ABSTRACT
Equation of motion including nonlinearity due to the dry friction force has been developed based on the analysis of the intraluminal stresses in material being subject to harmonic force. Harmonic linearization of the sgn function resulted in reduction of motion equation to the linear form. The solution of model equation allowed identification of evolutionary and oscillatory components of material vibration thickening process (without any change in its mass and at constant resistance). The obtained dependence of layer thickening rate on the material rheological characteristics includes the working surface vibration parameters in an explicit form. This study result could be useful at the screen operational conditions determination.
