Факультет технічних систем і енергоефективних технологій (ТеСЕТ)
Permanent URI for this communityhttps://devessuir.sumdu.edu.ua/handle/123456789/25
Browse
48 results
Search Results
Item Wear Resistance Improvement of Linear Block-Polyurethanes Under Conditions of Liquid Friction(Sciendo, 2021) Panda, A.; Anisimov, V.M.; Anisimov, V.V.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn OleksandrovychA significant disadvantage of parts made of linear block polyurethanes under conditions of friction contact in the presence of an aqueous medium is the intensification of hydrolysis processes and decrease in volume strength. It was proposed to slow down the hydrolysis of polyurethanes in three ways: by directed changes in chemical struc-ture, by electromagnetic radiation of different intensities and by creation of composite materials, based on the principle of additional intermolecular crosslinking at the manufacturing and hot processing stages. The conditions for the formation of a smooth wear-resistant surface that protects the material from rapid destruction are re-vealed.Item Influence of non-metallic inclusions on the corrosion resistance of stainless steels in arc surfacing(MM Science Journal, Czech Republic, 2021) Pandova, I.; Makarenko, V.; Mitrofanov, P.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Гребеник, Людмила Іванівна; Гребеник, Людмила Ивановна; Hrebenyk, Liudmyla IvanivnaThe influence of non-metallic inclusions on the corrosion resistance of stainless steel of the austenitic-martensitic class, deposited in one layer with flux-cored wire under the flux by the arc method in the mode of stationary and pulsed arc burning, has been studied. In the latter case, the wire feed impulse was 0.5 and 0.7 Hz. The selected surfacing conditions, with both methods of the process, contribute to the formation of non-metallic inclusions of complex composition and structure in the deposited metal, including those containing calcium and its compounds with other elements, which are classified as corrosive, accelerating the occurrence of corrosion phenomena.Item Increasing of wear resistance of linear block-polyurethanes by thermal processing methods(MM Science Journal, Czech Republic, 2021) Panda, A.; Anisimov, V.M.; Anisimov, V.V.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Pandova, I.A significant imperfection of parts made from linear block polyurethanes under conditions of friction contact in the presence of water medium is an intensification of hydrolysis processes and reduction of bulk strength. In order to slow down the hydrolysis process, samples of the polyurethanes were subjected to three types of thermal impacts: thermal processing during some time, infrared and laser irradiation. It has been established that processing in thermal fields of different intensity allows 5-10 times increase of wear resistance of these materials during friction in water medium.Item Qualimetric method of assessing risks of low quality products(MM Science Journal, Czech Republic, 2021) Trishch, R.; Nechuiviter, O.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Vasilevskyi, O.; Tsykhanovska, I.; Yakovlev, M.Risk assessment is an integral part of an enterprise's quality management system. The risk of low quality products is the most significant risk, as it is directly related to the concept of enterprise competitiveness. The paper analyzes the scientific papers related to the assessment of the quality of products, processes and services, their disadvantages, possible limits of application. It is proposed to use mathematical dependences to obtain estimates of product quality indicators on a dimensionless scale. Knowing the density function of random variables of product quality indicators and knowing the mathematical dependence of their estimates on a dimensionless scale, it is proposed to obtain the density function of estimates. Knowing the function of the density of estimates of quality indicators, it is proposed to find the probabilities of risks of the assessment of quality indicators in any given interval on a dimensionless scale. A method for assessing the risks of low quality products has been developed.Item Modeling of the manufacturing systems state in the conditions of the lean production(MM Science Journal, Czech Republic, 2021) Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Гребенюк, Лариса Федорівна; Гребенюк, Лариса Федоровна; Hrebeniuk, Larysa Fedorivna; Krenicky, T.; Zaborowski, T.This article investigates the hierarchy of the manufacturing system, which consists of a set of interrelated processes aimed at converting information, knowledge, energy, materials, and other resources into value for the consumer based on the principles of lean production. Modern manufacturing systems are becoming more and more