基于同步提取短时Fourier变换的高铁钢轨波磨检测  

Detection of Rail Corrugation Based on Synchro-Extracting of Short-Time Fourier Transform

作　　者：孙秀秀 张长伦 刘金朝 徐晓迪 SUN Xiuxiu;ZHANG Changlun;LIU Jinzhao;XU Xiaodi(Science School,Beijing University of Civil Engineering and Architecture Beijing 100044;Infrasture Inspection Research Institute,China Academy of Railway Sciences,Beijing 100081)

机构地区：[1]北京建筑大学理学院,北京100044 [2]中国铁道科学研究院基础设施检测研究所,北京100081

出　　处：《北京建筑大学学报》2019年第3期41-46,共6页Journal of Beijing University of Civil Engineering and Architecture

基　　金：国家自然科学基金项目(61473111,61502024);北京未来城市设计高精尖创新中心资助项目(UDC2017033322)

摘　　要：钢轨波磨已成为高速铁路轨道损伤的主要形式之一,影响着乘坐的舒适性及列车的运行安全性,因此寻找有效检测轨道波磨是必要的.针对同步压缩变换存在能量发散以及抗噪性差等问题,提出了基于同步提取变换的高铁钢轨波磨检测方法.利用同步提取变换对实测高铁轴箱振动加速度信号提取瞬时频率曲线及波磨的特征频率,获得了能量更加集中的时频表示及清晰的瞬时频率曲线,克服了同步压缩变换存在的能量发散以及频率混叠的问题.分析结果表明该方法实现了高铁钢轨波磨的检测与定位,与传统的方法相比速度快,精度高.Rail corrugation has become one of the main forms of rail damage in high-speed railway,which affects ride comfort and train safety.It is necessary to find an effective detection of rail corrugation.Aiming at the problems of energy divergence and poor noise resistance in synchronous compression transformation,a method of rail corrugation detection based on synchronous extraction transformation is proposed.The instantaneous frequency curve and the characteristic frequency of corrugation are extracted from the vibration acceleration signal of high-speed railway axle box by using synchroextracting transformation.The time-frequency expression with more concentrated energy and clear instantaneous frequency curve are obtained,which overcomes the problems of energy divergence and frequency aliasing in synchrosqueezing transformation.The analysis results show that the method realizes the detection and location of high-speed rail corrugation,which is faster and more accurate than the traditional method.

关 键 词：时频分析 同步提取变换 同步压缩短时傅立叶变换 高铁波磨检测 

分 类 号：TN801[电子电信—信息与通信工程] TN911.1