TY JOUR TI EFFECTS OF IMPACTS OF COVERING ROLLERS ON GENERAL FORCES OF SMALL-SIZED TILLAGE MACHINE KW generalized forces KW potential energy KW drive moment KW soil resistance force KW roller center of mass KW moment of force KW periodic harmonic moments JO Vestnik of Kazan State Agrarian University AU Yunusov , G.. AU Anderzhanova, N.N. AU Valiev, A.R. AU Aleshkin, A.V. PY 2021 IS 16 PB Kazan state agrarian University