TY JOUR TI Justification operation modes of column rotation mechanism of forest manipulator with energy-saving hydraulic drive KW energy saving KW damper KW hydraulic drive KW manipulator KW mathematical model JO Forestry Engineering Journal AU Bukhtoyarov, L.D. AU Dolzhenko, S.. AU Popikov, V.P. PY 2013 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov