压电机电阻抗结构损伤监测机理研究

基于压电-结构的机电阻抗模型,分析了模型中结构机械阻抗与压电传感器电阻抗之间的耦合关系。研究了压电机电阻抗测试法,并根据压电-结构模型中的机电阻抗谱研究损伤监测方法,给出了基本原理。利用在铝板上的测试和实验,验证了压电机电阻抗测试法及不同距离模拟损伤对压电机电阻抗谱的影响和变化趋势,探讨了阻抗分析技术用于损伤监测的可行性。研究与实验结果表明,在高激励频率作用下,随着损伤距离的变化,压电机电阻抗也会发生相同趋势的变化。

Study on Damage Monitoring Mechanism of Piezoelectric Impedance Structure

The coupling relationship between the structure mechanical impedance and the piezoelectric impedance of PZT sensor is analyzed based on the piezoelectric impedance model of the piezoelectric structure.We research the testing method on the piezoelectric mechanic impedance.The piezoelectric impedance testing method is studied and the basic principle is given according to the damage monitoring method on the electromechanical impedance spectrum research in the piezoelectric structure model.In this text,we test in the aluminium sheet,verify the testing method of piezoelectric and electromechanical and how various distance damage affect the piezoelectric electromechanical impedance spectrum.Above all, we research the feasible of impedance analysis method for damage monitoring. As the research result shows that PZT impedance will change with the distance of damage changing while it is excited by the high frequency.