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首页> 外文期刊>Smart Materials & Structures >Extraction of patch-induced Lamb waves using a wavelet transform
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Extraction of patch-induced Lamb waves using a wavelet transform

机译：利用小波变换提取斑块诱发的兰姆波

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An attempt is made herein to locate the fundamental anti-symmetric Lamb wave in lead zirconium titanate (PZT) integrated beams using a wavelet transform. The Lamb wave was generated by feeding to a surface-mounted PZT patch a voltage in the form of sine bursts. The actuating burst consists of a small number of cycles ranging from 2.5 to 4.5 cycles. The wave propagation was monitored by two miniature accelerometers. A type of continuous wavelet transform employing the Gabor wavelet was applied to extract the dominant wave group from the measured acceleration signals. On the basis of the frequency and speed of the extracted wave, the flexural modulus was determined. Wave speed measurement was performed on an aluminum beam and a brass beam. The moduli thus characterized were compared with the reference values, as obtained by the resonant beam method. Such a comparison provides a means to assess the effectiveness of the wave extraction process. It was found that the patch-induced Lamb wave exhibited a frequency higher than that of the actuating sine bursts. Hence, the correct frequency value should be employed in order to achieve an accurate characterization of the flexural moduli. Moreover, a successful wave extraction process requires an appropriate frequency term in the Gabor wavelet. With the above considerations, the characterized moduli harbor a range of error from 1.3% to 5.1%, thus signifying the effectiveness of the wave extraction process.
机译：本文尝试使用小波变换在钛酸铅锆（PZT）集成光束中定位基本反对称Lamb波。兰姆波是通过将正弦脉冲形式的电压馈送到表面安装的PZT贴片而产生的。促动脉冲串由少数几个周期组成，范围从2.5到4.5个周期。通过两个微型加速度计监视波的传播。应用了一种采用Gabor小波的连续小波变换，以从测得的加速度信号中提取主导波组。根据提取波的频率和速度，确定弯曲模量。在铝梁和黄铜梁上进行波速测量。将如此表征的模量与通过共振束法获得的参考值进行比较。这种比较提供了一种评估波提取过程有效性的方法。已发现，斑片诱发的兰姆波的频率高于激励正弦脉冲的频率。因此，应采用正确的频率值，以实现弯曲模量的准确表征。此外，成功的波提取过程需要在Gabor小波中使用适当的频率项。基于上述考虑，特征模量的误差范围为1.3％至5.1％，因此表明了波提取过程的有效性。

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