Ioan Florea Hantila, Cleante Petre Mihai, Costin Ifrim and Teodor Leuca
This paper presents an efficient procedure for reconstructing the aged region of ferromagnetic material.
Abstract
Purpose
This paper presents an efficient procedure for reconstructing the aged region of ferromagnetic material.
Design/methodology/approach
The aging of the ferromagnetic material leads to changes of B ‐H relationship. This property may be used for detection of the degraded parts of ferromagnetic pieces. In numerical procedures the region with a possible aged zone is described by a finite number of subdomains where the flaw vector is defined with binary entries.
Findings
Because of the small B ‐H changes, the magnetic field modifications linearly depend (matrix T) by the flaw vectors. Using a double Gauss pivotation scheme, an enough well conditioned and invertible submatrix is extracted from the matrix T. The unknowns associated with this submatrix (called main unknowns) can be easily obtained by a linear relationship from the rest of the unknowns (called minor). In the set of the minor unknowns we search for that vector which gives the smallest error of the principal unknowns in comparison with the values 0 or 1.
Originality/value
This procedure leads to a spectacular increasing of the efficiency in comparison with the known procedures.