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。
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, but also analyze energy component of each mode.
出处
《传感器与微系统》
CSCD
北大核心
2009年第8期14-17,共4页
Transducer and Microsystem Technologies
关键词
无损检测
复合材料
LAMB波
时频分析
non destructive testing
composite material
Lamb waves
time-frequency analysis
