基于不平顺谱的轨道不平顺状态评价与识别探讨

Evaluation and Identification Discussion of Track Irregularity State Based on Irregularity Spectrum

中文关键词:轨道不平顺功率谱密度  不平顺状态  时频域  识别  评价

英文关键词:track Irregularity spectrum density  irregularity state  time frequency domain  identification  evaluation

中文摘要:

      线路不同区段轨道质量参差不齐，但其幅频差异能很好地在各区段轨道不平顺功率谱密度（PSD）曲线上得到表征。基于此，结合沪宁客运专线轨检数据，从识别和评价两个方面对轨道平顺状态进行了研究。基于不同区段轨道谱存在幅频特性差异，提出以200 m为一研究单元，通过分频段离散各单元轨道谱幅频信息，以三维图的形式进行不平顺的时频域识别分析。借鉴轨道谱分级管理的方法，同时综合波段整体不平顺和波段内各波长幅值波动程度两项指标，研究并给出了评价各里程单元平顺性的方法，将综合评价后各区段所属不平顺状态等级划分为优秀、良好、合格、失格。

英文摘要:

      The railway quality of different sections on the line is uneven, and its amplitude frequency differences can get good characterization through each section’s rail irregularities power spectral density (PSD) curve. Based on these, combined with the track inspection data of Shanghai Nanjing Dedicated Railway, we did a research on the track smooth state from two aspects including identification and evaluation. Based on the existence of amplitude frequency characteristic differences at different sections’track spectra, with 200 m for a research unit proposed, and via dispersing the amplitude frequency message at different frequency band of each unit’s track spectrum, we can conduct the identification and analysis of the track irregularity at the time frequency domain in the form of three dimensional diagram. Borrowing idea from the classification method of track irregularity management, through a comprehensive research of two indicators of the overall irregularity of the waveband and the fluctuation extent of each wavelength amplitude at waveband, the method of evaluating the smooth state of each mileage unit was put forward, which divides the unit zone’s irregularity state into the rank of outstanding, good, qualified and disqualified after comprehensive evaluation.