V.R. Krasheninnikov - Dr. Sci. (Eng.), professor, Ulyanovsk State Technical University. E-mail: kvr@ulstu.ru
A.S. Kopylova - Ph.D. (Eng.), Research and Production Association «Mars», Ulyanovsk. E-mail: sowa84@bk.ru
A.V. Tarasova - Post-graduate student, Ulyanovsk State Technical University. E-mail: darkness23@mail.ru