一种埋入型 PZT 的三维等效机电阻抗模型--第二部分：应用

摘要

基于建立的三维等效机电阻抗模型，文献的第一部分得到了PZT与结构耦合的电导纳方程。第二部分根据这一方程提出了应用机电阻抗（EMI）技术监测结构固有属性的改进方法。该方法通过 PZT 与结构耦合的电导纳方程，从实测的耦合电导纳信号中提取出结构等效机械导纳。利用获得的结构机械导纳曲线，来监测结构固有属性。基于该方法，对埋入有 PZT 传感器的早龄期混凝土梁的固有属性进行了监测。试验结果表明，利用结构机械导纳来监测结构固有属性是可行的，比原始电信号更加敏感有效。%Based on the proposed three-dimensional model of effective electromechanical impedance,the electromechanical admittance equation was derived in the companion article “Part I”.By using the theory of effective electromechanical impedance,a novel methodology for monitoring structural inherent properties was proposed here.The effective mechanical admittance of the host structure was extracted with the measurement of the coupled electromechanical admittance,and then the structural mechanical admittance was used to monitor the structural inherent properties.To investigate the feasibility of the proposed approach,a lab-scale concrete beam was utilized to monitor its strength gain during its early phase with the variations in the measurements of the effective electromechanical impedance.The results demonstrated the efficiency and feasibility of the proposed method.