TY JOUR TI SIMULATION MODELING OF RECUPERATIVE SPRING-HYDRAULIC FIFTH-WHEEL COUPLING OF FOREST TRACTOR WITH SADDLE TRAILER KW logging KW timber haulage KW logging tractor KW saddle trailer KW recuperative spring-hydraulic fifth wheel coupling KW forest road KW road train efficiency JO Forestry Engineering Journal AU Posmetev, V.I. AU Nikonov, V.O. AU Posmetev, V.V. AU Avdyuhin, A.V. PY 2021 IS 10 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov