Електронний репозитарій ПДАУ
Полтавський державний аграрний університет
Електронний репозитарій (сховище, архів) наукових публікацій – електронний архів результатів науково-дослідної роботи, публікацій науковців, викладачів, аспірантів та студентів університету, кваліфікаційних робіт студентів для їх централізованого зберігання та надання відкритого доступу до них світовій академічній спільноті у режимі онлайн.
Нові надходження
«Методика обліку та аналіз наявності та використання пально-мастильних матеріалів»
(2025) Мехедько, Максим Олександрович
У кваліфікаційній роботі розглядаються теоретичні положення та обґрунтовуються практичні рекомендації щодо методики обліку та аналізу наявності та використання пально-мастильних матеріалів.
Justification of the parameters of the active conical wood deformer
(2025) Падалка, Вячеслав Вікторович; Padalka, V. V.; Горбенко, Олександр Вікторович; Gorbenko, O. V.; Іванкова, Олена Володимирівна; Ivankova, O. V.; Дудник, Володимир Васильович; Dudnyk, V. V.; Горюнов, Богдан Олегович; Horiunov, B. O.
The object of research is the parameters of mechanisms for the destruction of anisotropic materials by a conical mechanical deformer. One of the known renewable energy sources is a material of plant origin (wood). Based on this, the search for optimal operating parameters and design features of working bodies for mechanized splitting of logs is relevant. Therefore, a new solution to the scientific problem is proposed, which consists in substantiating the main geometric parameters of an active conical deformer for splitting logs from wood at the lowest energy costs for its drive. The analysis conducted during the study showed a general positive feature of the principle of operation, in which the penetration of an active deformer of a conical shape perpendicular to wood fibers facilitates the destruction of their ties and has a more promising and productive design. A mathematical model for determining the force required to destroy a log of wood has been developed. The specified dependence takes into account the elastic characteristics of the material, the forces that exist between the fibers of anisotropic substance, the friction forces between the deformer material and wood, and its geometric parameters. It was determined that the necessary value that characterizes the physical and mechanical properties of wood is the force required to destroy the bonds between the fibers (coefficient of longitudinal destruction). Therefore, the values of the coefficient of longitudinal destruction were experimentally obtained, which were for pine – 2533 ± 66 N/m, oak – 5583 ± 145 N/m and aspen – 5000 ± 279 N/m. According to the research results, analytical recommendations for the geometric parameters of the active deformer were obtained. For pine material with a diameter of 0.15 m, the optimal cone length is in the range of 0.02–0.20 m at a cone angle of 20–90°. At the same time, the theoretical force for its destruction is 568–864 N. Similar results were also obtained for aspen and oak materials. This provides the opportunity to design the design of a conical wood deformer according to the specified ranges, which are optimal for each material or their groups.
Development of a biomass-fueled boiler for grain drying applications
(2025) Лапенко, Григорій Олександрович; Lapenko, G. O.; Lapenko, H.; Горбенко, Олександр Вікторович; Gorbenko, O. V.; Лапенко, Тарас Григорович; Lapenko, T. G.; Kolotii, S.
The article presents the results of research and development of an energy-efficient biomass-fired boiler designed for grain drying using locally available types of biomass as an alternative energy source. The relevance of implementing bioenergy technologies in agricultural production is substantiated, taking into account the rising cost of fossil fuels and the growing need for environmental sustainability in the agrarian sector. A comparative analysis of modern grain dryers has been conducted, highlighting their design features, advantages, and limitations in the context of biomass utilization. A boiler design has been developed, incorporating a two-section tubular recuperative heat exchanger, an automated fuel feeding system, and a multi-stage fan-driven air circulation mechanism. A distinctive feature of the proposed model is the use of high-temperature-resistant AISI 310S stainless steel in the combustion chamber, which ensures increased resistance to thermal stress, slag formation, and soot buildup. An air recirculation system for the drying chamber is also proposed to enhance the overall energy efficiency. Based on the proposed design, experimental thermal modeling was carried out. The results were generalized as temperature dependencies under various biomass feed rates. The obtained graphs and tabulated data confirm the system's predictable response to parameter changes, which is critical for automated process control and achieving high-quality grain treatment. Mathematical modeling of thermal regimes confirmed a high degree of correlation (R = 0.95) between the biomass feed rate and the temperature of air supplied to the dryer, as well as operational stability across a wide load range. The findings indicate that implementing such a boiler in agricultural practice can significantly reduce energy consumption, lower harmful emissions, and improve the autonomy of farming enterprises. The proposed technical solution offers a promising direction for modernizing grain drying equipment under current agricultural production conditions.
