南京大学学报（自然科学版）2002，Vol.38Issue(4)：485-493,9.
管道中Lamb波两维FFT模式分析
Mode Analysis of Lamb Wave in Hollow Cylinder by Means of 2-D FFT
摘要
Abstract
The Lamb wave modes propagating along a hollow cylinder are analyzzed by means of twodimensional (2-D) FFT. The 2-D FFT system consists of a laser probe and a digital cs, cilloscope. The former implements the spatial sampling of the waveform and the latter does its temporal sampling.With the aid of this system, the Lamb wave modes propagating along an aluminum alloy tube are analyzed experimentally. The Lamb waves are excited by so called edge excitation, i.e., by directly bonding bulk wave transducers to one end of the tube. The experimental results are reported. The comparison between the experiments and calculations shows that the 2-D FFT can be effectively used to analyze quantitatively Lamb wave modes in hollow cylinders and nearly single mode excitation can be realized by means of edge excitation.关键词
Lamb波模式/两维FFT分析/边缘激发Key words
Lamb wave modes, 2-D FFT, edge excitation分类
数理科学引用本文复制引用
孙宗琪,毛一葳,姜文华..管道中Lamb波两维FFT模式分析[J].南京大学学报（自然科学版）,2002,38(4):485-493,9.基金项目
Natural Science Foundation of Jiangsu Province, China (BK97026) （BK97026）
