对薄型材料中超声波传播规律进行分析，得到材料声速与共振频率的关系。
The relation between sound velocity and syntonic frequency is gained by analyzing the ultrasound transmitting in thin material.
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。
Based on the equivalent elasticity method, the plane coupling vibration of a rectangular piezoelectric ceramic plate was studied and the resonant frequency equation was derived out.
再用有限元软件ANSYS进行模态分析，确定了共振频率。
Finally, the modal analysis is obtained and the resonance frequency is determined by using finite element software ANSYS.
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