Title :
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
fDate :
3/1/2002 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
