A.V. Skiper - Senior Lecturer, Kaluga branch of the Bauman MSTU. E-mail: skiper60@yandex.ru N.S. Lazarev - Student, Kaluga branch of the Bauman MSTU. E-mail: lazarevnikolay05@gmail.com V.S. Zaionchkovskiy - Ph. D. (Phys.-Math.), Associate Professor, Kaluga branch of the Bauman MSTU. E-mail: vz48@post.ru I.A. Rastorguyev - Student, Kaluga branch of the Bauman MSTU. E-mail: rastorguew94@gmail.com