Newly re-designed magnetic head for wire rope NDT

The aim of the present paper is to analyse a newly re-designed magnetic head. Basic use of this head is in non-destructive testing (NDT) of wire ropes. The magnetic head system is composed of two main areas and three main parts. These areas are: magnetic flux leakage area in central region, and eddy current magnetic field area in outer side region of magnetic head. The analyses were carried out by analytic approach and by the finite element method. The value of induced voltage in flux leakage pick-up coils was calculated by axisymmetric 2D magnetostatic finite element analysis made by ferromagnetic rod to simulate the wire rope. Meanwhile, voltage induced by changes in eddy current magnetic field was calculated by a 2D transient linear motion finite element analysis. All numerically calculated results were compared with the measured ones on a geometrically similar ferromagnetic rod. Also, we have presented the measured results carried out by newly re-designed magnetic head on real steel wire rope with anomalies.