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Patrick S. Keogh
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Journal Articles

Rotordynamics of a Single-Stage Brush Seal in Isolation: The Effects of Variable Stiffness and Back Plate Geometry

Accepted Manuscript
Joshua Bird, Patrick S Keogh, Carl Sangan, Aaron Bowsher, Peter Crudgington, James Scobie
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power.
Paper No: GTP-24-1607
https://doi.org/10.1115/1.4066711
Published Online: September 28, 2024
View Article titled, Rotordynamics of a Single-Stage Brush Seal in Isolation: The Effects of Variable Stiffness and Back Plate Geometry
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Topics: Geometry, Rotordynamics, Stiffness, Pressure, Leakage, Engines, Gas turbines, Damping, Density, Excitation
Proceedings Papers

Rotordynamics of a Single-Stage Brush Seal in Isolation: The Effects of Variable Stiffness and Back Plate Geometry

Joshua Bird, Patrick S. Keogh, Carl M. Sangan, Aaron A. Bowsher, Peter F. Crudgington, James A. Scobie
Proc. ASME. GT2024, Volume 10B: Structures and Dynamics — Fatigue, Fracture, and Life Prediction; Probabilistic Methods; Rotordynamics; Structural Mechanics and Vibration, V10BT26A020, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-128839
https://doi.org/10.1115/GT2024-128839
View Paper titled, Rotordynamics of a Single-Stage Brush Seal in Isolation: The Effects of Variable Stiffness and Back Plate Geometry
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Topics: Damping, Geometry, Rotordynamics, Stiffness
Journal Articles

Dynamic Characterization of an Adaptive Film-Riding Seal

Joshua Bird, Patrick S. Keogh, Carl M. Sangan, Aaron A. Bowsher, Peter F. Crudgington, James A. Scobie
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2024, 146(1): 011017.
Paper No: GTP-23-1368
https://doi.org/10.1115/1.4063549
Published Online: November 21, 2023
View Article titled, Dynamic Characterization of an Adaptive Film-Riding Seal
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Topics: Clearances (Engineering), Computer simulation, Damping, Fluid films, Pressure, Rotors, Stiffness, Modeling, Displacement, Pressure drop
Journal Articles

Investigation of Fault Modeling in the Identification of Bearing Wear Severity

Diogo Stuani Alves, Tiago Henrique Machado, Felipe Wenzel da Silva Tuckmantel, Patrick S. Keogh, Katia Lucchesi Cavalca
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2022, 144(7): 071802.
Paper No: TRIB-21-1318
https://doi.org/10.1115/1.4053178
Published Online: December 22, 2021
View Article titled, Investigation of Fault Modeling in the Identification of Bearing Wear Severity
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Topics: Bearings, Wear, Modeling, Rotors
Proceedings Papers

On the Development of a Pressure Actuated Leaf Seal for Turbomachinery Applications

Ernesto Pedraza-Valle, Georgios Papageorgiou, Aaron Bowsher, Peter F. Crudgington, Carl M. Sangan, Patrick S. Keogh, James A. Scobie
Proc. ASME. GT2019, Volume 5B: Heat Transfer, V05BT15A009, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90991
https://doi.org/10.1115/GT2019-90991
View Paper titled, On the Development of a Pressure Actuated Leaf Seal for Turbomachinery Applications
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Topics: Pressure, Turbomachinery, Leakage, Clearances (Engineering), Pressure drop, Rotors, Design, Displacement, Eddies (Fluid dynamics), Eddy currents (Electricity)
Proceedings Papers

Large Deformation of Flexure Couplings for Robotic Arm Joints

Nicola Y. Bailey, Chris Lusty, Patrick S. Keogh
Proc. ASME. IMECE2017, Volume 4B: Dynamics, Vibration, and Control, V04BT05A016, November 3–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2017-71353
https://doi.org/10.1115/IMECE2017-71353
View Paper titled, Large Deformation of Flexure Couplings for Robotic Arm Joints
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Topics: Bending (Stress), Couplings, Deformation, Robotics, Bearings, Hinges, Machinery, Trajectories (Physics), Transmission parts
Proceedings Papers

Nonlinear Dynamics and Control of Rotors Operating Within the Clearance Gaps of Magnetic Bearing Systems

Patrick S. Keogh, Chris Lusty, Nicola Y. Bailey
Proc. ASME. IMECE2017, Volume 4B: Dynamics, Vibration, and Control, V04BT05A012, November 3–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2017-71865
https://doi.org/10.1115/IMECE2017-71865
View Paper titled, Nonlinear Dynamics and Control of Rotors Operating Within the Clearance Gaps of Magnetic Bearing Systems
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Topics: Clearances (Engineering), Magnetic bearings, Nonlinear dynamics, Rotors, Bearings, Levitation, Stators, Contact dynamics, Control systems, Dynamics (Mechanics)
Proceedings Papers

