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 longwave 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.%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.
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