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Boundary Element Calculation of Eddy Currents in Cylindrical Structures Containing Cracks.
- Source :
-
IEEE Transactions on Magnetics . Mar2009, Vol. 45 Issue 3, p1012-1015. 4p. 5 Graphs. - Publication Year :
- 2009
-
Abstract
- Electromagnetic fields due to excitation coils in boreholes containing cracks have been calculated using a boundary element method formulated in terms of a scalar decomposition of the field. By using a Green's kernel that ensures continuity of the tangential electric and magnetic field at the cylindrical surface, it is only necessary to render the flaw region in a discrete form. The effect of an ideal crack, one with zero opening but acting as a perfect barrier to eddy currents, is here represented by a current dipole layer orientated normal to the crack surface. An integral equation determines the source density on the crack and a numerical solution is found using boundary elements. The coil impedance change due to the crack is then computed using an expression based on a reciprocity principle. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00189464
- Volume :
- 45
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Magnetics
- Publication Type :
- Academic Journal
- Accession number :
- 37212399
- Full Text :
- https://doi.org/10.1109/TMAG.2009.2012543