Given the same random phase, the simulation of the sixth grade and fifth grade track irregularity PSD of U.S. railways shows the level of difference between them obviously.

• 该方法还可对美国轨道线路五级谱和六级谱进行数值模拟，在随机相位一致的情况下，直观地反映出不同轨道线路谱等级在时域波形上的不平顺差异水平。