中文摘要：

基于CRTSⅡ型板式无砟轨道关键参数对行车安全的影响,指导轨道结构的优化,利用有限元方法和轮轨系统耦合动力学原理,建立车辆-轨道-路基系统垂向耦合动力学模型,研究轨道结构关键参数对列车的振动特性和轮轨垂向作用力的影响规律。研究结果表明：轨道板厚度对行车平稳性基本无影响;当扣件刚度从20 kN/mm增加到100 kN/mm时,轮对和转向架的振动加速度分别增加43.94%和7.98%,轮轨垂向力增加29.83%;扣件阻尼从20 kN·s/m增大到100 kN·s/m时,轮对和转向架的振动加速度分别减小21.64%和7.09%,轮轨垂向力减小9.48%,车体变化不大;为保证行车的安全性和平稳性,扣件阻尼和混凝土支承层厚度应尽可能取较大值。

英文摘要：

To study the influence of the key parameters of China railway track systemⅡ slab track on the running safety and instruct the optimization of track structure,a dynamic computational model of vehicle-track-subgrade coupling system was established by means of finite element method and the wheel /rail system coupling dynamic theory. The effects of the key parameters of track on vibration of vehicle and wheel-rail vertical force were studied. Results show that the thickness of slab has negligible impact on the stability of driving. The vibration acceleration of wheel set and bogie increase by 43. 94% and by 7. 98% respectively,and the wheel-rail vertical force rises by 29. 83% when the fastener stiffness increases from 20 kN /mm to 100 kN /mm. While the vibration acceleration of wheel set and bogie reduce by 21. 64% and by 7. 09% respectively,and the wheel-rail vertical force drops by 9. 48% with little change of the car-body when the fastener damping rises from 20kN·s /m to 100 kN·s /m. In order to ensure the running safety and stability of vehicle,it is highly suggested that the bigger damping value of fastener and greater thickness of concrete supporting layer should be selected.