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Документ Electromagnetic-acoustic method of ultrasonic pulse excitation and reception in metal products(Харківський національний університет імені В. Н. Каразіна, 2017) Plesnetsov, S. Yu.; Suchkov, G. M.The problem of the main factors infl uence on the electro-magnetic energy to ultrasound conversion in test-ing of electrically conductive or ferromagnetic materials is considered. The necessity to provide the polarizing magnetic fi eld induction maximum value and the maximum current in the electromagnetic-acoustic transducer high-frequency coil is shown. A converter for co-radiation and reception of pulses of ultrasonic vibrations has been developed and tested, providing useful information signal amplitude of up to 50 dB.Документ Mathematical Modeling of Physical Processes of Electromagnetic Field Transformation in Elastic Oscillations Field in Microthick Layers of Metals(Сумський державний університет, 2017) Plesnetsov, S. Yu.; Migushchenko, R. P.; Petryschev, O. N.; Suchkov, G. M.; Khrypunov, G. S.The results of the mathematical studies on the modeling of high-frequency electromagnetic field conversion in the field of elastic oscillations process in microthick surface layers or electrically conductive ferromagnetic material thin films placed in a magnetic field are given, taking into account the coherence of elastic, electric and magnetic properties of the metal. It is shown that in practical calculations, especially in the case of high-frequency oscillations, it is necessary to take into account thickness of skin layer in which electromagnetic field transforms into acoustic field.Документ Powerful sources of pulse high-frequency electromechanical transducers for measurement, testing and diagnostics(НТУ "ХПИ", 2018) Plesnetsov, S. Yu.; Petrishchev, O. N.; Mygushchenko, R. P.; Suchkov, G. M.; Sotnik, S. V.; Kropachek, O. Yu.Development of powerful current radio pulses generators (CRPG) for powering high-frequency electromechanical transducers based on IGBT transistors. To carry out the research, the statements of the magnetic and electromagnetic fields interaction with electric and ferromagnetic material, electric circuits, structure of radio electronic devices theory were used. The main provisions for creating powerful broadband generators for powering electromechanical transducers based on IGBT transistors are determined. It is shown that the generators intended for use in measurements, testing and diagnostics should provide adjustment of the frequency and duration of the output current pulses, and also provide current in the transducer inductor of several hundred amperes. The connection between the power frequency of the resonant electromechanical transducer and the gap between the transducer and the surface of the metal being diagnosed is established. A CRPG variant for powering electromechanical transducers in the frequency range 1 ... 3 MHz and the duration of current pulses of 1 ... 20 periods of the filling frequency is developed and manufactured. The peak current in the inductor of a high-frequency electromechanical transducer has reached 450 A. For the first time, the possibility of using powerful IGBT transistorsin electronic devices working in a key mode in push-pull circuits for feeding high-frequency electromechanical transducers is shown. Using the resultsobtained will allow the creation of new instruments for measurement, control and diagnostics with wider characteristics.