Paper Title:
Quantitative Identification of Defects in Lumber Based on Modal Frequencies and Artificial Neural Network
  Abstract

This study preliminarily discussed a new method to identify the location and size of internal wood defects using experimental modal analysis (EMA) and artificial neural network. The different defect sizes and locations were simulated by removing mass from intact wood specimens. At room temperature in the laboratory, free vibration testing was conducted to generate the frequency response functions (FRF) of intact and defective Korean Pine (Pinus koraiensis) wood specimens using fast Fourier transform (FFT) analysis system. The first three orders intrinsic frequencies were captured by picking up the location of each order peak of FRF curves. Then, two identification indexes developed by previous research were constructed based on these intrinsic frequencies, and they were used as input parameters to build the networks for localization and size determination of wood defects respectively. These two artificial neural networks were trained and tested for wood defects recognition. The research results showed that: (1) the intrinsic frequencies of defective wood were lower than those of intact wood; and (2) the constructed two identification indexes were capable to effectively detect the location and size of wood defects, which were more sensitive to large size defects than small size defects.

  Info
Periodical
Advanced Materials Research (Volumes 183-185)
Chapter
Materials Engineering
Edited by
Yanguo Shi and Jinlong Zuo
Pages
2279-2283
DOI
10.4028/www.scientific.net/AMR.183-185.2279
Citation
S. Y. Ni, H. D. Xu, L. H. Wang, "Quantitative Identification of Defects in Lumber Based on Modal Frequencies and Artificial Neural Network", Advanced Materials Research, Vols. 183-185, pp. 2279-2283, 2011
Online since
January 2011
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$32.00
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