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依据系统工程理论的思想,建立列车无砟轨道结构耦合系统的有限元模型,对客运专线土质路基上板式、双块式无砟轨道结构和普通碎石道床轨道结构在高速行车条件下的耦合系统动力学性能进行了仿真分析研究。对比分析这3种类型的轨道结构系统振动响应与系统振动传递函数,评价无砟轨道结构的振动特性。结果表明:无砟轨道结构的平顺性很好;结构各部分的振动随着列车行驶速度的增大而增大;钢轨、道床板、路基的主要振动频带范围均随着列车行驶速度的增大而增大;有砟轨道的弹性最好,板式无砟轨道的弹性次之,双块式无砟轨道的弹性较差。
According to the theory of system engineering, the finite element model of the coupling system of the ballastless track structure is established. The coupling system of the ballastless track structure on the passenger dedicated railway with the slab track, double block ballastless track structure and ordinary ballasted track bed structure under high speed driving condition is established. Dynamic performance of the simulation analysis. The vibration responses and the system vibration transfer functions of the three types of orbital structures are compared and analyzed to evaluate the vibration characteristics of the ballasted structure. The results show that the smoothness of the ballastless track structure is very good. The vibration of various parts of the structure increases with the train speed increasing. The main vibration frequency bands of the rail, ballast bed and subgrade increase with the increase of train speed But the elasticity of ballastless track is the best. The elasticity of slab ballastless track is second, and the elasticity of ballastless ballastless track is worse.