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Proceedings Papers

Fluid Inertia Forces in Squeeze Film Dampers

A. El-Shafei, S. M. Crandall
Proc. ASME. DETC91, 13th Biennial Conference on Mechanical Vibration and Noise: Rotating Machinery and Vehicle Dynamics, 219-228, September 22–25, 1991
Publisher: American Society of Mechanical Engineers
Paper No: DETC1991-0249
https://doi.org/10.1115/DETC1991-0249
View Paper titled, Fluid Inertia Forces in Squeeze Film Dampers
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Topics: Dampers, Fluids, Inertia (Mechanics), Approximation, Whirls, Reynolds number
Proceedings Papers

Modelling Fluid Inertia Forces of Short Journal Bearings for Rotordynamic Applications

A. El-Shafei
Proc. ASME. DETC93, 14th Biennial Conference on Mechanical Vibration and Noise: Vibration of Rotating Systems, 129-137, September 19–22, 1993
Publisher: American Society of Mechanical Engineers
Paper No: DETC1993-0187
https://doi.org/10.1115/DETC1993-0187
View Paper titled, Modelling Fluid Inertia Forces of Short Journal Bearings for Rotordynamic Applications
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Topics: Fluids, Inertia (Mechanics), Journal bearings, Modeling, Bearings, Pressure, Approximation, Damping, Engineering simulation, Film thickness
Journal Articles

Oil Whip Elimination Using Fuzzy Logic Controller

A. S. Dimitri, J. Mahfoud, A. El-Shafei
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2016, 138(6): 062502.
Paper No: GTP-15-1385
https://doi.org/10.1115/1.4031759
Published Online: November 17, 2015
View Article titled, Oil Whip Elimination Using Fuzzy Logic Controller
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Topics: Bearings, Control equipment, Fuzzy logic, Rotors, Vibration
Proceedings Papers

Unbalance Response of a Jeffcott Rotor Incorporating Short Squeeze Film Dampers

A. El-Shafei
Proc. ASME. GT1989, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T13A004, June 4–8, 1989
Publisher: American Society of Mechanical Engineers
Paper No: 89-GT-75
https://doi.org/10.1115/89-GT-75
View Paper titled, Unbalance Response of a Jeffcott Rotor Incorporating Short Squeeze Film Dampers
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Topics: Dampers, Rotors, Algorithms, Fluids, Inertia (Mechanics), Springs, Vibration isolation, Excitation, Resonance, Steady state
Proceedings Papers

Experimental and Analytical Investigation of Hybrid Squeeze Film Dampers

A. El-Shafei
Proc. ASME. GT1991, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, V005T14A042, June 3–6, 1991
Publisher: American Society of Mechanical Engineers
Paper No: 91-GT-250
https://doi.org/10.1115/91-GT-250
View Paper titled, Experimental and Analytical Investigation of Hybrid Squeeze Film Dampers
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Topics: Dampers, Flow (Dynamics), Machinery, Vibration, Control equipment, Patents, Rotors, Sealing (Process)
Proceedings Papers

Dynamic Analysis of Squeeze Film Damper Supported Rotors Using Equivalent Linearization

A. El-Shafei, R. V. Eranki
Proc. ASME. GT1993, Volume 2: Combustion and Fuels; Oil and Gas Applications; Cycle Innovations; Heat Transfer; Electric Power; Industrial and Cogeneration; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; IGTI Scholar Award, V002T12A004, May 24–27, 1993
Publisher: American Society of Mechanical Engineers
Paper No: 93-GT-030
https://doi.org/10.1115/93-GT-030
View Paper titled, Dynamic Analysis of Squeeze Film Damper Supported Rotors Using Equivalent Linearization
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Topics: Dampers, Dynamic analysis, Rotors, Computation, Bearings, Design
Proceedings Papers

Development of a Test Rig and Experimental Verification of the Performance of HSFDs for Active Control of Rotors