Determination on energy efficiency in corn grain drying
(2025) Горбенко, Олександр Вікторович; Gorbenko, O. V.; Лапенко, Григорій Олександрович; Lapenko, G. O.; Лапенко, Тарас Григорович; Lapenko, T. G.; Kolotii, S.
The object of research is the technological processes of corn grain drying, energy plants. One of the most problematic areas for agri cultural producers is providing energy for technological processes of bringing grain material to the indicators of product sales. And during the war and post-war period in Ukraine, this requires non-standard approaches and ways of implementation. Therefore, for operation in autonomous mode, the technology involves the use of biomass, electricity from solar panels and/or a diesel generator to supply the coolant to the grain drying zone. The availability of biomass is ensured by cleaning grain material after harvesting and crop residues. The study examined the technology of corn grain drying in "Agrotechservice" LLC of the Poltava district of the Poltava region (Ukraine) using the Saphir 2134 modular grain dryer with an improved biomass boiler. The results of studies of the operation of a grain dryer using different types of fuel (gas, diesel fuel, alternative fuel) showed that the energy consumption for reducing humidity by 1 ton-percent was: for gas – 1.5 m3; for diesel fuel – 1.8 l; for biomass – 3.4 kg. The total cost of drying on a Saphir 2134 grain dryer was obtained, which is 0.205 USD, which is 3.7 times less than when using natural gas and 9.2 times less than when using diesel fuel. This is due to the fact that the proposed technology involves the use of an improved biomass boiler and alternative energy sources. This provides the possibility of obtaining average daily savings using a grain dryer of this model with an improved biomass boiler, which will be about 1.1 thousand USD. Compared to similar corn grain drying processes, these studies have shown the economic feasibility of using biomass as an energy material for the production of thermal energy in the corn grain drying process.
Construction of a theoretical model of oscillations of a tillage (seeding) implement with independent mounting and two support rollers
(2026-09-10) Падалка, Вячеслав Вікторович; Padalka, V. V.; Горбенко, Олександр Вікторович; Gorbenko, O. V.; Khvostenko, D.; Лазоренко, Андрій Ігорович; Lazorenko, A. I.; Alpidovskyi, V.
This study investigates natural harmonic vibrations of a working implement equipped with a lever-type hitching system to the traction mechanisms and two support points on the surface. The task addressed relates to the absence of a generalized theoretical model for quantitative prediction of amplitude-frequency characteristics of such systems. This complicates the substantiation of rational structural and geometric parameters to enable technologically acceptable vertical deviations of working bodies under field irregularities and variable soil properties. A calculation scheme of a two-support lever mechanism has been devised, separating the implement’s intrinsic dynamics from the power unit motion and considering roller-soil contact as an excitation source. An energy-based mathematical model using Lagrange equations of the second kind has been constructed; parametric modeling revealed the decisive influence of attachment geometry and made it possible to determine rational parameter values. The length of the hitch lever to the power unit is 0.5 m, and the distance from the oscillatory system’s center of mass to the hitch point is 0.25 m. The advantage of the results involves the analytical relationship between the mechanism geometry, contact parameters, and vibration characteristics, which enables structural minimization of vertical deviations without mandatory use of active control. The identified regularities are explained by changes in the reduced inertial-elastic characteristics of the system when varying the lever arms and the position of the hitch point relative to the center of mass. The results could be practically applied at the stages of designing and adjusting implements provided that equivalent elastic-damping parameters of the" roller-soil" contact are identified for specific field and soil conditions and operating speeds.