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Ali Tajaddini
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Proceedings Papers

Wheel-Rail Contact Force and Traction Analysis Under Wet and Oil-Contaminated Conditions

Ahmad Radmehr, Yu Pan, Ali Tajaddini, Edwin Vollebregt, Mehdi Ahmadian
Proc. ASME. JRC2022, 2022 Joint Rail Conference, V001T07A002, April 20–21, 2022
Paper No: JRC2022-78233
DOI: https://doi.org/10.1115/JRC2022-78233
View Paper titled, Wheel-Rail Contact Force and Traction Analysis Under Wet and Oil-Contaminated Conditions
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Topics: Rails, Rollers, Traction, Water, Wheels
Proceedings Papers

A Statistical Approach to Evaluating Wheel-Rail Contact Dynamics

Sayedmohammad Hosseini, Arash Hosseinian Ahangarnejad, Ahmad Radmehr, Ali Tajaddini, Mehdi Ahmadian
Proc. ASME. JRC2021, 2021 Joint Rail Conference, V001T10A002, April 20–21, 2021
Paper No: JRC2021-58381
DOI: https://doi.org/10.1115/JRC2021-58381
View Paper titled, A Statistical Approach to Evaluating Wheel-Rail Contact Dynamics
Click here to open pdf in another window PDF for A Statistical Approach to Evaluating Wheel-Rail Contact Dynamics
Topics: Contact dynamics, Rails, Stress, Traction, Wheels
Proceedings Papers

An Experimental Study of the Influence of the Amount of Top-Of-Rail Friction Modifiers on Traction

Yu Pan, Ahmad Radmehr, Ali Tajaddini, Mehdi Ahmadian
Proc. ASME. JRC2021, 2021 Joint Rail Conference, V001T10A003, April 20–21, 2021
Paper No: JRC2021-58433
DOI: https://doi.org/10.1115/JRC2021-58433
View Paper titled, An Experimental Study of the Influence of the Amount of Top-Of-Rail Friction Modifiers on Traction
Click here to open pdf in another window PDF for An Experimental Study of the Influence of the Amount of Top-Of-Rail Friction Modifiers on Traction
Topics: Friction, Rails, Rollers, Traction, Wear, Wheels
Proceedings Papers

Wheel-Rail Contact Patch Geometry Measurement and Shape Analysis Under Various Loading Conditions

Ahmad Radmehr, Arash Hosseinian Ahangarnejad, Yu Pan, SayedMohammad Hosseini, Ali Tajaddini, Mehdi Ahmadian
Proc. ASME. JRC2020, 2020 Joint Rail Conference, V001T13A005, April 20–22, 2020
Paper No: JRC2020-8042
DOI: https://doi.org/10.1115/JRC2020-8042
View Paper titled, Wheel-Rail Contact Patch Geometry Measurement and Shape Analysis Under Various Loading Conditions
Click here to open pdf in another window PDF for Wheel-Rail Contact Patch Geometry Measurement and Shape Analysis Under Various Loading Conditions
Topics: Geometry, Pressure, Rails, Rollers, Shapes, Wheels
Proceedings Papers

Assessing Derailment Potential of Partially Filled Railroad Tank Cars

Mark Hunter, Brian Marquis, Robert Greif, Ali Tajaddini
Proc. ASME. JRC2020, 2020 Joint Rail Conference, V001T13A002, April 20–22, 2020
Paper No: JRC2020-8038
DOI: https://doi.org/10.1115/JRC2020-8038
View Paper titled, Assessing Derailment Potential of Partially Filled Railroad Tank Cars
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Topics: Railway tank cars, Fluids, Safety, Accidents, Computational fluid dynamics, Dynamic modeling, Dynamic models, Pendulums, Sloshing, Trains
Proceedings Papers

Investigating the Influence of Angle of Attack (Yaw) on Wheel-Rail Interface (WRI) Dynamics

Ahmad Radmehr, Arash Hosseinian Ahangarnejad, Ali Tajaddini, Mehdi Ahmadian
Proc. ASME. JRC2020, 2020 Joint Rail Conference, V001T13A003, April 20–22, 2020
Paper No: JRC2020-8040
DOI: https://doi.org/10.1115/JRC2020-8040
View Paper titled, Investigating the Influence of Angle of Attack (Yaw) on Wheel-Rail Interface (WRI) Dynamics
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Topics: Dynamics (Mechanics), Rails, Rollers, Wheels, Yaw
Proceedings Papers

Surface Profile and Third-Body Layer Accumulation Measurement Using a 3D Laser Profiler

Ahmad Radmehr, Arash Hosseinian Ahangarnejad, Ali Tajaddini, Mehdi Ahmadian
Proc. ASME. JRC2020, 2020 Joint Rail Conference, V001T13A004, April 20–22, 2020
Paper No: JRC2020-8041
DOI: https://doi.org/10.1115/JRC2020-8041
View Paper titled, Surface Profile and Third-Body Layer Accumulation Measurement Using a 3D Laser Profiler
Click here to open pdf in another window PDF for Surface Profile and Third-Body Layer Accumulation Measurement Using a 3D Laser Profiler
Topics: Finishes, Lasers, Rails, Rollers, Surface roughness, Wheels, Traction, Wear, Stress, Dust
Proceedings Papers

Virginia Tech-Federal Railroad Administration Roller Rig Measurement Capabilities and Baseline Measurements

Ahmad Radmehr, Ali Tajaddini, Brian Marquis, Mehdi Ahmadian
Proc. ASME. JRC2019, 2019 Joint Rail Conference, V001T10A005, April 9–12, 2019
Paper No: JRC2019-1295
DOI: https://doi.org/10.1115/JRC2019-1295
View Paper titled, Virginia Tech-Federal Railroad Administration Roller Rig Measurement Capabilities and Baseline Measurements
Click here to open pdf in another window PDF for Virginia Tech-Federal Railroad Administration Roller Rig Measurement Capabilities and Baseline Measurements
Topics: Railroads, Rollers, Rails, Wheels, Contact mechanics, Dynamics (Mechanics), Experimental design, Testing
Proceedings Papers

Passenger Vehicle Characterization, Modeling, Validation, and Sensitivity Analysis

Adam Klopp, Jack Schultz, Ali Tajaddini
Proc. ASME. JRC2018, 2018 Joint Rail Conference, V001T10A004, April 18–20, 2018
Paper No: JRC2018-6194
DOI: https://doi.org/10.1115/JRC2018-6194
View Paper titled, Passenger Vehicle Characterization, Modeling, Validation, and Sensitivity Analysis
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Topics: Modeling, Sensitivity analysis, Vehicles, Model validation, Testing, Geometry, Transportation systems, Computer software, Damping, Displacement
Proceedings Papers

Vehicle Track Interaction Safety Standards

Brian Marquis, Jon LeBlanc, Ali Tajaddini
Proc. ASME. JRC2014, 2014 Joint Rail Conference, V001T02A016, April 2–4, 2014
Paper No: JRC2014-3872
DOI: https://doi.org/10.1115/JRC2014-3872
View Paper titled, Vehicle Track Interaction Safety Standards
Click here to open pdf in another window PDF for Vehicle Track Interaction Safety Standards
Topics: Safety, Vehicles, Design, Geometry, Rail vehicles, Railroads, Wheels, Accidents, China, Computer simulation
Proceedings Papers

Engineering Studies on Joint Bar Integrity: Part I — Field Surveys and Observed Failure Modes

David Y. Jeong, Radim Bruzek, Ali Tajaddini
Proc. ASME. JRC2014, 2014 Joint Rail Conference, V001T01A001, April 2–4, 2014
Paper No: JRC2014-3706
DOI: https://doi.org/10.1115/JRC2014-3706
View Paper titled, Engineering Studies on Joint Bar Integrity: Part I — Field Surveys and Observed Failure Modes
Click here to open pdf in another window PDF for Engineering Studies on Joint Bar Integrity: Part I — Field Surveys and Observed Failure Modes
Topics: Failure mechanisms, Finite element analysis, Inspection, Railroads, Rails, Teams, Transportation systems
Proceedings Papers

Wheel-Rail Contact Characteristics on a Tangent Track Vs a Roller Rig

Alexander Keylin, Mehdi Ahmadian, Mehdi Taheri, Ali Tajaddini
Proc. ASME. RTDF2012, ASME 2012 Rail Transportation Division Fall Technical Conference, 1-9, October 16–18, 2012
Paper No: RTDF2012-9406
DOI: https://doi.org/10.1115/RTDF2012-9406
View Paper titled, Wheel-Rail Contact Characteristics on a Tangent Track Vs a Roller Rig
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Topics: Rails, Rollers, Wheels, Contact mechanics, Dynamics (Mechanics), Dimensions, Rail wheels, Testing, Traction
Proceedings Papers

Examination of Vehicle Performance at High Speed and High Cant Deficiency

Brian Marquis, Jon LeBlanc, Ali Tajaddini
Proc. ASME. JRC2011, 2011 Joint Rail Conference, 281-289, March 16–18, 2011
Paper No: JRC2011-56066
DOI: https://doi.org/10.1115/JRC2011-56066
View Paper titled, Examination of Vehicle Performance at High Speed and High Cant Deficiency
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Topics: Vehicles, Automotive design, Design, Geometry, High speed rail, Maintenance, Rail vehicles, Railroad passenger cars, Railroads, Safety
Proceedings Papers

