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Reconstruction of Crack Shapes From the MFLT Signals by Using a Rapid Forward Solver and an Optimization Approach

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Zhenmao Chen, Gabriel Preda, Ovidiu Mihalache, and Kenzo Miya

Editorial: IEEE Transaction on Magnetics, 38, p.1025-1028, 2002.


In this paper, the reconstruction of crack shapes from the magnetic flux leakage testing (MFLT) signals is realized by introducing a rapid forward simulator and applying a deterministic
optimization approach. The MFLT signals due to cracks of different shape are calculated with an FEM-BEM code employing method and polarization algorithm, which is accelerated by the
new rapid forward scheme. For reconstructing the crack shape, the
conjugate gradient method is applied with the gradients predicted by using the difference technique. Both inner and outer crack are successfully reconstructed from simulated MFLT signals that verified both the efficiency of the fast-forward scheme and the feasibility of the deterministic inverse approach.

Cuvinte cheie: ECT, NDT, Database approach