TY JOUR TI Modal analysis of oscillations of tree vegetation branches taking into account the dynamics of the cutting rotor KW brush cutter rotor KW mathematical modeling KW modal analysis KW blade impact KW branch KW energy distribution by modes KW computer-aided design (CAD) systems JO Forestry Engineering Journal AU Bukhtoyarov, L.D. PY 2026 IS 16 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov