基于ZFFT的轨道波磨高精度弦测算法研究  

A discussion about high-precision chord measurement algorithm for rail corrugation based upon ZFFT

作　　者：殷华[1,2] 朱洪涛[1] YIN Hua;ZHU Hongtao(School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330096, China;School of Software, Jiangxi Agricultrual University, Nanchang 330045, China)

机构地区：[1]南昌大学机电工程学院,江西南昌330096 [2]江西农业大学软件学院,江西南昌330045

出　　处：《铁道科学与工程学报》2017年第9期1851-1858,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金地区科学基金资助项目(51468042);江西省自然科学基金资助项目(20142BAB206003)

摘　　要：弦测是轨道波磨不平顺测量的重要方法之一,但理论的缺陷使其无法同时提高复原精度与计算效率。针对这一问题,根据工程中轨道波磨不平顺的测量需求,提出基于ZFFT(ZOOM-FFT)的高精度弦测逆滤波算法。通过复调制将感兴趣的频段平移至零频点,去除高频部分后重排、补偿得到复信号,对该复信号进行选择性共轭扩展重构,再利用傅里叶反变换逆滤波得到轨道波磨不平顺测量值。理论仿真和线路实测表明,该方法能够在时间消耗较少的情况下提高测量精度,适合工程应用。A chord measurement is one of the most important rail corrugation’s inspecting method,but thetheoretical defect restricts it from the increasing recovery precision and the efficiency at the same time.In order tosolve this problem and meet the demand of rail corrugation's measurements in engineering,a new ZFFThigh-accuracy algorithm was proposed.Complex modulation was utilized to shift target frequency to zero point,after removing high frequency noises,conjugating extension and inverting Fourier Transform,track irregularitieswere calculated.The data simulation and test results showed that this method can improve the accuracy ofmeasurements an their values with less space and time consumption,hence,it is suitable for engineeringapplication.

关 键 词：轨道波磨 逆滤波 弦测法 ZFFT 

分 类 号：U216.3[交通运输工程—道路与铁道工程] TH17[机械工程—机械制造及自动化]