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An enhanced piezoelectric impedance approach for damage detection with circuitry integration

机译：一种增强的压电阻抗方法，用于通过电路集成进行损伤检测

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摘要

Due to their two-way electromechanical coupling, piezoelectric transducers can be used for impedance or admittance-based damage detection, in what is hereafter referred to as the piezoelectric impedance-based approach. Such an approach has been recognized as being sensitive to small-sized damage, as the piezoelectric impedance or admittance can be measured at relatively high frequencies. In an earlier work we have demonstrated that integrating a tunable inductor with the piezoelectric transducer to form an inductive resonant circuit can amplify both the admittance measurement magnitude and the damage-induced admittance anomaly. In this research, we investigate further enhancing the piezoelectric impedance approach for damage detection by means of circuitry integration. In particular, we introduce a negative capacitance element into the inductive circuitry, and then explore an alternative circuitry topology. It is demonstrated that the negative capacitance can broaden the measurement amplification effect due to the circuitry resonance to a much wDEer frequency range, thereby increasing the damage detection accuracy and sensitivity. It is also verified that, compared to the previous serial connection between the inductor and the resistor (used to facilitate the admittance measurement), a parallel connection of these two elements can amplify the voltage drop across the resistor, which increases the signal-to-noise ratio in the sensor measurement. Extensive numerical and experimental studies are carried out to illustrate the effectiveness of our proposed enhancements.
机译：由于它们的双向机电耦合，因此压电换能器可用于基于阻抗或导纳的损伤检测，以下称为基于压电阻抗的方法。由于可以在相对较高的频率下测量压电阻抗或导纳，因此这种方法已被视为对小尺寸损伤敏感。在较早的工作中，我们证明了将可调电感器与压电换能器集成在一起以形成电感谐振电路可以同时放大导纳测量幅度和损伤引起的导纳异常。在这项研究中，我们研究通过电路集成进一步增强压电阻抗方法以进行损伤检测。特别是，我们将负电容元件引入感应电路中，然后探索另一种电路拓扑。事实证明，由于电路谐振在很大的频率范围内，负电容可以扩大测量放大效果，从而提高了损伤检测的准确性和灵敏度。还证实，与之前的电感器和电阻器之间的串联连接（用于促进导纳测量）相比，这两个元件的并联连接可以放大电阻器上的压降，从而增加了信号对传感器测量中的噪声比。进行了广泛的数值和实验研究，以说明我们提出的增强功能的有效性。

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