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。
If the main frequency is near or equal to self vibration of multiplayer construction, the resonate may be occurred, then multiplayer construction will be severity destroyed.
如主频率低到接近或等于多层建筑的自振频率，则有可能发生共振现象，致使多层建筑遭受严重破坏。
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。
If the cross terms of the spatial frequencies for the unit cell of periodical object are much smaller than the main frequency terms, the restriction of the Angle is not necessary.
当周期物体的单胞空间频率交叉项比主频率项小到可忽略的程度时，角度限制失效。
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）；
This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
The main effect of these additional observations is a 100-point increase in the frequency count for each response alternative.
这些额外调查对象的主要影响是，使得每个回答情形的频率计数增加了 100点。
But some of those precious minutes would be saved by making fewer stops, while train frequency on the traditional west-coast main line will be cut.
但是，这几分钟的宝贵时间将通过减少停靠站的方式节省下来，而传统的西海岸主干线的列车班次会减少。
The main goal of this study was to determine the frequency and degree of recovery or worsening of vestibular function over time.
本研究的主要目的是确定随着时间的推移前庭功能的恢复或恶化频率与程度。
When daily use will cause some wear and tear epoxy floor, so we must use some of the main issues, do not stress, do not use corrosive stuff, all kinds of forklifts, hydraulic car use frequency.
环氧地坪的日常的使用时会造成一些磨损和破坏，所以我们一定主要一些使用事项，不要重压，不要使用带腐蚀性的东西，各种叉车、液压车的使用频率等。
As the listed company finance report is used as the main carrier of its information, its form, contents and frequency of disclosure is the common concerns of theory field and practice field.
上市公司财务报告作为信息的主要载体，其披露形式、内容及频率便成为理论界与实务界共同关注的热点。
Then a new type of structural optimization is proposed by employing one of the main indexes of structural dynamic characters i. e. natural frequency.
在此基础上，引入结构动特性的主要指标之一的结构固有频率，提出了一种新的结构优化形式。
The main analytical method of unsteady flow in pipelines includes frequency domain analysis and time domain analysis.
管道中非稳定流动的分析方法主要有频域法和时域法。
The' main factors resulting in local frequency tracking error are analyzed based on the principles of the tracking local oscillator for frequency agile radars of rotary tuning magnetron type.
本文从旋转变频磁控管式频率捷变雷达的本振频率跟踪原理出发，分析了产生本振频率跟踪误差的主要因素。
The main food affecting physical development of 7~12 month rural children was grain, egg and intake frequency.
影响7~12月儿童体格发育主要食物是谷类、鸡蛋及其摄入频率。
There are two main alternatives, Direct Sequence Spread Spectrum and Frequency Hopping Spread Spectrum.
主要有两种选择，直接序列扩频和跳频扩频。
Sized eight (854), frequency of Scholars, notes Collator, Ren Nanling County main book, has been promoted to martial magistrate.
大中八年（854），频中进士，调校书郎，任南陵县主簿，又升任武功县令。
Automatic governing test of voltage and frequency for main generator (emergency generator).
主发电机(应急发电机)电压、频率自动调节试验。
Main dynamic performance is as follows, frequency response characteristic and steps response characteristic.
主要的动态性能有：频率响应特性和阶跃响应特性。
Maintenance department: maintenance industries circuit boards, machine equipment system, main board, controller, power supply, frequency converter, PLC and touch screen.
维修部：维修各行业电路板，机加工设备系统，主板，控制器，电源，变频器，PLC触摸屏等。
The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
The paper presents a SPWM frequency variable and velocity variable system with SCR as main switching devices. The proposed scheme has been verified through experiment.
介绍一种以SCR作主开关器件的SPWM控制方式的变频调速系统，并通过实验对提出的方案进行了验证。
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