V.E. Chumakov1, A.M. Pilipenko2, D.V. Kleimenkin3, V.N. Biryukov4

1,3 Don State Technical University (Rostov-on-Don, Russia)

2,4 Southern Federal University (Taganrog, Russia)

1 chumakov.dssa@mail.ru; 2 pilipenko-am@mail.ru; 3 K-Dima-01@mail.ru; 4 vnbiryukov@yandex.ru