Localization of a Crack in Moving Cylindrical Ferromagnetic Rods by Measuring the Fourier Coefficients of the Leakage Magnetic Flux

This article presents a novel leakage magnetic flux (LMF) method to estimate crack positions in moving cylindrical ferromagnetic rods. The crack positions are estimated by the circumferential first-order Fourier coefficients of the LMF by utilizing the dc excitation and modeling the moving crack as...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2024-09, Vol.60 (9), p.1-5
Main Authors: Shiku, Kanta, Kuromizu, Masafumi, Gotoh, Yuji, Nara, Takaaki
Format: Article
Language:English
Subjects:
Coils
Geometry
Inverse problems
leakage magnetic flux (LMF)
magnetic dipole
Magnetic domains
Nondestructive testing
Permanent magnets
Position measurement
Sensor arrays
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Summary:This article presents a novel leakage magnetic flux (LMF) method to estimate crack positions in moving cylindrical ferromagnetic rods. The crack positions are estimated by the circumferential first-order Fourier coefficients of the LMF by utilizing the dc excitation and modeling the moving crack as a magnetic dipole. The Fourier coefficients are directly measured by using only two coils. In addition, numerical experiments were conducted to evaluate the effect of motion-induced eddy current (MIEC). The demonstration of locating hole-shaped cracks in moving S45C cylindrical rods was performed by using the proposed method.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2024.3418464