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 Yu.N. Khizhnyakov - Ph.D. (Eng.), 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 National Research Polytechnic University. E-mail: kalif23@yandex.ru