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 u-nit' 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.%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.
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