Nonlinear FEM-BEM formulation and model-free inversion procedure for reconstruction of cracks using pulse eddy currents

Author

Preda, Gabriel ; Cranganu-Cretu, Bogdan ; Hantila, Florea Ioan ; Mihalache, Ovidiu ; Chen, Zhenmao ; Miya, Kenzo

Author_Institution

Sch. of Eng., Univ. of Tokyo, Japan

Volume

38

Issue

2

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

1241

Lastpage

1244

Abstract

Pulse eddy currents are proposed as a nondestructive testing (NDT) technique to detect flaws in conductive structures with large thickness. The harmonic component of a pulse is rich, so that the pick-up signal containing the amount of information corresponds to a multifrequency analysis. Due to the short time length of the pulse, the amplitude of the excitation increases up to 100 times of the amplitude for an AC signal. Both direct simulation of pulse eddy-currents phenomena using an A-φ FEM-BEM code and neural network-based inversion techniques are performed. Numerical results for the inversion of signals due to outer defects are shown

Keywords

boundary-elements methods; crack detection; eddy current testing; engineering computing; finite element analysis; inspection; inverse problems; neural nets; sensitivity analysis; NDT technique; crack shape reconstruction; direct simulation; flaw detection; harmonic component; model-free inversion procedure; multifrequency analysis; neural network-based inversion techniques; nondestructive testing technique; nonlinear FEM-BEM formulation; pulse eddy currents; thick conductive structures; Aerospace industry; Eddy currents; Harmonic analysis; Inspection; Metals industry; Neural networks; Power generation; Power system harmonics; Signal analysis; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.996317

Filename

996317