Optimizing Wheel/Rail Performance on High Speed, Mixed Traffic Corridors

Eric E. Magel, Brian Helfrich, Ali Tajaddini
Proc. ASME. JRC2010, 2010 Joint Rail Conference, Volume 2, 165-172, April 27–29, 2010
Paper No: JRC2010-36155
DOI: https://doi.org/10.1115/JRC2010-36155
View Paper titled, Optimizing Wheel/Rail Performance on High Speed, Mixed Traffic Corridors
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Topics: Rails, Traffic, Wheels, Friction, Grinding, Optimization, Railroads
Proceedings Papers

A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 2—Preliminary Validation of BETA Release

Brian Marquis, Erik Curtis, Khaled E. Zaazaa, Brian Whitten, Magdy El-Sibaie, Ali Tajaddini
Proc. ASME. JRC2009, 2009 Joint Rail Conference, 145-154, March 4–5, 2009
Paper No: JRC2009-63044
DOI: https://doi.org/10.1115/JRC2009-63044
View Paper titled, A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 2—Preliminary Validation of BETA Release
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Topics: Computer software, Dynamics (Mechanics), Rail vehicles, Rails, Railroads, Vehicles, Simulation, Modeling, Multibody systems, Performance evaluation
Proceedings Papers

A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 1—Theory and Formulations

Khaled E. Zaazaa, Brian Whitten, Brian Marquis, Erik Curtis, Magdy El-Sibaie, Ali Tajaddini, Ahmed A. Shabana
Proc. ASME. JRC2009, 2009 Joint Rail Conference, 155-164, March 4–5, 2009
Paper No: JRC2009-63045
DOI: https://doi.org/10.1115/JRC2009-63045
View Paper titled, A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 1—Theory and Formulations
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Topics: Computer software, Dynamics (Mechanics), Rail vehicles, Rails, Wheels, Simulation, Railroads, Industrial research, Multibody systems, Separation (Technology)
Proceedings Papers

A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 3—Applications to Predict Railroad Vehicle-Track Interaction Performance

Khaled E. Zaazaa, Timothy P. Martin, Brian Whitten, Brian Marquis, Erik Curtis, Magdy El-Sibaie, Ali Tajaddini
Proc. ASME. JRC2009, 2009 Joint Rail Conference, 165-173, March 4–5, 2009
Paper No: JRC2009-63046
DOI: https://doi.org/10.1115/JRC2009-63046
View Paper titled, A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 3—Applications to Predict Railroad Vehicle-Track Interaction Performance
Click here to open pdf in another window PDF for A Nonlinear Rail Vehicle Dynamics Computer Program SAMS/Rail: Part 3—Applications to Predict Railroad Vehicle-Track Interaction Performance
Topics: Computer software, Dynamics (Mechanics), Rail vehicles, Railroads, Rails, Vehicles, Artificial neural networks, Wheels, Simulation, Dynamic response
Proceedings Papers

A Machine Vision System for Automated Joint Bar Inspection From a Moving Rail Vehicle

Xavier Gibert-Serra, Andrea Berry, Christian Diaz, William Jordan, Boris Nejikovsky, Ali Tajaddini
Proc. ASME. JRC-ICE2007, ASME/IEEE 2007 Joint Rail Conference and Internal Combustion Engine Division Spring Technical Conference, 289-296, March 13–16, 2007
Paper No: JRC/ICE2007-40039
DOI: https://doi.org/10.1115/JRC/ICE2007-40039
View Paper titled, A Machine Vision System for Automated Joint Bar Inspection From a Moving Rail Vehicle
Click here to open pdf in another window PDF for A Machine Vision System for Automated Joint Bar Inspection From a Moving Rail Vehicle
Topics: Inspection, Machinery, Rail vehicles, Railroads, Rails, Safety, Computers, Failure, Fatigue cracks, Flaw detection
Proceedings Papers

Using a Multibody Dynamic Simulation Code With Neural Network Technology to Predict Railroad Vehicle-Track Interaction Performance in Real Time

Timothy P. Martin, Khaled E. Zaazaa, Brian Whitten, Ali Tajaddini
Proc. ASME. IDETC-CIE2007, Volume 5: 6th International Conference on Multibody Systems, Nonlinear Dynamics, and Control, Parts A, B, and C, 1881-1891, September 4–7, 2007
Paper No: DETC2007-34859
DOI: https://doi.org/10.1115/DETC2007-34859
View Paper titled, Using a Multibody Dynamic Simulation Code With Neural Network Technology to Predict Railroad Vehicle-Track Interaction Performance in Real Time
Click here to open pdf in another window PDF for Using a Multibody Dynamic Simulation Code With Neural Network Technology to Predict Railroad Vehicle-Track Interaction Performance in Real Time
Topics: Artificial neural networks, Railroads, Simulation, Vehicles, Geometry, Nonlinear equations, Approximation, Computation, Instrumentation, Rails