南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (2): 191–201.doi: 10.13232/j.cnki.jnju.2019.02.004

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Lamb波时间反转椭圆定位和层析成像混合技术研究

关立强1，祝伟光1，李义丰1,2*   

  1. 1.南京工业大学计算机科学与技术学院，南京，211800； 2．近代声学教育部重点实验室，南京大学声学研究所，南京，210093
  • 接受日期:2018-11-18 出版日期:2019-04-01 发布日期:2019-03-31
  • 通讯作者: 李义丰 E-mail:lyffz4637@163.com
  • 基金资助:
    国家自然科学基金(615741222)，江苏省六大人才高峰高层次人才项目

Research on hybrid techniques of Time－reversal Ellipse Location and Tomographic Imaging of Lamb wave

Guan Liqiang1，Zhu Weiguang1，Li Yifeng1,2*   

  1. 1.College of Computer Science and Technology，Nanjing Tech University，Nanjing，211800； 2. Key Laboratory of Modern Acoustics，MOE，Institute of Acoustics，Nanjing University，Nanjing，210093，China
  • Accepted:2018-11-18 Online:2019-04-01 Published:2019-03-31
  • Contact: Li Yifeng E-mail:lyffz4637@163.com

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摘要： 采用椭圆定位技术和层析成像技术相结合的无损检测方法，并将其运用于板状材料的Lamb波损伤检测和成像中. 与传统的单一层析成像技术相比，将椭圆定位技术和层析成像技术相结合，只需在椭圆定位技术确定的范围内选择有效的激励－传感路径进行层析成像，从而排除了多余的检测路径，可以减少数据计算和处理的数量，提高数据利用率和检测效率. 此外，由于事先用椭圆定位技术确定了损伤的范围，避免了额外激励－传感路径交叉点处损伤概率值较大的情况，这有效地减少了损伤检测误判情况的发生. 通过Abaqus有限元软件的仿真，选择合适的Lamb波激发频率和激发方式，然后布置恰当的传感器网络，结合椭圆定位技术和层析成像技术的概率损伤检测重构算法对损伤进行成像，这有效地提高了损伤的检测效率和成像质量，检测路径和成像计算时间节省率分别在47.6%和47.5%以上．

关键词: Lamb波, 时间反转, 椭圆定位, 概率损伤检测重构算法

Abstract: The non－destructive testing method combining ellipse location with tomography imaging techniques is adopted to Lamb wave damage detection and imaging of thin plate structures. Compared with the traditional single tomography technique，the combination of ellipse location and tomographic imaging techniques only require to select effective excitation－sense path for tomography in the range determined by the ellipse location，thereby the redundant paths are excluded. Thus the amount of data computing and processing can be reduced，which can improve the data utilization and detection efficiency. Besides，due to the method of determining the damage range via the ellipse positioning technique in advance，which avoids the appearance of large damage probability value at the intersection point of the additional excitation－sense path，the generation of detection error of damage is reduced effectively. The appropriate Lamb wave excitation frequency and excitation mode are selected in the simulations based on the finite element analysis software Abaqus，an advisable sensor network is arranged，and then the damage can be imaged and detected with the combination of elliptical positioning technique and reconstruction algorithm for probabilistic inspection of damage(RAPID). This testing method effectively improves the detection efficiency and the imaging quality of the damage，meanwhile the saving rates of detection path and imaging time are more than 47.6% and 40.7%，respectively.

Key words: Lamb wave, time reversal, ellipse location, RAPID

中图分类号: 

  • TH212，TH213.3
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