低速磁浮轨道不平顺功率谱研究

轨道不平顺是磁浮列车振动的主要激扰源,直接关系到列车运行的稳定性和舒适性。文章基于唐山低速磁浮试验线实测的轨道不平顺数据,采用周期图法进行样本空间的谱估计,得到轨道不平顺在各空间波长的分布。分析结果表明,轨道本身结构参数、轨道安装精度和F轨的轧制工艺是产生轨道不平顺的主要原因。参考国内外成熟的铁路轨道谱线表达形式,得到低速磁浮轨道谱的拟合曲线公式,应用阻尼最小二乘算法拟合轨道谱表达式的参数,对于研究我国磁浮轨道不平顺功率谱有重要的参考价值。

Estimation of Power Spectrum Density Track Irregularities of Low-speed Maglev Railway Lines

Track irregularity is the main excitation source to vibration of the maglev train,and it has direct influence on stability and ride quality of the train.The statistical specimens of track irregularities are collected from the TangShan low-speed maglev experimental line on the basis of the stationarity tests of the specimens,the Fast Fourier Transform(FFT) method was used to evaluate the spectra of the whole specimen space.Distribution of track irregularities in space wavelengths was found.Analysis results show that the structural parameters,installation precision and rolling technique of tracks are the main causes of track irregularity.Referring to the mature PSD(power spectrum density) expressions published athome and abroatl,the set fitting formulas of PSD for low-speed maglev railway lines were proposed.The parameter values of PSD fitting curves for low-speed maglev track irregularities were obtained by use of the damping curve-fitting algorithm in the least-squares sense.Significaul reference is provided to study on track irregularity PSD of low-speed maglev railway lines.