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- W2913243044 abstract "The equipment of oil refineries and other hazardous production facilities operate under high pressures and temperatures. Such operation conditions require continuous control and equipment remaining operation life period assessment. The existing methods of diagnostics are based on probabilistic remaining life assessment and use data regarding wall thickness variation during the operation process. The present article presents the method of accumulated damage assessment and its approximation to the limiting state, based on electromagnetic processes studying by means of eddy current control method. The main purpose of studies was determination of optimal value of input signal frequency, which could the most informative for determination of regularity of electric signal parameters change depending on the level of accumulated damages. Steel grade 09Г2С samples were used as the subject of studies. The samples were exposed to static tension under constant rate and during the process of samples deformation we measured the value of electric signal under three frequencies: 100 Hz, 10 kHz, and 1 MHz Based on the obtained results we prepared output signal voltage-relative elongation dependencies, which showed that accumulation of plastic deformations in metal leads to reduction of signal amplitude. Particularly interesting was dependence under 1 MHz frequency, under which electromagnetic processes occur in subsurface and surface layers. This dependence was of some regular nature, which was described by means of the sinusoidal function. Graph of the obtained function qualitatively describes the experimental dependence. On the basis of obtained results we can make a conclusion that optimal input signal frequency is within megahertz range, under which difference between the sinusoidal function graph and the empirical curve is minimum." @default.
- W2913243044 created "2019-02-21" @default.
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- W2913243044 date "2019-02-01" @default.
- W2913243044 modified "2023-09-25" @default.
- W2913243044 title "Influence of Alternating Current Frequency on Output Voltage at Electromagnetic Method of Metal Control" @default.
- W2913243044 cites W2322125880 @default.
- W2913243044 cites W2808514240 @default.
- W2913243044 doi "https://doi.org/10.4028/www.scientific.net/msf.945.879" @default.
- W2913243044 hasPublicationYear "2019" @default.
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