高速铁路无砟轨道不平顺谱的比较分析

Comparative analysis of power spectrum density of ballastless track irregularities of Chinese high-speed railway

从功率谱密度、时间样本和动力影响角度，对中国高速铁路无砟轨道不平顺谱进行分析，并与德国高速铁路轨道谱进行比较。结果表明：中国高速铁路无砟轨道高低和方向不平顺谱均明显优于德国高速铁路低干扰轨道谱，更优于其高干扰谱，尤其在10～100 m 波长范围；不同线路状态的中国高速铁路无砟轨道水平和轨距不平顺谱与德国高速铁路水平和轨距不平顺谱在不同波长范围内各有优劣，除90％百分位数谱外，在中长波范围内，中国高速铁路无砟轨道水平和轨距不平顺谱优于德国高速铁路轨道谱；从时间样本来看，中国高速铁路无砟轨道不平顺谱幅值明显小于德国高速铁路低干扰和高干扰轨道谱；相同运营条件下，中国高速铁路无砟轨道不平顺谱对行车动力性能的影响最小，德国高速铁路低干扰轨道谱的影响次之，其高干扰谱的影响最大。由此可见，中国高速铁路无砟轨道几何状态优良，在其不平顺谱激扰作用下，高速车辆运行的轮轨动力学性能优秀。

In order to investigate the power spectrum density （PSD）of ballastless track irregularities of Chinese high -speed railway and its dynamic effect,the PSDs of Chinese ballastless track irregularities of different track states were analyzed,in terms of PSD,amplitude of time domain samples and dynamic effect.They were com-pared with the German high -speed railway spectrum.The results show that the PSDs of vertical profile irregular-ity and alignment irregularity of ballastless track of Chinese high -speed railway are better than the low disturb-ance spectrum of German high -speed railway,especially in 10 ~100 m wavelength range,more better than one’s high disturbance spectrum.The track spectra of ballastless track ittegularities of Chinese high -speed rail-way and the German high -speed railway spectrum have their advantages and disadvantages in different wave-length ranges in terms of track cross level and gauge irregularity.It is found that the Chinese high -speed bal-lastless track spectra of cross level and gauge irregularity are superior to those of German in the medium and long wavelength ranges.The Chinese 90% percentile spectrum of gauge irregularity is not good enough than that of German.The amplitudes of time domain samples of Chinese high -speed ballastless track spectra are much smal-ler than those of German high -speed railway low and high disturbance spectra.Compared with the German high-speed railway spectrum,the Chinese high -speed ballastless track spectra has minimal impact on vehicle dy-namic performances.Thus,it can be concluded that the geometrical states of Chinese high -speed ballastlesstrack is excellent,and the high -speed vehicle has good dynamic performances on it.