Baseline-free method for the evaluation of uniform corrosion based on ultrasonic guided waves

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (2) : 110-115.

ZHANG Yaoye，LI Dongsheng，ZHOU Zhi

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Abstract

Considering the influence of inherent uncertainties originated from the procedure of time-frequency analysis on the measurement accuracy,the residual diameter of a steel wire in accelerated corrosion experiment was evaluated with a baseline-free method of guided waves.Confirming the frequency region with high resolution in the uniform corrosion level,a binary explicit measuring function for approximately estimating the diameter was established according to the dispersive characteristics of ultrasonic guided waves,instead of repeatedly solving the Pochhammer equation in the successive analysis.The wavelet correlation analysis of the received signals was carried out,and a quantitative formula for the uncertainty based on the complex Morlet wavelet was specifically deduced.Comparing the results derived from the GUM and self-adaptive Monte Carlo method(MCM),it is proved that the GUM method can be used to evaluate the uniform corrosion of the component much more efficiently.

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structure health monitoring / dispersion / correlation analysis / Heisenberg’s uncertainty principle / GUM

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ZHANG Yaoye，LI Dongsheng，ZHOU Zhi. Baseline-free method for the evaluation of uniform corrosion based on ultrasonic guided waves[J]. Journal of Vibration and Shock, 2019, 38(2): 110-115

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