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以秦沈客运专线轨检车实测轨道不平顺数据为统计样本,基于样本平稳性检验,采用FFT方法进行样本空间的谱估计,并由MATLAB编程得到轨道不平顺谱密度和相关函数。通过对比分析,发现无砟轨道不平顺优于有砟轨道,高低和方向不平顺尤为突出;在8 m以下波段内无砟轨道不平顺很好,无明显周期性成分;无砟轨道左右股钢轨横向不平顺控制均匀;左右两轨高低不平顺相关性较强,方向不平顺相关性较弱。基于样本的总体平均,运用非线性最小二乘拟合优化算法,得出无砟轨道不平顺谱密度拟合曲线参数值,对于研究我国无砟轨道不平顺功率谱有参考价值。
Based on the sample smoothness test, the FFT method was used to estimate the spectrum of samples, and the track irregularity spectral density and correlation function were obtained by MATLAB programming. Through comparative analysis, it is found that the irregularity of the ballastless track is superior to that of the ballasted track, and the unevenness of the ballastless track is particularly prominent. The ballastless track is very smooth and has no obvious periodic component in the band below 8 m. Horizontal uneven smooth control; left and right track irregularity is relatively strong, the direction of the relationship between the weaker. Based on the population averages, nonlinear fitting method of least square fitting was used to get the fitting curve parameters of the uneven spectral density of the ballastless orbit, which is of reference value for studying the unevenness of the ballastless power spectrum in our country.