2015

Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/14624

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Зараз показуємо 1 - 20 з 1515

"1941–1945: фотоісторія у родинному альбомі"
(НТУ "ХПІ", 2015) Красіков, Михайло Михайлович
CFD modeling of kerosene combustion with various initial conditions and fuel droplet diameters
(НТУ "ХПИ", 2015) Hajivand, Masoud
This paper presents the numerical models for the analysis of combustor fuel spray, characteristics, in various injection conditions in a can type of combustor with a double stage radial swirler. Spray consists of two fundamental and consecutive steps, means the primary breakup and the secondary breakup. The primary breakup is modeled by Linearized Instability Sheet Atomization (LISA) which are mostly used in a pressure swirl atomizers. Secondary breakup is modeled by Taylor analogy breakup model (TAB). The trajectory and velocity of generated fuel droplets is determined by Lagrangian Particle Tracking. Characteristics of jet breakup, depends on a variety of factors such as turbulence, injection pressure drop, velocity profiles, nozzle geometry, and the physical state of the liquid fuel. In this paper Jet-A aviation fuel (kerosene), modeled as a two-component surrogate fuel (by mass 60 % C10H22 and 40 % C9H12). The standard k–ε model with the enhanced wall treatment and the Euler-Lagrange method were employed for the simulation of the turbulence and spray. All results of the simulation in this paper are analyzing in 3 various injection conditions and one of these cases was chosen and implemented in a real annular combustion chamber of a gas turbine. A PDF Flamelet model was employed to simulate combustion process.
Diversification of market for the ukrainian gas turbine building as a key factor of production stabilization in the modern context
(НТУ "ХПІ", 2015) Chernova, L. S.
The article presents the analysis and studying of prospective domestic and external markets for SE ―Zorya‖-―Mashproekt‖ GTR&PC’s products in relation to the current trends of gas turbine industry development in various directions. In addition to the existing markets, in which the products of the above enterprise are present, the prospective alternatives for penetration into the world markets are discussed, as well as participation in the domestic market with consideration for the required diversification not only for SE ―Zorya‖-―Mashproekt‖ GTR&PC, but also for the whole gas turbine industry of Ukraine.
The effect of cutting temperature on hole quality when drilling CFRP/metal stack
(НТУ "ХПІ", 2015) Kolesnyk, V.; Zajac, J.; Radchenko, S.; Adamian, M.
The carbon fiber reinforced plastic (CFRP) are widely used in stacks with metals. That allows obtaining components with high strength and reduces weight. Holes’ drilling is a basic operation of CFRP/metal and metal/CFRP stacks machining. The most common problems of CFRP/metal stacks drilling are CFRP delamination, fiber pull – out, thermal degradation and low quality of hole surface. In this study the effect of cut ting temperature on the hole quality was provided. It was experimentally established that drilling of CFRP/metal stack was accompanied with a significant change of cutting temperature in the cutting zone during the transition of drill from CFRP to metal plate.
Intelligent information technology building systems diagnostics using nuclear moments Volterra
(НТУ "ХПІ", 2015) Pavlenko, V. D.; Fomin, O. O.
The paper presents the intelligent information technology to increase the efficiency of diagnosing the state of nonlinear dynamical objects of different physical nature with the use of mathematical models in the form of Volterra kernels. Research results on the test object monitoring show that moments of nuclei Volterra 2nd order characterized by the highest stability of the quality of diagnosis (probability of correct recognition) errors in measuring the response of objects of control compared to the data of their classification on the basis of samples of nuclei with a given increment.
Involute spiral face couplings and gears: design approach and manufacturing technique
(НТУ "ХПІ", 2015) Kapelevich, Alexander L.; Korosec, Stephen D.
This paper presents spiral face gears with an involute tooth line and an identical tooth profile in the normal section at any radius. There are two main applications for such face gears. One of them is an alternative solution with certain advantages in performance and fabrication technology to the straight tooth, Hirth, or Curvic flange couplings. Another application is when a face gear is engaged with an involute helical pinion or worm at intersecting or crossed axes. Potential advantages of spiral face couplings and gears include high power transmission density and highly productive machining of face spiral gears. The paper describes gear geometry analysis, and design technique of spiral face involute gears with symmetric and asymmetric tooth profiles. It also explains a hobbing method of these gears and tool design specifics, and then illustrates gear and tool design with numerical examples.
Learning of neural nets with bithreshold-like activation function
(НТУ "ХПІ", 2015) Kotsovsky, V.
