基于本征模函数的高速磁浮线路不平顺检测  

Detecting High-Speed Maglev Line Irregularity Based on Intrinsic Mode Function Analysis

作　　者：苏燕辰[1] 伍川辉[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《西南交通大学学报》2011年第1期92-97,共6页Journal of Southwest Jiaotong University

基　　金：国家863计划资助项目(2005AA505010-511)

摘　　要：为了评估磁浮线路的不平顺程度,对实测加速度信号进行分析,发现导向系统纵向振动加速度信号对磁浮线路不平顺长波最敏感.通过对导向系统纵向振动加速度信号进行Hilbert-Huang变换,提取对应长波频率的本征模函数,求得频率族的包络瞬时幅值和瞬时频率,提取了不平顺长波.用该方法分析磁浮列车以430 km/h运行时的实测数据,得到的磁浮线路长波不平顺信号与采用大地测量法测得的结果一致.In order to assess the track irregularity of maglev lines,an analysis was made of the practical data of track-inspection acceleration signals of a high-speed maglev train,which indicates that the longitudinal vibration acceleration signal of the train guidance system is most sensitive to the long-wave irregularity of the maglev line.Hilbert-Huang transform is used to extract the intrinsic mode functions（IMFs） of the long-wave frequencies of the acceleration signals to obtain the instantaneous amplitude（envelope） and instantaneous frequency and then extract the long-wave irregularity signals.The proposed method was applied to analyze the practical data of a maglev train moving at a speed of 430 km/h,and the obtained long-wave irregularity signals of the maglev line agree with the ground survey results well.

关 键 词：高速磁悬浮列车 不平顺长波 HILBERT-HUANG变换 本征模函数 

分 类 号：U211.8[交通运输工程—道路与铁道工程]