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Sensor Self-diagnosis Using A Modified Impedance Model For Active Sensing-based Structural Health Monitoring

机译：传感器阻抗自诊断的改进阻抗模型基于主动传感的结构健康监测

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摘要

The active sensing methods using piezoelectric materials have been extensively investigated for the efficient use in structural health monitoring (SHM) applications. Relying on high frequency structural excitations, the methods showed the extreme sensitivity to minor defects in a structure. Recently, a sensor self-diagnostic procedure that performs in situ monitoring of the operational status of piezoelectric (PZT) active sensors and actuators in SHM applications has been proposed. In this investigation, previously developed impedance models were revisited in order to investigate the effects of sensor and/or bonding defects on the admittance measurement. New parameters for sensor quality assessment of a PZT and coupling degradation effects between a PZT and bonding layer were incorporated into the traditional electromechanical impedance model for better estimation of the electromechanical impedance signatures and sensor diagnostics. The feasibility of the modified impedance model for sensor self-diagnosis using the admittance measurements was demonstrated by a series of parametric studies using a simple example of PZT-driven single degree of freedom spring-mass-damper system. This paper summarizes the description of the proposed modified electromechanical impedance model, parametric studies for impedance-based sensor diagnostics, and several issues that can be used as a guideline for future investigation.
机译：使用压电材料的主动传感方法已被广泛研究，以有效地用于结构健康监测（SHM）应用中。依靠高频结构激励，这些方法显示出对结构中微小缺陷的极端敏感性。近来，已经提出了一种传感器自诊断程序，该程序可以对SHM应用中的压电（PZT）有源传感器和执行器的运行状态进行原位监视。在这项研究中，重新研究了先前开发的阻抗模型，以研究传感器和/或键合缺陷对导纳测量的影响。传统的机电阻抗模型中加入了用于PZT传感器质量评估以及PZT与粘结层之间耦合耦合效应的新参数，以便更好地评估机电阻抗特征和传感器诊断。通过一系列参数研究，使用PZT驱动的单自由度弹簧-质量阻尼器系统的简单示例，进行了一系列参数研究，证明了使用导纳测量进行传感器自我诊断的改进阻抗模型的可行性。本文总结了对拟议的修改后的机电阻抗模型的描述，基于阻抗的传感器诊断的参数研究以及可以用作未来研究指南的几个问题。

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