Scientific Papers оf DonNTU Mechanical Engineering and Machine Science最新文献

{"title":"JUSTIFICATION OF THE PARAMETERS OF THE METHOD OF USING GEOTHERMAL ENERGY FOR YEAR-ROUND WATER SUPPLY OF CONCRETE PRODUCTION ENTERPRISES","authors":"Maryna, Tavrel, Viktor Kostenko, Olha Bohomaz","doi":"10.31474/2308-5312-2023-1-15-4-11","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-4-11","url":null,"abstract":"Purpose: Substantiating the parameters of the method of using alternative energy sources for the year-round supply of thermostabilized water to enterprises producing concrete, due to establishing the regularities of the functioning of the geothermal heat exchanger. Methodology: a comprehensive approach, which includes theoretical studies of heat transfer from the massif to the geothermal heat exchanger, calculation and analytical method for determining the main parameters of the geothermal heat exchanger. Results: a subsurface thermal energy extraction installation was developed, due to the use of a geothermal heat exchanger, which will allow year-round production of thermostabilized water from shallow non-potable reservoirs. Scientific novelty: the study of heat transfer from the massif to the geothermal heat exchanger made it possible to determine the dependence of the length of the geothermal heat exchanger on its diameter. Water heating to 8°С in winter and water cooling to 20°С in summer will be provided by a geothermal heat exchanger with a length of 28 m and a pipe diameter of 0.5 m. Further increase in the diameter of the pipes will lead to a decrease in the efficiency of the TRP. Practical significance: obtaining thermostabilized water throughout the year will create conditions for year-round operation of concrete-making enterprises for the intensive restoration of Donbass.","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UNIVERSAL CALIBRATION VIBRATING MACHINE FOR VEGETABLES AND FRUITS","authors":"Irina Falko","doi":"10.31474/2308-5312-2023-1-15-28-35","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-28-35","url":null,"abstract":"Objective: to create a new promising design of a universal calibration machine for vegetables and fruits, suitable for use in food processing and canning industries. Research methods: scientific analytical techniques with theoretical and computational methods of designing machines and apparatuses of food production are used. Results: as a result of the research work, a project for a new design of a universal calibration vibrating machine of continuous operation for vegetables and fruits was created. The structure has a working body, which is a flat sieve created from fan-shaped steel bars, an additional working body performs reciprocating motion within the main Oran, which makes it impossible to jam The transported material in the sieve, equations were obtained for calculating the length of the sieve and sections for fractional separation of elements of the transported material. Scientific novelty: for the first time, the design of a calibration vibrating machine is proposed, where an additional working body has its own drive. Practical significance: the design of the machine given in the article is universal, can be used in food processing and canning industries. Keywords: vibrating machine, calibration body, design, movement, division into fractions, sieve, food production.","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DETERMINATION OF PRESSURE IN THE GASIFICATION CHAMBER OF THE GAS GENERATOR","authors":"Kostyantyn Pimenov","doi":"10.31474/2308-5312-2023-1-15-69-81","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-69-81","url":null,"abstract":"The purpose of the work: determination of patterns of pressure changes in the gasification chamber of the gas generator. Methodology of the work: a comprehensive approach, which includes theoretical studies of the processes of changing the thermodynamic parameters of the gas phase in the working chamber of the gas generator, a calculation and analytical method for determining the pressure of the working medium, depending on the temperature and its composition in the gas generator. Results: patterns of pressure changes in the working chamber of the gas generator at different operating modes were obtained. Scientific innovation: modeling and calculation of pressure indicators of the working medium in the working chamber of the gas generator, depending on the environmental factors: temperature and composition of the working medium, humidity of solid fuel, were carried out. It is taken into account that the gaseous phase is a real gas, according to the Van der Waals equation. An algorithm for calculating pressure based on data on quantitative indicators of gases in the mixture is proposed. The regularities of the behavior of the gas medium in the range of operating temperatures of the gas generator have been established. Practical significance: the obtained results made it possible to determine the pressure in the working chamber of the gas generator under different modes of its operation and to develop appropriate design solutions for the corresponding nodes (housing, sealing devices, etc.) of gas generators of narrow standard sizes. Key words: gas generator, combustion chamber, pressure, ideal gas, non-ideal gas, gas-air mixture, temperature.","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPARATIVE AND OVERVIEW CHARACTERISTICS OF DETAILING EQUIPMENT","authors":"Maksym Petriaiev, Aleksandr Herasymenko, Andrii Toporov","doi":"10.31474/2308-5312-2023-1-15-45-68","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-45-68","url":null,"abstract":"","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFICIENCY OF THE IMPULSE METHOD OF PROTECTION AGAINST HYDRAULIC SHOCKS IN ENSURING THE SAFETY OF MINE OUTFLOWS","authors":"Mykhailo Overko, Svitlana Virych, Maryna Babenko","doi":"10.31474/2308-5312-2023-1-15-13-20","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-13-20","url":null,"abstract":"Purpose. Confirmation of the effectiveness of the impulse method of protection against hydraulic shocks, obtaining data for further generalization of research and development of a suitable device for the implementation of the proposed protection method. Methodology.To achieve the goal, a mathematical model was created that describes the transient process in the pipeline of a pumping unit equipped with a device for increasing hydraulic resistance after the pump unit is turned off. A computer experiment was conducted using the MATLAB software environment. Results.The effectiveness of the impulse method of protection against hydraulic shocks, which begin with a wave of pressure reduction, has been confirmed. Scientific novelty. An algorithm for calculating the transient process in the pipeline of a pumping unit equipped with a device for increasing hydraulic resistance after the pump unit is turned off has been developed. The research results were obtained, confirming the effectiveness of the proposed impulse method of protection against hydraulic shocks. Practical significance. Taking into account that when using jet diodes, the reverse resistance is insufficient for effective dissipation of hydraulic shock energy, a method is proposed, which consists in increasing the hydraulic resistance of the pipeline in both directions after turning off the pumping unit. The specified method is called pulsed, as it consists in a rapid change in local hydraulic resistance, which is created by special protection devices. This method of protection can be implemented using mechatronic-based devices. Keywords: mine drainage, hydraulic shock, pressure pipeline, transition process, impulse method, hydraulic resistance.","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF WIND SPEED ON WIND TURBINES WITH DFIG GENERATOR AT WIND POWER PLANTS","authors":"Olena Liubymenko, Oleksandr Shtepa, Pavel Belitskyi","doi":"10.31474/2308-5312-2023-1-15-21-27","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-21-27","url":null,"abstract":"The purpose of the work: Determination of the mechanical and electrical parameters of the turbine with a DFIG generator at different values of the wind speed at start-up by means of simulation in the Matlab Simulink software environment. Methodology: a comprehensive approach that includes theoretical research and solving the following tasks: to establish characteristic moments of time in the process of starting a plant with a DFIG generator as a source of electricity; determine the angular speed and braking torque of the turbine during its start-up at different wind speeds; determine the active and reactive power of the DFIG generator during its start-up at different wind speeds. Results: Simulation of the operation of the wind generator was carried out in the Matlab Simulink software environment, in which a system for obtaining electrical energy from wind energy (DFIG) was built. The reactive power of electric motors, the efficiency of which depends on the power factor, is presented Scientific novelty: when the wind speed changes, a change in reactive power and a redistribution of the electric moment of the generator and the torque of the wind are observed. Full power, which is the vector sum of active and reactive power, and is supplied to the network by electric generators. Analysis of graphical dependencies allows you to see changes in time of active and reactive power, which cause changes in torque and speed of rotation in the wind generator. Practical significance: Studying the processes in the wind generator with the help of the proposed model allows you to compare the parameters of their operation under different modes and given wind speeds, determine the maximum values of the mode parameters, and obtain the necessary information for the implementation of reactive power compensation measures. The proposed model also makes it possible to find ways to improve the wind generator and the system for obtaining electrical energy for the operation of enterprises during the intensive reconstruction of Donbas. Key words: energy, active power, reactive power, wind generator, wind speed, transformer, generator, torque, blade rotation speed","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"NCREASING THE EFFICIENCY OF MILLING THE SURFACES OF ENDOPROTHESES","authors":"Оleksandr Miroshnychenko, Viktor Serhiienko","doi":"10.31474/2308-5312-2023-1-15-36-44","DOIUrl":"https://doi.org/10.31474/2308-5312-2023-1-15-36-44","url":null,"abstract":"Purpose to work: is to increase the efficiency of milling endoprosthesis components, taking into account their kinematic characteristics. Methodology: theoretical research was carried out on the basis of mathematical analysis, computer modeling using modern software and computing equipment. The PowerMILL CAM system was used for statistical processing of milling trajectories. Results: when manufacturing endoprosthesis components, the best processing strategies were \"Selection of 3D model by model shift\" and \"Selection of 3D model by shift\". These two strategies give the lowest idle time for the lowest core processing time. Machine processing time when using the strategies \"3D model selection\" by model shift and \"3D model selection\" by shift is reduced by 2 times compared to the \"3D model selection\" raster strategy, and by 3 times compared to the \"3D model selection\" strategy Vortex. However, it should be noted that all 4 studies were conducted at the same cutting modes, which are not typical for high-speed milling. Vortex's \"3D Model Selection\" is ineffective in these cutting modes due to the fact that it is designed exclusively for high-speed milling. \"Sampling a 3D model\" with a raster also turned out to be ineffective due to the fact that it is intended for work on open planes. Scientific novelty: the most effective milling strategy for the manufacture of endoprosthesis components is proposed. Practical significance: recommendations for the use of milling strategies are given. Key words: milling, strategy, endoprosthesis, idle movements, model, technological process, operation, machine time.","PeriodicalId":488727,"journal":{"name":"Scientific Papers оf DonNTU Mechanical Engineering and Machine Science","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135059425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}