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Roger Fittro
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Journal Articles

Improving Disturbance Rejection in Nonlinear Active Magnetic Bearing Systems: Using Lur'e Formulation

Ali Gerami, Roger Fittro, Carl Knospe
Journal: Journal of Dynamic Systems, Measurement, and Control
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. April 2020, 142(4): 041007.
Paper No: DS-18-1365
https://doi.org/10.1115/1.4045778
Published Online: February 10, 2020
View Article titled, Improving Disturbance Rejection in Nonlinear Active Magnetic Bearing Systems: Using Lur'e Formulation
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Topics: Actuators, Control equipment, Design, Magnetic bearings, Electromagnets, Magnetization, Displacement
Journal Articles

Hydrodynamic Performance Characteristics of a Fluid Film Journal Bearing With a Rectangular Jacking Pocket

Michael Branagan, Neal Morgan, Christopher Goyne, Roger Fittro, Robert Rockwell, Minhui He
Journal: Journal of Tribology
Publisher: ASME
Article Type: Research Papers
J. Tribol. February 2020, 142(2): 021801.
Paper No: TRIB-19-1070
https://doi.org/10.1115/1.4045014
Published Online: November 16, 2019
View Article titled, Hydrodynamic Performance Characteristics of a Fluid Film Journal Bearing With a Rectangular Jacking Pocket
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Topics: Bearings, Computational fluid dynamics, Fluid films, Journal bearings, Pressure, Geometry, Stiffness, Regression models
Proceedings Papers

Response Surface Mapping and Multi-Objective Optimization of Crowning and Tapers in Water-Lubricated Thrust Bearings

Xin Deng, Cori Watson, Minhui He, Roger Fittro, Houston Wood
Proc. ASME. GT2019, Volume 7B: Structures and Dynamics, V07BT34A041, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91984
https://doi.org/10.1115/GT2019-91984
View Paper titled, Response Surface Mapping and Multi-Objective Optimization of Crowning and Tapers in Water-Lubricated Thrust Bearings
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Topics: Pareto optimization, Response surface methodology, Thrust bearings, Water, Design, Bearing design, Bearings, Film thickness, Optimization, Viscosity
Proceedings Papers

Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Thermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings: Part II

Xin Deng, Cori Watson, Minhui He, Roger Fittro, Houston Wood
Proc. ASME. IMECE2018, Volume 7: Fluids Engineering, V007T09A077, November 9–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2018-87798
https://doi.org/10.1115/IMECE2018-87798
View Paper titled, Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Thermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings: Part II
Open the PDF for Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Thermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings: Part II in another window
Topics: Computational fluid dynamics, Thrust bearings, Film thickness, Temperature, Stress, Bearings, Errors, Fluid films, Fluids engineering, Pressure
Journal Articles

Methodology of Turbulence Parameter Correction in Water-Lubricated Thrust Bearings

Xin Deng, Harrison Gates, Roger Fittro, Houston Wood
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. July 2019, 141(7): 071104.
Paper No: FE-18-1452
https://doi.org/10.1115/1.4042161
Published Online: January 7, 2019
View Article titled, Methodology of Turbulence Parameter Correction in Water-Lubricated Thrust Bearings
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Topics: Bearings, Film thickness, Modeling, Stress, Thrust bearings, Turbulence, Water, Viscosity, Reynolds number, Lubrication
Proceedings Papers

Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Isothermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings

Xin Deng, Cori Watson, Minhui He, Houston Wood, Roger Fittro
Proc. ASME. FEDSM2018, Volume 3: Fluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics, V003T12A017, July 15–20, 2018
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2018-83177
https://doi.org/10.1115/FEDSM2018-83177
View Paper titled, Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Isothermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings
Open the PDF for Comparison of Experimental, Thermoelastohydrodynamic (TEHD) and Isothermal, Non-Deforming Computational Fluid Dynamics (CFD) Results for Thrust Bearings in another window
Topics: Computational fluid dynamics, Thrust bearings, Stress, Lubrication, Thrust, Bearings, Turbulence, Film thickness, Pressure, Aerospace industry
Proceedings Papers