A Comparison of the Capacity for Precise Motion Control Between Hinged Joints and Flexure Joints

Chris Lusty, Nicola Y. Bailey, Patrick S. Keogh
Proc. ASME. IMECE2017, Volume 4A: Dynamics, Vibration, and Control, V04AT05A019, November 3–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2017-71350
https://doi.org/10.1115/IMECE2017-71350
View Paper titled, A Comparison of the Capacity for Precise Motion Control Between Hinged Joints and Flexure Joints
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Topics: Bending (Stress), Motion control, Displacement, Design, Hinges, Machine design, Machinery, Micromechanical devices, Modeling, Reliability
Journal Articles

Discussion of “A Review of the Rotordynamic Thermally Induced Synchronous Instability (Morton) Effect” (Tong, X., Palazzolo, A., and Suh, J., 2017, ASME Appl. Mech. Rev., 69(6), p. 060801)

Patrick S. Keogh
Journal: Applied Mechanics Reviews
Publisher: ASME
Article Type: Discussions
Appl. Mech. Rev. November 2017, 69(6): 065501.
Paper No: AMR-17-1028
https://doi.org/10.1115/1.4037217
Published Online: October 20, 2017
View Article titled, Discussion of “A Review of the Rotordynamic Thermally Induced Synchronous Instability (Morton) Effect” (Tong, X., Palazzolo, A., and Suh, J., 2017, ASME Appl. Mech. Rev., 69(6), p. 060801)
Open the PDF for Discussion of “A Review of the Rotordynamic Thermally Induced Synchronous Instability (Morton) Effect” (Tong, X., Palazzolo, A., and Suh, J., 2017, ASME Appl. Mech. Rev., 69(6), p. 060801) in another window
Topics: Bearings, Design, Dynamics (Mechanics), Heating, Rotors, Vibration, Convection, Heat transfer, Heat, Machinery
Proceedings Papers

Switching Action in Rotor-AMB Systems for Smooth Vibration Control

Muhao Wang, M. Necip Sahinkaya, Patrick S. Keogh
Proc. ASME. GT2013, Volume 7A: Structures and Dynamics, V07AT29A020, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95498
https://doi.org/10.1115/GT2013-95498
View Paper titled, Switching Action in Rotor-AMB Systems for Smooth Vibration Control
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Topics: Rotors, Vibration control, Control equipment, Signals, Transients (Dynamics), Vibration, Levitation, Machinery, Magnetic bearings, Rotor vibration
Proceedings Papers

Touchdown Bearing Contact Forces in Magnetic Bearing Systems

Fawaz Y. Saket, M. Necip Sahinkaya, Patrick S. Keogh
Proc. ASME. GT2013, Volume 7A: Structures and Dynamics, V07AT29A021, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-95510
https://doi.org/10.1115/GT2013-95510
View Paper titled, Touchdown Bearing Contact Forces in Magnetic Bearing Systems
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Topics: Bearings, Magnetic bearings, Contact dynamics, Levitation, Rotors, Stress, Transients (Dynamics), Design, Force measurement, Machinery
Proceedings Papers

Active Recovery of Contact-Free Levitation in Magnetic Bearing Systems

Peichao Li, M. Necip Sahinkaya, Patrick S. Keogh
Proc. ASME. IDETC-CIE2012, Volume 1: 24th Conference on Mechanical Vibration and Noise, Parts A and B, 673-680, August 12–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: DETC2012-70641
https://doi.org/10.1115/DETC2012-70641
View Paper titled, Active Recovery of Contact-Free Levitation in Magnetic Bearing Systems
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Topics: Levitation, Magnetic bearings, Bearings, Rotors, Damping, Dynamic systems, Failure, Friction, Gas bearings, Manufacturing
Proceedings Papers

Destabilization of Forward Rub in Rotor Magnetic Bearing Systems Using Actively Controlled Auxiliary Bearings

Iain S. Cade, M. Necip Sahinkaya, Clifford R. Burrows, Patrick S. Keogh
Proc. ASME. GT2010, Volume 6: Structures and Dynamics, Parts A and B, 273-282, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-23028
https://doi.org/10.1115/GT2010-23028
View Paper titled, Destabilization of Forward Rub in Rotor Magnetic Bearing Systems Using Actively Controlled Auxiliary Bearings
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Topics: Bearings, Magnetic bearings, Rotors, Design, Levitation, Safety, Stators
Proceedings Papers

Experiments on the Transient Performance of an Adaptive Multi-Objective Controller for Rotating Machinery

