基于时频分析的高速铁路路基局部变形识别方法

Local Deformation Identification Method for High Speed Railway Subgrade Based on Time-frequency Analysis

基于短时傅里叶变换的时频分析模型,提出一种高速铁路路基局部变形的识别方法。利用高速综合检测列车采集的高低不平顺数据,对其做短时傅里叶变换得到时频图。通过时频分析,得到路基局部变形区域在时频图上的特征,即路基局部变形区域在特定频率范围内能量显著增强。基于这一特征,在时频图上采用谱残差模型提取能量显著区域,从而识别出路基局部变形区域。研究结果表明:该方法能利用轨道高低不平顺数据有效识别出路基局部变形区域,同时能反映出该变形区域的时频域特性。

Based on time-frequency analysis model with short-time Fourier transform,an identification method for local deformation of high speed railway subgrade was proposed.By using longitudinal level irregularity data collected by high speed comprehensive inspection train,a short-time Fourier transform was performed to obtain a time-frequency diagram.The characteristic of the local deformation regions of the subgrade on the time-frequency diagram was obtained with time-frequency analysis,i.e.the energy in the specific frequency range of the local deformation region of the subgrade was significantly enhanced.Based on this characteristic,the energy salient regions on the time-frequency diagram were extracted by using the spectrum residual model and the local deformation regions of the subgrade were thereby identified.The research results indicate that the proposed method can effectively identify the local deformation regions of the subgrade by using track longitudinal level irregularity data,and can reflect the time-frequency characteristics of the deformation regions.