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首页> 外文期刊>Mechanical systems and signal processing >Analysis of sound and vibration interaction on a crack and its use in high-frequency parameter selection for vibro-acoustic modulation testing
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Analysis of sound and vibration interaction on a crack and its use in high-frequency parameter selection for vibro-acoustic modulation testing

机译：裂缝的声音和振动相互作用分析及其在振动声调制测试的高频参数选择中的应用

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摘要

Vibro-acoustic modulation (VAM) is a sensitive nonlinear method used to nondestructively detect cracks and other contact-type defects in materials and structures. However, the modulation between two excitation signals in a structure has not been investigated well. In this study, the interactions between the ultrasound (probing), vibration (pumping), and crack are investigated. Using aluminum beam samples, a sweep signal is used as the probing excitation, and synchronic demodulation and a short-time Fourier transform are used to extract the modulation from the output signal. The results demonstrate that the modulation can be affected by the crack position when it is located at the longitudinal resonance node point x_0 = L m (where L is the beam length, n is the mode number, m is an integer, and 1 ＜ m ＜ n), and both the modulation at the multiples of the number n-order resonance frequencies and peaks on the side of these resonances are much lower. It is also demonstrated that the modulation peak values occur on both sides of the high-frequency structure response resonances. The modulation peak frequencies change with the pumping amplitude; however, the variation is too small to affect the probing frequency selection in our experimental setup. Further analysis suggested that the nonlinear spring model is appropriate for crack simulations to predict modulation distribution and select parameters. The VAM technique exhibited the best crack sensitivity when the probing frequency was selected as the sum or difference of the resonance and pumping frequency. To lock this optimum probing frequency, the minimum sweep range should be twice the beam longitudinal fundamental frequency. Further, the energy dissipation in the crack interface also plays an important role in the modulation and has the potential to be used for crack size estimation with proper excitation. All of the obtained results will aid in understanding the modulation mechanism and making further improvements to the reliability and efficiency of the VAM technique.
机译：振动声调制（VAM）是一种敏感的非线性方法，用于无损检测材料和结构中的裂缝和其他接触型缺陷。然而，结构中的两个激励信号之间的调制尚未得到研究。在该研究中，研究了超声（探测），振动（泵送）和裂纹之间的相互作用。使用铝束样品，使用扫描信号作为探测激励，并且使用同步解调和短时傅里叶变换来从输出信号中提取调制。结果表明，当它位于纵向谐振节点点X_0 = L M / N时，调制可以受裂缝位置的影响（其中L是光束长度，n是模式编号，M是整数，1

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