客运专线轨道不平顺功率谱分析

以秦皇岛至沈阳客运专线和武汉至广州高铁轨检车实测轨道不平顺数据为分析对象,基于样本平稳性检验,采用FFT方法进行样本空间的谱估计,并用MATLAB编程得到客运专线轨道不平顺谱密度曲线,研究表明,轨道高低与方向不平顺谱曲线均连续变化,其不平顺包含许多不同幅值和波长的谐波成分,波长范围较宽,轨道高低和方向不平顺谱密度曲线高频段比较光滑,低频段含有复杂的周期性波形。同时对2条客运专线轨道谱密度曲线进行了拟合,并得到相应的特征参数。其结果对研究我国客运专线轨道不平顺功率谱具有参考价值。

Power spectral analysis of track irregularity of passenger line

In this paper,track irregularity data measured on Qinhuangdao-Shenyang Passenger Line and Wuhan-Guangzhou high-speed track were used as samples.Based on sample stability test,we used the FFT method for spectral estimation on sample space,and MATLAB programming to get the track irregularity spectral density curve of the passenger lines.The study has shown that the level and direction of the track irregularity spectrum curves continuously change,which includes many harmonic components of different magnitude and wavelengths.The wavelength range is relatively wide,and high frequency spectral density curve of the track whose level and direction are irregular is relatively smooth,and low-frequency part contains the complex periodic waveforms.This paper means to fit two spectral density curves of two passenger lines and gain the corresponding parameters.The results of the study have a reference value to track irregularity power spectrum for Chinese passenger line.