基于合-武客运专线2009-03~2010-03的轨道不平顺检测数据，对1~50 m中长波范围内的轨道不平顺特性进行实测分析。利用 Welch法对轨道不平顺功率谱密度函数进行估计，分析合-武客运专线轨道不平顺功率谱随波长变化的规律，比较我国客运专线轨道谱与国内外轨道标准谱的差异；对比分析轨道结构对合-武客运专线轨道谱的影响规律；利用非线性最小二乘优化算法对客运专线轨道不平顺谱密度函数进行拟合，提出客运专线轨道不平顺谱拟合公式。%Based on the track irregularity data of Hefei-Wuhan Passenger Dedicated Line measured by track in-spection car between March 2009 to March 2010,the characteristics of track irregularity in the range of the 1~50 m medium and long wavelength were measured and analyzed.The Welch method was used to estimate the density function of the track irregularity power spectrum,to analyze the change rule of track irregularity power spectrum of Hefei-Wuhan Passenger Dedicated Line with the variation of wavelength.The track spectrum of Hefei-Wuhan Passenger Dedicated Line was compared with domestic and foreign standard track spectrum.At the same time the impact of track structure on the track irregularity power spectrum of Hefei-Wuhan Passenger Dedicated Line was analyzed.The non-linear least squares optimization algorithm was applied to fit the density function of track irregularity power spectrum of the of Passenger Dedicated Line.The fitting formula for track irregularity power spectrum for the Passenger Dedicated Line was proposed.
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