%0 Journal Article %T Comparative study of the process of forestry rippers with passive and active drive of working tools %A Shabanov, M.L. %A Lysych, M.N. %A Ikonnikov, R.. %K CAD, disc ripper, active and passive drive %J Actual directions of scientific researches of the XXI century: theory and practice %D 2015 %N 3 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov