Based on the equivalent elasticity method, the plane coupling vibration of a rectangular piezoelectric ceramic plate was studied and the resonant frequencyequation was derived out.
利用等效弹性法分析了压电矩形共振器的二维耦合振动，导出了振子共振频率的解析表达式。
2
This paper, on the viewpoint of Lorentz transformation of wavelength of lightwave, derives the frequencyequation of Doppler effect of light with tow methods.
本文从光波波长的洛仑兹变换出发用两种方法导出了光的多普勒效应的频率公式。
3
Based on equivalent four-terminal networks of the longitudinal ultrasonic transformer, the resonant frequencyequation and the amplitude magnification coefficient, with reactive load, are studied.