearings
Journal Articles

Dynamic Performance Characteristics of Floating-Ring Bearings With Varied Oil-Injection Swirl-Control Angles

Daniel Tamunodukobipi, Chang Ho Kim, Yong-Bok Lee
Journal: Journal of Dynamic Systems, Measurement, and Control
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. February 2015, 137(2): 021002.
Paper No: DS-13-1440
DOI: https://doi.org/10.1115/1.4027912
Published Online: September 10, 2014
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Topics: Bearings, Damping, Pressure, Signals, Stability, Stress, Stiffness, Performance characterization
Proceedings Papers

Effects of Mesh Density on Static Load Performance of Metal Mesh Gas Foil Bearings

Yong-Bok Lee, Chang Ho Kim, Tae Ho Kim, Tae Young Kim
Proc. ASME. GT2011, Volume 6: Structures and Dynamics, Parts A and B, 675-683, June 6–10, 2011
Paper No: GT2011-46589
DOI: https://doi.org/10.1115/GT2011-46589
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Topics: Density, Foil bearings, Metals, Stress, Rotors, Damping, Deflection, Bearings, Stiffness, Spin (Aerodynamics)
Proceedings Papers

Vibration Control of a High Speed Rotor Supported by the Combined Smart Bearing

Se Na Jeong, Tae Ho Kim, Chang Ho Kim, Yong Bok Lee
Proc. ASME. IJTC2011, ASME/STLE 2011 Joint Tribology Conference, 333-335, October 24–26, 2011
Paper No: IJTC2011-61177
DOI: https://doi.org/10.1115/IJTC2011-61177
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Topics: Bearings, Rotors, Vibration control, Design, Dynamic analysis, Dynamic stability, Foil bearings, Load bearing capacity, Machinery, Magnetic bearings
Journal Articles

Effects of Mesh Density on Static Load Performance of Metal Mesh Gas Foil Bearings

Yong-Bok Lee, Chang Ho Kim, Tae Ho Kim, Tae Young Kim
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2012, 134(1): 012502.
DOI: https://doi.org/10.1115/1.4004142
Published Online: October 27, 2011
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Topics: Bearings, Damping, Deflection, Density, Foil bearings, Metals, Rotors, Stiffness, Stress, Wire
Proceedings Papers

Rotordynamic Performance of an Oil-Free Turbocharger Supported on Gas Foil Bearings: Effects of an Assembly Radial Clearance

Tae Ho Kim, Jangwon Lee, Chang Ho Kim, Yong-Bok Lee
Proc. ASME. GT2010, Volume 6: Structures and Dynamics, Parts A and B, 363-371, June 14–18, 2010
Paper No: GT2010-23243
DOI: https://doi.org/10.1115/GT2010-23243
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Topics: Clearances (Engineering), Foil bearings, Manufacturing, Turbochargers, Bearings, Engines, Rotors, Deflection, Ignition, Lubricants
Proceedings Papers

Static and Dynamic Characteristics of Air Foil Thrust Bearing Considering Tilting Pad Condition

Dong-Jin Park, Yong-Bok Lee, Chang-Ho Kim, Gun-Hee Jang
Proc. ASME. GT2007, Volume 5: Turbo Expo 2007, 931-942, May 14–17, 2007
Paper No: GT2007-27814
DOI: https://doi.org/10.1115/GT2007-27814
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Topics: Thrust, Thrust bearings, Bearings, Load bearing capacity, Damping, Finite element methods, Pressure, Rotors, Stiffness, Torque
Proceedings Papers

Dynamic Characteristics of Bump Foils Considering With Thermal Effect in Air Foil Bearings

Yong-Bok Lee, Jun-Hyeon Jo, Dong-Jin Park, Chang-Ho Kim, Yoon-Chul Rhim
Proc. ASME. IJTC2006, Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 1327-1335, October 23–25, 2006
Paper No: IJTC2006-12189
DOI: https://doi.org/10.1115/IJTC2006-12189
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Topics: Coulombs, Damping, Foil bearings, Stiffness, Temperature effects
Proceedings Papers

Analysis of Leakage Flow and Dynamic Characteristics in Floating Ring Seals for High Pressure Turbopump

Yong-Bok Lee, Chang-Ho Kim, Wenbo Duan, Fulei Chu
Proc. ASME. GT2006, Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B, 1341-1349, May 8–11, 2006
Paper No: GT2006-91008
DOI: https://doi.org/10.1115/GT2006-91008
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Topics: High pressure (Physics), Leakage flows, Flow (Dynamics), Algorithms, Equilibrium (Physics), Fast Fourier transforms, Fourier series, Locks (Waterways), Navier-Stokes equations, Partial differential equations
Journal Articles

Analysis for Rotordynamic Coefficients of Helically-Grooved Turbulent Annular Seals

Chang-Ho Kim, D. W. Childs
Journal: Journal of Tribology
Article Type: Research Papers
J. Tribol. January 1987, 109(1): 136–143.
DOI: https://doi.org/10.1115/1.3261305
Published Online: January 1, 1987
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Topics: Turbulence, Leakage, Rotors, Stability, Engines, High pressure (Physics), Lubrication theory, Oxygen, Pressure, Pumps
Journal Articles

Test Results For Round-Hole-Pattern Damper Seals: Optimum Configurations and Dimensions for Maximum Net Damping

D. W. Childs, Chang-Ho Kim
Journal: Journal of Tribology
Article Type: Research Papers
J. Tribol. October 1986, 108(4): 605–609.
DOI: https://doi.org/10.1115/1.3261277
Published Online: October 1, 1986
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Topics: Dampers, Damping, Dimensions, Stators, Rotors, Surface roughness, Leakage, Stiffness
Journal Articles

Closure to “Discussions of ‘Test Results for Round-Hole-Pattern Damper Seals: Optimum Configurations and Dimensions for Maximum Net Damping’” (1986, ASME J. Tribol., 108, p. 610)

D. W. Childs, Chang-Ho Kim
Journal: Journal of Tribology
Article Type: Discussions
J. Tribol. October 1986, 108(4): 611.
DOI: https://doi.org/10.1115/1.3261281
Published Online: October 1, 1986
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Topics: Dampers, Dimensions
Journal Articles

Closure to “Discussions of ‘Analysis and Testing for Rotordynamic Coefficients of Turbulent Annular Seals With Different, Directionally-Homogeneous Surface-Roughness Treatment for Rotor and Stator Elements’” (1985, ASME J. Tribol., 107, pp. 305–306)

D. W. Childs, Chang-Ho Kim
Journal: Journal of Tribology
Article Type: Discussions
J. Tribol. July 1985, 107(3): 306.
DOI: https://doi.org/10.1115/1.3261058
Published Online: July 1, 1985
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Topics: Rotors, Stators, Surface roughness, Testing, Turbulence
Journal Articles

Analysis and Testing for Rotordynamic Coefficients of Turbulent Annular Seals With Different, Directionally-Homogeneous Surface-Roughness Treatment for Rotor and Stator Elements

D. W. Childs, Chang-Ho Kim
Journal: Journal of Tribology
Article Type: Research Papers
J. Tribol. July 1985, 107(3): 296–305.
DOI: https://doi.org/10.1115/1.3261054
Published Online: July 1, 1985
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Topics: Rotors, Stators, Surface roughness, Testing, Turbulence, Damping, Dampers, Leakage, Pressure, Centrifugal pumps