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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 8    August 2017

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Dynamic performance of heavy-haul combined train applying emergency braking on straight line
LIU Peng-fei(刘鹏飞)1, 2, WANG Kai-yun(王开云)2

1. School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;
2. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Abstract:A heavy-haul train-track coupled model is developed. Taking the emergency braking of the 2×104 t combined train as example, the train longitudinal impulse, the coupler dynamic behaviors and wheel-rail interactions of vehicles distributing in the different positions are analyzed. The results indicate that under the coupler compressing forces, the couplers of middle locomotives may tilt to the free swing limits, which induces the unidirectional tilt of their connected wagon couplers. Consequently, the coupler longitudinal forces produce the lateral components, and then affect the wheel-rail dynamic interaction. The performance of the middle locomotive and their neighboring freight wagons deteriorate significantly, becoming the most dangerous parts in the combined train. The wagons disconnecting with the locomotives can basically keep their couplers to stabilize in the centering positions, even though the maximum coupler longitudinal force acts on it. And its corresponding running safety also has little changes.

 

Key words: heavy-haul train; longitudinal impulse; vehicle–track coupled dynamics; emergency braking

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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