中文摘要：

应用白噪声聚类经验模型分解方法（EEMD,Ensemble EMD）,进行轨道—车辆系统的时频分析,分析钢轨不平顺的波长—幅值分布及短波不平顺的分布特点。通过理论推导,得到垂向钢轨不平顺与车体垂向加速度之间的转移函数,并由简化模型仿真结果与实验数据对比分析得出二者的相关系数在0.8以上,表明仿真结果与实验数据非常吻合。利用简化模型进行数值仿真,所需复数乘法次数为N（2logN＋1）,满足实时仿真的需要。实例所测钢轨不平顺和车体加速度的相关性分析结果表明,对加速度数据进行EEMD处理,所得结果能反映钢轨不平顺幅值变化及所在的空间位置等信息。

英文摘要：

We studied the time-frequency character of the signal of track-vehicle system dynamics based on EEMD （Ensemble EMD）. We got the time-frequency distribution of track irregularity and the character of short-wave track irregularity. We also deduced the transfer function between track irregularity and the vertical acceleration of the car body. The cross relation coefficients between simulation result and measurement result are over 0. 8. It proved the simulation model worked well and the simulation result agreed well with experiment data. The simulation model can be used for the on-line simulation because the times of the complexity multiply is N （21ogN＋1）. The analysis of the measurement data, which was the comparison between track irregularity and the acceleration of the car body, have shown that the acceleration, after it was processed by EEMD method, can reflect the change of the amplitude of track irregularity and its location.