N.S. Kulagina - Student, Kaluga branch, Bauman MSTU E-mail: kulagina.natalia2013@yandex.ru S.A. Adarchin - Ph.D. (Eng.), Associate Professor, Kaluga branch, Bauman MSTU E-mail: adarchin@rambler.ru V.G. Kosushkin - Dr.Sc. (Eng.), Professor, Kaluga branch, Bauman MSTU E-mail: kosushkin@gmail.com