%0 Journal Article %T Quality systems engineering hydraulic drive technological machines due to their calculations based on volumetric stiffness %A Rybak , A.. %K hydraulic drive, hydraulic system, volumetric stiffness, coefficient of volume stiffness. %J Actual directions of scientific researches of the XXI century: theory and practice %D 2015 %N 3 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov