A.B. Lyukhter - Ph. D. (Eng.), Adviser, Voronezh State University E-mail: 3699137@mail.ru M.Yu. Zvyagin - Ph. D. (Phys.-Math.), Associate Professor, Voronezh State University E-mail: muz1953@yandex.ru A.S. Golubev - Ph. D. (Eng.), Associate Professor, Department «Physics and Applied Mathematics», Voronezh State University E-mail: andrey.golubev@vlsu.ru D.V. Rodionov - Post-graduate Student, Department «Physics and Applied Mathematics», Voronezh State University E-mail: d3391rod@gmail.com

I.K. Belova1, E.O. Deryugina2, A.V. Dyomin3

1-3 Kaluga Branch of Bauman Moscow State Technical University (Kaluga, Russia)

1 belova.ik@bmstu.ru, 2 deryugina_eo@bmstu.ru, 3 dyominav@student.bmstu.ru