列尾装置对重载列车纵向力的影响

根据气体流动理论与多刚体动力学原理, 建立了带有列尾装置的列车空气制动系统与列车纵向动力学联合仿真模型, 计算了制动系统中空气流动瞬态数值解, 获得制动系统特性, 同步计算了列车纵向冲动。2万吨组合列车计算结果表明:全制动时安装列尾装置使最大车钩力降低54%, 列车纵向冲动明显降低;列尾装置减压量越大, 车钩力降低越明显, 目前列尾装置减压量固定为50kPa, 应根据线路经常使用的减压量确定更合理的值;列尾装置排气速度对车钩力影响较小;列尾装置滞后时间对车钩力影响微小;使用机车替代列尾装置, 在大减压量制动时, 车钩力将明显得到改善, 减压量越小, 机车与列尾装置作用效果越接近, 当机车减压50kPa制动时, 列尾装置与机车作用相同。

Influence of train tail exhaust device on longitudinal force of train

Based on airflow theory and multi-rigid dynamics, a train combined simulation model of longitudinal dynamics and air brake system with train tail exhaust device was established, the transient numerical solution of airflow in the brake system was calculated, the performance of brake system was obtained, and train longitudinal dynamics was simulated synchronously. Simulation result shows that for 20 000 t train, tail exhaust device can reduce the maximum coupler force by 54% at full application brake, which is more obvious. The greater the pressure reduction of brake pipe is, the smaller the coupler force is. Now the fixed pressure reduction in tail exhaust device is 50 kPa, and it should be modified according to the common pressure reduction. The exhaust speed and lag time of tail exhaust device have little effect on train coupler force. When tail exhaust device is replaced with locomotive, the coupler force reduces under full service application, the greater the reduction of service application is, the greater the difference between locomotive and tail exhaust device is. When the reduction is 50 kPa, there is no difference between locomotive and tail exhaust device.