M. Necip Sahinkaya, Abdul-Hadi G. Abulrub, Patrick S. Keogh, Clifford R. Burrows
Proc. ASME. GT2010, Volume 6: Structures and Dynamics, Parts A and B, 399-408, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-23482
https://doi.org/10.1115/GT2010-23482
View Paper titled, Experiments on the Transient Performance of an Adaptive Multi-Objective Controller for Rotating Machinery
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Topics: Control equipment, Machinery, Transients (Dynamics), Rotors, Bearings, Actuators, Adaptive control, Magnetic bearings, Rotor vibration
Journal Articles

Experiments on the Transient Performance of an Adaptive Multi-Objective Controller for Rotating Machinery

M. Necip Sahinkaya, Abdul-Hadi G. Abulrub, Patrick S. Keogh, Clifford R. Burrows
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. February 2011, 133(2): 022503.
https://doi.org/10.1115/1.4002016
Published Online: October 28, 2010
View Article titled, Experiments on the Transient Performance of an Adaptive Multi-Objective Controller for Rotating Machinery
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Topics: Control equipment, Magnetic bearings, Rotors, Transients (Dynamics), Bearings, Adaptive control, Machinery, Vibration
Proceedings Papers

Accurate Decoupled Linear Modeling for Robust H ∞ Control of Multi Axis Shaking Tables

Ali Ghorashi, Andrew R. Plummer, Kevin A. Edge, Patrick S. Keogh
Proc. ASME. DSCC2009, ASME 2009 Dynamic Systems and Control Conference, Volume 2, 643-650, October 12–14, 2009
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2009-2559
https://doi.org/10.1115/DSCC2009-2559
View Paper titled, Accurate Decoupled Linear Modeling for Robust H ∞ Control of Multi Axis Shaking Tables
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Topics: Modeling, Control equipment, Design, Dynamic analysis, Errors, Parameter estimation, Servomechanisms, Simulation, Uncertainty
Journal Articles

A Multiobjective Adaptive Controller for Magnetic Bearing Systems

M. Necip Sahinkaya, Abdul-Hadi G. Abulrub, Clifford R. Burrows, Patrick S. Keogh
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. December 2010, 132(12): 122503.
https://doi.org/10.1115/1.4001060
Published Online: August 27, 2010
View Article titled, A Multiobjective Adaptive Controller for Magnetic Bearing Systems
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Topics: Control equipment, Magnetic bearings, Rotors, Bearings, Weight (Mass), Vibration, Rotor vibration
Journal Articles

An Active Auxiliary Bearing Control Strategy to Reduce the Onset of Asynchronous Periodic Contact Modes in Rotor/Magnetic Bearing Systems

Iain S. Cade, M. Necip Sahinkaya, Clifford R. Burrows, Patrick S. Keogh
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. May 2010, 132(5): 052502.
https://doi.org/10.1115/1.3204644
Published Online: March 3, 2010
View Article titled, An Active Auxiliary Bearing Control Strategy to Reduce the Onset of Asynchronous Periodic Contact Modes in Rotor/Magnetic Bearing Systems
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Topics: Bearings, Magnetic bearings, Rotors, Control equipment
Proceedings Papers

An Active Auxiliary Bearing Control Strategy to Reduce the Onset of Asynchronous Periodic Contact Modes in Rotor/Magnetic Bearing Systems

Iain S. Cade, M. Necip Sahinkaya, Clifford R. Burrows, Patrick S. Keogh
Proc. ASME. GT2009, Volume 6: Structures and Dynamics, Parts A and B, 855-865, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-59659
https://doi.org/10.1115/GT2009-59659
View Paper titled, An Active Auxiliary Bearing Control Strategy to Reduce the Onset of Asynchronous Periodic Contact Modes in Rotor/Magnetic Bearing Systems
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Topics: Bearings, Magnetic bearings, Rotors, Control equipment, Degrees of freedom, Dynamic response, Stators, Thermal stresses
Proceedings Papers

A Multi-Objective Adaptive Controller for Magnetic Bearing Systems

M. Necip Sahinkaya, Abdul-Hadi G. Abulrub, Clifford R. Burrows, Patrick S. Keogh
Proc. ASME. GT2009, Volume 6: Structures and Dynamics, Parts A and B, 1063-1071, June 8–12, 2009
Publisher: American Society of Mechanical Engineers
Paper No: GT2009-60335
https://doi.org/10.1115/GT2009-60335
View Paper titled, A Multi-Objective Adaptive Controller for Magnetic Bearing Systems
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Topics: Control equipment, Magnetic bearings, Rotors, Rotor vibration, Bearings, Displacement, Eddies (Fluid dynamics), Eddy currents (Electricity), Pareto optimization, Stability