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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。
Demonstration of train derailment mechanics train-track (bridge) system of lateral vibration loss stability. Based on the method of increment analysis of system kinematic stability, the incremental criterion of energy increment for transverse vibration stability analysis of train-track (bridge) system is proposed: when the lateral increment of train-rail system is greater than the lateral vibration of system When the maximum input energy increment, the lateral vibration state is stable; on the contrary, the lateral vibration state of the system is unstable; when the two are equal, the lateral vibration state is in the instable criticality state. Based on the above criteria, a method to analyze the critical vehicle speed and the allowable speed limit of the transverse vibration system is proposed, and the feasibility of the method is proved by an example. The above method is used to obtain the critical speed of instability of 607.5km / h and the allowable limit speed of 486km / h for high speed railway slab track, proving that the operation of high speed railway in our country is safe.