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 interaction...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.展开更多
基金Projects(51605315,51478399)supported by the National Natural Science Foundation of ChinaProject(2013BAG20B00)supported by the National Key Technology R&D Program of ChinaProject(TPL1707)supported by the Open Project Program of the State Key Laboratory of Traction Power,China
文摘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.
文摘为提升超导电动悬浮列车(EDS)在侧向通过道岔时的速度,本文基于多体动力学理论与运动微分方程,建立超导EDS磁浮列车-道岔耦合动力学模型.首先,通过分析不同道岔梁长度对车辆动力响应的影响,确定最优道岔梁长度,并设计相应的磁浮单开道岔线形;在此基础上,进一步研究不同侧向过岔速度下的动力学响应特性,明确满足乘客舒适度和行车安全性的侧向过岔速度临界值.研究表明:较短的道岔梁长度与较低的通过速度可扩大系统稳定区域,减少悬浮和导向间隙波动,提升乘坐舒适度和行车平稳性;列车以100 km/h的速度侧向通过道岔梁长度为8 m的道岔线形,动力响应最佳,满足乘客舒适度要求,侧向过岔速度可达130 km/h,比现有磁浮列车的最高速度提升了85%;随着侧向过岔速度的增加,道岔线形对磁悬浮列车行车安全性和乘坐舒适度的影响愈加显著,车辆动力响应更加明显,侧向安全过岔速度的临界值为150 km/h.
