有砟梯式轨枕轨道减振性能的理论分析与试验研究

为实验室铺设有砟、无砟两种梯式轨枕轨道，用自由落锤激励装置对两种梯轨减振性能进行对比研究。建立有砟梯轨、有砟普通轨道的数值模型，利用试验测试结果对模型进行验证。通过在模型中施加货运列车荷载对比两种有砟轨道减振性能。结果表明，有砟梯轨减振性能不及浮置式梯轨，在低频段有一定减振能力，20 Hz以下振动经道砟平均衰减25 dB，对控制重载货运列车环境振动具备潜在优势；梯式轨枕对分散列车冲击振动、降低时域内峰值有明显优势。

Theoretical analysis and experimental study on vibration mitigation characteristicsof ballasted ladder track

Both ballasted and ballastless ladder track were constructed in laboratory. A comparison study on vibration mitigation of the two kinds of ladder track was performed by an automatic falling weight system. A numerical model was built for ballasted track with both ladder sleeper and normal concrete sleeper, which was validated by test results. The vibration mitigation characteristics under moving freight train loads were compared for the two kinds of ballasted tracks. Results indicate that ① the vibration mitigation of ballasted ladder track is worse than floating ladder track; ② ballasted ladder track has the advantages on vibration reduction within low frequencies, with the averaged vibration attenuation of 25 dB below 20 Hz through the ballast; ③ ladder sleepers have obvious advantages of easing the train-induced impulse vibration and reducing peak value in time domain; ④ ballasted ladder track has potential advantages for controlling freight train-induced environmental vibrations.