基于COMSOL的木材黏弹性声发射传播行为,仿真及其波速估计

卢芳勇; 李明; 方赛银; 邓婷婷; 杨龙飞; 沈志辉

doi:10.3724/j.gyjzG24040907

基于COMSOL的木材黏弹性声发射传播行为,仿真及其波速估计

doi: 10.3724/j.gyjzG24040907

1 西南林业大学机械与交通学院, 昆明 650224;
2. 安徽工程大学高端装备先进感知与智能控制教育部重点实验室, 安徽芜湖 241000;
3. 安徽工程大学电气工程学院,安徽芜湖 241000

基金项目:

国家科学自然基金项目(32160345,31760182)。

详细信息

作者简介:
卢芳勇,硕士,主要从事木材的无损检测,47347468@qq.com。

通讯作者:
李明,教授,swfu_lm@swfu.edu.cn。

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出版历程
- 收稿日期: 2024-04-09
- 网络出版日期: 2024-11-06

Simulations of Wood Viscoelastic Acoustic Emission Propagation Behavior and Wave Velocity Estimation Based on COMSOL Software

1. School of Machinery and Transportation, Southwest Forestry University, Kunming 650224, China;
2. Key Laboratory of Advanced Sensing and Intelligent Control for High End Equipment, Ministry of Education, Anhui University of Engineering, Wuhu 241000, China;
3. School of Electrical Engineering, Anhui University of Engineering, Wuhu 241000, China

摘要

摘要: 为了研究木材黏弹性特征对声发射(AE)信号传播行为的影响,在 COMSOL 软件中通过设定木材的黏度系数建立木材试件的有限元仿真模型,并结合木材 AE 试验结果验证了仿真模型的有效性。首先,在杉木试件表面距离左端面 100 mm 处通过信号发生器产生 Hanning 窗调制正弦脉冲信号,并在试件表面距离左端面 300 mm 处以 200 mm 间距放置 2 个 AE 传感器采集 AE 信号,再采用滤波器将传感器采集到的 AE 信号进行去噪处理。其次,对杉木试件进行有限元模拟,得到弹性波在试件中传播的位移云图和在黏弹性材料中的传播规律。最后,通过到达时间差法(Time Difference of Arrival,TDOA)对模拟仿真与试验测量得到的横纵波速度以及时域波形图进行对比。结果表明,模拟仿真所得横纵波速度分别为 1 118 m / s 和 5 245 m / s, 试验所得横纵波速度分别为1 290 m / s 和 5 209 m / s。将仿真模拟波形信号图与试验实测波形图进行对比,其幅值衰减与信号时域波形图都较为吻合。因此,证实了黏弹特性对杉木试件的影响以及仿真模型的有效性。
- 木材 /
- 声发射 /
- 有限元分析 /
- 传播速度 /
- 黏弹性
Abstract: In order to study the influence of wood viscoelasticity characteristics on the propagation behavior of acoustic emission (AE) signals, a finite element simulation model of wood specimens was established by setting the viscosity coefficients of wood in COMSOL software. The effectiveness of the simulation model was verified by combining the results of wood AE experiments. Firstly, a Hanning window modulated sine pulse signal was generated by a signal generator at a distance of 100 mm from the left end face on the surface of the fir specimen. Two AE sensors were placed at a distance of 200 mm from the left end face at a distance of 300 mm on the surface of the specimen to collect the AE signals. Then, a filter was used to denoise the AE signals collected by the sensors. Secondly, finite element simulations were conducted on the fir specimen to obtain the displacement cloud map of elastic wave propagation in the specimen and the propagation law in viscoelastic materials. Finally, the time difference of arrival (TDOA) method was used to compare the transverse and longitudinal wave velocities and time-domain waveforms obtained from the simulations and experimental measurements. The results showed that the simulated transverse and longitudinal wave velocities were 1 118 m/s and 5 245 m/s, and the experimental transverse and longitudinal wave velocities were 1 290 m/s and 5 209 m/s, respectively. The amplitude attenuation and the time-domain waveforms were in good agreement when comparing the simulated and measured waveforms with the experimental waveforms. Therefore, the effects of viscoelasticity on Chinese fir specimens and the validity of the simulation model were confirmed.
- wood /
- acoustic emission /
- finite element analysis /
- propagation speed /
- viscoelasticity

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