V.B. Baiburin1, V.V. Komarov2, V.P. Meshchanov3, V.M. Doroshenko4

1,2,4 Yuri Gagarin State Technical University of Saratov (Saratov, Russia)
3 JSC «NPP «NIKA-SVCH» (Saratov, Russia)
1 baiburinvb@rambler.ru; 2 vyacheslav.komarov@gmail.com; 3 nika373@bk.ru, 4dorvalentina9@gmail.com