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Hidden corrosion detection using laser ultrasonic guided waves with multi-frequency local wavenumber estimation
Tianfang Gao1, Hu Sun1, Yongqiang Hong1
1School of Aerospace Engineering, Xiamen University, Xiamen 361005, China.
Ultrasonics
|June 7, 2020
Summary
This study introduces a new method for detecting hidden corrosion in aircraft structures using multi-frequency local wavenumber estimation. The technique accurately quantifies corrosion depth with minimal error, enhancing flight safety and aircraft maintenance.
Area of Science:
- Materials Science
- Non-Destructive Testing
- Aerospace Engineering
Background:
- Hidden corrosion in aircraft structures poses significant risks to flight safety and complicates maintenance procedures.
- Existing corrosion detection methods often rely on local wavenumber estimation within a single mode and frequency, limiting accuracy.
- Quantitative assessment of hidden corrosion is crucial for effective aircraft structural health monitoring.
Purpose of the Study:
- To present a novel methodology for quantitative assessment of hidden corrosion in plates using multi-frequency local wavenumber estimation.
- To demonstrate the effectiveness of the proposed method through simulations and experimental validation.
- To improve the accuracy and reliability of hidden corrosion detection in aircraft structures.
Main Methods:
- Utilized a short-windowed Fourier transform in the space domain of the wavefield at single mode and multiple frequencies.
- Applied multi-frequency local wavenumber estimation for quantitative assessment of hidden corrosion.
- Developed a fully noncontact experimental platform for detecting hidden corrosion in aluminum plates.
Main Results:
- Simulations showed that optimal window size for accurate corrosion shape estimation is comparable to or less than half the corrosion length.
- Experimental validation on 1 mm thick aluminum plates with defined corrosion dimensions achieved relative errors not exceeding 6% for corrosion depth.
- The multi-frequency local wavenumber estimation method proved effective in quantitatively assessing hidden corrosion.
Conclusions:
- The developed multi-frequency local wavenumber estimation methodology offers a promising approach for accurate and quantitative detection of hidden corrosion.
- The noncontact experimental platform and validated methodology can significantly contribute to enhanced aircraft safety and maintenance.
- This technique provides a reliable tool for assessing the depth and shape of hidden corrosion, reducing potential flight risks.
