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Journal Articles

Identification of Dynamic Force Coefficients for an Additively Manufactured Hermetic Squeeze Film Bearing Support Damper Utilizing a Pass-Through Channel

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Bugra Ertas, Keith Gary, Tom Adcock
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2024, 146(6): 061008.
Paper No: GTP-23-1425
https://doi.org/10.1115/1.4063781
Published Online: January 4, 2024
View Articletitled, Identification of Dynamic Force Coefficients for an Additively Manufactured Hermetic Squeeze Film Bearing Support Damper Utilizing a Pass-Through Channel
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Topics: Bearings, Dampers, Damping, Design, Fluid structure interaction, Secondary cells, Stiffness, Additive manufacturing, Flow (Dynamics), Vibration
Proceedings Papers

Identification of Dynamic Force Coefficients for an Additively Manufactured Hermetic Squeeze Film Bearing Support Damper Utilizing a Pass-Through Channel

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Bugra Ertas, Keith Gary, Tom Adcock
Proc. ASME. GT2023, Volume 11A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics, V11AT22A038, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104108
https://doi.org/10.1115/GT2023-104108
View Paper titled, Identification of Dynamic Force Coefficients for an Additively Manufactured Hermetic Squeeze Film Bearing Support Damper Utilizing a Pass-Through Channel
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Topics: Additive manufacturing, Bearings, Dampers, Stiffness, Damping, Design, Fluid structure interaction, Computational fluid dynamics, Dynamic testing (Engineering), Finite element analysis
Proceedings Papers

Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electromechanical Rotor System Utilizing Gas Bearings: Part-2 Thermal Systems & Flow Loop Design

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Rahul A. Bidkar, Uttara Kumar, Xiaohua Zhang, Neelesh Sarawate, John Powers, Nevin M. Anandika, Bugra Ertas
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A028, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103989
https://doi.org/10.1115/GT2023-103989
View Paper titled, Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electromechanical Rotor System Utilizing Gas Bearings: Part-2 Thermal Systems & Flow Loop Design
Open the PDF for Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electromechanical Rotor System Utilizing Gas Bearings: Part-2 Thermal Systems & Flow Loop Design in another window
Topics: Carbon dioxide, Design, Flow (Dynamics), Gas bearings, Machinery, Rotors, Thermal analysis, Thermal systems, Turbomachinery
Proceedings Papers

Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electro-Mechanical Rotor System Utilizing Gas Bearings: Part-1 Mechanical and Electric Machine Design

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Bugra Ertas, John Powers, Keith Gary, Dave Torrey, Joseph Zierer, Peggy Baehmann, Vandana Rallabandi, Tom Adcock, Nevin Anandika, Rahul A. Bidkar
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A030, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104093
https://doi.org/10.1115/GT2023-104093
View Paper titled, Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electro-Mechanical Rotor System Utilizing Gas Bearings: Part-1 Mechanical and Electric Machine Design
Open the PDF for Test Rig Concept for Evaluating the Performance of a CO 2 Immersed Electro-Mechanical Rotor System Utilizing Gas Bearings: Part-1 Mechanical and Electric Machine Design in another window
Topics: Carbon dioxide, Gas bearings, Machine design, Rotors, Stress, Design, Rotordynamics, Thrust bearings, Turbomachinery, Bearing design
Proceedings Papers

Super-Critical Carbon Dioxide Power Cycle for Waste Heat Recovery Utilizing Hermetic Oil-Free Turbomachinery: Cycle and Conceptual Turbomachinery Design

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Bugra Ertas, Joseph Zierer, Aaron McClung, Dave Torrey, Rahul A. Bidkar, Doug Hofer, Vandana Rallabandi, Rajkeshar Singh, Xiaohua Zhang
Proc. ASME. GT2023, Volume 12: Supercritical CO2, V012T28A033, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-104245
https://doi.org/10.1115/GT2023-104245
View Paper titled, Super-Critical Carbon Dioxide Power Cycle for Waste Heat Recovery Utilizing Hermetic Oil-Free Turbomachinery: Cycle and Conceptual Turbomachinery Design
Open the PDF for Super-Critical Carbon Dioxide Power Cycle for Waste Heat Recovery Utilizing Hermetic Oil-Free Turbomachinery: Cycle and Conceptual Turbomachinery Design in another window
Topics: Carbon dioxide, Cycles, Design, Heat recovery, Thermodynamic power cycles, Turbomachinery, Bearings, Gas turbines, Organic Rankine cycle, Power systems (Machinery)
Proceedings Papers

