高速铁路缓和曲线行车动力性能对比分析

针对三次抛物线、半波正弦和一波正弦3种线型的铁路缓和曲线，以不同的列车运行速度变化规律建立了3种不同的分析工况，理论计算了车体横向加速度时变率。利用铁道车辆系统动力学数值仿真软件，建立了具有93个自由度的单节高速车模型，同时考虑轨道不平顺的影响，仿真计算了车体横向加速度时变率，对比分析了3种不同工况下缓和曲线上车体横向加速度时变率的变化情况。结果表明，在未考虑轨道不平顺时，列车以变化的速度运行，半波正弦更具优势，在车站两端加减速地段可以考虑采用半波正弦型缓和曲线，以提高旅客乘坐舒适度：轨道不平顺对高速行车的安全性和平稳性影响很大，应严格控制轨道平顺性。

Comparative Analysis of Dynamic Behavior of High-speed Railway Transition Curves

The lateral changes of carbody acceleration of cubic parabola, half-wave sinusoidal and sinusoidal transition curves are theoretically calculated in three-different motion models established based on the change regularity of vehicle velocity. A high-speed passenger vehicle model with 93 degrees of freedom is established by adopting the rail/vehicle system dynamics numerical software. The lateral changes of carbody acceleration of three transition curves are simulated in three-different motion models taking into account the railway track irregu- larities, and then the theoretical results and simulation of the lateral changes of the carbody acceleration in threedifferent motion models are compared and analyzed. The results show that the half-wave sinusoidal transition curve is superior to the other by taking into account the motions with positive or negative acceleration when there is no railway track irregularities, and in order to improve passengers comfort, the half-wave sinusoidal transition curve should be used at both ends of the station area where the vehicle motions with acceleration. The railway track irregularity has a bad effect on the safety and running stability of train, so the high speed railway track ride must be strictly controlled.