The paper is devoted to the study of the properties of the simplest multithreshold generalization of McCulloch-Pitts neurons, namely bithreshold neurons. The main reason of application of multithreshold device is their more powerful capabilities in comparison with classical threshold units. But multithreshold devices are quite unused because the effective learning algorithm is unknown for such units. It is possible to mark out three main goals of the present paper. The first one is the study of the existence of effective learning technique for bithreshold neurons and networks. The second one is the analysis of the relation between Boolean function realizable on bithreshold units and decision lists. The last goal is the study of capabilities of feedforward neural networks with smoothed bithreshold activation function and closely related question of their learning by means of backpropagation.
Management of development program for international companies’ in turbulence environment
(НТУ "ХПИ", 2015) Bushuyev, S.; Minayeva, T.
Theoretical aspects and elements of the methodology for modeling business environment international company based on the value-added chain (value) for interested parties should take into account the socio-economic, infrastructural and market components. We investigate the construction of such a business strategy of the international company that provides commercial, economic, fiscal and social efficiency of its activities on the basis of the selection of activities that bring the highest added value.
Meaning and formation technology thinking
(НТУ "ХПІ", 2015) Dolska, Olga
The author reflects on the techniques of thinking. Cultural sences have influenced their forming. The sense represented as a method of organization of the world. With sense a man understands a world clearly: makes the world intelligible with the help of the sense. The author considers techniques of thinking, proposed by K. Jaspers. It is underlined that today it is "dangerous" to operate with "absolute senses". An author specifies that all conditions for forming of a new technique of thinking were created today. As an argument an author refers to the nomadic way of G. Deleuze and F. Guattari. The new technique differs from non-linearity in the production of senses; it is turned to the polysemy of the sign. An author gives the general characteristics of nonlinear thinking.
Methods and tools for dynamic requirements catalog management in agile software development
(НТУ "ХПИ", 2015) Tkachuk, M. V.; Gamzaev, R. A.; Martinkus, I. O.; Ianushkevych, S. D.
A method for managing dynamic requirements catalog in agile software development, especially on example of Scrum-methodology is proposed. Popular approaches to solving this problem are reviewed. The proposed approach is based on the combined usage of the latent semantic analysis and analytical hierarchy process, it allows to evaluate the given textual software specification with respect to their possible redundancy and possible logical conflicts. Besides that this approach supports the decision making procedure to prioritize the requirements taking into account their functionality importance for target software product. The effectiveness of the proposed method was tested on the test case.
Methods for design of axial turbines for ORC cogeneration unit working with MDM
(НТУ "ХПИ", 2015) Rusanov, R.; Klonowicz, P.; Rusanov, A.; Lampart, P.; Jędrzejewski, L.; Witanowski, L.
The paper describes two methods for the design of blading systems of axial turbines for an Organic Rankine Cycle (ORC) cogeneration unit working with silica oil MDM. The algorithms are based on mathematical models of various levels of complexity – from 1D to 3D. Geometry of flow parts is described with the help of analytical methods of profiling using a limited number of parameters. The 3D turbulent flow model is realised in the software complex IPMFlow, which is developed based on the earlier codes FlowER and FlowERU, or in software complex ANSYS. Examples of developed turbines for a 500 kW machine are presented.
Methods for design of radial-axial turbines for ORC cogeneration unit working with MDM
(НТУ "ХПИ", 2015) Klonowicz, P.; Rusanov, R.; Rusanov, A.; Lampart, P.; Suchocki, T. K.; Surwilo, J.
The paper describes two methods of design of blading systems of radial-axial turbines for an Organic Rankine Cycle (ORC) cogeneration unit working with silica oil MDM. Preliminary design of the turbine flow part draws on methods of 1D calculation and pre-selection of basic geometric characteristics. Final design involves also methods for construction of 3D geometry and methods of 3D flow calculations of the turbine flow part. 3D numerical calculations of turbine flows are made with the help of the software package IPMFlow, developed based on the earlier codes FlowER and FlowER-U, or using the software complex ANSYS. 100 kW ORC turbine designs with the single-stage radial-axial turbine are elaborated in this paper.
Perspectives of Ukrainian-Polish economic cooperation
(НТУ "ХПІ", 2015) Shevchenko, Maryna Mykolaivna; Klepikova, S. V.
Discusses the results of the studies of external economic relations of Ukraine and Poland in the years 2003-2015. Offers recommendations for the development of bilateral economic relations at the state level, regions and enterprises.
