Guided wave delay-and-sum iamging  damage imaging based on wave velocity interval

LIU Guoqiang, WANG Li, WANG Xiaguang, LI Wei, LIU Gang

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 232-236.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 232-236.

Guided wave delay-and-sum iamging  damage imaging based on wave velocity interval

  • LIU Guoqiang, WANG Li, WANG Xiaguang, LI Wei, LIU Gang
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Abstract

The delay-and-sum imaging algorithm is a classic damage imaging method for the guided wave-based damage monitoring. Its performance is very dependent on the accurate guide wave velocity. However, the accurate guide wave velocity in complex engineering structure is often difficult to obtain. Thus for the complex engineering structure, the effectiveness of the algorithm could be affected. In order to solve the abovementioned problem, a delay-and-sum iamging algorithm based the range of wave velocity is proposed. In the proposed algorithm, the part of damage scattered signal of guided wave is delayed by the range of wave velocity. Then the maximum value of the delayed signal is summed as the damage imaging value.The validity of the proposed algorithm is assessed by identifying damages at different locations on a stiffened composite panel. The results show that the proposed algorithm can identify damage accurately and its robustness is better than the delay-and-sum imaging algorithm.

Key words

guided waves / damage imaging / composite / structural health monitoring / delay-and-sum

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LIU Guoqiang, WANG Li, WANG Xiaguang, LI Wei, LIU Gang. Guided wave delay-and-sum iamging  damage imaging based on wave velocity interval[J]. Journal of Vibration and Shock, 2024, 43(17): 232-236

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