Математичне моделювання та результати експериментальних досліджень процесу вібропневмоімпульсного поділу насіння за густиною

Abstract

The results of the mathematical simulation of the movement of grain material on the surface of the perforated deck of the vibro-pneumatic-impulse separator have been presented. Both force and kinematic models were employed, considering the geometric characteristics of the perforated deck surface in dynamic interaction with the kinematic indicators of processing. The calculations based on the proposed model allow for determining the trajectories of movement, velocities, and accelerations of the grain seeds within the grain medium under the combined action of vibrations and the pneumatic-impulse flow. As a result of the scientific research and analysis of the forces created according to the developed mathematical model, it has been established that the most significant influence on the process of grain material movement, both in the horizontal and vertical directions, is exerted by the impulse force (pulsations) of the air flow, the pressure force of the underlying layers of the grain medium (for seeds in the middle part and on the surface of the perforated deck), frictional forces, the weight of the seeds, and the Archimedean force. Therefore, in order to intensify the process of fractionation of the grain medium and increase the specific productivity of the vibro-pneumatic-impulse separator, it is necessary to increase the force of the pulsating air flow, the force of inertia of the oscillatory motion, friction, and lateral pressure on the seeds within the grain medium.