成都地铁7号线轨道不平顺谱特征分析  

Characteristic Analysis of Chengdu Metro Line 7 Track Irregularity Spectrum

作　　者：陈辉 万壮 CHEN Hui;WAN Zhuang(Chengdu Metro Operation Co.,Ltd.,610081,Chengdu,China)

机构地区：[1]成都地铁运营有限公司,成都610081

出　　处：《城市轨道交通研究》2023年第7期1-6,共6页Urban Mass Transit

基　　金：国家自然科学基金面上项目(5197858)。

摘　　要：目的:为了对列车运行的平稳性、安全性、舒适性以及环境振动噪声进行更好的控制,亟需展开针对成都地铁线路进行轨道不平顺谱的分析研究。方法:采用轨检车对成都地铁7号线轨道弹性变形和永久变形的叠加状态进行动态检测,测试项目主要包括左右轨的高低不平顺、轨向不平顺、水平不平顺及轨距不平顺等。然后采用目前最常用的功率谱密度估计方法——Welch法(改进的周期图法)进行功率谱密度计算,得到统计期内被测轨道的长波高低不平顺谱、轨向不平顺谱、轨距不平顺谱及水平不平顺谱,并对计算结果进行分析,总结出成都地铁7号线轨道不平顺谱的频率特性,并与国内外典型轨道谱进行对比。基于非线性最小二乘法,采用中国三大干线谱公式对成都地铁7号线轨道谱进行曲线拟合。结果及结论:轨道板板缝会影响轨道的长波不平顺;成都地铁7号线轨道不平顺谱均存在空间频率为0.04 m-1整数倍的窄带谱峰,该空间频率与无缝钢轨相邻2个焊缝间的线路长度吻合,焊缝不平顺已经成为了严重影响轨道状态以及列车运行的问题;成都地铁7号线轨道的平顺性优于美国、德国以及我国的普速铁路(尤其是波长大于19 m的长波频段),但不如我国的高速铁路无砟轨道;中国三大干线谱更适用于成都地铁7号线。Objective:To better control the stability,safety,comfort,environmental vibration and noise of train operation,it is necessary to conduct analysis and research on track irregularity spectrum specifically for Chengdu Metro lines.Method:Dynamic tests are performed using a track inspection vehicle to detect the superposed state of elastic deformation and permanent deformation of Chengdu Metro Line 7 tracks.The test items mainly include vertical irregularity,lateral irregularity,horizontal irregularity,and gauge irregularity of both left and right rails.The widely used power spectral density estimation method-Welch method(improved periodogram method)is employed to calculate the power spectral densities of long-wave vertical irregularity,lateral irregularity,gauge irregularity,and horizontal irregularity of the tested tracks within the statistical period.The frequency characteristics of the track irregularity spectrum of Chengdu Metro Line 7 are summarized and compared with the typical track spectrums in China and abroad.Based on the nonlinear least squares method,the curve fitting of the track spectrum of Chengdu Metro Line 7 is carried out using the three main line spectrum formulas of China.Result&Conclusion:The track joint gaps affect the long-wave irregularity of the track;the track irregularity spectrum of Chengdu Metro Line 7 exhibits narrowed peaks at spatial frequencies that are integer multiples of 0.04 m-1;this spatial frequency corresponds to the length between two adjacent welds on continuous welded rails,indicating that the weld irregularities become a significant issue affecting the track condition and train operation;the track smoothness of Chengdu Metro Line 7 is better than that of the common speed railways in the United States,Germany and China(especially in the long-wave frequency range with wavelengths greater than 19 m),but not as good as that of the high-speed railway ballastless track in China;the three main line spectrum formulas of China are more suitable for Chengdu Metro Line 7.

关 键 词：地铁线路 轨道平顺性 轨道不平顺谱 轨道谱曲线拟合 

分 类 号：U213.213[交通运输工程—道路与铁道工程]