基于冲击回波的原木内部空洞位置检测方法研究

梁臣1,冯海林2,方益明2,李剑2

振动与冲击 ›› 2018, Vol. 37 ›› Issue (11) : 265-272.

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (11) : 265-272.
论文

基于冲击回波的原木内部空洞位置检测方法研究

  • 梁臣1,冯海林2,方益明2,李剑2
作者信息 +

Detection method for hole positions in logs based on impact echo

  • LIANG Chen1,FENG Hailin2,FANG Yiming2,LI Jian2
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文章历史 +

摘要

为了沿原木轴向快速检测内部空洞位置,提出一种基于原木应力波信号分解的冲击回波法。首先对原木内部采集的应力波信号进行集合经验模态(EEMD)分解,然后基于时域特征和分量相关系数相结合的方法找出对空洞敏感的固有模态函数(IMF)分量,最后对该固有模态函数进行傅里叶变换,根据频域特征实现原木内部空洞径向缺陷定位。实验结果表明,该方法能够较准确的对原木内部空洞进行定位。

Abstract

In order to quickly detect internal hole positions along the axial direction of a log, an impact echo method based on a log’s stress wave signal decomposition was proposed. Firstly, the collected stress wave signals in a log were decomposed with the ensemble empirical mode decomposition (EEMD) method. Then the intrinsic mode functions (IMFs) being sensitive to internal holes in a log were found based on their time domain characteristics combined with IMF components’ correlation coefficients. Finally, Fourier transformation was done for the found IMFs. According their frequency domain features, the positioning for log’s internal hole defect locations was realized. The test results showed that the proposed method is effective.
 

关键词

冲击回波法 / 原木 / EEMD / 相关系数

Key words

 impact echo method / log / EEMD / correlation coefficient

引用本文

导出引用
梁臣1,冯海林2,方益明2,李剑2. 基于冲击回波的原木内部空洞位置检测方法研究[J]. 振动与冲击, 2018, 37(11): 265-272
LIANG Chen1,FENG Hailin2,FANG Yiming2,LI Jian2. Detection method for hole positions in logs based on impact echo[J]. Journal of Vibration and Shock, 2018, 37(11): 265-272

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