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基于不明原因列车脱轨机理与运动系统平衡状态稳定性分析的能量增量准则,提出了列车-轨道(桥梁)时变系统横向振动稳定性与失稳临界车速分析方法,确定了系统横向振动最大输入能量及其增量,计算了系统横向振动极限抗力做功及其增量,建立了系统横向振动稳定性评判准则,计算了系统横向振动失稳临界车速。通过算例,计算了高速列车-无砟轨道时变系统横向振动稳定性及控制高速列车安全运行的指标。计算结果表明:高速列车-无砟轨道时变系统横向振动的失稳临界车速为647.3 km.h-1,容许极限车速为517.84 km.h-1,抗脱轨安全度为1.85,因此,高速列车以350 km.h-1的车速在无砟轨道上运行是安全的。
Based on the criterion of energy increment of the train derailment mechanism and stability analysis of the kinematic system with unknown causes, the transverse vibration stability and the critical velocity analysis method of the instability of the train-track (bridge) time-varying system are proposed, and the maximum lateral vibration input Energy and its increment, the calculation of the system lateral resistance ultimate resistance work and its increment, the establishment of a system transverse vibration stability evaluation criteria, the calculation of the system horizontal vibration instability critical speed. Through an example, the stability of high-speed train-ballastless track time-varying system in lateral vibration and the index of controlling the safe operation of high-speed train are calculated. The calculation results show that the critical speed of transverse vibration of high-speed train-ballastless track time-varying system is 647.3 km.h-1, the allowable limit speed is 517.84 km.h-1 and the anti-derailment safety degree is 1.85. Therefore, It is safe to operate on a ballastless track at a speed of 350 km h -1.