京津城际铁路轨道不平顺谱特征分析

Characteristic Analysis of the Power Spectral Density(PSD) of Track Irregularity on Beijing-Tianjin Inter-City Railway

为提高京津城际铁路轨道不平顺谱的计算精度,基于轨道不平顺变化率和线性插值方法以及小波分析方法,给出剔除轨道不平顺异常值算法和轨道不平顺零均值化处理算法,用于京津城际铁路轨道不平顺检测数据的预处理。运用周期图法计算京津城际铁路的轨道不平顺谱。对计算结果的统计分析表明:京津城际铁路的轨道不平顺谱服从自由度为2的χ2分布,可以用轨道不平顺中位数谱表示;除部分波段外,京津城际铁路的轨道不平顺谱均低于我国铁路时速200 km以上既有线路的轨道不平顺谱和德国铁路的轨道不平顺低干扰谱,说明京津城际铁路轨道平顺状态较好。

To improve the calculation accuracy of PSD of track irregularities of Beijing-Tianjin inter-city railway, an elimination method of abnormal value and a zero mean normalization method of track irregularities are given and used in the data preprocessing of track irregularities on this railway based on the change rate of track irregularities, the method of linear interpolation, and the method of wavelet analysis. The PSD of track irregularities of Beijing-Tianjin inter-city railway is calculated by using the periodogram method. The statistic and analysis result indicates that the PSD of track irregularities of Beijing-Tianjin intercity railway obeys a χ^2 distribution with 2 degrees of freedom and can be described by using the median of PSD. The PSD of track irregularities of Beijing-Tianjin inter-city railway is lower than the PSI） of the existing railway above 200 km · h^-1 in China and the PSD of low disturbance irregularities of German highspeed railway except for some wavelength bands, this indicates that the track status of Beijing-Tianjin inter-city railway is better.