Abstract
A generalized model for finding magnetic field and signals from the objects of the railroad is proposed. A 3D model of the primary field of a defect-free rail excited by a pilot alternating current is developed. The mathematical models of the secondary field of the rail disturbed around a transverse wedge-shaped crack and a rectangular crack are developed. We compare the images of signals from a transverse wedge-shaped defect obtained in the course of modeling with actual defects, such as, e.g., transverse cracks.
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