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当前位置: 首页 > 文章 > 花旗松胶合木梁声发射信号及其传播特征研究 西北林学院学报 2017,32 (5) 197-201+251
Position: Home > Articles > Signal Propagation Characteristics of Acoustic Emission and Douglas Fir Glulam Beams Journal of Northwest Forestry University 2017,32 (5) 197-201+251

花旗松胶合木梁声发射信号及其传播特征研究

作  者：
李杨;罗廷芳;于帅帅;申丽娟;李明
单  位：
西南林业大学机械与交通学院
关键词：
花旗松;胶合木梁;声发射;小波分析
摘  要：
针对胶合木梁声发射无损检测问题,研究花旗松胶合木梁声发射信号时频域特征及其传播规律,以及微弱声发射信号的小波分析方法。首先采用NI高速数据采集设备及LabVIEW软件构建木材声发射信号采集平台,然后通过铅芯折断模拟声发射源,分析声发射信号在表面和厚度方向上的时频域特征及传播速率,最后针对铅芯滑动引起的微弱声发射信号,采用小波分析方法重构声发射信号波形。研究表明,采用铅芯折断模拟声发射源时,花旗松胶合木梁表面和厚度方向的声发射信号频率都集中在70kHz左右,且声发射信号沿表面传播速率更大,但沿厚度方向的信号衰减更加明显。对于"淹没"在噪声中的微弱声发射信号,采用小波分析的方法能够有效重构声发射信号波形。研究结果为花旗松胶合木梁声发射无损检测提供必要的基础理论依据。
译  名：
Signal Propagation Characteristics of Acoustic Emission and Douglas Fir Glulam Beams
作  者：
LI Yang;LUO Ting-fang;YU Shuai-shuai;SHEN Li-juan;LI Ming;School of Machinery & Transportation Engineering,Southwest Forestry University;
单  位：
School of Machinery & Transportation Engineering,Southwest Forestry University
关键词：
douglas fir;;glulam;;acoustic emission;;wavelet analysis
摘  要：
Aiming at the issue of nondestructive test of the beam made from the glued laminated timber(glulam)of Douglas fir(Pseudotsuga menziesii)based on acoustic emission(AE),time and frequency domain characteristics and propagation of the AE signals of the beam,as well as the application of wavelet analysis method to control the weak AE signals were investigated.Firstly,a wood AE signal acquisition platform was set up by using NI high speed data acquisition equipment and the LabVIEW software.Then the time domain characteristics and propagation velocity of AE signals in the surface and thickness direction by the simulation of AE source under lead core fracture were analyzed.Finally,the wavelet analysis method was used to reconstruct the waveform of AE signal for the weak AE signal caused by the sliding of the lead core.The results showed that the AE signal was mainly concentrated about 70 kHz in the beam when lead core fracture was used.The propagation velocity of AE signal was greater on the surface,but the signal attenuation along the thickness direction was more significant.In addition,as for the"weak"AE signals submerged in noise,the wavelet analysis method could effectively reconstruct the AE signal waveform.The results of the study could provide the necessary theoretical evidence for Douglas fir Glulam AE nondestructive test.

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