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Университет | Образование | Наука | Внеучебная жизнь |
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Andrei V. Passar 1, Ph.D. in Technical Sciences, Senior Researcher of Numerical Methods of Mathematic Physics Laboratory, е-mail: passar_av@mail.ru
1Computational Centre of Far-East Branch of Russian Academy of Sciences (Khabarovsk)
The paper deals with the choice of the angle of gas flow outlet from the impeller of a centripetal turbine when it is operated as part of a compound engine. For this purpose, a new approach of design and calculation of the turbine operating as a part of a compound engine is proposed to use. There are presented impellers of the centripetal turbine, designed with different angles of flow output, as well as the turbine characteristics in stationary flow and at operating as a part of a compound engine. The analysis of turbine characteristics in stationary flow shows that a decreasing the angle of flow outlet from the impeller leads to an increasing the efficiency and effective power of the turbine. The analysis of the turbine characteristics as a part of the compound engine shows that a decreasing the angle of flow outlet from the impeller leads to increasing the efficiency of the pulse response and the effective power of the turbine. The comparison of the calculated pressure pulse with the experimental one, as well as the calculated turbine characteristic with the experimental one shows the adequacy of the applied method.
Keywords: efficiency of the turbine, the efficiency of the pulse response, the angle of flow output from the impeller, a new design method
References
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Igor P. Popov1, Senior Teacher of Mechanical Engineering Technology, Metal Cutting Machines and Tools Dpt., е-mail: ip.popow@yandex.ru
1Kurgan State University
The classical solution of problems associated with the calculation of the speeds and reactions of elements of complex mechanical systems with harmonic force effects, consists in the compilation and integration of systems of differential equations and is rather cumbersome and time consuming. In most cases, interest is limited to the steady state. The purpose of the research is to develop essentially compact methods for calculating systems for steady-state modes. Methods for calculating electrical circuits have being used for the problem solution. The representation of harmonic quantities in the form of rotating vectors in the complex plane and the operation with their complex amplitudes makes it possible to repeatedly simplify the calculation of arbitrarily complex mechanical systems with harmonic effects in the steady state. Vector diagrams of the amplitudes of forces, velocities and their components in the complex plane for the zero time instant are constructed.
Keywords: reactance, resistance, impedance, sasseptance, conductance, admittance
References
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Olga N. Grinyuk2, PhD. in Technical Sciences, Associate Professor, Associate Professor of Automation Production Processes Dpt., e-mail: olgrinyuk@mail.ru
Olga V. Aleksashina1, PhD. in Technical Sciences, Associate Professor, Associate Professor of Standardization, Metrology and Certification Dpt., e-mail: Svirukova@yandex.ru
Olga F. Vyacheslavova1, Doctor in Technical Sciences (habil.), Professor, Professor of Standardization, Metrology and Certification Dpt., e-mail: vyache-smis@mail.ru
Natalia V. Maslova2, PhD. in Technical Sciences, Associate Professor, Dean of Cybernetics Faculty, e-mail: nmaslova@nirhtu.ru
1Moscow Polytechnic University
2 Novomoskovsk Institute (branch) of D. Mendeleev University of Chemical Technology of Russia
In the article there are presented the classification of technological operations of production of steel products, a short description of the basic shearing, shaping and stamping assembly operations. The developed software package allows the user to design various stages of metal products manufacturing, such as efficiency of metal usage, shaping operations, bucking at an extract. Also it enables the calculations for bending operations and energy-power characteristics.
Keywords: production of metal products, technique of metal constructions manufacturing, software, quality control of metal structures, efficient use of metal, metal processing
References
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Elena A. Chekalova1, PhD. in Technical Sciences, Associate Professor, Professor of Mechanical Engineering Technology and Equipment Dpt., e-mail: alenka.2019@inbox.ru
Andrei V. Zhuravlev1, Engineer of Mechanical Engineering Technology and Equipment Dpt., e-mail: andrei-3x@mail.ru
1Moscow Polytechnic University
Comparative studies were carried out on the performance of regrind burnished taps from R6M5K5 high-speed steel followed by discrete diffusion hardening in comparison with regrind burned taps from R6M5K5 high-speed steel followed by application of burnishing. It has been established that the discrete oxidation technology allows to increase the productivity of a sophisticated cutting tool by 80–85 % compared to the burnishing technology.
Keywords: complex-profile tool, high-speed steels, oxidation, microstructure, productivity, wear resistance
References
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Irina N. Filonenko1, Senior Teacher of Production Automation and Information Technologies Dpt., e-mail: filonenkoin@mail.ru
Gleb A. Ulitskii1, 3d year student of Production Automation and Information Technologies Dpt., e-mail: gleb.ulitsky@yandex.ru
Nikita A. Shindyapkin1, 3d year student of Production Automation and Information Technologies Dpt., e-mail: hold.face@yandex.ru
1Kolomna Institute (branch) of Moscow Polytechnic University
Since the temperature range of operation limits the obtaining of high power in semiconductors, the use of heat sinks serves as a solution to this problem. The article is devoted to the analysis of the methodology for calculating the design parameters of the heat sinks of power semiconductors, automating their calculation, creating a database to search for analogues that correspond to the calculation and storage of the results of calculations. It was also realized the construction of the drawing of the cooler, which contains three of its projections and the creation of a 3D-model, based on the calculated geometric parameters. As a result, software was developed that fully meets the objectives. The development of the application was carried out in the Lazarus development environment, which in turn is a free software product that allows you to create cross-platform applications. Database development was conducted in MySQL DBMS, which is also a free software product and allows you to work under all modern operating systems. As a result, the developed product is also cross-platform.
Keywords: heat sink, natural cooling, power semiconductor, heat sink, transistor, calculation of overall and physical parameters, 2D-drawing, 3D-model, database, UML-diagram
References
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12. Belov V.V., Chistyakov V.I. Information Systems Design. M.: Academy, 2013. ˗ 353 p.
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