complex to manage. The problems that need to be solved are associated with a significant number of time-varying parameters, large time delays, high non-linearity of processes, and a complex relationship between input and output parameters. Depending on the parameters of internal components and characteristics of external conditions, the state of manufacturing systems can change in an unpredictable manner. The paper considers many types of discrete states in which the system can be. The estimation of the probability of finding the manufacturing system in any of the given states was carried out using discrete Markov analysis. The article also presents the results of studies of possible transitions between states in which the production system is presented in the form of a transition matrix.Item About wear resistance of linear block-polyurethanes(MM Publishing, 2020) Anisimov, V.M.; Anisimov, V.V.; Panda, A.; Pandova, I.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn OleksandrovychLinear block-polyurethanes (BPU) are finding more and more practical applications in industry, and their recipe range is rapidly expanding. It is shown that the evaluation of the tribotechnical characteristics of BPU depending on hardness, as suggested by ISO 16365-1:2014 P1, is inaccurate and requires further research to establish the relationship between structure and properties of polyurethanes, taking into account their chemical structure and the type of initiaal components. The dependences of the tribotechnical characteristics of linear block-polyurethanes under friction with steel without external lubrication and in the liquid on the parameters of structural organization of the polymer were studied: at the molecular level (oligooethers, oligoesters), at the topological level (change in the molecular weight of oligomers from 500 to 2000), at supramolecular level (influence of crystallinity), at the morphological level (content of hard phase). The change in the roughness of steel counterbody during friction of polyurethanes with the content of hard blocks 20%, 50%, and 70% was also studied. A method is proposed for increasing the wear resistance of polyurethanes by thermal diffusion saturation of the surface with silicon carbide particles.Item Enhancing Efficiency by Implementation of Integrated Management System in Order to Align Organisational Culture and Daily Practice(Sciendo, 2020) Залога, Вільям Олександрович; Залога, Вильям Александрович; Zaloha, Viliam Oleksandrovych; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Рибалка, Ірина Миколаївна; Рыбалка, Ирина Николаевна; Rybalka, Iryna Mykolaivna; Pandova, I.; Zaborowski, T.The main aim of presented article is present methodology how sophisticated products as compressor equipment can be considered and analyzed as a complex technical system which consists of jointly operating components – a set of hardware, software, operational staff and documented information. In process modeling, these components can be in different processes of inputs, outputs, mechanisms (resources) or management. Based on the regulatory requirements for each component of the system, a key indicator efficiency can be identified. This will allow to control the process and make appropriate decisions to improve the system. The application of the proposed methodology for the development and implementation of an integrated management system reduce the cost of resources and significantly improve the quality of the implementation of processes.Item Фізико-механічні властивості багатокомпонентних і багатошарових нітридних покриттів(Сумський державний університет, 2018) Саранчук, А.В.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn OleksandrovychЕкспериментальні та теоретичні дослідження покриттів показують, що плівки, отримані при вибраних параметрах осадження, мають нанокомпозитну структуру і складаються з нанокристалітів.Item Апатит-біополімерні матеріали та покриття для біомедицини(Сумський державний університет, 2018) Панченко, В.А.; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn OleksandrovychОдним із важливих завдань сучасного медичного матеріалознавства є створення біосумісних матеріалів для тканинної інженерії з метою заміщення кісткових дефектів та дефектів м'яких тканин у практиці хірургічної та пластичної медицини.Item Процесний та функціональний підходи при розробці системи управління якістю(Сумський державний університет, 2018) Залога, Вільям Олександрович; Залога, Вильям Александрович; Zaloha, Viliam Oleksandrovych; Дядюра, Костянтин Олександрович; Дядюра, Константин Александрович; Diadiura, Kostiantyn Oleksandrovych; Рибалка, І.М.За рахунок застосування процесного підходу до управління організацією можна значною мірою вдосконалювати її діяльність та забезпечувати якість продукції, що виготовляється.