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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Fracture source location in thin plates using the wavelet transform of dispersive waves
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Fracture source location in thin plates using the wavelet transform of dispersive waves

机译：利用色散波的小波变换对薄板中的裂缝源进行定位

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摘要

A new signal processing approach was presented for acoustic emission source location using the dispersive waves in a thin plate. For wave propagation in dispersive media, the accuracy of source location can be improved by using the arrival times of a single frequency component in the output signals at an array of sensors. The wavelet transform (WT) was used to resolve this problem. By utilizing the time-frequency data of the WT, the frequency-dependent arrival time traveling with the group velocity was shown to be easily determined. Experiments were performed using a lead break as the simulated fracture source on the surface of an aluminum plate. Two plate modes corresponding to the S/sub 0/ and A/sub 0/ Lamb waves were identified, and their group velocities were accurately measured. The source location results based on the WT method agreed well with the true locations. The WT method was also compared with the cross correlation technique, and both methods provide similar results.
机译：提出了一种使用薄板中的色散波定位声发射源的新信号处理方法。对于在分散介质中的波传播，可以通过使用单个频率分量在传感器阵列处的输出信号中的到达时间来提高源位置的精度。小波变换（WT）用于解决此问题。通过利用WT的时频数据，可以很容易地确定以群速度行进的与频率相关的到达时间。使用铅断裂作为铝板表面上的模拟断裂源进行了实验。确定了与S / sub 0 /和A / sub 0 / Lamb波相对应的两种板模式，并精确测量了它们的群速度。基于WT方法的源位置结果与真实位置非常吻合。 WT方法也与互相关技术进行了比较，两种方法都提供了相似的结果。

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