ΠΠ΅ΡΠ΅Π³Π»ΡΠ΄ Π·Π° ΠΠ²ΡΠΎΡ "Plesnetsov, S. Yu."
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Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡΠ² Π½Π° ΡΡΠΎΡΡΠ½ΡΡ
ΠΠ°Π»Π°ΡΡΡΠ²Π°Π½Π½Ρ ΡΠΎΡΡΡΠ²Π°Π½Π½Ρ
ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Electromagnetic-acoustic method of ultrasonic pulse excitation and reception in metal products(Π₯Π°ΡΠΊΡΠ²ΡΡΠΊΠΈΠΉ Π½Π°ΡΡΠΎΠ½Π°Π»ΡΠ½ΠΈΠΉ ΡΠ½ΡΠ²Π΅ΡΡΠΈΡΠ΅Ρ ΡΠΌΠ΅Π½Ρ Π. Π. ΠΠ°ΡΠ°Π·ΡΠ½Π°, 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.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Mathematical Modeling of Physical Processes of Electromagnetic Field Transformation in Elastic Oscillations Field in Microthick Layers of Metals(Π‘ΡΠΌΡΡΠΊΠΈΠΉ Π΄Π΅ΡΠΆΠ°Π²Π½ΠΈΠΉ ΡΠ½ΡΠ²Π΅ΡΡΠΈΡΠ΅Ρ, 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.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Physical principles of non-contact ultrasonic frequency sensors creation for the study of nanocrystalline ferromagnetic materials(Π‘ΡΠΌΡΡΠΊΠΈΠΉ Π΄Π΅ΡΠΆΠ°Π²Π½ΠΈΠΉ ΡΠ½ΡΠ²Π΅ΡΡΠΈΡΠ΅Ρ, 2018) Plesnetsov, S. Yu.; Mygushchenko, R. P.; Petryschev, O. N.; Suchkov, G. M.; Khrypunova, A. L.A mathematical model is developed to determine the force impacts that are formed when the electro-magnetic field is transformed into a field of ultrasonic oscillations in the skin layer of an electrically conductive ferromagnetic material of an anisotropic magnetic permeability. The main factors determining the excited acoustic field with allowance for permissible limitations are established. It is shown that the main contribution to the acoustic vibrations energetics is made by the magnetostrictive component of the skin layer material, in which the high-frequency electromagnetic field is transformed into an acoustic field.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Powerful sources of pulse high-frequency electromechanical transducers for measurement, testing and diagnostics(ΠΠ’Π£ "Π₯ΠΠ", 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.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Simulation of Electromagnetic Conversion Process Under Torsion Waves Excitation(ΠΠ½ΡΡΠΈΡΡΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ΄ΠΈΠ½Π°ΠΌΡΠΊΠΈ ΠΠΠ Π£ΠΊΡΠ°ΡΠ½ΠΈ, 2018) Plesnetsov, S. Yu.; Petrishchev, O. N.; Mygushchenko, R. P.; Suchkov, G. M.Mathematical simulation and calculation of electromagnetic fields in the electromagnetic-acoustic transducer of rational design are performed under non-dispersive torsional waves excitation in tubular electrically conductive ferromagnetic hollow rods of small diameter, taking into account spatial, frequency, energy and material factors. The results of the research can be used to simulate and construct exciting EMATs for measuring, monitoring, and diagnostic equipment in the energy, nuclear, chemical and other industries in view of ultrasonic studies of ferromagnetic tubular products.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Simulation of Electromagnetic Conversion Process Under Torsion Waves Excitation(ΠΠ½ΡΡΠΈΡΡΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ΄ΠΈΠ½Π°ΠΌΡΠΊΠΈ ΠΠΠ Π£ΠΊΡΠ°ΡΠ½ΠΈ, 2018) Plesnetsov, S. Yu.; Petrishchev, O. N.; Mygushchenko, R. P.; Suchkov, G. M.Mathematical modeling of the electromagnetic-acoustic transducer (EMAT) for excitation of nondispersive torsional waves in tubular electrically conductive ferromagnetic hollow rods of small diameter is performed taking into account all the factors that determine the design of the EMAT. The solutions of the differential equation for the values of the electromagnetic fields formed by the high-frequency coil of the device in the gap between the transducer and the tubular ferromagnetic product are found. The results of the research can be used to simulate and design exciting EMATs for measuring, monitoring, and diagnostics in the energy, nuclear, chemical and other industries for ultrasonic test of ferromagnetic tubular products.ΠΠΎΠΊΡΠΌΠ΅Π½Ρ Πlectromagnetic-acoustic transducers for ultrasonic measurements, control and diagnostic of metal products(ΠΠ°ΡΡΠΎΠ½Π°Π»ΡΠ½ΠΈΠΉ Π½Π°ΡΠΊΠΎΠ²ΠΈΠΉ ΡΠ΅Π½ΡΡ "ΠΠ½ΡΡΠΈΡΡΡ ΠΌΠ΅ΡΡΠΎΠ»ΠΎΠ³ΡΡ", 2019) Salam, Bussi; Suchkov, G. M.; Mygushchenko, R. P.; Kropachek, O. Yu.; Plesnetsov, S. Yu.An effective type of ultrasonic method is the electromagnetic-acoustic method, especially in determining the quality of ferromagnetic products. The main factor determining the efficiency of using electromagnetic-acoustic transducers is the magnitude of the induction of a polarizing magnetic field, which is determined by the source. The studies carried out in the framework of this activity were aimed at solving the problems of high-quality measuring testing of metal products from ferromagnetic materials by electromagnetic-acoustic transducers. The requirements are formulated for a pulsed source of a polarizing magnetic field, inductors, and core as part of electromagnetic-acoustic transducers. Taking into account the requirements, structural solutions have been proposed for constructing electromagnetic-acoustic transducers with a flat two-window inductor and a flat high-frequency inductor. Experimental studies aimed at improving ultrasonic electromagnetic-acoustic transducers with pulsed magnetic field sources have been performed. The possibility of providing the sensitivity of new transducers with thickness measurement, measuring control and diagnostics is shown. Technical solutions are proposed that reduce the effect on ultrasonic pulses of the received Barkhausen noise and coherent interference from the magnetostrictive conversion of electromagnetic energy into ultrasonic. The efficiency of using electromagnetic-acoustic transducers with a pulsed polarizing magnetic field is shown for measuring quality control of ferromagnetic products made by rolling, stamping and the like.