HU Yong, XU Chun-guang, ZHOU Shi-yuan, et al. Research on time-frequency analysis in non destructive testing for laminated composite material[J]. 2009, 28(8): 14-17.
HU Yong, XU Chun-guang, ZHOU Shi-yuan, et al. Research on time-frequency analysis in non destructive testing for laminated composite material[J]. 2009, 28(8): 14-17. DOI: 10.13873/j.1000-97872009.08.001.
时频分析在复合材料无损检测中的应用研究
摘要
随着复合材料检测的发展
Lamb波无损检测技术日益受到重视。根据Lamb波多模式和频散的特点
以群速度—频厚积曲线为基础
采用短时傅利叶变换(STFT)的时频分析方法
以层合板复合材料为实验对象
与单独在时域、频域中分析相比较
结果表明:STFT可有效地识别Lamb波的传播模式
并可准确地对能量成分进行分析。
Abstract
Composite materials are used broadly in the domain of industry
and it is important to test those damages
especially non destructive testing.Based on the curve of group-frequency multiply thickness
a laminated plate is used as experimental object
Lamb waves are chosen as testing way
through time-frequency analysis
some effect of given defection in composite materials is determined.Compared with signal analysis which is based on time or frequency field respectively
time-frequency analysis can not only recognize Lamb waves mode
Detection of defects in composite plates using Lamb waves and novelty detection [J] . K. Worden,S. G. Pierce,G. Manson,W. R. Philp,W. J. Staszewski,B. Culshaw. International Journal of Systems Science . 2000 (11)