制动特性对列车纵向冲动的影响

针对大秦线重载列车实际运用中出现的纵向冲动过大的问题,使用基于气体流动理论的空气制动特性仿真和基于刚体动力学的列车纵向动力学联合仿真方法,研究制动波传播的均匀性、制动波速、制动缸升压特性等制动系统特性对纵向冲动的影响.结果表明在制动波速不变条件下,制动波匀速传播与非匀速传播时列车纵向冲动水平基本一致；制动波速对列车车钩力影响显著,波速越高,车钩力越小；在列车制动能力不变的条件下,随着列车首尾车制动缸压强曲线开口度的收敛,纵向冲动明显降低,最大车钩力发生位置向列车后部移动.

Influence of Brake Characteristics on Longitudinal Impulse of Train

Referring to excessive longitudinal impulse of Da-Qin heavy haul trains in practice,co-simulation of air braking characteristics based on gas flow theory and train longitudinal dynamics based on rigid body kinetics are used to study the effects of braking system characteristics(uniformity of brake propagation,brake propagation speed and pressure increasing speed of brake cylinder,etc.)on longitudinal impulse.The results show that under the conditions of same brake propagation speed,train longitudinal impulse of uniform and non-uniform brake propagation are basically consistent,and brake propagation speed affects coupler force significantly.The faster the brake speed is,the smaller the coupler force is.Under the conditions of same stopping distance with the convergence of front and rear vehicle′s brake cylinder pressure curves,longitudinal impulse is reduced significantly,and the locations of maximum coupler force are moved towards the rear of train.