超声导波目标模式的激励方法研究

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摘要超声导波检测过程中不同模态导波信号与各类损伤之间的相互作用存在差异性，直接影响了损伤检测及定位成像结果的可靠性。因此，系统研究导波目标模式的激励方法从而获得理想的导波信号，有助于实现多类型损伤的精准检出以及获得高分辨率定位成像结果。本文基于理论分析、有限元仿真和实验测量开展了超声导波目标模式的激励方法研究。理论分析导波目标模式激励的条件，并且构建二维多物理场仿真模型进行导波目标模式激励方法的验证。实验过程中将梳状换能器与PZT压电片进行比较分析，结果表明，梳状换能器相较于PZT压电片具有良好的模式选择能力。另外，设计制作四分之一全向和全向梳状换能器，使其进行目标模式导波信号激励的同时实现传播方向的调控。

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	丁涛涛1
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	郭宇1
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	项延训3

关键词 ：超声导波, 目标模式, 梳状换能器, 声场调控

Abstract：In the process of ultrasonic guided waves detection, the interaction between different modes of guided waves and various types of damage is different, which directly affects the reliability of damage detection and localization imaging. Therefore, the excitation method of target mode of guided waves is systematically studied to obtain the ideal guided waves, which is helpful to realize the accurate detection of multi-types damage and obtain high resolution positioning imaging. In this paper, the excitation method of target mode of guided waves is studied in theoretical analysis, finite element simulation and experimental measurement. The excitation condition of target mode of guided waves is analyzed theoretically, and two-dimensional multi-physical field simulation models are constructed to verify the method. The comb transducer and PZT wafer were compared during the experiment of guided waves. The results show that the comb transducer has better mode selection ability than PZT wafer. In addition, the quarter omnidirectional and omnidirectional comb transducers are designed to excite the target mode and control the propagation direction of guided waves.

Key words： ultrasonic guided waves target mode comb transducer sound field control

收稿日期: 2023-02-08 出版日期: 2024-02-28

引用本文:

丁涛涛1,2,3，郭宇1,2，项延训3. 超声导波目标模式的激励方法研究[J]. 振动与冲击, 2024, 43(4): 20-26.
DING Taotao1,2,3，GUO Yu1,2，XIANG Yanxun3. A studyon an excitation method of the target mode of ultrasonic guided waves. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(4): 20-26.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I4/20

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