A technique for improving the damage detection ability of the electro-mechanical impedance method on concrete structures
A technique for improving the damage detection ability of the electro-mechanical impedance method on concrete structures
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DOI：
10.1088/0964-1726/21/8/085024
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发表时间：
2012-07
影响因子：
4.1
通讯作者：
S. Na;H. K. Lee
中科院分区：
文献类型：
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作者：
S. Na;H. K. Lee
到目前为止，一种被称为机电阻抗(EMI)方法的相对较新的无损评估技术在局部损伤检测中显示出了良好的结果。然而，阻碍其商业化的重大问题仍然存在。首先，在大型混凝土结构上使用电磁干扰方法来检测损伤是非常困难的，因为阻抗特征中没有多个峰值，导致在受到任何损伤后都会产生模糊的变化。这种微小的变化可能会增加损害识别中的不确定性，因为其他因素也可能导致签名的变化。在这项研究中，提出了一种技术来解决上述问题，以允许更高的阈值，显著提高了阻抗签名受到破坏时的灵敏度。实验表明，该方法对混凝土损伤检测是非常有效的，提高了EMI方法的损伤检测性能。
To date, a relatively new non-destructive evaluation technique known as the electro-mechanical impedance (EMI) method has shown promising results in local damage detection. However, major issues still exist which are holding back its commercialization. For one, using the EMI method on large concrete structures to detect damage can be very difficult due to the absence of multiple peaks in the impedance signature, resulting in a vague change after subjection to any damage. Such minor variations can increase the uncertainties in damage identification, as other factors may also contribute to the changes in the signature. In this study, a technique is proposed to solve the aforementioned problem to allow a higher threshold value by significantly increasing the sensitivity of the impedance signature when subjected to damage. Experiments have shown that the proposed technique is very effective for concrete, enhancing the damage detection performance of the EMI method.