Vibrations in engineering and technology

Kotov Boris - Doctor of Technical Sciences, Professor of the Department of Agricultural Engineering and Systems Engineering, Institute of Higher Education "Podilskyi State University", (13 Shevchenka St., Kamianets-Podilskyi, 32316, e-mail: eetsapk@pdatu.edu. ua).

Stepanenko Serhii - Doctor of Technical Sciences, senior researcher, head of the department of mechanical and technological problems of harvesting and post-harvest processing of grain and oilseed crops, Institute of Mechanics and Automation of Agricultural Production (IMA APV NAAS) (Vokzalna St., 11/1, Glevakh , Fastivskyi district, Kyiv region 08631, e-mail: Stepsnenko_s@ukr.net).

Grushetskyi Serhiy - Candidate of Technical Sciences, Associate Professor of the Department of Agricultural Engineering and Systems Engineering, Institute of Higher Education "Podilskyi State University", (13 Shevchenka St., Kamianets-Podilskyi, Khmelnytskyi Region, 32316, e-mail: g.sergiy.1969@gmail.com).

Hryshchenko Volodymyr – candidate of technical sciences, senior lecturer of the Department of Automation and Robotic Systems named after Acad. I.I. Martynenko, National University of Bioresources and Nature Management of Ukraine (15 Heroiv Oborony St., Kyiv, 03041. e-mail: bepeck2001@rambler.ru).

It was established that the method of intensifying the course of the work process is the organization of supplying the layer with a pulsating flow of air. Using a pulsating air flow, it is possible to change the magnitude of the aerodynamic effect on the grain mass by changing the magnitude of the force pulse under conditions of constant speed. At the same time, the effect of the pulsating flow on the ability to move grains of different mass (density) will be different, which can intensify the separation of seeds by density. The study of the combined effect of vibrations and pulsating air flow on the stratification of the grain flow and separation by density is an important scientific and technical task.

The conducted analysis of publications revealed a promising possibility of using serial vibrating screen machines with a pneumatic system for the preparation of combined machines with a pneumatic system for the preparation of high-quality seeds, instead of vibro-pneumatic tables. To study the efficiency of the combined use of vibropneumoliquefied and pneumogravitational movement of the material.

It is substantiated that the intensifying effect of the pulsating flow consists in the different force of influence on light and heavy grains. The mathematical description of the process of separation of loose material by density is based on the equations of motion of a particle in an oscillating medium, which is valid for any continuous medium that has the property of inertness.

Formulated mathematical models of the processes of movement of components of grain material in the vibro-liquefied layer and in the air channel of the vibro-pneumocleaning machine will allow to determine the trajectories of the movement of grains in the working zones and, based on their analysis, to justify the parameters of the working bodies.

The approbation of the mathematical description of the processes of separation of the components of grain material confirmed the increase in the efficiency of the use of pulsating flows for the separation of grain by density.

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