V. Е. Gai - Ph.D. (Eng.), Associate Professor, Nizhniy Novgorod State Technical University n.a. R.E. Alekseev. E-mail: iamuser@inbox.ru <> D. Т. Ainullin - Nizhniy Novgorod State Technical University n.a. R.E. Alekseev. E-mail: xdamain@gmail.com