TY JOUR TI Features free and compelled fluctuations of mechanical systems KW the compelled fluctuations KW free fluctuations KW oscillatory system JO Actual directions of scientific researches of the XXI century: theory and practice AU Belyaev, A.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov