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为研究CRH2动车组在无砟轨道段运行引起的场地加速度振动的频谱特性,本文对我国首条无砟轨道段(渝遂铁路二岩隧道—湾里头隧道段)动车组运行时的场地振动进行了现场实测;对实测竖向振动加速度时程进行1/3倍频谱分析表明:地面竖向振动加速度随着与振源距离的增大而明显衰减,随车速增大场地振动强度增强;应用正交HHT变换,对加速度时程进行了Hilbert谱分析,获得了地面竖向振动加速度的主频为10~120Hz、振动传播高频成分衰减较快等频谱特性;最后,将Hilbert边际谱与傅里叶谱进行了对比分析,得到了两种方法分析振动信号频谱特性表现出的差异性。
In order to study the spectral characteristics of the site acceleration vibration of CRH2 EMU operating in the ballastless orbit section, the vibration of the site during the operation of the first non-ballasted track section (Yuanyu Railway Erlang Tunnel-Wanlidou Tunnel Section) The field measurements were carried out. The 1/3 frequency spectrum analysis of the measured vertical vibration acceleration time history shows that the vertical ground acceleration decreases obviously with the increase of the distance from the vibration source, and the vibration intensity of the ground increases with the increase of vehicle speed. HHT transform was applied to analyze the acceleration time history Hilbert spectrum, the vertical frequency of ground vibration was found to be 10 ~ 120Hz and the high frequency component of the vibration was attenuated rapidly. Finally, the Hilbert marginal spectrum was compared with Fourier Leaf spectra were compared and analyzed. Two methods were obtained to analyze the difference of the spectral characteristics of vibration signals.