T.Yu. Pokrovskaya1, Sh.R. Yusupov2, M.K. Padenev3

1–3 Kazan National Research Technical University named after A. N. Tupolev (KNRTU-KAI) (Kazan, Russia)

1 vip89@mail.ru, 2 shamil_79@rambler.ru, 3 padenev2005@yandex.ru