Probability of detection of cracks in metal structures using guided wave based on a signal response analysis model

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (2) : 32-41.

WANG Li1,2，YANG Yu2，LIU Guoqiang2，WANG Xiaguang2，LI Jiaxin2，REN Yipeng2

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Abstract

In order to realize the condition-based maintenance and formulate the inspection and maintenance scheme during the service, probability of detection (POD) for guided wave damage monitoring technology must be clarified, as a new nondestructive testing method. This paper presents a novel POD computation method for guided wave based on signal response analysis model. First, the statistical computation model of POD is obtained by establishing the mapping relationship between the damage features of online response guided waves and fatigue crack. Then, by analyzing the quantitative effect of uncertainties of fitting parameters on the statistical computation model, POD computation models under different confident levels are obtained. The proposed method is validated on fatigue cracks monitoring experiments on metal center-hole and lap specimens. The results show that damage features, fitting functions and transducers monitoring schemes all have effects on POD, and the detectable crack length under 95% confidence level and 90% detection probability for center-hole and lap metal structures are about 2.6 mm and 9.5 mm.

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structural health monitoring / guided waves / probability of detection(POD) / metal / fatigue crack

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WANG Li1,2，YANG Yu2，LIU Guoqiang2，WANG Xiaguang2，LI Jiaxin2，REN Yipeng2. Probability of detection of cracks in metal structures using guided wave based on a signal response analysis model[J]. Journal of Vibration and Shock, 2024, 43(2): 32-41

References

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