T.S. Legotkina - Ph.D. (Eng.), Associate Professor, Department of Automation and Telemechanics, Perm National Research Polytechnic University. E-mail: luda@at.pstu.ac.ru Y.N. Khizhnyakov - Dr.Sc. (Eng.), Professor, Associate Professor, Department of Automation and Telemechanics, Perm National Research Polytechnic University. E-mail: luda @ at.pstu.ac.ru V.S. Nikulin - Student, Department of Automation and Telemechanics, Perm State National Research University. Е-mail: loskutov90@mail.ru