傅里叶变换
色散(光学)
度量(数据仓库)
快速傅里叶变换
振幅
兰姆波
傅里叶分析
光学
多模光纤
物理
波传播
声学
数学分析
数学
计算机科学
算法
数据库
光纤
作者
David Alleyne,P. Cawley
出处
期刊:Journal of the Acoustical Society of America
[Acoustical Society of America]
日期:1991-03-01
卷期号:89 (3): 1159-1168
被引量:825
摘要
A technique for the analysis of propagating multimode signals is presented. The method involves a two-dimensional Fourier transformation of the time history of the waves received at a series of equally spaced positions along the propagation path. The technique has been used to measure the amplitudes and velocities of the Lamb waves propagating in a plate, the output of the transform being presented using an isometric projection which gives a three-dimensional view of the wave-number dispersion curves. The results of numerical and experimental studies to measure the dispersion curves of Lamb waves propagating in 0.5-, 2.0-, and 3.0-mm-thick steel plates are presented. The results are in good agreement with analytical predictions and show the effectiveness of using the two-dimensional Fourier transform (2-D FFT) method to identify and measure the amplitudes of individual Lamb modes.
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