V.M. Zakharov - Dr. Sc. (Eng.), Professor, Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI). E-mail: gilvv@mail.ru S.V. Shalagin - Dr. Sc. (Eng.), Associate Professor, Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI). E-mail: sshalagin@mail.ru B.F. Eminov - Ph.D. (Phys.-Math.), Associate Professor, Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI). E-mail: bulfami@mail.ru