The paper shows the advantage of the efficiency of asymmetric directed oscillations in front of symmetrical directed oscillations for the implementation of several technological operations. The method is given for calculating the system's dynamiс factor of two- and threestages' vibrators with directed asymmetric oscillations. Some recommendations are analyzed for the ratios of the unbalances' static moments for a two- and three-stage vibrating device. Rational values of the system's dynamic factor of two- and three-stage vibrating devices are obtained