TY CONF TI FEATURES OF MATHEMATICAL MODELING OF THE WORKING PROCESS OF SIEVE MILLS GRAIN CLEANING MACHINES KW grain cleaning machine KW sieve mill KW displacement KW acceleration KW equation KW numerical solution KW approximation JO Modern technologies and automation of production AU Mba, E.C. AU Aksenov, I.I. PY 2022 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov