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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 finite element model of the train-rail structure coupling system is established. The track irregularity is taken as the excitation source of the train-rail structure coupling system. The dynamic performance of the train-rail structure coupled system of the common railroad track bed structure and the floating slab track structure Simulation studies are conducted to compare and analyze the vibration responses and the system vibration transfer functions of the two types of orbital structures to evaluate the vibration isolation effect of the floating slab track structure. The analysis results show that the vibration acceleration decreases by about 70% compared with that of conventional ballast track structure, the peak value of ground vibration acceleration decreases about 62.8% at 5 m away from the line, and the corresponding Z-vibration attenuation decays by about 10 dB, Vertical vibration acceleration frequency range from 0 ~ 200 Hz down to 0 ~ 60 Hz, effectively played a vibration isolation effect.