If the numerical value line resonance frequency plus some shaft connatural frequency of generator is equal to operation frequency , it brings about coupling resonance between generator and system , which maybe results in shaft rupture of synchronous generators 当线路电气谐振频率与同步电机的轴系某一固有振荡频率近似互补于电网工频时，将导致机电系统的耦合振荡，严重的会造成同步发电机大轴的扭断。
30mhz measurement of quartz crystal unit parameters by zero phase technique in a - network ; part 4 : method for the measurement of the load resonance frequency fl load resonance resistance rl and the calculation of other derived values of quartz crystal units , up to 30 mhz 用型网络的零相位技术测量石英谐振器参数.第4部分:石英晶体元件负荷谐振频率fl负荷谐振电阻rl的测量方法,以及石英晶体元件其他导出值的计算方法
30 mhz measurement of quartz crystal unit parameters by zero phase technique in a pi - network - part 4 : method for the measurement of the load resonance frequency fl , load resonance resistance rl and the calculation of other derived values of quartz crystal units , up to 30 mhz 用型网络的零相位法测量石英晶体元件参数.第4部分:石英晶体单元负荷谐振频率fl负荷谐振电阻rl的测量方法及其他石英晶体元件导出值的计算方法
In chapter 6 , the new half - complex wavelet is adopted to diagnosis defects of rolling bearings . inherent resonance frequency can be found out by time - frequency analysis with half - complex wavelet , and high frequency resonance analysis is implemented with half - complex wavelet to locate the failure 第六章通过半复小波对轴承振动信号进行连续小波变换确定轴承检测系统的固有共振频率，实现轴承故障的高频共振分析，并确定故障的种类和部位。
Third , the whole absorption spectrum displays , in general , three pairs of absorption peaks and three pairs of gain peaks . due to the coherences between dressed states , these peaks are not exactly at the resonant resonance frequencies between dressed states , but in the vicinity of them 还有一个特征就是，吸收光谱在一般情况下会出现三对吸收峰和三对增益峰，在修饰态相干的作用下，这些峰并不是位于修饰态共振跃迁频率处，而是位于它们邻域附近。
It is comprised of a sensor head ( a quadrangular pyramid tip , a base , four quartz crystal plates ) and a network analyzer and an apparatus to apply three - axis force . according to mechanics , four plates of the quadrangular pyramid tip correspondingly receive four one - dimension forces when applying a three - axis force to the sensor head . because quartz crystal has a force - frequency effect , namely , resonance frequency change of the quartz crystal is in direct proportion to one - dimension forces applying to it , four certain resonance frequency changes of the four quartz crystal plates are corresponding to a three - axis force 当传感头受三轴力作用时，根据力学的分析可以确定三轴力与四角锥体四个面上单向力之间的对应关系，用分别贴在四角锥体四个面上的四片压电石英晶体作为压敏元件，由于石英晶体的力频效应（即石英晶体在受到应力作用时，它的谐振频率与应力大小成正比） ，从而最终确定了四片石英晶体的谐振频率改变量与传感头上所受三轴力大小和方向之间的对应关系。
On perturation theory resonant cavity model is built by fdtd dividing grids of resonant cavity space and solving them . on the base of the model , electromagnetic fields distribution inside and outside of resonant cavity , also noload resonance frequency and cover material ’ s influences on measurement precision are analyzed 提出了一种基于同轴谐振腔微扰原理的谐振微波传感模型,从谐振腔微扰原理出发,利用时域有限差分法( fdtd )对谐振腔空间进行网格划分并求解,建立了谐振腔传感模型。