A. El-Shafei, M. El-Hakim
Proc. ASME. GT1995, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award, V005T14A024, June 5–8, 1995
Publisher: American Society of Mechanical Engineers
Paper No: 95-GT-256
https://doi.org/10.1115/95-GT-256
View Paper titled, Development of a Test Rig and Experimental Verification of the Performance of HSFDs for Active Control of Rotors
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Topics: Rotors, Feedback, Rotor vibration, Computer control, Computers, Control systems, Dampers, Data acquisition, Design, Hydraulic circuits
Proceedings Papers

PI Control of HSFDs for Active Control of Rotor-Bearing Systems

J. P. Hathout, A. El-Shafei
Proc. ASME. GT1996, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T14A018, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-123
https://doi.org/10.1115/96-GT-123
View Paper titled, PI Control of HSFDs for Active Control of Rotor-Bearing Systems
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Topics: Bearings, Rotors, Transients (Dynamics), Closed loop systems, Machinery, Vibration, Vibration control, Blades, Computers, Dampers
Proceedings Papers

Unbalance Response of a Multi-Mode Rotor Supported on Short Squeeze Film Dampers

R. Youssef, A. El-Shafei
Proc. ASME. GT1996, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T14A006, June 10–13, 1996
Publisher: American Society of Mechanical Engineers
Paper No: 96-GT-023
https://doi.org/10.1115/96-GT-023
View Paper titled, Unbalance Response of a Multi-Mode Rotor Supported on Short Squeeze Film Dampers
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Topics: Dampers, Rotors, Algorithms, Differential equations, Polynomials, Steady state, Algebra, Design, Manufacturing, Modal analysis
Proceedings Papers

A Fast Method to Obtain the Nonlinear Response of Multi-Mode Rotors Supported on Squeeze Film Dampers Using Planar Modes: Part I — Theory

R. Y. Yakoub, A. El-Shafei
Proc. ASME. GT1998, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, V005T14A039, June 2–5, 1998
Publisher: American Society of Mechanical Engineers
Paper No: 98-GT-412
https://doi.org/10.1115/98-GT-412
View Paper titled, A Fast Method to Obtain the Nonlinear Response of Multi-Mode Rotors Supported on Squeeze Film Dampers Using Planar Modes: Part I — Theory
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Topics: Dampers, Rotors, Polynomials, Algebra, Differential equations, Eigenvalues, Aircraft, Computers, Design, Gas turbines
Proceedings Papers

A Fast Method to Obtain the Nonlinear Response of Multi-Mode Rotors Supported on Squeeze Film Dampers Using Planar Modes: Part II — Parametric Studies

R. Y. Yakoub, A. El-Shafei
Proc. ASME. GT1998, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, V005T14A040, June 2–5, 1998
Publisher: American Society of Mechanical Engineers
Paper No: 98-GT-413
https://doi.org/10.1115/98-GT-413
View Paper titled, A Fast Method to Obtain the Nonlinear Response of Multi-Mode Rotors Supported on Squeeze Film Dampers Using Planar Modes: Part II — Parametric Studies
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Topics: Dampers, Rotors, Algorithms, Aircraft, Computers, Gas turbines, Modal analysis, Polynomials
Proceedings Papers

Experimental Investigation of Adaptive Control Applied to HSFD Supported Rotors

A. El-Shafei, M. El-Hakim
Proc. ASME. GT1999, Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, V004T03A015, June 7–10, 1999
Publisher: American Society of Mechanical Engineers
Paper No: 99-GT-176
https://doi.org/10.1115/99-GT-176
View Paper titled, Experimental Investigation of Adaptive Control Applied to HSFD Supported Rotors
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Topics: Adaptive control, Rotors, Control equipment, Dampers, Computer control, Design, Engineering simulation, Shorelines, Simulation
Proceedings Papers

Oil Whip Elimination Using Fuzzy Logic Controller

A. S. Dimitri, J. Mahfoud, A. El-Shafei
Proc. ASME. GT2014, Volume 7A: Structures and Dynamics, V07AT31A028, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26619
https://doi.org/10.1115/GT2014-26619
View Paper titled, Oil Whip Elimination Using Fuzzy Logic Controller
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Topics: Control equipment, Fuzzy logic, Bearings, Rotors, Vibration, Control algorithms, Electromagnetic actuators, Engineering prototypes, Geometry, Journal bearings
Proceedings Papers

