The invention discloses a phi-OTDR-based high-speed rail track health online monitoring method, which uses existing communication optical fibers laid along a railway for sensing to capture vibration information of the railway after a train passes by. The method comprises the following steps: organizing data into a waterfall plot with gray scale representing intensity according to a time axis, performing wavelet decomposition filtering, extracting a track generated by train running by adopting an edge extraction algorithm based on dynamic programming, and dividing two regions before and after the track; making time-frequency analysis on the track area and the areas before and after the track, extracting a wheeltrack vibration characteristic frequency spectrum and a steel rail resonance characteristic frequency spectrum, and obtaining a wheeltrack vibration characteristic frequency and a steel rail resonance characteristic frequency through a characteristic frequency spectrum extractionalgorithm; continuously repeating the monitoring process to obtain the change of the steel rail vibration characteristics along with time, and establishing a corresponding database; comparing the newly acquired data with the data in the database and updating the database to realize real-time health monitoring of the train and the steel rail.

    本发明公开了一种基于φ‑OTDR的高铁轨道健康在线监测方法,利用铁路沿线铺设的既有通信光纤进行传感,捕获铁路沿线在列车经过后的振动信息。将数据按时间轴组织为一灰度表示强度的瀑布图,进行小波分解滤波后,采用基于动态规划的边缘提取算法提取出列车行驶产生的轨迹,划分出轨迹前和轨迹后两个区域。分别对轨迹区域和轨迹前后区域进行时频分析,提取出轮轨振动特征频谱和钢轨谐振特征频谱,再经过特征频谱提取算法,得到轮轨振动特征频率和钢轨谐振特征频率。不断的重复此监测过程,得到钢轨振动特性随时间的变化,建立对应的数据库。新采集到的数据与数据库中的数据进行对比并更新数据库,实现对列车和钢轨的实时健康监测。


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    Title :

    High-speed rail track health online monitoring method based on phi-OTDR


    Additional title:

    一种基于φ-OTDR的高铁轨道健康在线监控方法


    Contributors:
    ZHANG XUPING (author) / WANG SU (author) / LI MI (author)

    Publication date :

    2020-08-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC / E01B PERMANENT WAY , Gleisoberbau / G01N Untersuchen oder Analysieren von Stoffen durch Bestimmen ihrer chemischen oder physikalischen Eigenschaften , INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES



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