列车-轨道(桥梁)系统横向振动稳定性分析

论证列车脱轨力学机理是列车-轨道(桥梁)系统横向振动丧失稳定。基于系统运动稳定性能量增量分析方法,提出列车-轨道(桥梁)系统横向振动稳定性分析的能量增量判别准则:当列车-轨道(桥梁)系统横向振动极限抗力做功增量大于系统横向振动最大输入能量增量时,横向振动状态稳定;反之,系统横向振动状态不稳定;二者相等时,横向振动状态处于失稳临界状态。基于上述准则,提出系统横向振动失稳临界车速与容许极限车速分析方法,并结合实例证明方法的可行性。采用上述方法得到高速铁路板式无砟轨道列车失稳临界车速为607.5km/h,容许极限车速为486km/h,证明我国高速铁路运行安全度较高。

Study on Stability of Lateral Vibration of Train-track( bridge) System

The mechanism of train derailment was demonstrated to be unstability of lateral movement of train-track(bridge) system.On the basis of the energy increment method for stability analysis of system movement,the energy increment discrimination criteria were presented for judging the stability of lateral vibration of the train-track(bridge) system.The main content of the criteria is as follows: If the amount of work increment of ultimate resisting forces exceeds the maximum input energy increment,the lateral vibration is stable,when the former is less than the latter,the lateral vibration becomes unstable.In particular,a critical state can be reached when the two quantities equal in magnitude.In accordance with the above criteria,the method for analyzing the critical train speed due to lateral vibration unstability of the system and the permissible train speed was presented.It is manifested that the method of analyzing the critical train speed is reasonable.The critical speed and permissible speed of train on ballastless tracks of high-speed railways are calculated as 607.5 km/h and 486 km/h respectively,which illustrate the high running safety of high-speed trains in China.