V.B. Bayburin1, V.V. Komarov2, V.P. Meshanov3, M.I. Balakin4, V.A. Kirkitsa5

1,2,4,5 Yuri Gagarin State Technical University of Saratov (Saratov, Russia)

3 NPP “Nika-SVCh” LLC (Saratov, Russia)