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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 Physical principles of non-contact ultrasonic frequency sensors creation for the study of nanocrystalline ferromagnetic materials(Сумський державний університет, 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.