A studyon an excitation method of the target mode of ultrasonic guided waves

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (4) : 20-26.

DING Taotao1,2,3，GUO Yu1,2，XIANG Yanxun3

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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

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DING Taotao1,2,3，GUO Yu1,2，XIANG Yanxun3. A studyon an excitation method of the target mode of ultrasonic guided waves[J]. Journal of Vibration and Shock, 2024, 43(4): 20-26

References

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