Abstract: The paper gives a preliminary study on a few types of automatic vibrating loading devices about its vibrating system designs selection of parameters, and calculation of productivity. The criterions of the motion of the loaded pieces is discussed) and a criterion formula is deduced. The equations of motion of the elastic system of avibrating device, Stimulated by eccentric rotating mass. Are given together with experimental researches. An analysis of the non-linear equation of motion of the loaded pieces based on the principle of harmonic approximation is proposed for two dirfferent types of vibrating Sources. An engineering approximating formula for the calculation of the mean velocily of the loadedp iecesis presented together with experimental data. The application of electronic analog computer to study the motion of the loaded pieces is suggested together with the principle block diagram.