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A goal function scan based on an extended area approach is applied to determine size and depth of a defect in Lorentz force evaluation (LFE). Four datasets of a laminated aluminium specimen with a cylindrical defect at depths of 2, 4, 8 and 14 mm are simulated with the finite element method. LFE yields the correct defect sizes and depths for all four defects with a root mean square error of 0.95,...
In Lorentz force evaluation the model of the permanent magnet influences the accuracy of the forward solution. We assess the forward solution by modelling the permanent magnet with a varying number of magnetic dipoles. Our model comparison shows that a model with 10 dipoles is well suited for the forward calculation of Lorentz forces.
We propose a new method for contactless, nondestructive evaluation of moving laminated conductors, the so-called Lorentz force evaluation (LFE). The Lorentz force (LF) exerting on a permanent magnet moving relative to the specimen is measured. We propose a novel fast forward calculation of the LF based on a three-dimensional finite volume discretization of the specimen and an approximation of defects...
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