改进希尔伯特-黄变换分析波磨对列车时频特征的影响

摘要

The aim of this paper is to investigate the influence of rail corrugation on time-frequency characteristics of a train.A spatial coupling model of the vehicle-track system is presented,and dynamic response of the vehicle system under the track short wave and long wave corrugation stimulation is obtained.The Ensemble Empirical Mode Decomposition and Normalized Hilbert Transform are introduced to the vibration signal analysis of vehicle-track coupling system.Then the influ-ence of different wavelength and wave depth of corrugation on time-frequency distribution of bogie response are analyzed. The simulation result indicate that corrugation can induce the frequency modulation of bogie response,the ratio of frequency amplitude to mean frequency can be used as an indicator of rail-wheel impact.%本文旨在研究钢轨波浪形磨损对列车时频特征的影响。建立了车辆／轨道空间耦合模型，模拟计算了钢轨短波、长波波磨激励下车辆系统的动力响应。将集成经验模态分解（Ensemble Empirical Mode Decomposition，EEMD）和正交希尔伯特变换（Normalized Hilbert Transform，NHT）应用于车辆／轨道耦合系统的振动信号分析中，分析了不同波深和波长的波磨对转向架动力响应时频特征的影响。结果表明：波磨会引起车辆系统振动响应的频率调制，频率振幅与平均频率之比可作为轮轨冲击的预警指标。