三种时频分析在复合材料无损检测中的应用  

Applications of Three Time-frequency Methods on Composite Material Damage Detection

作　　者：李迎[1] 

机构地区：[1]深圳职业技术学院机电工程学院,广东深圳518055

出　　处：《计测技术》2011年第6期1-3,20,共4页Metrology & Measurement Technology

基　　金：国家自然科学基金资助项目(50135030);航空科学基金资助项目(03I52067)

摘　　要：随着复合材料的广泛应用和现代信号处理技术的发展,时频分析方法已广泛应用于各类复合材料的损伤检测。将短时傅立叶变换、小波变换和黄氏变换三种时频分析技术经过Matlab编程,结合Lamb波应用于玻璃纤维增强的复合材料层合板的无损检测,并对三种时频结果进行比较与分析。结果表明:上述三种时频分析方法都能进行复合材料的损伤判定,但黄氏变换方法的分析精度更高。Along with the application of composite material and development of signal disposal,time-frequency method has gotten extensive application in composite material damage detection.In this paper,three time-frequency technology are discussed and programmed with Matlab,including STFT,wavelet transform and HHT.Taking Lamb wave as pumping signal,damage detection tests were process,and the three time-frequency technology are used to analyse the results.Experimental results show that the three time-frequency methods are effective,but HHT can achieve higher precision than the others in processing composite damage detection.

关 键 词：时频技术 短时傅立叶变换 小波变换 黄氏变换 复合材料损伤判定 

分 类 号：TN911.72[电子电信—通信与信息系统]