Critical speed and limit cycles in the empty Y25-freight wagon

Abstract In this research, an empty freight wagon with Y25 bogies have been modelled. Non-linear creep forces with spin moment between wheel and rail have been used, and also all impacts and friction forces have been modelled. Non-linear equations of motion and kinematical constraints have been solv...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part F, Journal of rail and rapid transit Journal of rail and rapid transit, 2006-12, Vol.220 (4), p.347-359
Main Authors: Molatefi, H, Hecht, M, Kadivar, M H
Format: Article
Language:English
Subjects:
Equations of motion
Freight
Freight cars
Hunting
Kinematics
Linear equations
Nonlinear equations
Oscillations
Speed limits
Stiffness
Undercarriages
Vehicles
Velocity
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Summary:Abstract In this research, an empty freight wagon with Y25 bogies have been modelled. Non-linear creep forces with spin moment between wheel and rail have been used, and also all impacts and friction forces have been modelled. Non-linear equations of motion and kinematical constraints have been solved in time domain, and limit cycles, saddle nodes, and critical speeds have been shown. Both primary and secondary hunting can be seen in the responses of the wagons. The relation between frequency of oscillations and speed can be seen, also, there are chaotic oscillations. Results show that stiffness in impacts affects calculation time and limit cycles.
ISSN:0954-4097
2041-3017
DOI:10.1243/09544097JRRT67