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Proceedings Papers

Static Stiffness Measurements for a Thrust Collar Used in an Integrally Geared Compressor

Thomas Kerr, Adolfo Delgado, Dara Childs
Proc. ASME. GT2019, Volume 7B: Structures and Dynamics, V07BT34A013, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90488
https://doi.org/10.1115/GT2019-90488
View Paper titled, Static Stiffness Measurements for a Thrust Collar Used in an Integrally Geared Compressor
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Topics: Compressors, Stiffness, Thrust, Stress, Particle spin, Rotation, Spin (Aerodynamics), Deflection, Cables, Gears
Journal Articles

Static and Dynamic Coefficient Measurements for a Thrust Collar Used in an Integrally Geared Compressor

Thomas Kerr, Andrew Crandall, Dara Childs, Adolfo Delgado
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. May 2019, 141(5): 051020.
Paper No: GTP-18-1314
https://doi.org/10.1115/1.4041654
Published Online: March 14, 2019
View Article titled, Static and Dynamic Coefficient Measurements for a Thrust Collar Used in an Integrally Geared Compressor
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Topics: Compressors, Damping, Deflection, Degrees of freedom, Hammers, Rotation, Stiffness, Stress, Test facilities, Thrust
Proceedings Papers

A Simple (1-Flexible Rotor) Model That Shows Bull Gear Runout As a Source of Subsynchronous, Lateral, Vibration in Integrally Geared Compressor (IGC) Pinions

Dara Childs, Andrew Crandall
Proc. ASME. GT2018, Volume 7A: Structures and Dynamics, V07AT33A009, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75326
https://doi.org/10.1115/GT2018-75326
View Paper titled, A Simple (1-Flexible Rotor) Model That Shows Bull Gear Runout As a Source of Subsynchronous, Lateral, Vibration in Integrally Geared Compressor (IGC) Pinions
Open the PDF for A Simple (1-Flexible Rotor) Model That Shows Bull Gear Runout As a Source of Subsynchronous, Lateral, Vibration in Integrally Geared Compressor (IGC) Pinions in another window
Topics: Compressors, Gears, Rotors, Vibration, Stiffness, Bearings, Compressor impellers, Damping, Disks, Excitation
Proceedings Papers

Development and Validation of Test Rig for Measurements of Leakage and Rotordynamic Performance of Interlocking Labyrinth Seals

Mauricio Ramirez, Dara Childs, Keith Gary
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A045, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-77131
https://doi.org/10.1115/GT2018-77131
View Paper titled, Development and Validation of Test Rig for Measurements of Leakage and Rotordynamic Performance of Interlocking Labyrinth Seals
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Topics: Leakage, Cavities, Damping, Pressure, Rotors, Stators, Stiffness, Pressure measurement, Turbomachinery, Waves
Proceedings Papers

Static and Dynamic Coefficient Measurements for a Thrust Collar Used in an Integrally Geared Compressor

Thomas Kerr, Andrew Crandall, Dara Childs, Adolfo Delgado
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A011, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75335
https://doi.org/10.1115/GT2018-75335
View Paper titled, Static and Dynamic Coefficient Measurements for a Thrust Collar Used in an Integrally Geared Compressor
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Topics: Compressors, Thrust, Stiffness, Stress, Test facilities, Vibration, Damping, Hammers, Machinery, Particle spin
Journal Articles

A New Structural Dynamic Model for Pump Mechanical Seals Vibration Analysis Incorporating Squeeze Motion of O-Ring Seals and General Dynamic Motion of the Pump Housing and the Pump Shaft

Dara Childs
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research-Article
J. Tribol. November 2018, 140(6): 062201.
Paper No: TRIB-17-1002
https://doi.org/10.1115/1.4038867
Published Online: July 3, 2018
View Article titled, A New Structural Dynamic Model for Pump Mechanical Seals Vibration Analysis Incorporating Squeeze Motion of O-Ring Seals and General Dynamic Motion of the Pump Housing and the Pump Shaft
Open the PDF for A New Structural Dynamic Model for Pump Mechanical Seals Vibration Analysis Incorporating Squeeze Motion of O-Ring Seals and General Dynamic Motion of the Pump Housing and the Pump Shaft in another window
Topics: Rotors, Seals, Stators, Yaw, Pumps, Damping
Journal Articles

Erratum: “Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing” [ASME J. Eng. Gas Turbines Power, 2009, 131 (6), p. 062502; DOI: 10.1115/1.3098376]

