Analysis of train performance of heavy haul train passing curve on the long-steep ramp

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (15) : 77-83.

JIANG Li-gan 1 SHI Jin1, 2 Long Xu-you3

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Abstract

The diseases of heavy haul railway happen easily on the long steep downgrade and this is a risk source which endangers the traffic safety. 30t axle-load 10,000t heavy haul train tracked by two locomotives was studied and long train dynamics model was established based on the train longitudinal impulse and vehicle dynamics on the curve. The influence of curve parameters on train operation performance was analyzed when heavy haul train was passing curve on the long steep downgrade under the service braking conditions. The results show that the maximum compression coupler force of the whole train is not consistent with the maximum coupler force of the vehicle on the curve when the heavy train was braked and passing curve on the -13‰ gradient. Coupler force of the forty-eighth vehicle on the curve can reach the maximum when the curve is away from the head car 700m. The longitudinal impulse created by braking can increase the wheel load reduction rate by 72%, the wheel-rail lateral forces by 41% and the derailment coefficient by 27%. This will affect the safety of train operation and performance of the rail service. 800m is suggested to be the minimum curve radius of the long steep downgrade considering the improvement of the operation safety and slowing down the diseases of the curve. The research can provide reference for the design of heavy haul railway.

Key words

heavy haul train / longitudinal dynamics / long steep downgrade / curve / train operation performance

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JIANG Li-gan 1 SHI Jin1, 2 Long Xu-you3. Analysis of train performance of heavy haul train passing curve on the long-steep ramp[J]. Journal of Vibration and Shock, 2017, 36(15): 77-83

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