A model of crack was developed to provide possibility for magnetic field over the defect, and signal that will be inducted in the searching coil depending on its parameters, spatial orientation and height above rail head to be calculated. This allows to analyze the shape of the signals and the ratios between their amplitudes for all three components of the magnetic field caused by crack depending on its shape and location in the rail and to predict signals in multichannel systems of rail flaw detection.
MATHEMATICAL MODEL FOR DETERMINING RAILROAD RAIL CRACKS IN MAGNETIC FLAW DETECTION
A crack model was developed, for which the magnetic field over the defect (crack) was determined, as well as the signal obtained in the measuring search coil depending on its parameters, spatial orientation, and height above the rail head.
This allows for the analysis of signal waveforms and the correlations between their amplitudes for all three components of the crack’s magnetic field depending on its shape and distribution in the rail head, as well as for predicting signals in multichannel rail flaw detection systems.
1. INTRODUCTION
Diagnosis of technical condition of facilities ensures their safe operation and timely detection of defects. This is especially true in the diagnosis of objects, whose defects can cause considerable material losses or casualties. These objects include railroad rails. Timely detection of defective rails can take measures to prevent rail break under the train, which increases safety and economic efficiency of rail transport in general. (…)
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