摘要
研究了中国提速线路轨道不平顺谱估计方法,提出了中国提速线路轨道不平顺谱。为提高功率谱的精度,首先利用线性插值剔除异常值、EMD模态分解法消除趋势项并进行滤波处理。基于最大熵法和Welch法统计得到提速线路轨道不平顺谱,并对比分析了不同月份的轨道不平顺谱的特性,采用非线性最小二乘法拟合提出中国提速线路轨道不平顺谱表达式及拟合参数。研究表明,利用Welch法和最大熵法计算提速线路轨道不平顺谱,最大熵法计算得到轨道谱的分辨率和精度优于Welch法;对比基于非线性最小二乘法的3种拟合函数,nlinfit函数能较好地拟合提速线路轨道不平顺谱。提出提速线路轨道谱拟合参数,为提速线路的养护维修、优化设计等提供参考依据。
This paper studied the estimation method of track irregularity spectrum of the speed raising line in China and put forward the track irregularity spectrum of the speed raising line in our country.In order to improve the accuracy of power spectrum,linear interpolation was used to eliminate outliers,and EMD mode decomposition method was used to eliminate trend items and filter them.Based on the maximum entropy method and Welch method,the track irregularity spectra of the speed-up lines were obtained,and the characteristics of track irregularity spectra in different months were compared and analyzed.The nonlinear least square method was used to fit the track irregularity spectra expressions and fitting parameters of the speed-up lines.The results show that the resolution and accuracy of track irregularity spectra obtained by Welch method and maximum entropy method are better than Welch method.By comparing the three fitting functions based on the nonlinear least square method,the nlinfit function can better fit the track irregularity spectrum of the speed-raising line,and the fitting parameters of track spectrum of the speed-raising line are proposed,which can provide reference for the maintenance and optimization design of the speed-raising line.
作者
房建
涂祥国
王宏轩
雷晓燕
练松良
Fang Jian;Tu Xiangguo;Wang Hongxuan;Lei Xiaoyan;Lian Songliang(State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Engineering Research Center of Railway Environment Vibration and Noise of the Ministry of Education,East China Jiao Tong University,Nanchang 330013,China;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China)
出处
《石家庄铁道大学学报（自然科学版）》
2023年第2期82-88,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金(51668019)
江西省教育厅科研项目(GJJ180297)。
关键词
提速线路
最大熵法
轨道不平顺谱
拟合谱
speed up rail lines
maximum entropy method
orbit irregularity power spectrum
the fitted power spectrum
