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Structural impedance based damage diagnosis by piezo-transducers

机译：压电传感器基于结构阻抗的损伤诊断

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摘要

Although structural mechanical impedance is a direct representation of the structural parameters, its measurement is difficult at high frequencies owing to practical considerations. This paper presents a new method of damage diagnosis by means of changes in the structural mechanical impedance at high frequencies. The mechanical impedance is extracted from the electro-mechanical admittance signatures of piezoelectric-ceramic (PZT) patches surface bonded to the structure using the electromechanical impedance (EMI) technique. The main feature of the newly developed approach is that both the real as well as the imaginary component of the admittance signature is used in damage quantification. A complex damage metric is proposed to quantify damage parametrically based on the extracted structural parameters, i.e. the equivalent single degree of freedom (SDOF) stiffness, the mass, and the damping associated with the drive point of the PZT patch. The proposed scheme eliminates the need for any a priori information about the phenomenological nature of the structure or any 'model' of the structural system. As proof of concept, the paper reports a damage diagnosis study conducted on a model reinforced concrete (RC) frame subjected to base vibrations on a shaking table. The proposed methodology was found to perform better than the existing damage quantification approaches, i.e. the low-frequency vibration methods as well as the traditional raw-signature based damage quantification in the EMI technique.
机译：尽管结构机械阻抗是结构参数的直接表示，但出于实际考虑，在高频下很难对其进行测量。本文提出了一种通过在高频下改变结构机械阻抗来进行损伤诊断的新方法。机械阻抗是使用机电阻抗（EMI）技术从键合到结构的压电陶瓷（PZT）贴片的机电导纳签名中提取的。新开发的方法的主要特征是导纳签名的实部和虚部都用于损伤量化。提出了一种复杂的损伤度量，以基于提取的结构参数，即等效的单自由度（SDOF）刚度，质量和与PZT贴片的驱动点相关的阻尼，以参数化方式量化损伤。所提出的方案消除了关于结构的现象学性质或结构系统的任何“模型”的任何先验信息的需要。作为概念证明，本文报告了在模型混凝土框架（RC）上经受振动台基础振动的损伤诊断研究。发现所提出的方法比现有的损害量化方法（即低频振动方法以及EMI技术中基于传统原始签名的损害量化）性能更好。

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