青藏铁路轨道不平顺谱研究  

Research on track irregularity power spectrum density of Qinghai-Tibet railway

作　　者：陈宪麦[1,2] 徐磊[3] 王卫东[1] 贺天龙[1] 张向民[1,2] 向尚[1] 陈文韬[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410075 [3]西南交通大学牵引动力国家重点实验室,四川成都610031

出　　处：《铁道科学与工程学报》2016年第9期1686-1695,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51478482);中国铁路总公司科技研究开发计划课题资助项目(Z2013-G006);铁道部科技研究开发计划课题资助项目(Z2012-066)

摘　　要：利用较为完备的青藏铁路轨道不平顺实测数据,将概率论方法较为系统的用于青藏铁路轨道不平顺谱研究,对不同波长的功率谱密度样本进行广义极值分布函数拟合、参数估计及假设检验分析。在此基础上,对青藏铁路的线路几何状态及轨道不平顺谱线特征进行分析;采用Levenberg-Marquardt法及铁科院7参数公式对青藏铁路轨道不平顺统计平均值谱进行公式拟合及参数提取;结合广义极值分布函数的参数估计值,提出由轨道不平顺统计平均值谱向任意百分位谱转换的方法。研究结果表明:青藏铁路轨道不平顺不同波长下的谱密度值均服从广义极值Ⅱ型分布(Frechet分布);轨道高低和轨向不平顺谱线呈现复杂的窄带和周期波谱特征,其轨距不平顺状态基本处于德国高干扰谱和美国六级谱之间,应该作为重点关注的不平顺类型;结合不同波长谱密度的概率分布规律,建议在统计平均值谱的基础上,融合尖峰谱线特征,以便提供更为合理的动力仿真激励输入谱。Combining with relatively complete measured track irregularities on Qinghai-Tibet Railway, this paper systematically introduced probability theory into the study of track irregularity spectrum, and made an detail research on generalized extreme value distribution function fitting, parameter estimation and hypothesis testing for power spectrum density samples of different wavelengths. On this basis, the railway＇s track geometry status and characteristics of track irregularity spectrum were analyzed, and then formula fitting and parameter extraction were conducted for track irregularity statistical average spectrum using Levenberg-Marquardt algorithm and 7 pa-rameters formula of Chinese trunk railways, last we proposed a method that any percentile spectrum could be transformed by track irregularity statistical average spectrum through which. The research results show that; the spectrum density values of different wavelengths obey the generalized extremum II type distribution ; the track profile vertical and alignment irregularity spectrum present complicated narrow-bands and periodic spectral lines, and its track gauge irregularity is mostly located in German high speed high disturbance line and American sixth grade track line; combined with the probability distribution laws of different wavelength spectrum densities, thispaper suggests that we should consider and blend the peak spectrum line features on the basis of the statistical average spectrum for providing more reasonable dynamic simulation spectrum.

关 键 词：青藏铁路 轨道不平顺谱 广义极值分布 参数估计 假设检验 拟合 

分 类 号：U213.21[交通运输工程—道路与铁道工程]