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Proceedings Papers

NUCARS Modeling of Locomotive Bogies

Mehdi Ahmadian, Michael W. DeLorenzo
Proc. ASME. IMECE96, Rail Transportation, 49-54, November 17–22, 1996
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1996-0591
https://doi.org/10.1115/IMECE1996-0591
View Paper titled, NUCARS Modeling of Locomotive Bogies
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Topics: Locomotives, Modeling, Railroad passenger cars, Cycles, Engineering standards, Product development, Simulation
Proceedings Papers

The Hopf Bifurcation in a Rail Wheelset With Nonlinear Damping

Shaopu Yang, Mehdi Ahmadian
Proc. ASME. IMECE96, Rail Transportation, 113-120, November 17–22, 1996
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1996-0599
https://doi.org/10.1115/IMECE1996-0599
View Paper titled, The Hopf Bifurcation in a Rail Wheelset With Nonlinear Damping
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Topics: Bifurcation, Damping, Rails, Wheelsets, Limit cycles, Dampers, Hardening, Stability, Vibration, Yaw
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
Publisher: American Society of Mechanical Engineers
Paper No: JRC2022-78233
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

Development of a Mobile Robot System for the Visual Inspection of Railcar Undercarriage Equipment

Michael Molzon, Mehdi Ahmadian
Proc. ASME. JRC2022, 2022 Joint Rail Conference, V001T09A008, April 20–21, 2022
Publisher: American Society of Mechanical Engineers
Paper No: JRC2022-79739
https://doi.org/10.1115/JRC2022-79739
View Paper titled, Development of a Mobile Robot System for the Visual Inspection of Railcar Undercarriage Equipment
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Topics: Mobile robots, Optical quality control, Inspection, Trains, Imaging, Maintenance, Railroads, Vibration, Condition monitoring, Design
Proceedings Papers

Visualization Using Google Earth Engine Coupled With Unsupervised Learning, A Practical Approach to Detecting Track Instability

SayedMohammad Hosseini, Ahmad Radmehr, Mehdi Ahmadian
Proc. ASME. JRC2022, 2022 Joint Rail Conference, V001T09A007, April 20–21, 2022
Publisher: American Society of Mechanical Engineers
Paper No: JRC2022-79557
https://doi.org/10.1115/JRC2022-79557
View Paper titled, Visualization Using Google Earth Engine Coupled With Unsupervised Learning, A Practical Approach to Detecting Track Instability
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Topics: Engines, Inspection, Visualization
Proceedings Papers

A Hybrid Semiactive Control for Secondary Suspension Applications

Mehdi Ahmadian
Proc. ASME. IMECE97, Dynamic Systems and Control, 743-750, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0464
https://doi.org/10.1115/IMECE1997-0464
View Paper titled, A Hybrid Semiactive Control for Secondary Suspension Applications
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Topics: Dampers, Hardware, Hybrid control, Resonance, Simulation results
Proceedings Papers

Effect of Suspension Nonlinearities on Rail Vehicle Bifurcation and Stability

Mehdi Ahmadian, Shaopu Yang
Proc. ASME. IMECE97, Rail Transportation, 97-106, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0598
https://doi.org/10.1115/IMECE1997-0598
View Paper titled, Effect of Suspension Nonlinearities on Rail Vehicle Bifurcation and Stability
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Topics: Bifurcation, Rail vehicles, Stability, Damping, Creep, Trucks, Yaw, Dynamics (Mechanics), Rails, Simulation results
Proceedings Papers

A NUCARS Investigation of the Effect of Pedestal Liner Compliance on Rail Vehicle Hunting

Mehdi Ahmadian
Proc. ASME. IMECE97, Rail Transportation, 107-124, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0599
https://doi.org/10.1115/IMECE1997-0599
View Paper titled, A NUCARS Investigation of the Effect of Pedestal Liner Compliance on Rail Vehicle Hunting
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Topics: Rail vehicles, Design, Locomotives, Simulation models, Railway vehicles, Vehicles
Proceedings Papers

On the Virtues of Steerable Locomotive Bogies

Mehdi Ahmadian
Proc. ASME. IMECE97, Rail Transportation, 125-142, November 16–21, 1997
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1997-0600
https://doi.org/10.1115/IMECE1997-0600
View Paper titled, On the Virtues of Steerable Locomotive Bogies
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Topics: Locomotives, Railroad passenger cars, Railroads, Dynamics (Mechanics), Rails, Railway vehicles, Simulation models, Simulation results, Trucks, Wheels
Proceedings Papers

TRAKVU: A New Tool for Modeling Track Irregularities in NUCARS

Mehdi Ahmadian, Kenneth P. Kramp, Mark A. Dembosky
Proc. ASME. IMECE98, Rail Transportation, 33-37, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-0346
https://doi.org/10.1115/IMECE1998-0346
View Paper titled, TRAKVU: A New Tool for Modeling Track Irregularities in NUCARS
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Topics: Modeling, Dynamic models, Rail vehicles, Vehicles, Dynamic analysis
Proceedings Papers