Active Control Algorithms for the Control of Rotor Vibrations Using HSFDs

A. El-Shafei
Proc. ASME. GT2000, Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, V004T03A072, May 8–11, 2000
Publisher: American Society of Mechanical Engineers
Paper No: 2000-GT-0564
https://doi.org/10.1115/2000-GT-0564
View Paper titled, Active Control Algorithms for the Control of Rotor Vibrations Using HSFDs
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Topics: Control algorithms, Rotor vibration, Control equipment, Gain scheduling, Rotors, Vibration, Dampers, Machinery
Proceedings Papers

Optimum Design of Squeeze Film Dampers Supporting Multiple-Mode Rotors

A. El-Shafei, R. Y. Yakoub
Proc. ASME. GT2001, Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award, V004T03A022, June 4–7, 2001
Publisher: American Society of Mechanical Engineers
Paper No: 2001-GT-0256
https://doi.org/10.1115/2001-GT-0256
View Paper titled, Optimum Design of Squeeze Film Dampers Supporting Multiple-Mode Rotors
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Topics: Dampers, Design, Rotors, Aircraft engines, Algorithms, Clearances (Engineering), Optimization, Springs, Stiffness
Journal Articles

Controlling Journal Bearing Instability Using Active Magnetic Bearings

A. El-Shafei, A. S. Dimitri
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research Papers
J. Eng. Gas Turbines Power. January 2010, 132(1): 012502.
https://doi.org/10.1115/1.3078785
Published Online: September 29, 2009
View Article titled, Controlling Journal Bearing Instability Using Active Magnetic Bearings
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Topics: Control equipment, Damping, Feedback, Journal bearings, Magnetic bearings, Rotors, Bearings
Proceedings Papers

Controlling Journal Bearing Instability Using Active Magnetic Bearings

A. El-Shafei, A. S. Dimitri
Proc. ASME. GT2007, Volume 5: Turbo Expo 2007, 983-993, May 14–17, 2007
Publisher: American Society of Mechanical Engineers
Paper No: GT2007-28059
https://doi.org/10.1115/GT2007-28059
View Paper titled, Controlling Journal Bearing Instability Using Active Magnetic Bearings
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Topics: Journal bearings, Magnetic bearings, Stress, Bearings, Control equipment, Damping, Load bearing capacity, Rotors, Whirls
Proceedings Papers

Comparison of Neural Network Architectures for Machinery Fault Diagnosis

T. A. F. Hassan, A. El-Shafei, Y. Zeyada, N. Rieger
Proc. ASME. GT2003, Volume 1: Turbo Expo 2003, 415-424, June 16–19, 2003
Publisher: American Society of Mechanical Engineers
Paper No: GT2003-38450
https://doi.org/10.1115/GT2003-38450
View Paper titled, Comparison of Neural Network Architectures for Machinery Fault Diagnosis
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Topics: Architecture, Artificial neural networks, Fault diagnosis, Machinery, Feedforward control, Filters, Self-organization
Proceedings Papers

Rotordynamic Performance of Finite Length Squeeze Film Dampers

A. El-Shafei, A. S. El-Kabbany
Proc. ASME. GT2003, Volume 4: Turbo Expo 2003, 499-507, June 16–19, 2003
Publisher: American Society of Mechanical Engineers
Paper No: GT2003-38457
https://doi.org/10.1115/GT2003-38457
View Paper titled, Rotordynamic Performance of Finite Length Squeeze Film Dampers
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Topics: Dampers, Damping, Rotors, Engineering design processes, Engineering simulation, Resonance, Simulation
Proceedings Papers

Rotor Balancing Without Trial Weights

A. El-Shafei, A. S. El-Kabbany, A. A. Younan
Proc. ASME. GT2002, Volume 4: Turbo Expo 2002, Parts A and B, 1117-1124, June 3–6, 2002
Publisher: American Society of Mechanical Engineers
Paper No: GT2002-30633
https://doi.org/10.1115/GT2002-30633
View Paper titled, Rotor Balancing Without Trial Weights
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Topics: Calibration, Rotor balancing, Rotors, Vibration measurement