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林业科学 ›› 2006, Vol. 42 ›› Issue (10): 91-94.doi: 10.11707/j.1001-7488.20061017

• 论文及研究报告 • 上一篇    下一篇

小波分析在中密度纤维板无损检测中的应用

王逢瑚 朱晓冬 孙建平   

  1. 东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040
  • 收稿日期:2005-12-27 修回日期:1900-01-01 出版日期:2006-10-25 发布日期:2006-10-25

Applications of Wavelet Analysis in the Nondestructive Test of Medium Density Fiberboard

Wang Fenghu,Zhu Xiaodong,Sun Jianping   

  1. Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education,Northeast Forestry University Harbin 150040
  • Received:2005-12-27 Revised:1900-01-01 Online:2006-10-25 Published:2006-10-25

摘要:

以中密度纤维板为试件,通过纵向共振和弯曲振动试验讨论小波分析方法用于无损检测的可行性。结果表明小波分析得到的中密度纤维板试件动弹性模量与常规弯曲静弹性模量在0.01水平下相关性非常显著,可以用小波分析方法测得的动弹性模量来表征常规弯曲静弹性模量;可以用小波分析的方法判断出试件是否有缺陷,小波分析在试件缺陷无损检测方面具有优越性。

关键词: 无损检测, 小波分析, 中密度纤维板, 弹性模量

Abstract:

The large numbers of nondestructive test signals of wood-base panel are complicated non-stationary time_varying signals. It is difficult for Fourier analysis to processing that. Wavelet analysis is the development of methods on signal processing and is an effective method for processign an unsteady signal. Taking the medium density fiberboard as the sample,discussed the feasibility of the applications of wavelet analysis in the nondestructive test wood-base panel. The main results were as follows: the longitudinal resonance modulus of elasticity that was measured by wavelet analysis can be the token of conventionality static modulus of elasticity because that had prominent correlation with static modulus of elasticity under the level of 0.01. The defects of samples can be judged by wavelet analysis that has superiority in the defect nondestructive test.

Key words: nondestructive test, wavelet analysis, medium density fiberboard, modulus of elasticity