TY JOUR TI Evaluating the operational efficiency of harvesters using an energy-based approach KW harvester KW forwarder KW operation KW methodology KW efficiency KW technology KW operation KW conditions KW manipulator KW harvester head KW concentration KW felling KW delimbing KW bucking JO Forestry Engineering Journal AU Golyakevich, S.. PY 2026 IS 16 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov