The majority of studies of rail vehicle lateral dynamic response have utilized models wherein it is assumed that the loading and geometry of the vehicles are symmetrical left and right and fore and aft. It has been observed that with use North American rail freight vehicles develop transverse wheel profiles that may be different for wheels on a given axle and that may also differ from axle to axle on a given vehicle. As the transverse wheel profiles exert a strong influence on lateral dynamic response by affecting the effective conicity and gravitational stiffness of the wheelset, models capable of having different wheel profiles on the same axle as well as on different axles were developed to investigate the stability behavior. Additionally, these models were formulated so that the effects on stability of asymmetric fore and aft loading conditions, as manifested through gravitational stiffness effects and creep coefficients, could be examined. Results of studies using these models are presented that display characteristics markedly different from those of completely symmetric models. A particularly interesting result is that, in most cases, the lateral stability of vehicles with different wheel profiles on the various axles is strongly sensitive to the direction of motion with results for each direction of motion which may differ radically from symmetric cases.
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February 1979
This article was originally published in
Journal of Engineering for Industry
Research Papers
Lateral Stability of Freight Cars With Axles Having Different Wheel Profiles and Asymmetric Loading
J. M. Tuten,
J. M. Tuten
Department of Mechanical Engineering, Clemson University, Clemson, S. C.
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E. H. Law,
E. H. Law
Department of Mechanical Engineering, Clemson University, Clemson, S. C.
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N. K. Cooperrider
N. K. Cooperrider
Department of Mechanical Engineering, Arizona State University, Tempe, Ariz.
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J. M. Tuten
Department of Mechanical Engineering, Clemson University, Clemson, S. C.
E. H. Law
Department of Mechanical Engineering, Clemson University, Clemson, S. C.
N. K. Cooperrider
Department of Mechanical Engineering, Arizona State University, Tempe, Ariz.
J. Eng. Ind. Feb 1979, 101(1): 1-16
Published Online: February 1, 1979
Article history
Received:
December 27, 1977
Online:
July 15, 2010
Citation
Tuten, J. M., Law, E. H., and Cooperrider, N. K. (February 1, 1979). "Lateral Stability of Freight Cars With Axles Having Different Wheel Profiles and Asymmetric Loading." ASME. J. Eng. Ind. February 1979; 101(1): 1–16. https://doi.org/10.1115/1.3439469
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