文档介绍：压电陶瓷的典型应用Typical application for piezoelectric ceramic
一、压电声响器Piezoelectric ceramic sounder
1、发声元件的结构The structure sounding element
罗宾逊和迪得逊对健康人的耳朵进行测验的结果,发现耳朵对3千赫左右的频率最为敏感。因此,压电陶瓷发声元件的谐振频率设计在3000Hz左右。,其外形尺寸为直径10-50毫米,-,发声元件挠曲振动,振动基波的谐振频率可由下式给出:
Robinson and Dixon tested the healthy human`s ears, they had found that the most sensitive frequency is 3KHz to human`s ear. So, the resonant frequency of piezoelectric ceramic sounder is 3KHz in design. Generally, using the structure as shown in , the diameter size is in 10-50 mm, the total thickness is in - mm. The sounder element will produce flexural vibration when the piezoelectric ceramic element input AC voltage. The resonant frequency of fundamental vibration wave is shown the formula.
C-振动片固定方式常数(,);
t-厚度;
r-半径;
Y0-杨氏模量;
ρ0-金属振动片和压电陶瓷片的合成密度。
因此,当材料一定时,压电陶瓷发声元件的频率与其总厚度成正比,与其半径平方成反比。.
C-The fixed mode constant of vibrator(Wave node fixed mode equal to , Circum node fixed mode equal to );
t- thickness; r- radii; Y0-Young modulus; ρ0- Metal disk and piezoelectric ceramic disk bining density
So, the frequency of piezoelectric ceramic sounder and the total thickness are direct proportion, and the quadratic radius is inversely proportion when the material is given. As shown in .
压电陶瓷发声元件的谐振频率随复合振动片直径的增加成指数曲线下降。发声