关键词: 高速列车, 小波脊线, 轨道波浪弯曲, 经验模态分解（EMD）, 轨道检测

Abstract: Railway track irregularity is an immediate factor of train vibration.An Empirical Mode Decomposition（EMD） based wavelet ridge method is proposed for detecting the railway track irregularity. The high-frequency components of the original signal are filtered. Afterwards, the EMD is implemented on the low-frequency components. Then, the wavelet ridge of the Intrinsic Mode Function（IMF） component is extracted, which contains the irregularity information. According to analysis of the wavelet bridge’s frequency domain, the transient signal’s time can be confirmed.The analysis of the measured data for a track shows that the wavelet bridge method based on EMD can detect the singularity component of signals expediently and effectively and thus determining the position of rail irregularity exactly.

Key words: high-speed train, wavelet bridge, rail wavy irregularity, Empirical Mode Decomposition（EMD）, track detection