Step four: the main frequency spectrum of the acoustic analysis.
步骤四：进行该声波主要频谱的分析。
Analyze the distribution of internal noise and main frequency ingredient with different speed.
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 reheating process for A356 aluminum alloy was conducted with main frequency induction furnace.
以A356合金为对象，采用中频电磁感应器进行了二次加热工艺的研究。
The flat-earth makes the main frequency of the interferogram not at the zero frequency, and can't 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。
The results showed that the main frequency of the earthquake wave produced by the source is higher obviously than ordinary seismic explosive columns.
结果表明，该震源激发地震波的主频率比普通震源的有明显提高。
The main frequency of vertical direction and horizontal tangential direction both have phenomenon of end amplification which doesn't afford the sadov's formula.
垂直方向主频和水平切向主频都存在着末端放大现象，这与萨道夫斯基公式不符。
The results show that the main amplitude, main frequency and frequency band of reflected wavelet and the effective dynamic range of system have different degrees of increase.
结果表明，改进后仪器接收到的地震反射波主振幅、主频率、频带宽度、垂向分辨率及仪器记录信号的有效动态范围均有不同程度的提高。
The results of model analysis indicated that the resonance phenomenon would not occur because the slope inherent frequency is well lower than the main frequency of blasting vibration.
模态分析结果表明，边坡的固有频率远低于爆破震动的主频，因此不会产生共振现象。
The signal's amplitude spectrum reveals that there are two main frequency, the higher is the probe signal's dominant frequency and the lower is the testing plane's free vibration frequency.
频谱分析表明测试信号中含有两个主频，分别对应发射探头的发射主频与测试面自振频率（采用ANSYS有限元程序作半空间体模态分析加以验证）；
The signal's amplitude spectrum reveals that there are two main frequency, the higher is the probe signal's dominant frequency and the lower is the testing plane's free vibration frequency.
频谱分析表明测试信号中含有两个主频，分别对应发射探头的发射主频与测试面自振频率（采用ANSYS有限元程序作半空间体模态分析加以验证）；
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