The Application of Modal Analysis in Hole-Defect in Lumber

Abstract:

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Larch lumbers were tested by using modal analysis technology and Frequency response functions (FRF) were derived. Modal parameters, including first 4 intrinsic frequency and first 3 modal shape, were distinguished by single modal method. Research shows that the intrinsic frequency of hole-defect lumbers is little lower than standard lumbers’ and the change rate of frequency is becoming larger gradually with the diameter of hole-defect. However, it can not judge the position of the hole-defect by the change rate of frequency. The modal shape of the node near the hole-defect always jumps abruptly, so it can estimate the particular position of hole-defect in the lumber. The variation of modal shape is becoming larger gradually with the diameter of hole-defect. It can make qualitative and quantitative estimate to the hole-defect in the lumber by considering intrinsic frequency and modal shape together.

Info:

Periodical:

Key Engineering Materials (Volumes 467-469)

Edited by:

Dehuai Zeng

Pages:

1776-1780

DOI:

10.4028/www.scientific.net/KEM.467-469.1776

Citation:

S. Q. Song et al., "The Application of Modal Analysis in Hole-Defect in Lumber", Key Engineering Materials, Vols. 467-469, pp. 1776-1780, 2011

Online since:

February 2011

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Price:

$35.00

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