S.F. Tyurin - Dr.Sc. (Eng.), Department «Automation and Telemechanics», Perm National Research Polytechnic University. E-mail: tyurinsergfeo@at.pstu.ru I.I. Bezukladnikov - Ph.D. (Eng.), Department «Automation and Telemechanics», Perm National Research Polytechnic University. E-mail: corrector@at.pstu.ru