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PIEZOGENERATED ELASTIC WAVES FOR STRUCTURAL HEALTH MONITORING

机译：压电弹性波用于结构健康监测

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摘要

The purpose of the presented study is to demonstrate experimentally the feasibility of nondestructive damage detection by an array of piezotransducers embedded or bonded to the surface of a monitored structure. This paper shows the results of experiments with transmission of elastic waves among systems of piezotransducers surface-bonded to aluminum and concrete plates, and embedded in a concrete block. Structural damages were simulated by masses of various magnitudes placed at the surface of tested specimens, and by drilled holes. Experimental results obtained so far indicate that there is a strong correlation between the size and location of a simulated damage and the character of signals transmitted among piezotransducers. Anomalies in those signals are repeatable and have distinct characters when they are caused by a simulated damage and when they are due to other causes. Piezotransducers used in this study were able to produce and receive signals well above the noise level both when surface-bonded to aluminum specimens and when embedded in a concrete block. The anomalies caused by simulated damages were significant enough to be used for training a neural network.
机译：本研究的目的是通过实验证明通过嵌入或结合到受监测结构表面的压电换能器阵列进行无损损伤检测的可行性。本文展示了在表面结合到铝和混凝土板上并嵌入混凝土块中的压电换能器系统之间传播弹性波的实验结果。结构损伤是通过放置在测试样品表面的各种大小的质量和钻孔来模拟的。迄今为止获得的实验结果表明，模拟损伤的大小和位置与压电换能器之间传输的信号的特性之间存在很强的相关性。这些信号的异常是可重复发生的，并且当它们是由模拟损坏引起的，或者是由于其他原因引起的，则具有明显的特征。本研究中使用的压电换能器，无论是表面粘结到铝样品上还是嵌入混凝土块中，都能够产生并接收远远高于噪声水平的信号。由模拟损坏引起的异常足够显着，可用于训练神经网络。

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