一种埋入型 PZT 的三维等效机电阻抗模型--第一部分：理论

摘要

A three-dimensional effective electromechanical impedance model for embedded PZT transducers was proposed considering coupled vibration effects between a piezoelectric ceramic (PZT)patch and a host structure.The coupled electromechanical admittance equation was derived by adopting the concept of effective mechanical impedance for the piezoelectric materials.The equation reflected the contributions not only from PZT but also from the host structure. The theoretical electromechanical admittance of PZT under free-free condition was obtained with the equation,it was then utilized to extract the effective mechanical impedance of the host structure.%基于压电陶瓷（PZT）圆片三维耦合振动原理，建立了埋入型PZT传感器与基体结构相互作用的三维等效机电阻抗模型，扩大了机电阻抗（EMI）技术的应用范围。通过引入等效机械阻抗，利用压电材料的压电效应，得到了 PZT与结构耦合的电导纳方程。这一方程明确体现了 PZT 机械阻抗与结构机械阻抗对耦合电导纳的贡献。由此电导纳方程，可以得到自由 PZT 电导纳曲线，为结构等效机械阻抗的提取提供了基础。