TY JOUR TI Comparative study of the process of forestry rippers with passive and active drive of working tools KW CAD KW disc ripper KW active and passive drive JO Actual directions of scientific researches of the XXI century: theory and practice AU Shabanov, M.L. AU Lysych, M.N. AU Ikonnikov, R.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov