Pub Date : 2020-12-15DOI: 10.22363/2312-8143-2020-21-1-27-35
Y. Antipov, I. Shatalov, K. V. Shkarin, Anna S. Barybina, Yana A. Ogneva, Pavel D. Morozov
Nowadays, improving the efficiency of power plants by utilizing secondary energy resources is gaining more attention in the energy sector. In this paper, the combined cycle gas turbine (CCGT-420T) was considered, where exhaust heat from the main and auxiliary equipment is utilized, and sent to a water supply system through a closed-circuit heat exchanger, as a result, the heat transferred ( Q 6.4 MW) is rejected into the environment through a cooling tower. Moreover, an effective modelling method for utilizing heat in a closed cycle, using a steam compressing heat pump unit (HPU) is proposed. In addition, a calculation of the effectiveness of utilizing secondary energy resources depending on the number of HPU stages. In addition, the calculation of the effectiveness of the use of secondary energy resources depending on the number of stages of HPU was carried out. Several options of the model were discussed in this work, such as, two-, three-, and four-stage HPU and the coefficient of performance was calculated. Moreover, the work of these compressors for each option of the model was discussed in this work. Finally, the economic benefits of using of a multi-stage HPU instead of a traditional one-stage HPU during the annual operation of the CCGT-420T was discussed.
{"title":"Modeling an effective method to utilize secondary energy resources of a combined cycle gas turbine based on the CCGT-420T","authors":"Y. Antipov, I. Shatalov, K. V. Shkarin, Anna S. Barybina, Yana A. Ogneva, Pavel D. Morozov","doi":"10.22363/2312-8143-2020-21-1-27-35","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-1-27-35","url":null,"abstract":"Nowadays, improving the efficiency of power plants by utilizing secondary energy resources is gaining more attention in the energy sector. In this paper, the combined cycle gas turbine (CCGT-420T) was considered, where exhaust heat from the main and auxiliary equipment is utilized, and sent to a water supply system through a closed-circuit heat exchanger, as a result, the heat transferred ( Q 6.4 MW) is rejected into the environment through a cooling tower. Moreover, an effective modelling method for utilizing heat in a closed cycle, using a steam compressing heat pump unit (HPU) is proposed. In addition, a calculation of the effectiveness of utilizing secondary energy resources depending on the number of HPU stages. In addition, the calculation of the effectiveness of the use of secondary energy resources depending on the number of stages of HPU was carried out. Several options of the model were discussed in this work, such as, two-, three-, and four-stage HPU and the coefficient of performance was calculated. Moreover, the work of these compressors for each option of the model was discussed in this work. Finally, the economic benefits of using of a multi-stage HPU instead of a traditional one-stage HPU during the annual operation of the CCGT-420T was discussed.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47082131","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}
Pub Date : 2020-12-15DOI: 10.22363/2312-8143-2020-21-2-131-135
Aleksandr Pleshivtsev, V. Galishnikova
The research has established the main features of the current state and prospects for the development of intellectual resources (capital), which can lead to the formation of a new level of qualitative and quantitative indicators of traditional and non-traditional architectural systems. The article presents the conceptual apparatus of the phenomenon of Renaissance of intellectual capital as a modern form of development of intangible assets and a way to implement innovative technologies (from various fields of knowledge) in the process of architectural creativity. The features of the state and development of intellectual capital for solving architectural problems and construction practices of past historical epochs are considered. An algorithm for solving non-standard problems of architectural creativity (non-traditional, problematic situations) with the involvement of an intellectual resource has been developed. It is established that the intellectual resource is the basis of research and practical innovation, which is carried out in the specific context of the formation of non-traditional architectural systems, methods and methods to ensure the level of their manufacturability (design, manufacture, transportation, construction, operation). The availability of intellectual resources is a key factor in providing the necessary competitive advantages over traditional architectural systems and ways to organize them into architectural objects.
{"title":"“Renaissance” of intellectual capital, which is displayed in non-traditional (innovative) methods at forming in architectural systems","authors":"Aleksandr Pleshivtsev, V. Galishnikova","doi":"10.22363/2312-8143-2020-21-2-131-135","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-2-131-135","url":null,"abstract":"The research has established the main features of the current state and prospects for the development of intellectual resources (capital), which can lead to the formation of a new level of qualitative and quantitative indicators of traditional and non-traditional architectural systems. The article presents the conceptual apparatus of the phenomenon of Renaissance of intellectual capital as a modern form of development of intangible assets and a way to implement innovative technologies (from various fields of knowledge) in the process of architectural creativity. The features of the state and development of intellectual capital for solving architectural problems and construction practices of past historical epochs are considered. An algorithm for solving non-standard problems of architectural creativity (non-traditional, problematic situations) with the involvement of an intellectual resource has been developed. It is established that the intellectual resource is the basis of research and practical innovation, which is carried out in the specific context of the formation of non-traditional architectural systems, methods and methods to ensure the level of their manufacturability (design, manufacture, transportation, construction, operation). The availability of intellectual resources is a key factor in providing the necessary competitive advantages over traditional architectural systems and ways to organize them into architectural objects.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46474368","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}
Pub Date : 2020-12-15DOI: 10.22363/2312-8143-2020-21-4-254-259
Y. Pirogov, G. Kazaryan, V. Savvin
A proposal to use special electron cyclotron devices as effective converters of electromagnetic waves into direct current in modern microwave systems for wireless transmission of electrical energy to the Earth via a microwave channel from solar space power plants located on board geostationary satellites is considered. Such converters are a product of domestic development, they can have a conversion efficiency of more than 80%, they are insensitive to overloads and are several orders of magnitude more economical than the well-known semiconductor rectennas (rectifying antennas). Semiconductor rectennas, assembled from a multitude of individual semiconductor diodes with a Schottky barrier, in the process of nonlinear conversion of microwaves, generate parasitic radiation that forms a powerful electromagnetic background, which seriously interferes with the stable operation of information systems of special and general civil communications. In addition, the cost of semiconductor rectennas is several orders of magnitude higher than that of electron-cyclotron converters with the same input microwave power. Due to the high compactness of the electronic converters, they can also be installed on an intermediate satellite platform in the stratosphere, receiving the energy of the Sun through a laser beam from a geostationary orbit and transmitting it to the Earth with practically no loss through the microwave channel. The possibilities of using electron cyclotron converters in ground-based systems for wireless energy transmission are also promising. Already the first electron cyclotron converters, created at the Torii enterprise according to the project of the Lomonosov Moscow State University, had an efficiency of over 60% at an input microwave power of 10 kW.
{"title":"Electron cyclotron converters of microwaves in wireless power transmission systems","authors":"Y. Pirogov, G. Kazaryan, V. Savvin","doi":"10.22363/2312-8143-2020-21-4-254-259","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-4-254-259","url":null,"abstract":"A proposal to use special electron cyclotron devices as effective converters of electromagnetic waves into direct current in modern microwave systems for wireless transmission of electrical energy to the Earth via a microwave channel from solar space power plants located on board geostationary satellites is considered. Such converters are a product of domestic development, they can have a conversion efficiency of more than 80%, they are insensitive to overloads and are several orders of magnitude more economical than the well-known semiconductor rectennas (rectifying antennas). Semiconductor rectennas, assembled from a multitude of individual semiconductor diodes with a Schottky barrier, in the process of nonlinear conversion of microwaves, generate parasitic radiation that forms a powerful electromagnetic background, which seriously interferes with the stable operation of information systems of special and general civil communications. In addition, the cost of semiconductor rectennas is several orders of magnitude higher than that of electron-cyclotron converters with the same input microwave power. Due to the high compactness of the electronic converters, they can also be installed on an intermediate satellite platform in the stratosphere, receiving the energy of the Sun through a laser beam from a geostationary orbit and transmitting it to the Earth with practically no loss through the microwave channel. The possibilities of using electron cyclotron converters in ground-based systems for wireless energy transmission are also promising. Already the first electron cyclotron converters, created at the Torii enterprise according to the project of the Lomonosov Moscow State University, had an efficiency of over 60% at an input microwave power of 10 kW.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49226941","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}
Pub Date : 2020-12-15DOI: 10.22363/2312-8143-2020-21-1-7-13
P. Maldonado, V. A. Romanova, Messias De Jesus Augusto Campos
The article discusses a method for determining the relative eccentricity , used in calculating the thermal balance of an internal combustion engine sliding bearing. When performing this calculation, a number of temperature values are set in the bearing oil layer. For each set temperature, the engine oil viscosity value and the bearing load factor Ф are determined. To determine the relative eccentricity, graphical dependencies of the load factor on the relative eccentricity are used as input data. The thermal calculation of the sliding bearing showed that the accuracy of determining the relative eccentricity is of great importance. Their inaccurate definition leads to a failure of the thermal balance in the bearing. In addition, the method of determining the value of by the accepted value of the ratio of the working length of the bearing to the diameter of the connecting rod neck of the crankshaft (graphically) for this calculation is quite time-consuming. For this reason, the graphical method for determining has been replaced with an analytical one. Relative eccentricities were obtained using the least squares method. An algorithm has been developed for automated construction of transverse and longitudinal profiles of an oil pump with epicycloidal engagement.
{"title":"Computer#aided design of the pump profile with epicycloidal gearing using MathCad tools","authors":"P. Maldonado, V. A. Romanova, Messias De Jesus Augusto Campos","doi":"10.22363/2312-8143-2020-21-1-7-13","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-1-7-13","url":null,"abstract":"The article discusses a method for determining the relative eccentricity , used in calculating the thermal balance of an internal combustion engine sliding bearing. When performing this calculation, a number of temperature values are set in the bearing oil layer. For each set temperature, the engine oil viscosity value and the bearing load factor Ф are determined. To determine the relative eccentricity, graphical dependencies of the load factor on the relative eccentricity are used as input data. The thermal calculation of the sliding bearing showed that the accuracy of determining the relative eccentricity is of great importance. Their inaccurate definition leads to a failure of the thermal balance in the bearing. In addition, the method of determining the value of by the accepted value of the ratio of the working length of the bearing to the diameter of the connecting rod neck of the crankshaft (graphically) for this calculation is quite time-consuming. For this reason, the graphical method for determining has been replaced with an analytical one. Relative eccentricities were obtained using the least squares method. An algorithm has been developed for automated construction of transverse and longitudinal profiles of an oil pump with epicycloidal engagement.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43356349","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}
Pub Date : 2020-12-15DOI: 10.22363/2312-8143-2020-21-3-189-196
A. Yudin, Юдин Александр Викторович, Artem N. Stratienko, Стратиенко Артем Николаевич, M. M. Madumarov, Мадумаров Мухриддин Мухаммаджон угли, Margaryta A. Myrnenko, Мирненко Маргарита Александровна
At present, one of the promising directions of development in the field of information technologies is augmented reality, which offers access to real-world data through the device's camera using an interactive data display approach. Augmented reality is widely applied in various areas of life: beginning from game applications, finishing with professional applications for briefing, training for personnel in a manufacturing sector, heavy mechanical engineering and the high-tech sector, thereby providing an opportunity to use virtual instructions for implementation of the qualified operations. Also, the main way to apply augmented reality is location service - the possibility to track the position of objects on the geographic information map in real time. The article discusses ways of constructing routes in augmented reality on the field of location service data and explores the peculiarities of application. Problems identified when applying the above method are analyzed. An example of route construction is given on the map with reference to location service data and on the stage of augmented reality with calculated coordinates of route points. Methods of converting geographical coordinates into coordinates of augmented reality scene are presented.
{"title":"Construction of routes in augmented reality using GIS technologies","authors":"A. Yudin, Юдин Александр Викторович, Artem N. Stratienko, Стратиенко Артем Николаевич, M. M. Madumarov, Мадумаров Мухриддин Мухаммаджон угли, Margaryta A. Myrnenko, Мирненко Маргарита Александровна","doi":"10.22363/2312-8143-2020-21-3-189-196","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-3-189-196","url":null,"abstract":"At present, one of the promising directions of development in the field of information technologies is augmented reality, which offers access to real-world data through the device's camera using an interactive data display approach. Augmented reality is widely applied in various areas of life: beginning from game applications, finishing with professional applications for briefing, training for personnel in a manufacturing sector, heavy mechanical engineering and the high-tech sector, thereby providing an opportunity to use virtual instructions for implementation of the qualified operations. Also, the main way to apply augmented reality is location service - the possibility to track the position of objects on the geographic information map in real time. The article discusses ways of constructing routes in augmented reality on the field of location service data and explores the peculiarities of application. Problems identified when applying the above method are analyzed. An example of route construction is given on the map with reference to location service data and on the stage of augmented reality with calculated coordinates of route points. Methods of converting geographical coordinates into coordinates of augmented reality scene are presented.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45544661","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}
Pub Date : 2020-12-01DOI: 10.22363/2312-8143-2020-21-4-224-237
V. Andreev, V. A. Barinov, S. Varfolomeev, Y. Lachuga, V. Matyukhin, V. Panchenko, I. Y. Redko, A. Sigov, V. Stennikov
A brief description of the State Electrification Plan of Russia (GOELRO plan), developed on the initiative of V.I. Lenin by the GOELRO commission headed by G.M. Krzhizhanovsky and adopted on December 22, 1920 by the 8th All-Russian Congress of Soviets, as well as key directions of a long-term plan for research on the problem of the creation of the Unified Power System of the Country (UPS), developed by the commission under the leadership of G.M. Krzhizhanovsky in 1957, which laid the foundation for the formation of the UPS - the largest in the world at the end of the 80s centrally managed interconnected power system, is presented. The indicators of development and efficiency of the country's electric power industry are given. The essential part of the reforms in the electric power industry of Russia carried out at the beginning of the 21st century, their shortcomings that led to a decrease in the efficiency of the industry and the emergence of various kinds of bottlenecks and imbalances are analyzed. The processes of transformation of energy systems in the world are considered, as a result of which a new architecture of energy systems is created. The primary tasks facing the Russian power industry in these conditions are formulated.
{"title":"Creation of integrated energy supply systems","authors":"V. Andreev, V. A. Barinov, S. Varfolomeev, Y. Lachuga, V. Matyukhin, V. Panchenko, I. Y. Redko, A. Sigov, V. Stennikov","doi":"10.22363/2312-8143-2020-21-4-224-237","DOIUrl":"https://doi.org/10.22363/2312-8143-2020-21-4-224-237","url":null,"abstract":"A brief description of the State Electrification Plan of Russia (GOELRO plan), developed on the initiative of V.I. Lenin by the GOELRO commission headed by G.M. Krzhizhanovsky and adopted on December 22, 1920 by the 8th All-Russian Congress of Soviets, as well as key directions of a long-term plan for research on the problem of the creation of the Unified Power System of the Country (UPS), developed by the commission under the leadership of G.M. Krzhizhanovsky in 1957, which laid the foundation for the formation of the UPS - the largest in the world at the end of the 80s centrally managed interconnected power system, is presented. The indicators of development and efficiency of the country's electric power industry are given. The essential part of the reforms in the electric power industry of Russia carried out at the beginning of the 21st century, their shortcomings that led to a decrease in the efficiency of the industry and the emergence of various kinds of bottlenecks and imbalances are analyzed. The processes of transformation of energy systems in the world are considered, as a result of which a new architecture of energy systems is created. The primary tasks facing the Russian power industry in these conditions are formulated.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44844683","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}
Pub Date : 2019-12-15DOI: 10.22363/2312-8143-2019-20-3-254-260
A. Drozdov, Дроздов Александр Николаевич, Y. Gorbyleva, Горбылева Яна Алексеевна, E. I. Gorelkina, Горелкина Евгения Ильинична, N. Drozdov, Дроздов Николай Александрович
The proposed solution relates to fluidics and can be used, for example, in the extraction of oil and gas, the collection and preparation of oil, gas and water, the extraction of methane from methane beds, oil refining. The technical result is to increase the efficiency of a liquid-gas ejector by ensuring its work in the field of rational concentrations and salt composition, in which the intensification of energy exchange between the working fluid and the ejected gas is achieved. The essence of the proposed solution: the method of operation of a liquid-gas ejector involves injecting a working fluid with a power pump into the ejector nozzle, pumping gas with an ejector, creating, dispersing and increasing the pressure of a gas-liquid mixture with an ejector using aqueous solutions of salts as a working fluid. The values of the concentration and composition of salts in the working fluid are maintained within the range of rational concentrations and composition of salts, in which increased values of the efficiency of the ejector are achieved. Salts are added to the weakly mineralized aqueous solutions, and the highly mineralized aqueous solutions are diluted with fresh water. As the working fluid, the formation and/or incidentally produced waters of oil, gas, gas condensate and methane-coal deposits, which are aqueous solutions of salts, are used if the composition and concentration of salts in the produced and/or incidentally produced waters are within the range of rational concentrations and composition of salts in which provides an increase in the efficiency of the ejector. The boundaries of the field of rational concentrations and salt composition are preliminarily determined by laboratory bench studies.
{"title":"Increasing efficiency of work of a liquid-gas ejector","authors":"A. Drozdov, Дроздов Александр Николаевич, Y. Gorbyleva, Горбылева Яна Алексеевна, E. I. Gorelkina, Горелкина Евгения Ильинична, N. Drozdov, Дроздов Николай Александрович","doi":"10.22363/2312-8143-2019-20-3-254-260","DOIUrl":"https://doi.org/10.22363/2312-8143-2019-20-3-254-260","url":null,"abstract":"The proposed solution relates to fluidics and can be used, for example, in the extraction of oil and gas, the collection and preparation of oil, gas and water, the extraction of methane from methane beds, oil refining. The technical result is to increase the efficiency of a liquid-gas ejector by ensuring its work in the field of rational concentrations and salt composition, in which the intensification of energy exchange between the working fluid and the ejected gas is achieved. The essence of the proposed solution: the method of operation of a liquid-gas ejector involves injecting a working fluid with a power pump into the ejector nozzle, pumping gas with an ejector, creating, dispersing and increasing the pressure of a gas-liquid mixture with an ejector using aqueous solutions of salts as a working fluid. The values of the concentration and composition of salts in the working fluid are maintained within the range of rational concentrations and composition of salts, in which increased values of the efficiency of the ejector are achieved. Salts are added to the weakly mineralized aqueous solutions, and the highly mineralized aqueous solutions are diluted with fresh water. As the working fluid, the formation and/or incidentally produced waters of oil, gas, gas condensate and methane-coal deposits, which are aqueous solutions of salts, are used if the composition and concentration of salts in the produced and/or incidentally produced waters are within the range of rational concentrations and composition of salts in which provides an increase in the efficiency of the ejector. The boundaries of the field of rational concentrations and salt composition are preliminarily determined by laboratory bench studies.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49499868","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}
Pub Date : 2019-12-15DOI: 10.22363/2312-8143-2019-20-2-134-139
Yury V Belousov, Белоусов Юрий Вениаминович, Ivan A. Kleymuk, Клеймюк Иван Александрович, S. V. Strashnov, Страшнов Станислав Викторович
The main criterion for the performance of welds is the strength. The least durable are the corner joints used to perform various types of welded joints. In the literature, the methods of calculating the strength of welded joints with solid seams are considered in sufficient detail. Methods of calculation of connection interrupted sutures absent. In this case, the greatest difficulty is the calculation of connections using circular intermittent seams, which are often performed in welded drums and pulleys. They work on torsion. Therefore, the development of methods for calculating circular intermittent seams for torsion is quite important. Shear stresses in welds from torque are determined depending on the value of the polar moment of resistance of its dangerous section. When determining the polar moment of resistance of the dangerous section of a circular discontinuous seam, it was represented by a set of sections in the form of a sector of a circular ring. The method of calculation of the polar moment of resistance of the rotated dangerous section of a circular discontinuous weld, which takes into account the relative length of the weld areas and their number, is proposed, as well as the method of accurate and approximate calculation of shear stresses in the weld.
