Technology, energy, agriculture transport AIC

Serhii STEPANENKO – Senior Researcher, Doctor of Technical Sciences, 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 Agro-Industrial Production, National Academy of Agrarian Sciences of Ukraine (Hlevakha, Ukraine, e-mail: Stepanenko_s@ukr.net, https://orcid.org/0000-0002-8331-4632).

Alvian KUZMICH – senior researcher, candidate of technical sciences, senior research fellow 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 Agro-industrial Production of the National Academy of Agrarian Sciences of Ukraine (Hlevakha, Ukraine, e-mail: akuzmich75@gmail.com, https://orcid.org/0000-0003-3102-0840).

Viktor DNES – Senior Researcher, Candidate of Technical Sciences, Head of the Department of Modeling of Technological Processes in Plant Growing, Institute of Mechanics and Automation of Agro-industrial Production of the National Academy of Agrarian Sciences of Ukraine (Hlevakha, Ukraine, e-mail:  dnes.viktor@ukr.net, https://orcid.org/0000-0002-4166-2276).

Ihor POPADYUK – Junior Researcher, Department of Mechanical and Technological Problems of Harvesting and Post-Harvest Processing of Grain and Oilseed Crops, Institute of Mechanics and Automation of Agro-Industrial Production, National Academy of Agrarian Sciences of Ukraine (Hlevakha, Ukraine, e-mail:  i-popadyuk@ukr.net, https://orcid.org/0000-0001-5138-9499).

The article investigates the influence of kinematic parameters on the velocity of grain material movement along the working surface of the rotor in a vibro-centrifugal separator. The relevance of the study is determined by the need to increase the efficiency of cleaning and sorting processes of grain mixtures through the use of centrifugal and vibration fields, which enhance the differences between particles in terms of specific mass and aerodynamic properties. The paper examines the mechanics of motion of an individual grain particle on the surface of a conical rotor performing simultaneous rotational and vibrational motion. The main forces acting on the particle during its movement are determined, including the centrifugal inertial force, the inertial force caused by vibrational motion, the gravitational force, the reaction force of the rotor surface, and the friction force between the particle and the working surface.
Based on the analysis of the conditions for continuous contact motion of a particle along the rotor surface, a differential equation describing its motion was obtained, and relationships for determining the displacement and velocity of grain particles depending on the vibration phase were derived. The conditions ensuring stable particle motion in the direction of expansion of the conical rotor with periodic stops were established. An analytical expression for determining the average velocity of grain material movement was obtained, taking into account the vibration amplitude and frequency, the angular velocity of rotor rotation, the cone angle of the working body, and the coefficient of friction between the material and the rotor surface.
The theoretical studies were supplemented by experimental investigations carried out on laboratory and pilot experimental installations, where the influence of rotor rotational speed, grain feed rate, and air flow parameters on the separation efficiency was analyzed. It was established that an increase in the vibration amplitude and frequency, as well as in the angular velocity of the rotor, leads to an increase in the average velocity of grain particle movement along the working surface. The obtained results can be used to substantiate the design and operating parameters of vibro-centrifugal separators and to develop high-performance grain cleaning machines.

