Фахові видання
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Item Analiza wybranych wyników badań instalacji solarnych w laboratorium OŹE w Zespole Szkół Elektrycznych nr 1 w Krakowie oraz Połtawskiej Państwowej Akademii Rolniczej(2010) Tytko, R.; Brykun, O. M.; Брикун, Олександр МиколайовичItem Analytical Determination of Reactive Forces for Curvilinear Bars with a Flat Axis of Arbitrary Shape / Аналітичне визначення реактивних зусиль для криволінійних брусів із плоскою віссю довільної форми(2019-12) Ковальчук, Станіслав Богданович; Горик, Олексій ВолодимировичItem Analytical Modeling of Concentrated and Localized Loads of Bars With a Curvilinear Flat Axis. Part 2. Modeling Localized Loads and Application Examples / Аналітичне моделювання зосереджених та локалізованих навантажень брусів із криволінійною плоскою віссю. Частина 2. Моделювання локалізованих навантажень та приклади застосування(2019-09) Ковальчук, Станіслав БогдановичItem Bactericidal Disinfection of Activated Carbon from Aerobic Microorganisms, Yeasts and Molds(2022-02) Semenov, A. O. ; Sakhno, T. V.; Hmelnitska, Y. V.; Semenova, N.; Семенов, Анатолій Олексійович; Сахно, Тамара Вікторівна; Хмельницька, Євгенія ВікторівнаItem Basic Stress-Strain State of a Multilayer Circular Ring under the Action of Mutually Opposite Normal Forces / Основное напряженно-деформированное состояние многослойного кругового кольца под действием взаимно противоположных нормальных сил(2019-03) Ковальчук, Станіслав Богданович; Горик, Олексій ВолодимировичItem Basic Stress-Strain State of a Multilayer Symmetric Circular Arch under the Action of Normal Forces in the Middle Section. Report 1. Arches of High Curvature / Аналітичний розв’язок задачі згину багатошарової симетричної кругової арки під дією нормальної сили у середньому перерізі. Повідомлення 1. Арки великої кривизни(2019-06) Ковальчук, Станіслав Богданович; Горик, Олексій ВолодимировичItem Combined method of UV treatment and ozonation during water disinfection in swimming pools(2021-11) Semenov, A. O. ; Vyzhva, S.; Sakhno, T. V.; Semenova, N.; Семенов, Анатолій Олексійович; Сахно, Тамара ВікторівнаItem DETERMINATION OF ELASTOPLASTIC COEFFICIENT OF SHOCK INTERACTION OF SPHERICAL INDENTER WITH DEFORMABLE HALFSPACE(Eastern-European Journal of Enterprise Technologies, 2013-01) Горик, Олексій Володимирович; Ковальчук, Станіслав Богданович; Шулянський, Г. А.Erosive wear due to contact of metal surfaces with flying solid particles is a typical problem of machinery. The intensity of wear depends on the hardness of the material of wearing surface and the kinetic energy of moving solid particles. A measure of wear is associated with the parameters of the track left by a particle on the surface of parts. Thus the problem of linking of these components of the process of shock interaction of counter-bodies arises.On the basis of the elastoplastic model of shock interaction of a solid particle with a flat metal surface we have created a method of determining the coefficient, which characterized the elastoplastic properties of deformable half-space at dynamic imbedding of a spherical indenter in it. This allowed predicting the intensity of erosive wear. The coefficient was determined on the basis of existing or special laboratory results of studies of shock embedding of the indenter into prototypes, and on the basis of laboratory analytical calculations. This allowed us to summarize the available experimental data on the current input parameters of the considered process. The elastoplastic coefficient depends on the initial velocity and the diameter (mass) of attacking body and on the hardness of the material of the attacked half-space.Item Determining the effect of the direction of installing the cutting edges of shredder roller blades on process parameters(2023) Sheichenko V. O. ; Bilovod, O. I.; Skoriak, Yu. B.; Шейченко, Віктор Олександрович; Біловод, Олександра Іванівна; Скоряк, Юлія БорисівнаThis paper reports a study aimed at increasing the intensity of grinding of the stems of coarse-stemmed crops by establishing the influence of the orientation of the cutting edge of the cutter-shredder knives on the quality of the technological grinding operations. Analytical dependences of the planar movement of the roller-shredder were establishedand it was determined that for rollers with knives, the cutting edge of which is directed in the direction opposite to the direction of rotation: – exceeding the value of the vertical components of the total forces of resistance of the knives, which made it possible to increase the values of forces, and, as a result, more intensive destruction of the layer of plant remains; – exceeding the values of the driving force of the knives based on the dependence of the driving force on structural and kinematic parameters (roller weight, drum radius, blade height, blade inclination angle, acceleration). Experimental studies have established an excess of up to 20 % of the quality indicators of milling sunflower and corn stems with roller knives, the cutting edge of which is directed in the direction