Measurement of circumferential Lamb waves using a line-focus poly(vinylidene fluoride) transducer and cross correlation waveform analysis.
Measurement of circumferential Lamb waves using a line-focus poly(vinylidene fluoride) transducer and cross correlation waveform analysis.
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DOI：
10.1121/1.4931907
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
Chun-I Lin;Yan Lu;C. He;Guorong Song;Y. Lee
中科院分区：
文献类型：
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作者：
Chun-I Lin;Yan Lu;C. He;Guorong Song;Y. Lee
本文提出了一种测量在圆柱形弯曲薄板上传播的周向兰姆波的方法。使用宽带线聚焦聚偏二氟乙烯传感器以及散焦波形测量方法进行测量。合成获取的波形后，可以获得干涉图案，并开发互相关方法来准确提取波速作为波频率的函数。使用三块不同厚度（100、150 和 300 μm）、曲率半径为 10 mm 的不锈钢薄板，同时确定了周向兰姆波的几种基模和高阶模的色散曲线。还计算了理论色散曲线并与实验对应曲线进行了比较。观察到非常好的一致性，由此得出该测量方法的测量精度。
This paper presents a method for measuring circumferential Lamb waves propagating on a cylindrically curved thin plate. The measurement is carried out using a wideband and line-focused poly(vinylidene fluoride) transducer along with a defocusing waveform measurement method. After synthesizing the acquired waveforms, interference patterns can be obtained and a cross correlation method is developed to accurately extract the wave velocity as a function of wave frequency. Using three stainless steel thin plates of different thicknesses (100, 150, and 300 μm) and a radius of curvature of 10 mm, dispersion curves for several fundamental and higher order modes of circumferential Lamb waves are simultaneously determined. Theoretical dispersion curves are also calculated and compared with their experimental counterparts. Very good agreements are observed, which concludes the measurement accuracy of this measurement method.