SaaS-модель – инновационное техническое решение для автоматизации маркетинга
(НТУ "ХПИ", 2015) Гурская, Ирина Дмитриевна; Китченко, Елена Николаевна
Раскрывается содержание системы CRM (Customer Relationship Management – системы управления взаимоотношениями с клиентами) и выявляются её цели. Анализируется применение модели SaaS (Softwareas a Service – программное обеспечение как услуга) в целях автоматизации маркетинга. Рассматриваются достоинства и критика SaaS-модели в действии. Сделаны выводы о перспективах внедрения данной системы в бизнес и перспективах её развития.
Saving disassembly at heavy-duty gas turbine compressor reengineering
(НТУ "ХПІ", 2015) Konoplyanchenko, E.; Kolodnenko, V.; Atalawei, W.
In a paper the considered questions of a machine industry hard loaded responsible products resource saving at a stage of their repair, on an example of the heavy-duty gas-turbine compressors. The main causes of failure and include the results of turbo systems. The modern concept of the rational search path to the failed element of sophisticated equipment. The technique of safe disassembly of their element base in view of maintenance specificity co nditions of and residual influence on an environment is stated. Practical application of the offered approach will allow to increase quality and safety of special assignment, and introduction of the formalized technique in conditions of real manufacture will allow increase in level of efficiency and the use of available means of complex technological equipment.
Selection evidence-based methods for effective use of alternative energy
(НТУ "ХПИ", 2015) Bukhkalo, S. I.; Olkhovska, Oksana Igorivna
This article discusses the possibility of the development of science-based concept of integrated processes complex enterprises energy mix (alternative energy and polymer wastes). A review of the literature and the necessary articles written on the subject: as technologies and economies develop and become more complex, energy needs increase greatly; types and methods of alternative energy, as well as the possibility of calculating the basic set of main economic indicators are classified; identified possible areas of work in obtaining the necessary information and results. The results of studies of complex innovative projects conducted as inter-university cooperation. The features of the main projects participating EU Energy Week (environmental safety and scientifically grounded processes). Recognized as the most effective direction of resources and energy saving.
A Unity 3D engine plugin for creating static ecosystem in game environments
(НТУ "ХПИ", 2015) Bezmenov, M. I.; Potapenko, Y. O.; Dvornik, K. O.
Here we report on the researches and development of the static ecosystem plugin to Unity 3D game development platform, also the creation of neural network has been described. It allows for the designer-driven automatic generation of computer game assets based on the two vastly different approaches: procedural and artificial-neural-network-based; with user-defined object to be cloned, area to be populated and placement rules. Both methods have been applied to the problem of photorealistic distribution of stones on the hillside (including demonstration of the common placements mistakes). All the approaches were then evaluated by the panel of the computer gamers. Opinion of some participants of the experiment with the corresponding results were summarized.
Use of Engines Manufactured by SE "Zorya"-"Mashproekt" GTR&PC for Renovation of the Gas Transportation System of "Ukrtransgaz" PJSC
(НТУ "ХПИ", 2015) Chernova, L. S.
The article observes potential participation of SE "Zorya"―"Mashproekt" GTR&PC in implementation of the program for renovation of Ukraine’s gas transportation system facilities. The mentioned state enterprise, as an originator of the method of compressor stations renovation by means of a heavy upgrading of gas pumping units, has a long experience of successful implementation of tens of such projects in the Russian Federation, Ukraine, Bulgaria. The examples and propositions for modernization of gas pipe-lines of "Ukrtransgaz" PJSC gas transportation sys-tem are set forth in the article.
Value creation in the international supply chains by means of information communication technology
(НТУ "ХПИ", 2015) Zubkova, Alina Boleslavivna; Shvets, Mariia Anatoliyvna
The definition of value creation is given and centers of value creation in the supply chain are identified. High-technology environment has influenced on companies’ performance. Efficiency of using information communication technology increases possibility to satisfy stakeholders with their needs. It is concluded with the centers of value creation in the supply chain where stakeholders’ participation plays a key role.
Web-application for archiving of creep and long term strength data
(НТУ "ХПИ", 2015) Breslavsky, D. V.; Breslavska, O. O.; Khoroshun, A. S.
The paper is devoted to description of the software, which made as web-application, for collection, storing and processing the data of creep and long term strength, including the case of creep-fatigue interaction. The short review and analysis of problem is presented. The technology for minimization of creep data storing as well as the architecture of web-application is discussed. Software contains the possibility of imaging three parts of data, which are creep curves, long term strength curves and diagrams of limiting amplitudes and stresses. The values of temperature, stress, grade and literature reference to the data are demanded database fields. The examples of the work with database and with plots are presented.