opposite to the direction of rotation.Item Disinfection of Swimming Pool Water by UV Irradiation and Ozonation(2022-02) Semenov, A. O. ; Sakhno, T. V.; Семенов, Анатолій Олексійович; Сахно, Тамара ВікторівнаItem Disinfection of water contaminated with E.coli by using combination of electrolysis, photochemical treatment and ultrasonic: Role of hydroxyl radical formation and generation of singlet oxygen(2022-08) Barashkov, N. N.; Irgibayeva, I.; Sakhno, T. V.; Semenov, A. O. ; Aldongarov, Anuar; Сахно, Тамара Вікторівна; Семенов, Анатолій ОлексійовичItem Dynamics of wear of the cutting elements of tillers(Warsaw University of Life Sciences, 2015) Дудніков, Анатолій Андрійович; Біловод, Олександра Іванівна; Пасюта, Андрій Григорович; Горбенко, Олександр Вікторович; Келемеш, Антон ОлександровичDynamics of wear of the cutting elements of tillers. The paper discusses theoretical studies of wear of the cutting elements of working bodies of tillers to develop their technological process of hardening, providing on the one hand increase their longevity, and with another – providing quality tillage. It shows the ependence of the wear rate on the length of the cutting edge cultivator paws. The interaction of the blade working organs of tillers of the soil with the environment was characterized. The diagram of the forces acting on the blade ody and working movement direction in the soil was given. The analysis presents dependence between the linear wear lancet cultivators paw thickness and such factors as the way of friction, normal specific dynamic ressure of the soil, the hardness of the material clutches, friction area. The paper shows the effect of the angle between the polar axis and the radius of curvature of the cutting edge of the blade cultivator paws on the value of its wear. The regularities of changes in the intensity of wear feet are observed along the length of its cutting edge.Item Efficiency of seeds' germination in pre-sowing irradiation by UV-light of different spectral composition(2021-08) Marenych, M. M.; Semenov, A. O. ; Sakhno, T. V.; Barashkov, N. N.; Маренич, Микола Миколайович; Семенов, Анатолій Олексійович; Сахно, Тамара ВікторівнаItem Estimation model of the diesel engine fuel system with an electromechanical device to intensify fuel supply(2019) Ivanov, O. M.; Kharak, R. M.; Kostenko, O. M.; Arendarenko, V. M.; Nazarenko, A.; Pushka, A.; Sarana, V.; Іванов, Олег Миколайович; Харак, Руслан Миколайович; Костенко, Олена Михайлівна; Арендаренко, Володимир МиколайовичItem INFLUENCE OF UV RADIATION ON BIOLOGICAL PROPERTIES AND WATER ABSORPTION DURING PRE-SOWING IRRADIATION OF WINTER RAPESEEDS / Вплив УФ-випромінювання на біологічні властивості та водопоглинання при передпосівному опроміненні насіння ріпаку озимого(2021-12) Семенов, Анатолій Олексійович ; Сахно, Тамара Вікторівна ; Семенова, Наталія Володимирівна; Ляшенко, Віктор ВасильовичItem Influence of UV Radiation on Physical And Biological Properties of Rapeseed In Pre-Sowing Treatment(2021-02) Semenov, A. O. ; Sakhno, T. V.; Semenova, K.; Семенов, Анатолій Олексійович; Сахно, Тамара ВікторівнаItem Integral and differential relations for internal power factors in the bending of the bar with a curved flat axis of an arbitrary shape(Odessa State Academy of Civil Engineering and Architecture, 2018-03) Kovalchuk, S. B.; Goryk, O. V.; Ковальчук, Станіслав Богданович; Горик, Олексій ВолодимировичThe work is dedicated to the theoretical study of internal power factors in a curved bar with a flat axis of an arbitrary shape, that is in a plane bending condition by a surface load of an arbitrary type. The natural curvilinear cylindrical orthogonal coordinates associated with the structure of the bar and given by the characteristics of families of coordinate surfaces and Lame coefficients is used to describe the geometry of the bar and also the load distribution. The analysis of the equilibrium conditions of the elementary section of the bar made it possible to obtain integral relations between internal power factors and loads distributed on its longitudinal and end surfaces. The relations obtained were used to derive differential dependencies between internal power factors, that express the equilibrium conditions for the elementary section of a curved bar. Also, based on the equilibrium conditions of the bar cross-sections, integral relations between internal power factors and the stress state components were obtained. The presented integral and differential relations have a general form, invariant to the shape of the axis of the bar and allow to make a direct connection between loads and stresses. The results of the work can be used to solve theoretical and applied problems of a plane bending of curvilinear homogeneous and inhomogeneous bars with different types and combinations of external load.Item Investigation of the influence of vibration oscillations in the processes of strengthening processing of machine parts(2019) Дудніков, Анатолій Андрійович; Дудник, Володимир Васильович; Канівець, Олександр Васильович; Біловод, Олександра Іванівна; Бурлака, Олексій