1.    Bredykhin, V., Pak, A., Gurskyi, P., Denisenko, S., & Bredykhina, K. (2021). Improving the mechanical-mathematical model of pneumatic vibration centrifugal fractionation of grain materials based on their density. Eastern-European Journal of Enterprise Technologies, 4(1(112), 54–60. https://doi.org/10.15587/1729-4061.2021.236938 [in English].
2.    Stepanenko S., Kotov B., Kuzmych A., Aneliak M., Volyk D., Melnyk V., & Kalinichenko R. (2025) Mathematical modeling of grain movement dynamics in the processes of air-centrifugal separation of grain material. Journal of Central European Agriculture, 26(2), 383–393. https://doi.org/10.5513/JCEA01/26.2.4301 [in English].
3.    Adamchuk, V., Bulgakov, V., Gadzalo, I. Ivanovs, S., Stepanenko, S., Holovach, I. Ihnatiev, Y. (2021) Theoretical study of vibrocentrifugal separation of grain mixtures on a sieveless seed-cleaning machine. Rural Sustainability Research, 46 (341), 116–124. https://doi.org/10.2478/plua-2021-0023 [in English].
4.    Tischenko, L. N., Olshanskiy, V. P., & Olshanskiy, S. V. (2010). A mathematical model of grain mixtures movement on vertical sieves of vibratory centrifugal separators. Tractors and Agricultural Machinery, 77(10), 48–51. https://doi.org/10.17816/0321-4443-69044 [in Ukrainian].
5.    Bakum, M., Kharchenko, S., Кovalyshyn, S., Krekot, M., Kharchenko, F., Shvets, O., Kiełbasa, P., Miernik, A. (2022) Identification of parameters of the separation process of safflower seed material on sieves. Journal of Physics: Conference Series, 2408, 012013. https://doi.org/10.1088/1742-6596/2408/1/012013 [in English].
6.    Kharchenko, S., Borshch, Y., Kovalyshyn, S., Piven, M., Abduev, M., Miernik, A., Popardowski, E., Kiełbasa, P. (2021) Modeling of aerodynamic separation of preliminarily stratified grain mixture in vertical pneumatic separation duct. Applied Sciences, 11(10), 4383. https://doi.org/10.3390/app11104383 [in English].
7.    Stepanenko, S., Kotov, B., Kuzmych, A., Shvydia, V., Kalinichenko, R., Kharchenko, S., Shchur, T., Kocira, S., Kwaśniewski, D., Dziki, D. (2022) To the theory of grain motion in an uneven air flow in a vertical pneumatic separation channel with an annular cross section. Processes, 10 (10), 1929. https://doi.org/10.3390/pr10101929 [in English].
8.    Banjac, V., Pezo, L., Pezo, M., Vukmirović, Đ., Čolović, D., Fišteš, A., Čolović, R. (2017) Optimization of the classification process in the zigzag air classifier for obtaining a high protein sunflower meal – Chemometric and CFD approach. Advanced Powder Technology, 28 (3), 1069–1078. https://doi.org/10.1016/j.apt.2017.01.013 [in English].
9.    Vasylkovskyi, O., Vasylkovska, K., Moroz, S., Sviren, M., Storozhyk, L. (2019) The influence of basic parameters of separating conveyor operation on grain cleaning quality. INMATEH - Agricultural Engineering, 57 (1), 63–70. [in English].
10.    Petrenko, D. I., & Netesa, V. E. (2023). Analytical investigations of centrifugal pneumatic separator of grain mixtures [Conference abstracts]. NULES of Ukraine. [in Ukrainian].
11.    Kotov, B., Stepanenko, S., Tsurkan, O., Hryshchenko, V., Pantsyr, Y., Garasymchuk, I., Spirin, A., Kupchuk, I. (2023) Fractioning of grain materials in the vertical ring air channel during electric field imposition. Przeglad Elektrotechnicznythis, 99 (1), 100–104. https://doi.org/10.15199/48.2023.01.19 [in English].
12.    Aliiev, E., Gavrilchenko, A., Tesliuk, H., Tolstenko, A., Koshul’ko, V. (2019) Improvement of the sunflower seed separation process efficiency on the vibrating surface. Acta Periodica Technologica, 50, 12–22. https://doi.org/10.2298/apt1950012a [in English].
13.    Pezo L., Banjac V., Pezo M., Jovanović A, Djuragic O, Čolović D., Colovic R. (2020) Mathematical model, numerical simulation and optimization of rotating valve feeder in animal feed production. Animal Feed Science and Technology, 272, 114741. https://doi.org/10.1016/j.anifeedsci.2020.114741 [in English].
14.    Hu Z., Zeng H., Ge Y., Wang W., Wang J. (2021) Simulation and Experiment of Gas-Solid Flow in a Safflower Sorting Device Based on the CFD-DEM Coupling Method. Processes, 9(7), 1239. https://doi.org/10.3390/pr9071239 [in English].
15.    Aneliak, M., Kuzmych, A., Stepanenko, S., Lysaniuk V. (2023) Study of the process of threshing leguminous grass seeds with a drum-type threshing device. INMATEH - Agricultural Engineering, 71 (3), 83–92. https://doi.org/10.35633/inmateh-71-06 [in English].
16.    Bredykhin, V., Bogomolov, A., Kis-Korkishchenko, L., Pak, A., Pak, A. (2023) Proving the possibility to rationalize the process of seed materials separation with a vibro-pneumatic centrifugal separator using a theoretical model. Eastern-European Journal of Enterprise Technologies, 6(1(126), 13–21. https://doi:10.15587/1729-4061.2023.291114 [in English].
17.    Tishchenko, L., Kharchenko, S., Kharchenko, F., Bredykhin, V., Tsurkan, O. (2016) Identification of a mixture of grain particle velocity through the holes of the vibrating sieves grain separators. Eastern-European Journal of Enterprise Technologies, 2(7(80)), 63–69. https://doi.org/10.15587/1729-4061.2016.65920 [in English].
18.    Piven, M., Volokh, V., Piven, A., Kharchenko, S. (2018) Research into the process of loading the surface of a vibrosieve when a loose mixture is fed unevenly. Eastern-European Journal of Enterprise Technologies, 6/1(96), 62–70. https://doi:10.15587/1729-4061.2018.149739 [in English].
19.    Kroulík, M., Hůla, J., Rybka, A., & Honzík, I. (2016) Pneumatic conveying characteristics of seeds in a vertical ascending airstream. Research in Agricultural Engineering, 62(2), 56–63. https://doi.org/10.17221/32/2014-rae [in English].