Feature extraction of wood-hole defects using wavelet-based ultrasonic testing

查看全文 作　　者：Huiming [1]Yang;Lei [1]Yu

机构地区：[1]Northeast Forestry University, Harbin 150040,People's Republic of China

出　　处：《Journal of Forestry Research》索引2017年第28卷第2期,共8页

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(2572016CB11 and 2572014CB35);Natural Science Foundation of Heilongjiang Province(F2015036 and QC2014C010);948 Project(2014-4-78) 摘　　要：The primary bottleneck to extracting wood defects during ultrasonic testing is the accuracy of identifying the wood defects. The wavelet energy moment was used to extract defect features of artificial wood holes drilled into 120 elm samples that differed in the number of holes to verify the validity of the method. Wavelet energy moment can reflect the distribution of energy along the time axis and the amount of energy in each frequency band,which can effectively extract the energy distribution characteristics of signals in each frequency band; therefore,wavelet energy moment can replace the wavelet frequency band energy and constitute wood defect feature vectors. A principal component analysis was used to normalize and reduce the dimension of the feature vectors. A total of 16 principal component features were then obtained, which can effectively extract the defect features of the different number of holes in the elm samples. 关键词：伍德表演抽取小浪精力时刻主要部件分析

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Feature extraction of wood-hole defects using wavelet-based ultrasonic testing

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