Joel Harris, Dara Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Errata
J. Eng. Gas Turbines Power. May 2018, 140(5): 057001.
Paper No: GTP-17-1515
https://doi.org/10.1115/1.4038615
Published Online: December 19, 2017
View Article titled, Erratum: “Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing” [ASME J. Eng. Gas Turbines Power, 2009, 131 (6), p. 062502; DOI: 10.1115/1.3098376]
Open the PDF for Erratum: “Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing” [ASME J. Eng. Gas Turbines Power, 2009, 131 (6), p. 062502; DOI: 10.1115/1.3098376] in another window
Topics: Gas turbines, Journal bearings, Performance characterization, Vibration
Proceedings Papers

A Water Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance

Luis San Andrés, Stephen Phillips, Dara Childs
Proc. ASME. GT2016, Volume 7B: Structures and Dynamics, V07BT31A010, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56349
https://doi.org/10.1115/GT2016-56349
View Paper titled, A Water Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance
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Topics: Stress, Thrust bearings, Water, Bearings, Flow (Dynamics), Pressure, Rotors, Clearances (Engineering), Thrust, Engines
Journal Articles

A Water-Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance

Luis San Andrés, Stephen Phillips, Dara Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2017, 139(2): 022506.
Paper No: GTP-16-1272
https://doi.org/10.1115/1.4034042
Published Online: September 13, 2016
View Article titled, A Water-Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance
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Topics: Bearings, Clearances (Engineering), Flow (Dynamics), Pressure, Rotors, Stress, Thrust bearings, Water, Thrust, Hydrostatics
Proceedings Papers

Rotordynamic Characteristics of a Flexure Pivot Pad Bearing With an Active and Locked Integral Squeeze Film Damper

Jeff Agnew, Dara Childs
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 551-561, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68564
https://doi.org/10.1115/GT2012-68564
View Paper titled, Rotordynamic Characteristics of a Flexure Pivot Pad Bearing With an Active and Locked Integral Squeeze Film Damper
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Topics: Bearings, Bending (Stress), Dampers, Stiffness, Damping, Rotors, Dynamic testing (Engineering), Dynamic testing (Materials), Journal bearings, Stability
Journal Articles

Discussion: “Rotordynamic Force Prediction of Centrifugal Compressor Impellers Using Computational Fluid Mechanics” by J. J. Moore, D. L. Ransom, and F. Viana

Dara Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Discussions
J. Eng. Gas Turbines Power. April 2011, 133(4): 045501.
https://doi.org/10.1115/1.2904894
Published Online: November 23, 2010
View Article titled, Discussion: “Rotordynamic Force Prediction of Centrifugal Compressor Impellers Using Computational Fluid Mechanics” by J. J. Moore, D. L. Ransom, and F. Viana
Open the PDF for Discussion: “Rotordynamic Force Prediction of Centrifugal Compressor Impellers Using Computational Fluid Mechanics” by J. J. Moore, D. L. Ransom, and F. Viana in another window
Topics: Compressor impellers, Compressors, Computational fluid dynamics, Fluid mechanics, Impellers, Pumps, Rotors, Pump impellers, Flow (Dynamics)
Proceedings Papers

Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing

Joel Harris, Dara Childs
Proc. ASME. GT2008, Volume 5: Structures and Dynamics, Parts A and B, 861-871, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50063
https://doi.org/10.1115/GT2008-50063
View Paper titled, Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing
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Topics: Journal bearings, Performance characterization, Stress, Bearings, Stiffness, Temperature, Clearances (Engineering), Damping, Equilibrium (Physics), Excitation
Proceedings Papers

Measurements Versus Predictions for Rotordynamic Characteristics of a Flexure Pivot-Pad Tilting Pad Bearing in an LBP Condition at Higher Unit Loads

J. Eric Hensley, Dara Childs
Proc. ASME. GT2008, Volume 5: Structures and Dynamics, Parts A and B, 873-881, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50066
https://doi.org/10.1115/GT2008-50066
View Paper titled, Measurements Versus Predictions for Rotordynamic Characteristics of a Flexure Pivot-Pad Tilting Pad Bearing in an LBP Condition at Higher Unit Loads
Open the PDF for Measurements Versus Predictions for Rotordynamic Characteristics of a Flexure Pivot-Pad Tilting Pad Bearing in an LBP Condition at Higher Unit Loads in another window
Topics: Bearings, Bending (Stress), Stress, Excitation, Stators, Stiffness
Proceedings Papers

Static and Dynamic Performance of Pressure Dam Bearings With Dam Steps That Are (I) Square and (II) Filleted