АнатолійовичОбъектом исследования является технологический процесс повышения надежности восстановления дисков сошников зерновых сеялок вибрационным упрочнением. Одним из самых проблемных мест является недостаточная изученность данного технологического процесса при восстановлении сельскохозяйственных машин. Для появления более глубоких представлений о процессе вибрационного упрочнения материала деталей необходимо проведение экспериментальных исследований по изучению влияния параметров обработки на степень упрочнения. В ходе исследования процесс вибрационного упрочнения наплавленной поверхности осуществлялся на изготовленной авторами данного исследования вибрационной установке. Для выбора параметров обработки и определения их оптимальных значений проведены микроструктурные исследования материала дисков. Выявлено и обосновано основные параметры упрочнения: амплитуду и частоту колебаний обрабатывающего инструмента, время упрочнения, и определены их значения: А=0,5 мм; n=1400 мин-1; t=20 с. В результате исследований установлено, что при вибрационном упрочнении структура материала более мелкозернистая. Увеличение микротвердости на поверхности наплавленного слоя можно объяснить бόльшим дроблением зерен и увеличением их числа. Это, в свою очередь, вызывает активизацию дислокаций во всех зернах, прилегающих к поверхности. При вибрационном деформировании протяженность границ зерен увеличивается и тем самым образуется больше зон скольжения дислокаций. Этим можно объяснить механизм упрочнения. Проведена оценка эксплуатационной надежности дисков по таким показателям: наработок за сезон и коэффициент технического использования. У сеялок с дисками, восстановленными приваркой сегментов с наплавкой сормайтом и вибрационным упрочнением, коэффициент технического использования в 1,053 раза выше, чем у сеялок с новыми дисками. Благодаря применению разработанной технологии восстановления обеспечивается возможность снизить в 1,49–1,70 раза скорость затупления лезвия. Это обеспечивает увеличения времени его работы. По сравнению с аналогичными известными технологиями, разработанная технология вибрационного упрочнения лезвий дисков обеспечивает наибольшую износостойкость и увеличение в 1,34 раза наработки по сравнению с новыми дисками.Item Maintenance of a loaded capability of reinforced concrete console girders of the VIP-grandstand at the stadium “Vorskla” in Poltava city(Державний науково-дослідний інститут будівельних конструкцій, 2018-02) Горик, Олексій Володимирович; Ковальчук, Станіслав БогдановичThe work is devoted to topical issues of a maintenance and renewal of a normal technical condition of constructional parts of the grandstand structure of the stadium “Vorskla” in Poltava city. The object of the research is reinforced concrete console girders of carcass frames of the stadium guest grandstand. Because of failed designing decisions connected with the reconstruction, these elements are practically at the end of their estimated reserve of loaded capability and require its improvement through arrangement of the construction strengthening. The optimal strengthening system in which the removal of the girder console part is limited by an additional elastic support with a preliminary compression force has been suggested. The transmission of the load estimated part to the elastic support of the strengthening system allowed to redistribute internal forces decreasing the estimated moment of flection on the supporting structure and in the bay avoiding a change of its sign. It is identified that in the process of the elastic element installment the intensity of the formed preliminary compression force will decrease by means of a girder secondary deflection. The estimates of its deflections taking into account a concentrated force formed by a working element of the strengthening system has been made for consideration of additional related deformation of the strengthening system and the girder. When identifying deflections, the reinforced concrete girder was considered as a composite discrete-heterogeneous bar made of homogeneous concrete matrix reinforced by very strong steel phases. It gave the possibility to take constitutive relation of the iteration movable model of the fold of composite discrete-heterogeneous bars as a basis of the reinforced girder deformation analysis under the conditions of limited deformation. General solutions of defining equations are received independently for each section of different stiffness. Received solutions at the stage of consideration of boundary conditions were adjusted by means of balancing of linkage and static deformation parameters at the edge of analyzing sections. Received amounts of deflections allowed to identify necessary constructive sizes of the strengthening system, with which the given level of the preliminary compression force in the working element is promoted in the designing position of the working element.Item Photobiological safety of lamps and lamp systems in agriculture(2021-06) Semenov, A. O. ; Sakhno, T. V.; Sakhno, Yu.; Семенов, Анатолій Олексійович; Сахно, Тамара Вікторівна