School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA.
IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Sep;57(9):2017-27. doi: 10.1109/TUFFC.2010.1649.
Surface-mountable wafer-type piezoelectric transducers using lead zirconate titanate (PZT) are widely used to generate and sense guided waves for nondestructive evaluation and structural health monitoring applications. However, little attention has been paid to monitoring PZT transducer integrity, despite possibly being the weakest link in the entire monitoring system. In this study, PZT transducer self-diagnostic techniques, which enable a single PZT transducer to examine its own integrity, are developed based on a time-reversal process; the effects of temperature and structural condition variations are explicitly considered. Two PZT self-diagnosis indices are proposed which allow debonded and cracked PZT conditions to be identified and distinguished from changing environmental and structural conditions. First, the proposed self-diagnosis schemes are theoretically formulated, and then the feasibility of the proposed schemes is validated through simulations and experimental tests under varying temperature and structural conditions.
使用锆钛酸铅(PZT)的表面贴装式晶圆型压电换能器广泛用于产生和感测导波,用于无损评估和结构健康监测应用。然而,尽管 PZT 换能器可能是整个监测系统中最薄弱的环节,但对其完整性的监测却很少受到关注。在这项研究中,基于时间反转过程开发了 PZT 换能器自诊断技术,使单个 PZT 换能器能够检查其自身的完整性;明确考虑了温度和结构条件变化的影响。提出了两个 PZT 自诊断指标,允许识别和区分从环境和结构条件变化的脱粘和开裂的 PZT 条件。首先,从理论上对所提出的自诊断方案进行了公式化,然后通过在不同温度和结构条件下的仿真和实验测试验证了所提出方案的可行性。