Dara Childs, Andrew Schaible, Bader Al Jughaiman
Proc. ASME. GT2008, Volume 5: Structures and Dynamics, Parts A and B, 931-939, June 9–13, 2008
Publisher: American Society of Mechanical Engineers
Paper No: GT2008-50136
https://doi.org/10.1115/GT2008-50136
View Paper titled, Static and Dynamic Performance of Pressure Dam Bearings With Dam Steps That Are (I) Square and (II) Filleted
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Topics: Bearings, Dams, Pressure, Design, Damping, Stiffness, Stability, Stress, Clearances (Engineering), Dimensions
Journal Articles

Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing

Dara Childs, Joel Harris
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. November 2009, 131(6): 062502.
https://doi.org/10.1115/1.3098376
Published Online: July 17, 2009
View Article titled, Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing
Open the PDF for Static Performance Characteristics and Rotordynamic Coefficients for a Four-Pad Ball-in-Socket Tilting Pad Journal Bearing in another window
Topics: Bearings, Damping, Stiffness, Stress, Performance characterization, Rotors, Excitation, Journal bearings
Proceedings Papers

Investigation Into a “Steam Whirl” Which Affected HP Rotors of 300 MW Steam Turbines

Janusz Kubiak Sz., Dara Childs, M. Rodri`guez, J. C. Garci´a
Proc. ASME. POWER2007, ASME 2007 Power Conference, 291-298, July 17–19, 2007
Publisher: American Society of Mechanical Engineers
Paper No: POWER2007-22030
https://doi.org/10.1115/POWER2007-22030
View Paper titled, Investigation Into a “Steam Whirl” Which Affected HP Rotors of 300 MW Steam Turbines
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Topics: Rotors, Steam, Steam turbines, Whirls, Bearings, Stress, Vibration, Simulation, Valves, Sealing (Process)
Proceedings Papers

Static and Dynamic Characteristics for a Pressure-Dam Bearing

Bader Al-Jughaiman, Dara Childs
Proc. ASME. GT2007, Volume 5: Turbo Expo 2007, 859-867, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-27577
https://doi.org/10.1115/GT2007-27577
View Paper titled, Static and Dynamic Characteristics for a Pressure-Dam Bearing
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Topics: Bearings, Dams, Pressure, Stress, Damping, Stiffness, Whirls, Algorithms, Clearances (Engineering), Dimensions
Proceedings Papers

Rotordynamic Coefficients Measurements Versus Predictions for a High Speed Flexure-Pivot Tilting-Pad Bearing (Load-Between-Pad Configuration)

Adnan Al-Ghasem, Dara Childs
Proc. ASME. GT2005, Volume 4: Turbo Expo 2005, 725-736, June 6–9, 2005
Publisher: American Society of Mechanical Engineers
Paper No: GT2005-68343
https://doi.org/10.1115/GT2005-68343
View Paper titled, Rotordynamic Coefficients Measurements Versus Predictions for a High Speed Flexure-Pivot Tilting-Pad Bearing (Load-Between-Pad Configuration)
Open the PDF for Rotordynamic Coefficients Measurements Versus Predictions for a High Speed Flexure-Pivot Tilting-Pad Bearing (Load-Between-Pad Configuration) in another window
Topics: Bearings, Bending (Stress), Stress, Stiffness, Damping, Flow (Dynamics), Rotors, Clearances (Engineering), Inertia (Mechanics), Stability
Journal Articles

Static and Dynamic Characteristics for a Pressure-Dam Bearing

Bader Al-Jughaiman, Dara Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. September 2008, 130(5): 052501.
https://doi.org/10.1115/1.2906173
Published Online: June 5, 2008
View Article titled, Static and Dynamic Characteristics for a Pressure-Dam Bearing
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Topics: Bearings, Dams, Pressure, Stress, Damping, Stiffness
Journal Articles

Discussion: “The Lomakin Effect in Annular Gas Seals Under Choked Flow Conditions” (Arghir, M., Defaye, C., and Frêne, F., 2007, ASME J. Eng. Gas Turbines Power, 129 , pp. 1028–1034)

Dara Childs
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Discussions
J. Eng. Gas Turbines Power. October 2007, 129(4): 1143.
https://doi.org/10.1115/1.2718218
Published Online: January 5, 2007
View Article titled, Discussion: “The Lomakin Effect in Annular Gas Seals Under Choked Flow Conditions” (Arghir, M., Defaye, C., and Frêne, F., 2007, ASME J. Eng. Gas Turbines Power, 129 , pp. 1028–1034)
Open the PDF for Discussion: “The Lomakin Effect in Annular Gas Seals Under Choked Flow Conditions” (Arghir, M., Defaye, C., and Frêne, F., 2007, ASME J. Eng. Gas Turbines Power, 129 , pp. 1028–1034) in another window
Topics: Flow (Dynamics), Gas turbines, Confined flow, Elastic constants