摘要
利用两维FFT对管道中传播的Lamb波模式进行了分析 .两维FFT系统包括激光探针 ,数字示波器 ,移动平台 ,计算机等 .由激光探针实现空间采样 ,由数字示波器实现时间采样 .借助于本系统 ,我们从实验上分析了铝管中传播的Lamb波模式 .实验结果与理论计算比较可以看出 ,两维FFT方法可以有效的对管道中传播的Lamb波模式进行定量分析 .
The Lamb wave modes propagating along a hollow cylinder are analyzed by means of two_dimensional (2?D) FFT. The 2?D FFT system consists of a laser probe and a digital oscilloscope. 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.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2002年第4期485-493,共9页
Journal of Nanjing University（Natural Science）
基金
Natural Science Foundation of Jiangsu Province,China (BK97026)
