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- W2124173863 abstract "This paper presents a fatigue crack detection technique based on visualization of nonlinear ultrasonic wave modulation produced by a fatigue crack. When distinctive low frequency (LF) and high frequency (HF) inputs are generated and applied to a structure, the presence of a fatigue crack can provide a mechanism for nonlinear ultrasonic modulation and create spectral sidebands around the frequency of the HF signal. In this study, the two input signals are created by two air-coupled transducers (ACT), and the corresponding ultrasonic responses are scanned over a target specimen using a 3D laser Doppler vibrometer (LDV). The crack-induced spectral sidebands are isolated using a combination of linear response subtraction (LRS), and continuous wavelet transform (CWT) filtering. Then, the extracted spectral sideband components are visualized near the fatigue crack. The effectiveness of the proposed non-contact scanning technique is tested using an aluminum plate with a real fatigue crack." @default.
- W2124173863 created "2016-06-24" @default.
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- W2124173863 date "2014-03-08" @default.
- W2124173863 modified "2023-10-17" @default.
- W2124173863 title "Non-contact visualization of nonlinear ultrasonic modulation for reference-free fatigue crack detection" @default.
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- W2124173863 doi "https://doi.org/10.1117/12.2046182" @default.
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