弹性支承块式无砟轨道结构参数动力学优化设计

建立车辆-弹性支承块式无砟轨道耦合动力学模型。模拟落轴试验荷载条件,分析轨下刚度与块下刚度的匹配关系,得出轨下刚度与块下刚度的合理取值范围。在轨道刚度确定的前提下,提出不同运营条件下满足动态轨距扩大限值的弹性支承块式无砟轨道合理结构参数。评估不同半径曲线上铺设弹性支承块式无砟轨道时重载货车和快速客车的运行安全性和舒适性。研究隧道内弹性支承块式无砟轨道与隧道外有砟轨道过渡段动力学问题,结果表明:将有砟轨道向隧道内延伸一定长度可明显改善连接处轨枕的受力状况,同时使支承块免受雨水侵蚀。延伸段长度以10～20 m为宜。

Dynamic Optimization Design of the Structural Parameters of Low Vibration Track

The coupled dynamic model of train and low vibration track(LVT) is established.By simulating the loading condition of the falling wheelset test,the matching relationship between the stiffness under the rail and the stiffness under the concrete block is studied and the reasonable ranges of the stiffness under the rail and the stiffness under the block are determined.Under the premise that the track stiffness is given,the reasonable structural parameters of LVT within the dynamic gauge widening limit are obtained in different operation conditions.Safety and comfort of the heavy haul freight train and express passenger train traffic are evaluated for different radius curves laid with LVT.The dynamic performance of the transition section between the LVT inside a tunnel and the ballast track outside a tunnel is studied.The results show that extending the ballast track into the tunnel by a certain length can significantly reduce the force acting upon the sleepers at the junction and can also protect the LVT bearing blocks against rainwater erosion,the optimal extended length is 10～20 m.