IEEE Transactions on Magnetics · 2002 · 42 citations · 6 references
ComputingComputational EngineeringElectrical EngineeringComputational ElectromagneticsFinite Element AnalysisFinite Element MethodsCrack AssessmentDigital Signal ProcessingElectromagnetic Inverse ProblemsElectromagnetic MethodsMagnetic CharacterizationMagnetic Circuit AnalysisCracksDeterministic Inverse AnalysisDeterministic Inverse ProblemsDeterministic OptimizationElectromagnetic Field SolverFinite Element Magnetic AnalysisMagnetic FluxPolarization
In this paper, the reconstruction of crack shapes from 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 the A 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 cracks 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.
6
Alternative magnetic flux leakage modalities for pipeline inspection
G. Katragadda, W. Lord, Yuzhi Sun et al. · IEEE Transactions on Magnetics · 1996 · 32 citations