Перегляд за автором "Meshkov, S. M."

Зараз показано 1 - 3 з 3
  • Зображення мініатюри
    Публікація
    Detection of "Wall Thinning" Type Defects in Pipelines by Thermal Method
    (Eskisehir Technical University, 2019) Orel, R. P.; Meshkov, S. M.; Storozhenko, V. O.; Myagkiy, O. V.
    A thermophysical model of a pipe with a local defect of the “wall thinning” type is developed. Calculations of thermal anomalies for pipelines with different parameters of hidden defects are performed, illustrating the possibility of using the thermal method of nondestructive testing. The conditions and methods of thermal control of individual sections of pipelines are specified. Thermal imaging examination of steam pipelines of the main condensate of the nuclear power plant was carried out. External factors that make it difficult to detect hidden defects (the influence of external lighting, cylindrical shape of controlled objects, powerful external heat sources) are analyzed. It was found that cavitation phenomena significantly increase the temperature drop in the locations of local defects. The possibility of using the thermal method of nondestructive testing for rapid detection of hidden defects such as “wall thinning” in the pipelines of the main condensate has been confirmed experimentally.
  • Зображення мініатюри
    Публікація
    Reducing the level of interference at thermal non-destructive testing considering the specific thermal physical and morphological characteristics of the object
    (2022) Storozhenko, V. O.; Meshkov, S. M.; Orel, R. P.; Miahkyi, O. V.
    Interferences, characteristic for non-destructive thermal testing which reduce the reliability of the results obtained are described. A technique for their reduction is suggested which consists of two interrelated stages. The fi rst stage consists in calculating and analyzing the nature and level of the expected signal according to the developed thermophysical model against the background of the experimentally obtained noise level. According to the results of analysis of calculations using the thermophysical model for the selected samples, the most infl uential interference was the inhomogeneity of the emissivity of the sample surface. The second stage of processing the received data is devoted to reducing this noise. This stage consists in processing of thermograms of temperature fi elds and includes morphological analysis of the surface condition, fi ltering and reducing characteristic noise and interference. It consists of four practical procedures: analysis of the visual image and obtaining a map of zones with diff erent emissivity of the sample surface, analysis of the thermogram with an assessment of the level of discreteness of the thermogram and the position of fi ducial points on the image, smoothing the thermographic image and highlighting zones on the thermogram with diff erent emissivity of the controlled object surface, after which the noise is fi ltered. Since the results of thermal control are strongly infl uenced by the shape of the object, the possibilities and eff ectiveness of the suggested technique are illustrated on a cylindrical object. It has been experimentally confi rmed that for the selected sample, it was possible to reduce the noise level to that of confi dent separation of useful signal against the noise background.
  • Зображення мініатюри
    Публікація
    Thermal Control for Metal Condition Testing in Pipelines of Nucltar Power Plant
    (2017) Meshkov, S. M.; Orel, R. P.
    The thermographic examination results of nuclear power plant high pressure pipelines and main condensate pipelines are considered. The conditions and technique of several sections thermal control are specified. It is found, that cavitation defects have a "heat trace". The use of thermography as an effective express-control method for quick determining the temperature anomalies space for a detailed study of other methods is proposed