Turbulence Input Parameters Correction Methodology in Water Lubricated Thrust Bearings

Xin Deng, Harrison Gates, Brian Weaver, Houston Wood, Roger Fittro
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A019, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75597
https://doi.org/10.1115/GT2018-75597
View Paper titled, Turbulence Input Parameters Correction Methodology in Water Lubricated Thrust Bearings
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Topics: Thrust bearings, Turbulence, Water, Bearings, Viscosity, Eddies (Fluid dynamics), Lubrication, Fluids, Modeling, Film thickness
Journal Articles

Modeling Reichardt's Formula for Eddy Viscosity in the Fluid Film of Tilting Pad Thrust Bearings

Xin Deng, Brian Weaver, Cori Watson, Michael Branagan, Houston Wood, Roger Fittro
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2018, 140(8): 082505.
Paper No: GTP-17-1614
https://doi.org/10.1115/1.4038857
Published Online: April 26, 2018
View Article titled, Modeling Reichardt's Formula for Eddy Viscosity in the Fluid Film of Tilting Pad Thrust Bearings
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Topics: Bearings, Eddies (Fluid dynamics), Fluid films, Lubrication, Modeling, Reynolds number, Turbulence, Viscosity, Water, Film thickness
Proceedings Papers

Modeling Reichardt’s Formula for Eddy-Viscosity in the Fluid Film of Tilting Pad Thrust Bearings

Xin Deng, Brian Weaver, Cori Watson, Michael Branagan, Houston Wood, Roger Fittro
Proc. ASME. IMECE2017, Volume 7: Fluids Engineering, V007T09A069, November 3–9, 2017
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2017-71749
https://doi.org/10.1115/IMECE2017-71749
View Paper titled, Modeling Reichardt’s Formula for Eddy-Viscosity in the Fluid Film of Tilting Pad Thrust Bearings
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Topics: Eddies (Fluid dynamics), Fluid films, Modeling, Thrust bearings, Viscosity, Bearings, Turbulence, Water, Shear stress, Machinery
Proceedings Papers

Lubricant Inertia in Water Lubricated Bearings

Xin Deng, Cori Watson, Brian Weaver, Houston Wood, Roger Fittro
Proc. ASME. FEDSM2017, Volume 1A, Symposia: Keynotes; Advances in Numerical Modeling for Turbomachinery Flow Optimization; Fluid Machinery; Industrial and Environmental Applications of Fluid Mechanics; Pumping Machinery, V01AT03A005, July 30–August 3, 2017
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2017-69110
https://doi.org/10.1115/FEDSM2017-69110
View Paper titled, Lubricant Inertia in Water Lubricated Bearings
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Topics: Bearings, Inertia (Mechanics), Lubricants, Water, Turbulence, Pressure, Damping, Fluid films, Fluids, Machinery
Proceedings Papers

Understanding the Effect of Systematic Errors on the Accuracy of Experimental Measurements of Fluid-Film Bearing Dynamic Coefficients

Benstone Schwartz, Roger Fittro, Carl Knospe
Proc. ASME. GT2017, Volume 7A: Structures and Dynamics, V07AT34A028, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64665
https://doi.org/10.1115/GT2017-64665
View Paper titled, Understanding the Effect of Systematic Errors on the Accuracy of Experimental Measurements of Fluid-Film Bearing Dynamic Coefficients
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Topics: Bearings, Errors, Fluid films, Uncertainty, Stability, Computer simulation, Computer software, Design, Displacement measurement, Excitation
Journal Articles

Control of Magnetic Bearing With Material Saturation Nonlinearity

Ali Gerami, Paul Allaire, Roger Fittro
Journal: Journal of Dynamic Systems, Measurement, and Control
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. June 2015, 137(6): 061002.
Paper No: DS-14-1064
https://doi.org/10.1115/1.4029125
Published Online: June 1, 2015
View Article titled, Control of Magnetic Bearing With Material Saturation Nonlinearity
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Topics: Control equipment, Design, Magnetic bearings, Modeling, Transients (Dynamics), Feedback, Optimization, Electric current, Linear matrix inequalities, Stability