{"title":"Development of methodology for calculation of discontinuous circular welds in torsion","authors":"Yury V Belousov, Белоусов Юрий Вениаминович, Ivan A. Kleymuk, Клеймюк Иван Александрович, S. V. Strashnov, Страшнов Станислав Викторович","doi":"10.22363/2312-8143-2019-20-2-134-139","DOIUrl":"https://doi.org/10.22363/2312-8143-2019-20-2-134-139","url":null,"abstract":"The main criterion for the performance of welds is the strength. The least durable are the corner joints used to perform various types of welded joints. In the literature, the methods of calculating the strength of welded joints with solid seams are considered in sufficient detail. Methods of calculation of connection interrupted sutures absent. In this case, the greatest difficulty is the calculation of connections using circular intermittent seams, which are often performed in welded drums and pulleys. They work on torsion. Therefore, the development of methods for calculating circular intermittent seams for torsion is quite important. Shear stresses in welds from torque are determined depending on the value of the polar moment of resistance of its dangerous section. When determining the polar moment of resistance of the dangerous section of a circular discontinuous seam, it was represented by a set of sections in the form of a sector of a circular ring. The method of calculation of the polar moment of resistance of the rotated dangerous section of a circular discontinuous weld, which takes into account the relative length of the weld areas and their number, is proposed, as well as the method of accurate and approximate calculation of shear stresses in the weld.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41834367","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}
Pub Date : 2019-12-15DOI: 10.22363/2312-8143-2019-20-1-66-78
N. S. Kozov, D. Osorio, J. G. Osorio
Traditional measurement techniques “in situ” sometimes fail to magnify the spatial distribution of floods. For these cases, the remote sensors provide methodologies of very low economic cost and high reliability when mapping flooded areas and quantifying the damages. Due to the dynamic nature of these phenomena, it is necessary to use satellite images of high temporal resolution, however this type of images usually have a low spatial resolution. In relation to this problem, traditional classification techniques are not reliable enough for flood delineation and monitoring since they use “hard methods” of classification, where the coarse pixel is assigned a single type of coverage. On the other hand, “smoothed methods” have the ability to assign different kinds of coverage to the interior of the thick pixel. The present investigation makes the application of a sub-pixel analysis methodology (sub-pixel analysis - SA) for the monitoring of flooded areas. The improvement of the delimitation is achieved with the use of topographic attributes provided by a digital terrain model (DTM). The methodology was applied to the monitoring in the Great Depression Momposina, specifically to delineate the swamp of Zapatosa.
{"title":"Application of remote sensing for monitoring of flood areas","authors":"N. S. Kozov, D. Osorio, J. G. Osorio","doi":"10.22363/2312-8143-2019-20-1-66-78","DOIUrl":"https://doi.org/10.22363/2312-8143-2019-20-1-66-78","url":null,"abstract":"Traditional measurement techniques “in situ” sometimes fail to magnify the spatial distribution of floods. For these cases, the remote sensors provide methodologies of very low economic cost and high reliability when mapping flooded areas and quantifying the damages. Due to the dynamic nature of these phenomena, it is necessary to use satellite images of high temporal resolution, however this type of images usually have a low spatial resolution. In relation to this problem, traditional classification techniques are not reliable enough for flood delineation and monitoring since they use “hard methods” of classification, where the coarse pixel is assigned a single type of coverage. On the other hand, “smoothed methods” have the ability to assign different kinds of coverage to the interior of the thick pixel. The present investigation makes the application of a sub-pixel analysis methodology (sub-pixel analysis - SA) for the monitoring of flooded areas. The improvement of the delimitation is achieved with the use of topographic attributes provided by a digital terrain model (DTM). The methodology was applied to the monitoring in the Great Depression Momposina, specifically to delineate the swamp of Zapatosa.","PeriodicalId":53011,"journal":{"name":"RUDN Journal of Engineering Researches","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42447978","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}
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