Frequency Dependancy of Dynamic Force Coefficients for Hermetic Squeeze Film Dampers Utilizing Fluid-Bounding Flexible Structures

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Bugra Ertas, Keith Gary
Proc. ASME. GT2021, Volume 9A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Design and Engineering, V09AT24A020, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-60007
https://doi.org/10.1115/GT2021-60007
View Paper titled, Frequency Dependancy of Dynamic Force Coefficients for Hermetic Squeeze Film Dampers Utilizing Fluid-Bounding Flexible Structures
Open the PDF for Frequency Dependancy of Dynamic Force Coefficients for Hermetic Squeeze Film Dampers Utilizing Fluid-Bounding Flexible Structures in another window
Topics: Dampers, Flexible structures, Fluids, Design, Fluid structure interaction, Computational fluid dynamics, Finite element analysis, Architecture, Bearing design, Computer software
Journal Articles

Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Experimental Evaluation and Fluid–Structure Model Predictions

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Bugra Ertas, Keith Gary, Adolfo Delgado
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2021, 143(8): 081023.
Paper No: GTP-20-1671
https://doi.org/10.1115/1.4050864
Published Online: May 7, 2021
View Articletitled, Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Experimental Evaluation and Fluid–Structure Model Predictions
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Topics: Bearings, Fluids, Stress, Thrust, Thrust bearings, Turbomachinery, Pressure, Clearances (Engineering), Flow (Dynamics), Supercritical carbon dioxide
Journal Articles

Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Design and Proof of Concept Testing

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Bugra Ertas
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2021, 143(8): 081024.
Paper No: GTP-20-1710
https://doi.org/10.1115/1.4050865
Published Online: May 7, 2021
View Articletitled, Additively Manufactured Compliant Hybrid Gas Thrust Bearing for Supercritical Carbon Dioxide Turbomachinery: Design and Proof of Concept Testing
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Topics: Bearings, Design, Stress, Testing, Thrust, Thrust bearings, Turbomachinery, Additive manufacturing, Springs, Stiffness
Proceedings Papers

Additively Manufactured Compliant Hybrid Gas Thrust Bearing for sCO 2 Turbomachinery: Experimental Evaluation and Fluid-Structure Model Predictions

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Bugra Ertas, Keith Gary, Adolfo Delgado
Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A018, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14964
https://doi.org/10.1115/GT2020-14964
View Paper titled, Additively Manufactured Compliant Hybrid Gas Thrust Bearing for sCO 2 Turbomachinery: Experimental Evaluation and Fluid-Structure Model Predictions
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Topics: Additive manufacturing, Fluids, Thrust bearings, Turbomachinery, Stress, Bearings, Pressure, Hydrostatics, Thrust, Deflection
Proceedings Papers

A General-Purpose Test Facility for Evaluating Gas Lubricated Thrust Bearings

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Keith Gary, Bugra Ertas, Adolfo Delgado
Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A027, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15520
https://doi.org/10.1115/GT2020-15520
View Paper titled, A General-Purpose Test Facility for Evaluating Gas Lubricated Thrust Bearings
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Topics: Test facilities, Thrust bearings, Bearings, Fluids, Design, Gas turbines, Hydrostatics, Lubricants, Stress, Testing
Proceedings Papers

Additively Manufactured Compliant Hybrid Gas Thrust Bearing for sCO 2 Turbomachinery: Design and Proof of Concept Testing

Available to Purchase

Bugra Ertas
Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT25A017, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14959
https://doi.org/10.1115/GT2020-14959
View Paper titled, Additively Manufactured Compliant Hybrid Gas Thrust Bearing for sCO 2 Turbomachinery: Design and Proof of Concept Testing
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Topics: Additive manufacturing, Design, Testing, Thrust bearings, Turbomachinery, Bearings, Thrust, Deflection, Stiffness, Clearances (Engineering)
Journal Articles

Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers

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Keith Gary, Bugra Ertas
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. April 2020, 142(4): 041008.
Paper No: GTP-19-1373
https://doi.org/10.1115/1.4044643
Published Online: January 29, 2020
View Articletitled, Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers
Open the PDF for Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers in another window
Topics: Bearings, Dampers, Damping, Diffusion (Physics), Gas bearings, Rotors, Stress, Fluids, Excitation, Stiffness
Proceedings Papers

Compliant Hybrid Gas Bearing Using Integral Hermetically-Sealed Squeeze Film Dampers

