基于谱峭度与时频分析的接触线不平顺检测  

Irregularity Detection of Contact Wire Based on Spectral Kurtosis and Time⁃Frequency Analysis

作　　者：陈小强[1] 沈彦龙 王英 张玺 曹丽 母秀清[2] CHEN Xiaoqiang;SHEN Yanlong;WANG Ying;ZHANG Xi;CAO Li;MU Xiuqing(School of Automation&Electrical Engineering,Lanzhou Jiaotong University Lanzhou,730070,China;School of Electrical Engineering,Southwest Jiaotong University Chengdu,610031,China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070 [2]西南交通大学电气工程学院,成都610031

出　　处：《振动．测试与诊断》2021年第4期695-700,829,830,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：中国铁路总公司科技研究开发计划重点资助项目(2017J012⁃A);国家自然科学基金资助项目(51767013);甘肃省科技厅自然科学基金资助项目(18JR3RA111)。

摘　　要：为了解决实际运营中高速铁路接触线不平顺定位困难的问题,提出了一种基于Choi⁃Williams谱峭度(Choi⁃Williams spectral kurtosis,简称CW⁃SK)与二次时频分析相结合的方法。利用CW⁃SK对突变信号高度敏感的特性,在识别弓网接触压力不平顺成分的基础上,对不平顺时域重构信号进行二次时频分析,确定接触线上不同波长对应的空间位置。测试结果表明,该方法可准确识别并定位接触线中的不平顺病害,且时频图中无其他干扰成分,抗噪性能优异,满足高速铁路实际运营需求,可为现场接触线不平顺的状态评估及接触网的后期维护提供参考。In order to solve the problem of positioning irregularity of high-speed railway contact wire in actual operation,a method based on Choi-Williams spectral kurtosis(CW-SK)and quadratic time-frequency analysis is proposed.Since CW-SK is highly sensitive to abrupt transition signals,the irregular components of pantograph-catenary contact pressure can be identified.On this basis,the quadratic time-frequency analysis of the irregular reconstructed signal is carried out to determine the spatial location of different wavelengths on the contact wire.The final test results show that the method can accurately identify and locate the irregularities of contact wire,and there are no other interference components in the time-frequency diagram.Furthermore,the method has good anti-noise performance,which can meet the actual operation requirements of high-speed railway.This paper can provide some references for the evaluation of the contact wire irregularity state and the later maintenance of catenary.

关 键 词：高速铁路 谱峭度 时频分析 弓网接触压力 接触线不平顺 

分 类 号：U255.3[交通运输工程—道路与铁道工程] TP391.9[自动化与计算机技术—计算机应用技术]