基于小波再分配尺度谱的Lamb波时频特性研究

Research of lamb wave time-frequency characteristics based on wavelet reassignment scalogram

基于声—超声技术,对铝板中Lamb波的时频特性进行理论和实验研究,采用小波再分配尺度谱方法对铝板中Lamb波的时频特性进行实验研究和深入探讨,并对铝板中有无模拟损伤的情况做了对比研究和分析,研究相应Lamb波的信号特征,从而实现了铝板结构损伤监测的定性研究。

Based on acousto-ultrasonic technique, experimental studies are performed to explore the characteristics of the lamb wave produced in the aluminum plate. Mainly, the wavelet reassignment scalogram analysis is utilized to investigate the propagation characteristic of the lamb wave. Various comparing experiments and theoretical study are performed on the aluminum plates with and without artificial crack damage respectively. Some valuable results are obtained, and this provides some referable basis for further application research of acoustic-ultrasonic technique with respect to the area of the structure health monitoring.