E.A. Emelianov - Post-graduate Student, Yuri Gagarin State Technical University (Saratov) A.A. Zaharov - Dr. Sc. (Eng.), Professor, Head of Department, Yuri Gagarin State Technical University (Saratov)

A.A. Shvachko1, A.A. Potapov2, Z.N. Jihad3

1-3 Yuri Gagarin State Technical University of Saratov, (Saratov, Russia)