Low frequency and boundary condition effects on impedance based damage identification

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI:10.1016/j.csndt.2014.05.001

C. Bharathi Priya , A. Likhith Reddy , G.V. Rama Rao , N. Gopalakrishnan , A. Rama Mohan Rao

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引用次数: 19

Abstract

Details of the investigations on the application of Electro Mechanical Impedance (EMI) technique using smart piezoelectric (PZT) sensors for damage detection of structures are presented in this paper. The behavior and the ability of this method to detect damages, in a homogenous material are studied for its effective utilization in structural health monitoring. Experimental investigations are conducted on a homogenous aluminium plate bonded with PZT patches to study the effects of external low frequency vibrations (mass loading) and boundary condition on EMI signatures and the observations are discussed using RMSD as damage index computed between pristine and damaged states. Effect of low frequency vibration on the resulting EMI signature and the corresponding RMSD is found to be less than 2%. This is the threshold upper control value (UCL) beyond which the change in RMSD shall truly reflect the damage.

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低频和边界条件对阻抗损伤识别的影响

本文详细介绍了利用智能压电(PZT)传感器进行机电阻抗(EMI)技术在结构损伤检测中的应用研究。研究了该方法在均质材料中检测损伤的性能和能力，以期在结构健康监测中得到有效的应用。实验研究了外部低频振动(质量载荷)和边界条件对电磁干扰信号的影响，并使用RMSD作为原始状态和损坏状态之间计算的损伤指数对观察结果进行了讨论。低频振动对产生的电磁干扰特征和相应的RMSD的影响小于2%。这是阈值上限控制值(UCL)，超过此值RMSD的变化应真实反映损害情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case Studies in Nondestructive Testing and Evaluation

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