浮置板式轨道结构隔振效果仿真研究

建立列车—轨道结构耦合系统有限元模型,将轨道不平顺作为列车—轨道结构耦合系统的激励源,对普通碎石道床轨道结构和浮置板式轨道结构的列车—轨道结构耦合系统动力学性能进行仿真研究,对比分析这2种类型的轨道结构系统振动响应与系统振动传递函数,评价浮置板式轨道结构的隔振效果。分析结果表明,浮置板式轨道结构与普通碎石道床轨道结构相比,振动加速度降低约70%,距线路5 m处大地振动加速度响应峰值降低约62.8%,相应Z振级衰减约10 dB,竖向振动加速度频率范围由0~200 Hz降到0~60 Hz,有效起到了振动隔离效果。

The Simulation Research on the Vibration Insulation Performance of the Floating Slab Track Structure

The finite element model of train and track structure of track-traffic coupling system is established. The track irregularity is considered as the exciting source of the coupling vibration of train and track structure. The system vibration performances of the two coupling systems of train/ballast track structure and train/floating slab track structure are simulated. The system vibration responses and the system transfer functions of the two structures are contrasted and analyzed, and the vibration insulation performance of the floating slab track structure is estimated. The analysis results demonstrate that contrasting floating slab track structure with ballast track structure, the vibration acceleration is reduced by almost 70 %, the vibration acceleration responses amplitude of ground at 5 m from the line is reduced by about 62.8%, corresponding Z is reduced about 10 dB and the vertical vibration acceleration frequency is reduced from 0-200 Hz to 0-60 Hz. The vibration insulation performance is effective.