Numerical simulations on electromagnetic NDT at high speed

Hall sensor array based validation of estimation of crack size in metals using magnetic dipole models

“…The Hall element sensors were arrayed in a 2-D plane with high spatial resolution that can detect cracks at high speed. Several theoretical analyses have also been conducted over the years such as finite element method (FEM) [12][13][14][15], analytical modeling of PEC based on time-harmonic problems [16,17], and extended truncated region eigenfunction expansion (ETREE) [18]. These methods produce results that are in have good agreement with the experimental results.…”

Fast analytical modelling for pulsed eddy current evaluation

“…The theoretical study for PEC has been conducted for several years and began with the analytical modelling for time-harmonic Eddy current inspection on layered structures [2], followed by numerical simulations using the finite element method (FEM) [3,4]. After the time-stepping solver was introduced in FEM, 2D and 3D FEM simulations are commonly used to PEC problems.…”

Measurement of the residual stress for the bogie frame of maglev vehicle based on barkhausen effect

“…In the process of magnetic domain wall displacement, it is necessary to overcome the potential energy barrier caused by uneven stress, impurities, holes and other factors inside the material. Therefore, the characteristics of the MBN signal can reflect the magnetic domain structure and motion law of the ferromagnetic material, which in turn reflects the microstructure and stress state of the material [6][7][8].…”