School of Mechanical Engineering and Automation, Beihang University, Beijing, China.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Jul;58(7):1442-51. doi: 10.1109/TUFFC.2011.1963.
Harmonic generation is a promising technique for measuring small changes in the microstructure of components. Its extreme sensitivity is a benefit for detection, but results in a high degree of variability in any measurements taken. This paper characterizes the effects of experimental variables throughout the measurement signal path, establishing their relative importance and making suggestions for the best way to take measurements using harmonic generation. A model is used to predict the harmonic amplitude as a function of position and thereby account for alignment inaccuracy, explaining the effects of this key experimental variable. Finally, the potential effect of all of the variables on damage detection is discussed.
谐波产生是一种很有前途的技术，可以测量组件微观结构的微小变化。其极高的灵敏度有利于检测，但也导致任何测量结果的变异性很大。本文通过对整个测量信号路径中的实验变量进行特征描述，确定了它们的相对重要性，并就如何使用谐波产生进行最佳测量提出了建议。采用模型预测了谐振幅值作为位置的函数，从而解释了这种关键实验变量的影响。最后，还讨论了所有变量对损伤检测的潜在影响。
