Structural health monitoring systems are employed to evaluate the state of structures to detect damage, bringing economical and safety benefits. The electromechanical impedance technique is a promising damage detection tool since it evaluates structural integrity by only measuring the electrical impedance of piezoelectric transducers bonded to structures. However, in real-world applications, impedance-based damage detection systems exhibit strong temperature dependence; therefore, variations associated with temperature changes may be confused as damage. In this article, the temperature effect on the electrical impedance of piezoelectric ceramics attached to structures is analyzed. Besides, a new methodology to compensate for the temperature effect in the electromechanical impedance technique is proposed. The method is very general since it can be applied to nonlinear (polynomial) temperature and/or frequency dependences observed on the horizontal and vertical shifts of the impedance signatures. A computer algorithm that performs the compensation was developed, which can be easily incorporated into real-time damage detection systems. This compensation technique is applied successfully to two aluminum beams and one steel pipe, minimizing the effect of temperature variations on damage detection structural health monitoring systems in the temperature range from −40°C to 80°C and the frequency range from 10 to 90 kHz.

中文翻译：

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使用多项式回归消除基于阻抗的结构健康监测系统中温度影响的方法

结构健康监测系统用于评估结构状态以检测损坏，带来经济和安全效益。机电阻抗技术是一种很有前途的损伤检测工具，因为它仅通过测量连接到结构的压电换能器的电阻抗来评估结构完整性。然而，在实际应用中，基于阻抗的损伤检测系统表现出很强的温度依赖性；因此，与温度变化相关的变化可能会被混淆为损坏。本文分析了温度对附着在结构上的压电陶瓷电阻抗的影响。此外，提出了一种新的方法来补偿机电阻抗技术中的温度效应。该方法非常通用，因为它可以应用于在阻抗特征的水平和垂直偏移上观察到的非线性（多项式）温度和/或频率依赖性。开发了一种执行补偿的计算机算法，可以很容易地将其合并到实时损坏检测系统中。这种补偿技术成功地应用于两根铝梁和一根钢管，在−40°C 至 80°C 的温度范围和 10 至 90 kHz 的频率范围内，最大限度地减少了温度变化对损伤检测结构健康监测系统的影响. 它可以很容易地集成到实时损坏检测系统中。这种补偿技术成功地应用于两根铝梁和一根钢管，在−40°C 至 80°C 的温度范围和 10 至 90 kHz 的频率范围内，最大限度地减少了温度变化对损伤检测结构健康监测系统的影响. 它可以很容易地集成到实时损坏检测系统中。这种补偿技术成功地应用于两根铝梁和一根钢管，在−40°C 至 80°C 的温度范围和 10 至 90 kHz 的频率范围内，最大限度地减少了温度变化对损伤检测结构健康监测系统的影响.