文章摘要
陈维业,吴先梅,刘松,陈家熠.超声导波用于液层负载板损伤检测的数值模拟[J].声学技术,2020,39(1):49~54
超声导波用于液层负载板损伤检测的数值模拟
Numerical simulation of ultrasonic guided waves for damage detection of liquid layer loaded plate
投稿时间:2018-09-28  修订日期:2018-11-10
DOI:10.16300/j.cnki.1000-3630.2020.01.009
中文关键词: 超声导波  频散曲线  液层负载薄板  损伤检测  有限元模拟
英文关键词: ultrasonic guided wave  dispersion curve  liquid layer loaded thin plate  damage detection  Finite element simulation
基金项目:国家自然科学基金(11674351)资助项目
作者单位E-mail
陈维业 中国科学院声学研究所声场声信息国家重点实验室, 北京 100190
中国科学院大学, 北京 100049 
 
吴先梅 中国科学院声学研究所声场声信息国家重点实验室, 北京 100190
中国科学院大学, 北京 100049 
wuxm@mail.ioa.ac.cn 
刘松 中国科学院声学研究所声场声信息国家重点实验室, 北京 100190
中国科学院大学, 北京 100049 
 
陈家熠 中国科学院声学研究所声场声信息国家重点实验室, 北京 100190
中国科学院大学, 北京 100049 
 
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中文摘要:
      液层负载薄板结构的损伤检测是结构无损检测和健康监测中的一个重要问题。为寻求合适的液层负载薄板结构损伤检测信号及分析损伤缺陷对检测信号的响应,求解了双侧液层负载薄板的频散方程,计算得到4 mm双侧水域负载铝板的频散曲线,并利用有限元模拟方法研究了缺陷位置、角度及大小对铝板中检测信号的影响。研究结果表明:中心频率小于100 kHz的S0模式漏Lamb波衰减因子趋近于0,适合长距离损伤检测。此外,当缺陷的存在造成板结构的不对称性时,声信号在缺陷处发生明显的模式转换,且转换出的A0模式信号的透射系数随缺陷位置到板厚中心距离的增加而减小,随缺陷与铝板中间面的角度和缺陷长度的增加先增大后减小,并随缺陷宽度的增加而增大。
英文摘要:
      The damage detection of liquid layer loaded thin-plate structure is a key issue in structural nondestructive testing and health monitoring. In order to find a suitable damage detection signal of liquid layer loaded thin-plate structure and analyze the response of the damage defect to the detection signal, this paper solves the dispersion equation and calculates the dispersion curves of the 4 mm aluminum plate loaded by double sided semi-infinite water layers. Additionally, the effects of the position, angle and size of the defect on the acoustic detection signal in aluminum plate are investigated by using finite element simulation methods. The results show that the attenuation coefficient of the S0 mode leaky Lamb wave at the central frequency less than 100 kHz is close to zero, which is suitable for long-distance damage detection. When the presence of defects causes the asymmetry of the plate structure, the acoustic signal will have a significant mode transition at the defect. And, as the distance from the defect location to the center of the plate increases, the transmission coefficient of the converted A0 mode signal decreases, with the increase of the defect length and the angle between defect and medium layer, the transmission coefficient of the A0 mode signal increases first and then decreases; and with the increase of the defect width, the transmission coefficient of the A0 mode signal increases.
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