文章摘要
刘会彬,郑阳,郑晖,邬冠华.超声波散射有限元模型中单一模态入射研究[J].声学技术,2016,35(2):129~136
超声波散射有限元模型中单一模态入射研究
Single mode incident for finite element model of ultrasonic scattering
投稿时间:2015-07-08  修订日期:2015-08-25
DOI:10.16300/j.cnki.1000-3630.2016.02.009
中文关键词: 超声波|散射|有限元|合成点源|单一模态激励
英文关键词: ultrasonic wave|scatter|finite element|resultant sources|single mode excitation
基金项目:质检总局科技计划项目(2014QK252);质检公益性行业科研专项项目(201410026)
作者单位E-mail
刘会彬 南昌航空大学无损检测技术教育部重点实验室, 江西南昌 330063
中国特种设备检测研究院, 北京 100029 
 
郑阳 中国特种设备检测研究院, 北京 100029 zhengyangchina@126.com 
郑晖 中国特种设备检测研究院, 北京 100029  
邬冠华 南昌航空大学无损检测技术教育部重点实验室, 江西南昌 330063  
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中文摘要:
      超声波在缺陷处的散射行为分析中,研究单一模态与缺陷的作用极为重要。通过在多个节点上沿特定方向上施加简谐力形成合成点源,分析和验证了单一纵波和横波有限元模型的稳定性及近似为平面波的监测距离。仿真结果表明:单一纵波位移场纵波相对幅值变化率在±1.5%范围内波动,相位变动幅度为±0.6°,近似单一横波位移场横波相对幅值变化率在±0.5%范围内波动,相位变动幅度为±20°;当监测距离大于10λ时,超声横波可近似认为是平面波;当监测距离大于5λ时,纵波可近似为平面波。单一纵波有限元模型显示出较好的稳定性。此模型的建立为单独分析单一模态对缺陷的散射特性、模态转换及高精度定量检测提供了支撑和依据。
英文摘要:
      It is very important to study the interaction of single mode defect in the analysis of scattering behavior of ultrasonic wave. By applying the harmonic forces in a particular direction to building resultant sources at multiple nodes, the single longitudinal wave mode and approximately single shear wave mode can be obtained, and the monitoring distance, where the longitudinal or shear wave could be approximately considered as a plane wave, and the stability of the corresponding finite element models have been analyzed. Simulation results show that the displacement fields exhibit the relative amplitude fluctuations of ±1.5% and phase fluctuations ±0.6° for the single longitudinal wave, and exhibit the relative amplitude fluctuations of ±0.5% and phase fluctuations within ±20° for the approximately single shear wave; when the monitoring distance is greater than 10λ the obtained shear wave could be approximately considered as a plane wave and the model shows good stability in performance; and when the monitoring distance is greater than 5λ the obtained longitudinal wave could be approximately considered as a plane wave. The established finite element models provide a basis and support for the separate analysis of a single mode on defect scattering characteristics, modal conversion and high accuracy quantitative detection.
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