HHT在车辆-轨道系统垂向振动时频分析中的应用  

Time-Frequency Analysis of Vehicle-Track Vertically Coupling System Based on Hilbert-Huang Transform

作　　者：李再帏[1] 练松良[2] 刘晓舟[2] 

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《振动．测试与诊断》2013年第5期799-803,911,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(50878158);上海工程技术博士启动基金资助项目(校启2013-10);上海市教育委员会085内涵建设资助项目(0852011XKZY12)

摘　　要：应用希尔伯特黄变换方法（Hilbert-Huang transform,简称HHT）对车辆-轨道系统中高低不平顺与车辆垂向振动加速度关系进行分析.首先,利用经验模态分解法（empirical mode decomposition,简称EMD）对实测的高低不平顺与车辆垂向振动加速度信号进行分解,得到两者的本征模函数；然后,通过比较分析两者本征模函数的时域波形与Hilbert能量谱,说明高低不平顺本征模函数与车辆垂向振动加速度本征模函数之间的确定性的对应关系,可以利用车辆垂向振动加速度来识别轨道高低不平顺的不良区段；最后,对京广提速干线铁路轨检车实测样本进行回归分析,得到在波长为1.5～50 m范围内直线和曲线段高低不平顺与车辆垂向振动加速度的定量关系.The relationship between track vertical profile irregularity and vertical vibration acceleration of car body is analyzed by using Hilbert-Huang Transform(HHT).Firstly,actual measured vertical profile irregularity and vertical vibration acceleration of car body are decomposed by empirical mode decomposition(EMD)to obtain intrinsic mode function(IMF).Then,by comparing IMF waveform with the energy spectrum of the irregularity and vibration acceleration,the definitive correspondence of IMFs and adverse section of irregularity can be identified from vertical vibration acceleration of car body.Finally,regression analysis is taken for measured irregularities sample of track inspection car on Beijing-Guangzhou line.The quantitative relationship between track vertical profile irregularity and vertical vibration acceleration of car body is established with a wavelength between 1.5mand 50m.

关 键 词：希尔伯特-黄变换 本征模函数 轨道不平顺 车辆振动响应 时频分析 

分 类 号：U216.3[交通运输工程—道路与铁道工程]