分析了不同车速工况下车内噪声的分布状况及主要频率成分。
From the calculating results, the main frequency of rail and sleeper lateral vibration is low.从计算结果可知,轨道结构的横向振动频率较低,且钢轨与轨枕的横向振动主频相接近。
The flat-earth makes the main frequency of the interferogram not at the zero frequency, and can reflect the change of the topographic altitude.平地效应使干涉纹图中的主要频率不在零频,不能反映实际地面高程的变化。