不同线路条件对车辆动力学性能的影响

Influence of different line conditions on vehicle dynamic performance

为探查不同曲线半径和线路激励对车辆动力学性能的影响,应用动力学方法建立车辆-轨道系统动力学模型,计算各动力学评价指标的变化情况。研究结果表明:增加曲线半径有利于增加车辆通过曲线的安全性;车辆经过曲线线路连接处时脱轨概率较大,可重点考虑曲线线路连接位置车辆的运行状态;适当增大曲线半径可以减少轮轨间磨耗,有效降低车轮与轨道的磨耗速度;轨道激励变化对车辆临界速度的影响较大,可根据实际运行工况计算最佳临界速度范围。

To explore the influence of different curve radius and line excitation on the vehicle dynamic performance,the dynamic model of vehicle-track system is established using dynamic method,and then the change of each dynamic evaluation index is calculated.The results show that increasing the curve radius is conducive to increasing the safety of vehicles passing through the curve.The derailment probability is high when the vehicle passes through the curve line connection,so the running state of the vehicle at the connection position of the curve line can be mainly considered.The wear between wheel and rail can be reduced by properly increasing the curve radius,and the wear speeds of the wheels and tracks can be reduced effectively.The change of track excitation has great influence on the critical speed of vehicles,and the optimum critical speed range can be calculated according to the actual operating conditions.