Vitalij Nichoga

3D-modeling of rail pair magnetic field

Some results of modeling of the magnetic fields induced by automatic locomotive signaling, taking into account the influence of the ground and the locomotive, are presented. The possibility of usage of corresponding signals for technical diagnostics of the rail state is considered.

Alternating magnetic fields as an instrument for technical diagnostics of the rail damages

Electromagnetic methods, which are based on determination of the characteristics of the electromagnetic fields radiated by inspected objects when alternating electrical currents flow in them, are widely used in engineering practice.

Integration of passive coherent radar system into the passive TDOA system

One of the ways of passive coherent radar system integration into the passive TDOA system is considered. Generalized algorithm of the objects location estimation on their radiation of the onboard radio technical systems and in the field of highlighting by the different purposes ground based transmitters with a priory known and unknown coordinates is shown.

Radiations from a portable terminal

The paper shows wide range of radiations from handy-talkie type devices. The complex exposure of an operator should be taken into account in biomedical studies, while only role of a carrier wave is investigated.

Wavelet-neural network for detection signals from transverse cracks in the rail head

In this paper, the implementation of artificial neural network (ANN) for detection signals from transverse cracks in the rails is presented. As input parameters, this network uses the coefficients of continuous wavelet transform (CWT), which are obtained from the analysis of signals recorded during the magnetodynamic flaw detection of rails.

Continuous wavelet transform of railway track defectoscopic signals in the MATLAB wavelet toolbox

rail networks across the world are getting busier with trains travelling at higher speeds and carrying more passengers and heavier axle loads than ever before. The combination of these factors has put considerable pressure on the existing infrastructure, leading to increased demands in inspection and maintenance of rail assets [1]. Nowadays, rails are systematically inspected for internal and surface defects using various non-destructive evaluation (NDE) techniques, the most common of which are ultrasonic and magnetic flux leakage (mFl) methods. The article is focused on the analysis of defectoscopic signals received using the magnetic wagon-defectoscope of lviv railway (mFl method) by the continuous wavelet transform (cWt).

Peculiarities of European Union Countries and Ukraine Approach to Estimation of Technogenic Electromagnetic Fields Influence on Bioecosystems

Characteristics of European union and Ukraine standards concerning acceptable limits of technogenic electromagnetic field strength for protection of workers and population are presented in the report.

Computer and measurement determination of the electromagnetic field parameters. theory and practice

Some peculiarities of determination of the electrical E and magnetic H components of field strength near the field source (in the near zone) are considered in the report. It is shown that in such cases calculation methods do not take into account many factors that can essentially distort the calculation results.