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Bugra Ertas
Proc. ASME. GT2019, Volume 7B: Structures and Dynamics, V07BT34A023, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-90865
https://doi.org/10.1115/GT2019-90865
View Paper titled, Compliant Hybrid Gas Bearing Using Integral Hermetically-Sealed Squeeze Film Dampers
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Topics: Dampers, Gas bearings, Bearings, Cavities, Vibration, Bearing design, Damping, Design, Excitation, Fluid structure interaction
Proceedings Papers

Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers

Available to Purchase

Keith Gary, Bugra Ertas
Proc. ASME. GT2019, Volume 7B: Structures and Dynamics, V07BT34A029, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91109
https://doi.org/10.1115/GT2019-91109
View Paper titled, Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers
Open the PDF for Experimental Rotordynamic Force Coefficients for a Diffusion Bonded Compliant Hybrid Journal Gas Bearing Utilizing Fluid-Filled Hermetic Dampers in another window
Topics: Dampers, Diffusion (Physics), Fluids, Gas bearings, Bearings, Damping, Excitation, Rotors, Stress, Design
Journal Articles

Compliant Hybrid Gas Bearing Using Integral Hermetically Sealed Squeeze Film Dampers

Available to Purchase
Bugra Ertas
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. October 2019, 141(10): 101020.
Paper No: GTP-19-1384
https://doi.org/10.1115/1.4044644
Published Online: September 20, 2019
View Articletitled, Compliant Hybrid Gas Bearing Using Integral Hermetically Sealed Squeeze Film Dampers
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Topics: Bearings, Dampers, Damping, Stiffness, Fluids, Design, Cavities, Fluid structure interaction, Diaphragms (Mechanical devices), Diaphragms (Structural)
Journal Articles

Dynamic Characterization of a Novel Externally Pressurized Compliantly Damped Gas-Lubricated Bearing With Hermetically Sealed Squeeze Film Damper Modules

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Adolfo Delgado, Bugra Ertas
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2019, 141(2): 021028.
Paper No: GTP-18-1423
https://doi.org/10.1115/1.4041311
Published Online: October 16, 2018
View Articletitled, Dynamic Characterization of a Novel Externally Pressurized Compliantly Damped Gas-Lubricated Bearing With Hermetically Sealed Squeeze Film Damper Modules
Open the PDF for Dynamic Characterization of a Novel Externally Pressurized Compliantly Damped Gas-Lubricated Bearing With Hermetically Sealed Squeeze Film Damper Modules in another window
Topics: Bearings, Dampers, Design, Damping, Stiffness, Stress, Rotors
Journal Articles

Hermetically Sealed Squeeze Film Damper for Operation in Oil-Free Environments

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Bugra Ertas, Adolfo Delgado
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2019, 141(2): 022503.
Paper No: GTP-18-1421
https://doi.org/10.1115/1.4041520
Published Online: October 15, 2018
View Articletitled, Hermetically Sealed Squeeze Film Damper for Operation in Oil-Free Environments
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Topics: Dampers, Damping, Cavities, Fluids, Stiffness, Vibration
Journal Articles

Compliant Hybrid Gas Bearing Using Modular Hermetically Sealed Squeeze Film Dampers

Available to Purchase
Bugra Ertas, Adolfo Delgado
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2019, 141(2): 022504.
Paper No: GTP-18-1422
https://doi.org/10.1115/1.4041310
Published Online: October 15, 2018
View Articletitled, Compliant Hybrid Gas Bearing Using Modular Hermetically Sealed Squeeze Film Dampers
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Topics: Bearings, Dampers, Damping, Gas bearings, Flow (Dynamics), Stress, Stiffness
Proceedings Papers

Hermetically Sealed Squeeze Film Damper for Operation in Oil-Free Environments

Available to Purchase

Bugra Ertas, Adolfo Delgado
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A035, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76308
https://doi.org/10.1115/GT2018-76308
View Paper titled, Hermetically Sealed Squeeze Film Damper for Operation in Oil-Free Environments
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Topics: Dampers, Damping, Cavitation, Flow (Dynamics), Gas bearings, Stiffness, Clearances (Engineering), Bearings, Cavities, Density
Proceedings Papers

Compliant Hybrid Gas Bearing Using Modular Hermetically-Sealed Squeeze Film Dampers

Available to Purchase

Bugra Ertas, Adolfo Delgado
Proc. ASME. GT2018, Volume 7B: Structures and Dynamics, V07BT34A036, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76312
https://doi.org/10.1115/GT2018-76312
View Paper titled, Compliant Hybrid Gas Bearing Using Modular Hermetically-Sealed Squeeze Film Dampers
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Topics: Dampers, Gas bearings, Bearings, Damping, Stress, Flow (Dynamics), Testing, Bearing design, Carbon, Cavities