南京林业大学学报（自然科学版）2011，Vol.35Issue(6)：101-106,6.DOI:10.3969/j.issn.1000-2006.2011.06.021
胶合板加载损伤的声发射信号小波包特征提取
Feature extraction of acoustic emission signal of plywood in loading by wavelet package transform
摘要
Abstract
To identify the different damage types of plywood, a method based on time-frequency and proportion of energy was proposed for feature extraction of acoustic emission (AE) signal of plywood by combining the wavelet-packet time-frequency analysis with energy spectrum. The result showed that dilatational wave and flexural wave were the main modes of fracture signal from three-plywood outer with wide frequency spectrum, and the energy of signal was mainly concentrated in the first, second, third, fourth and seventh-band of the wavelet power spectrum. Rupture signals from table and the entire board of five plywood were mainly dominated by dilatational wave and flexural wave mode respectively, and the former frequency was unitary and amplitude was higher, the latter energy mostly focused on the first, second band. De-gumming and the entire board fault of three boards signals waveform were composed of dilatational wave and flexural wave and the latter was dominant, and signals energy mostly focused on the first, seconj, third and fourth band of the wavelet power spectrum. The test results revealed associative analysis of frogucncy spectrum, time-frequency map and wavelet packet energy spectrum could be used to identify AE signals cha'acteristics corresponding to various loading failure modes respectively.关键词
胶合板/声发射/小波包变换/信号特征Key words
plywood/ acoustic eiujssoion. Wjvelct package transform/ signal characteristic分类
通用工业技术引用本文复制引用
徐锋,刘云飞..胶合板加载损伤的声发射信号小波包特征提取[J].南京林业大学学报（自然科学版）,2011,35(6):101-106,6.基金项目
南京林业大学"十五"人才基金项目 （）
南京林业大学科技创新基金项目 （）
