N.P. Petrov1, S.N. Petrova2, N. V. Korzhavina3, E. V. Lisovsky4

1 Cheboksary Institute (branch) Moscow Polytechnic University (Cheboksary, Russia)

2,3 Technical University of the Ural Mining and Metallurgical Company (Verkhnyaya Pyshma, Russia)

3 Ural State Low University (Ekaterinburg, Russia)

2  Technical University of the Ural Mining and Metallurgical Company (Verkhnyaya Pyshma, Russia)

4  Kaluga branch of the Bauman Moscow State Technical University (Moscow, Russia)