Semi-analytical computation of a quasi-static field induced by a 3D eddy current probe in anisotropic material with rough interfaces

2021 ◽  
pp. 1-1
Author(s):  
Houssem Chebbi ◽  
Denis Premel
Keyword(s):  
Eddy Current ◽  
Anisotropic Material ◽  
Static Field ◽  
Analytical Computation ◽  
Rough Interfaces

scholarly journals Eddy current in a rotating cylinder in a static field by a stochastic method

2012 ◽  
Vol 57 (3) ◽  
pp. 30901
Author(s):  
J. Lévêque ◽  
T. Lubin ◽  
S. Mezani ◽  
A. Rezzoug
Keyword(s):  
Eddy Current ◽  
Rotating Cylinder ◽  
Static Field ◽  
Stochastic Method

Self-correction of proton spectroscopic images for gradient eddy current distortions and static field inhomogeneities

1993 ◽  
Vol 30 (2) ◽  
pp. 255-261 ◽  
Author(s):  
G. Johnson ◽  
K. J. Jung ◽  
E. X. Wu ◽  
S. K. Hilal
Keyword(s):  
Eddy Current ◽  
Static Field

scholarly journals The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach

2020 ◽  
Vol 89 (1) ◽  
pp. 10901
Author(s):  
Houssem Chebbi ◽  
Denis Prémel
Keyword(s):  
Eddy Current ◽  
Simulated Data ◽  
Multilayered Structure ◽  
Static Field ◽  
Fast Computation ◽  
Destructive Testing ◽  
Modal Approach ◽  
High Anisotropy ◽  
Non Destructive

Due to the excessive use of composites in the industrial field, many numerical modeling approaches dedicated to the characterization of such complex material by means of Non Destructive Testing Techniques were developed. In this paper, we present a numerical model dedicated to simulate the inspection of unidirectional Carbon Fiber Reinforced Polymer using Eddy Current technique for detecting fiber disorientation. A semi-analytical model based on a modal approach is developed for the fast computation of quasi-static field induced by an arbitrary 3D Eddy Current probe in the material. Because of the high anisotropy and strong heterogeneity of such material, a prior phase of homogenization is assumed and the material is then considered as homogeneously anisotropic. The modal approach consists in resolving Maxwell’s equations in the Fourier domain. Therefore, the electromagnetic field is expressed as a sum of eigen-modes. To take into account the wave propagation through the multilayered structure and boundary conditions at each separating interface, a stable and recursive scattering matrix algorithm has been implemented. The impedance of the probe is computed analytically using Auld’s formula in orders to identify the main orientation of the fibers in the inspected zone. For numerical validation, simulated data provided by the model are compared to finite element data.

Performance prediction and analysis of disk-type eddy-current drivers

2017 ◽  
Vol 40 (5) ◽  
pp. 1568-1578 ◽  
Author(s):  
Zhao Li ◽  
Dazhi Wang ◽  
Tongyu Shi ◽  
Xue Bai
Keyword(s):  
Eddy Current ◽  
Performance Prediction ◽  
Permanent Magnets ◽  
Eddy Currents ◽  
Three Dimensional ◽  
Prediction Method ◽  
Maximum Error ◽  
Static Field ◽  
Average Error ◽  
Three Dimensional Finite Element

For the disk-type eddy-current drivers, an accurate and simple performance prediction method is developed. The static field produced by the permanent magnets and induction field by eddy currents are calculated using magnetic equivalent circuit method, and Faraday’s and Ampere’s law, respectively. In this model, many factors, such as the saturation effect of ferromagnetic materials, working temperature and the electromagnetic effects of back iron are taken into consideration. Compared with other methods, the model has a good agreement with three-dimensional finite-element method, and the average error is 4.9%. Finally, a prototype and corresponding test platform are made. Test results show that the proposed method is effective, and the maximum error is less than 8%. Besides, it is confirmed that eddy-current drivers can tolerate shaft misalignment and be used as speeders.

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