Detection of Internal Voids in Wooden Components by Stress Waves

Li-hong CHANG; Wei QIAN; Hao CHANG; Xin LI; Jian DAI; Xiao-hong CHANG

doi:10.12326/j.2096-9694.2022009

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Detection of Internal Voids in Wooden Components by Stress Waves
1.College of Humanities and Urban-Rural Development，Beijing University of Agriculture，Beijing 102206，China
2.College of Architecture and Urban Planning，Beijing University of Technology，Beijing 100124，China
3.School of Mechanical and Precision Instrument Engineering，Xi’an University of Technology，Xi’an 710048，Shanxi，China
4.North China University of Technology，School of Architecture and the Arts，Beijing 100041，China
5.School of Accountancy，Beijing Wuzi University，Beijing 101149，China
Vol. 36, Issue 4, Pages: 70-76(2022)
DOI： 10.12326/j.2096-9694.2022009

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常丽红,钱威,常浩等.应力波对木构件内部空洞的检测[J].木材科学与技术,2022,36(04):70-76.

CHANG Li-hong,QIAN Wei,CHANG Hao,et al.Detection of Internal Voids in Wooden Components by Stress Waves[J].Chinese Journal of Wood Science and Technology,2022,36(04):70-76.
常丽红,钱威,常浩等.应力波对木构件内部空洞的检测[J].木材科学与技术,2022,36(04):70-76. DOI： 10.12326/j.2096-9694.2022009.

CHANG Li-hong,QIAN Wei,CHANG Hao,et al.Detection of Internal Voids in Wooden Components by Stress Waves[J].Chinese Journal of Wood Science and Technology,2022,36(04):70-76. DOI： 10.12326/j.2096-9694.2022009.

摘要

以冷杉为研究对象，利用应力波无损检测技术研究其在不同面积的空洞下应力波图像、波速衰减的变化规律，提出马氏距离用于检测空洞等级。结果表明：根据应力波图像可对木构件内部不同大小的空洞位置进行分析；但对内部空洞面积检测存在误差。提出内部不同空洞面积下，采用5条路径分析应力波波速衰减规律，利用马氏距离建立用于判别木构件内部空洞等级的模型，不仅可以判别小面积空洞，对大面积内部空洞检测也起判别的作用。该方法可以提高对木构件内部空洞位置、面积的判别，为木结构预防性保护及空洞检测提供依据。

Abstract

To evaluate the interior voids in wood components, the stress wave, a nondestructive testing technology was used to assess fir wood. The stress wave images were analyzed. The attenuation of the stress wave propagate through different voids areas were measured. In order to reduce the prediction error of discrimination, the Mahalanobis distance was proposed to detect the degree of voids. The results showed that the location of interior voids was detected through the stress wave images. According to the concept of Mahalanobis distance, five paths were used to analyze the attenuation law of the stress wave through different interior voids areas. A discrimination model was established to evaluate the degree of the interior voids in the wood components. The stress wave not only detected the voids of small area voids, but also assessed the large area interior voids. The method improves the measurement precision of the location and the area of the interior voids in the wood components, as well as provides a basis for the prevention and detection of the interior voids in the wood structures.

关键词

应力波波速木构件冷杉空洞

Keywords

stress wavewave velocitywood componentsfirvoids

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