Application of Impedance Methods for Predicting Vibrations of a Locomotive Cab

Mehdi Ahmadian, Chetran J. Dhruna
Proc. ASME. IMECE98, Rail Transportation, 45-52, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-0348
https://doi.org/10.1115/IMECE1998-0348
View Paper titled, Application of Impedance Methods for Predicting Vibrations of a Locomotive Cab
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Topics: Locomotives, Vibration, Approximation, Data acquisition systems, Vibration isolation, Vibration measurement
Proceedings Papers

Design and Development of Magneto Rheological Dampers for Bicycle Suspensions

Mehdi Ahmadian
Proc. ASME. IMECE99, Dynamic Systems and Control, 737-741, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0101
https://doi.org/10.1115/IMECE1999-0101
View Paper titled, Design and Development of Magneto Rheological Dampers for Bicycle Suspensions
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Topics: Bicycles, Dampers, Design, Rheology, Manufacturing, Retrofitting, Valves, Damping, Fittings, Fluids
Proceedings Papers

Application of Magneto Rheological Dampers for Controlling Shock Loading

Mehdi Ahmadian, James C. Poynor, Jason M. Gooch
Proc. ASME. IMECE99, Dynamic Systems and Control, 731-735, November 14–19, 1999
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1999-0100
https://doi.org/10.1115/IMECE1999-0100
View Paper titled, Application of Magneto Rheological Dampers for Controlling Shock Loading
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Topics: Dampers, Rheology, Shock (Mechanics), Closed loop systems, Damping, Dynamic systems, Dynamics (Mechanics), Shock absorbers
Proceedings Papers

New Technologies for the Railway Industry: Part I

Mehdi Ahmadian, James C. Poynor, Fernando D. Goncalves
Proc. ASME. IMECE2001, Rail Transportation, 201-206, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/RTD-25721
https://doi.org/10.1115/IMECE2001/RTD-25721
View Paper titled, New Technologies for the Railway Industry: Part I
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Topics: Railroads, Rails, Automobiles, Automotive industry, Freight cars, Locomotives, Rheology, Transportation systems
Proceedings Papers

Dynamic Analysis of Semi-Active Tuned Vibration Absorbers Using Closed-Form Equivalent Models

Jeong-Hoi Koo, Mehdi Ahmadian
Proc. ASME. IMECE2001, Vibration and Control of Mechanical Systems, 31-37, November 11–16, 2001
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2001/DE-23204
https://doi.org/10.1115/IMECE2001/DE-23204
View Paper titled, Dynamic Analysis of Semi-Active Tuned Vibration Absorbers Using Closed-Form Equivalent Models
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Topics: Dynamic analysis, Vibration absorbers, Damping, Dampers, Resonance, Vibration, Rheology
Proceedings Papers

Intermediate Distance Testing of Optical Top-of-Rail (TOR) Lubricity Sensors on a Remote-Controlled Rail Cart

Timothy Mast, Yu Pan, Carvel Holton, Mehdi Ahmadian
Proc. ASME. JRC2021, 2021 Joint Rail Conference, V001T01A002, April 20–21, 2021
Publisher: American Society of Mechanical Engineers
Paper No: JRC2021-58347
https://doi.org/10.1115/JRC2021-58347
View Paper titled, Intermediate Distance Testing of Optical Top-of-Rail (TOR) Lubricity Sensors on a Remote-Controlled Rail Cart
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Topics: Friction, Lasers, Railroads, Rails, Sensors, Testing
Proceedings Papers

Performance Evaluation of a Novel Optical Sensing System for Detecting Rail Lubricity Conditions

Yu Pan, Timothy Mast, Carvel Holton, Mehdi Ahmadian
Proc. ASME. JRC2021, 2021 Joint Rail Conference, V001T12A003, April 20–21, 2021
Publisher: American Society of Mechanical Engineers
Paper No: JRC2021-58435
https://doi.org/10.1115/JRC2021-58435
View Paper titled, Performance Evaluation of a Novel Optical Sensing System for Detecting Rail Lubricity Conditions
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Topics: Flanges, Friction, Performance evaluation, Rails
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
Publisher: American Society of Mechanical Engineers
Paper No: JRC2021-58381
https://doi.org/10.1115/JRC2021-58381
View Paper titled, A Statistical Approach to Evaluating Wheel-Rail Contact Dynamics
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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
Publisher: American Society of Mechanical Engineers
Paper No: JRC2021-58433
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
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Topics: Friction, Rails, Rollers, Traction, Wear, Wheels
Proceedings Papers

Semiactive Control of Multiple Degree of Freedom Systems

Mehdi Ahmadian
Proc. ASME. DETC97, Volume 1A: 16th Biennial Conference on Mechanical Vibration and Noise, V01AT04A008, September 14–17, 1997
Publisher: American Society of Mechanical Engineers
Paper No: DETC97/VIB-4123
https://doi.org/10.1115/DETC97/VIB-4123
View Paper titled, Semiactive Control of Multiple Degree of Freedom Systems
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Topics: Degrees of freedom, Dampers, Resonance, Engineering simulation, Hardware, Hybrid control, Simulation, Vehicles