In this study, the nonlinear damping characteristics of friction wedges in the secondary suspension of a freight truck are investigated considering non-smooth contact, geometry, loss of contact and multi-axis motions. The friction wedge model is integrated to a nonlinear multi-body dynamic model of a three-piece truck to study its hunting characteristics. The 114-degrees-of-freedom model also integrates constraints due to side bearings, axle boxes and center plates, while the wheel/rail contact forces are obtained using FASTSIM algorithm considering non-elliptical contact. The parameters of contact pairs within the suspension are identified to achieve smooth and efficient numerical solutions, while ensuring adequate accuracy. The simulation results are presented to illustrate the hunting properties of the truck in terms of critical speed and oscillation frequency. The results showed subcritical Hopf-bifurcation in the lateral dynamic responses.
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ASME 2014 International Mechanical Engineering Congress and Exposition
November 14–20, 2014
Montreal, Quebec, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4961-3
PROCEEDINGS PAPER
Hunting Characteristics of a Freight Car in Presence of Secondary Suspension Non-Smooth Contact Dynamics Available to Purchase
Iman Hazrati Ashtiani,
Iman Hazrati Ashtiani
Concordia University, Montreal, QC, Canada
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A. K. W. Ahmed,
A. K. W. Ahmed
Concordia University, Montreal, QC, Canada
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Subhash Rakheja,
Subhash Rakheja
Concordia University, Montreal, QC, Canada
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Jimin Zhang
Jimin Zhang
Tongji University, Shanghai, China
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Iman Hazrati Ashtiani
Concordia University, Montreal, QC, Canada
A. K. W. Ahmed
Concordia University, Montreal, QC, Canada
Subhash Rakheja
Concordia University, Montreal, QC, Canada
Jimin Zhang
Tongji University, Shanghai, China
Paper No:
IMECE2014-38960, V012T15A038; 8 pages
Published Online:
March 13, 2015
Citation
Ashtiani, IH, Ahmed, AKW, Rakheja, S, & Zhang, J. "Hunting Characteristics of a Freight Car in Presence of Secondary Suspension Non-Smooth Contact Dynamics." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 12: Transportation Systems. Montreal, Quebec, Canada. November 14–20, 2014. V012T15A038. ASME. https://doi.org/10.1115/IMECE2014-38960
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