目前压电阻抗法应用中,锆钛酸铅压电陶瓷(PZT)片尺寸及粘贴位置选择的研究尚不充分。该文通过设计对比实验, 研究了PZT尺寸与粘贴位置对传感器导纳的影响机理。结果表明, 包含被测结构信息的局部密集峰主要分布在谐振频段; PZT尺寸越大, 谐振频段的局部密集峰越强。压电阻抗法中,PZT尺寸应结合检测频段包含谐振频段的原则来选择, PZT的粘贴位置将影响导纳曲线上的局部密集峰分布。研究结果为压电阻抗法应用中PZT的尺寸与粘贴位置选择提供了参考依据。

At present, there is a lack of research on the selection of PZT size and bonding location during the application of electro-mechanical impedamce technique. The influence of size and bonding location of PZT on the sensor admittance is investigated by designing the comparative experiment. The results show that the local peaks containing the information about the measured structure mainly occur around the resonance frequency bands. The larger the PZT size, the stronger the local dense peaks at the resonant frequency bands. The size selection in the electro-mechanical impedamce technique should have a combination of frequency range selection which should include resonance frequency bands. The bonding locations have an influence on the distribution of the local peaks in the admittance curve. The study results provide a reference for the size selection and bonding location determination of PZT in the application of the electro-mechanical impedamce technique.