TY JOUR TI COMPARATIVE ANALYSIS OF RESISTING TO DIGGING FORCES EFFECTING STOCK BUCKET OF EXCAVATOR AND CYLINDRICAL BUCKET KW excavator KW bucket KW moment of force KW productivity KW digging KW soil KW hydro-cylinder JO Bulletin of Bryansk state technical university AU Buryy, G.G. AU Scherbakov, V.S. AU Poteryaev, I.K. PY 2020 IS 2020 PB Bryansk State Technical University