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首页> 外文会议>Conference on sensors and smart structures technologies for civil, mechanical, and aerospace systems >A Preliminary Study on the Prediction of Damaged Areas on Ordinary Concrete and Lightweight Concrete Using Electromechanical Impedance Technique with Different Frequency Ranges
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A Preliminary Study on the Prediction of Damaged Areas on Ordinary Concrete and Lightweight Concrete Using Electromechanical Impedance Technique with Different Frequency Ranges

机译：用不同频率范围的机电阻抗技术预测普通混凝土和轻质混凝土的破损面积的初步研究

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摘要

The electromechanical impedance (EMI) method for NDE uses a single piezoelectric material to act as an actuator and a sensor simultaneously, and the EMI method is suitable for structures with complex surfaces. However, this technique still has wide range of problems which needs to be investigated. For one, locating damaged areas on a host structure precisely is known to be extremely difficult as this non-model based technique heavily relies on the variations in the impedance signatures. In this study, an attempt to locate the damaged areas on an ordinary concrete panel and a lightweight concrete panel using bottom ash is carried out by using different frequency ranges. Since the sensing range decreases as the excitation frequency of piezoelectric material increases, one can possibly predict the damaged areas by analyzing the impedance signatures from different frequency ranges. Statistical analysis method such as root mean square deviation (RMSD) is applied to determine the changes of the experimental structures, and the RMSD values of low frequency range and high frequency range are compared to verify the relationship between the frequency range and sensing range. Furthermore, the applicability of this method to locating the damaged areas is investigated on various materials including the lightweight concrete.
机译：用于NDE的机电阻抗（EMI）方法使用一种压电材料同时充当致动器和传感器，并且EMI方法适用于具有复杂表面的结构。但是，该技术仍然存在广泛的问题，需要研究。首先，已知很难在主体结构上精确定位受损区域，因为这种基于非模型的技术严重依赖于阻抗特征的变化。在这项研究中，尝试通过使用不同的频率范围来定位普通混凝土面板和使用底灰的轻质混凝土面板上的受损区域。由于感测范围随压电材料激励频率的增加而减小，因此可以通过分析来自不同频率范围的阻抗信号来预测受损区域。采用均方根偏差（RMSD）等统计分析方法确定实验结构的变化，并比较低频范围和高频范围的RMSD值，以验证频率范围与感测范围之间的关系。此外，在包括轻质混凝土在内的各种材料上研究了该方法在定位受损区域上的适用性。

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