Mechanics and Advanced Technologies

Постійне посилання на фонд

https://ela.kpi.ua/handle/123456789/33005

ISSN 2522-4255 (Online), ISSN 2521-1943 (Print) Періодичність: 3 рази на рік
Рік заснування: 1964
Тематика: Метою міжнародного науково-технічного журналу «Mechanics and Advanced Technologies» є ознайомлення науковців усього світу з новітніми досягненнями в галузі машинобудування, результатами наукових досліджень та вдосконаленими методами розрахунку і проектування елементів машинобудівних конструкцій.
Попередня назва: Міжнародний науково-технічний журнал «Mechanics and Advanced Technologies» є правонаступником збірника “Вісник національного технічного університету України "Київський політехнічний інститут". Серія машинобудування”, який припинив своє існування.
Офіційний сайт: https://journal.mmi.kpi.ua/

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Зараз показуємо 1 - 20 з 348

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Accuracy control of contour milling on CNC machines
(Igor Sikorsky Kyiv Polytechnic Institute, 2018) Petrakov, Y.; Shuplietsov, D.
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Adaptation of corporate model of Ukrainian aircraft product life cycle to the international methodology of systems engineering
(Igor Sikorsky Kyiv Polytechnic Institute, 2023) Kryvova, S.; Zvorykin, C.; Trubachev, S.
Problems. Under the present-day conditions, the preservation of competences of Ukrainian aircraft construction enterprises will be determined by the possibility of enterprises attracting to participation in international cooperation programs and projects. But this is possible only on the condition of prior harmonization of the product development methodology adopted in Ukrainian aircraft construction to that used in the international aircraft construction projects. Purose. The main goal of this article is to determine the ability and ways of adapting the corporate model of life cycle of aircraft engineering projects by Ukrainian aircraft construction enterprises to modern global aircraft construction practices. Implementation methodology. The research methodology predicted the identification of the main modern trends in the field of system engineering for the creation of a science-intensive product, as well as the analysis of concepts of presenting the life cycle of complex technical systems in international regulatory documents, industry regulations, guidelines and other information sources. Criteria for perspective of using the identified informational and normative sources as close analogues for the development of one’s own corporate model of life cycle of an aircraft construction product were identified. On the basis of the criterion analysis of researched concepts of the life cycle of complex technical systems representing, the requirements were formed, which formed the basis of the concept of one’s own corporate model of life cycle of the aircraft construction product. The results. The result of conducted research was the proposed concept of a corporate model of the life cycle of an aircraft construction product manufactured in Ukraine, which takes into account the international experience and best practices of leading aircraft construction companies, including focusing on the experience accumulated by domestic aircraft manufacturers. Conclusions. According to the results of analysis of advanced world practices in the field of creating a science-intensive product, an own corporate model of the life cycle of an aircraft product manufactured in Ukraine was proposed. In the future, on the basis of this model, a system for creating an aircraft product can be built and developed, which will be harmonized with existing world practices and will allow the domestic aircraft construction enterprises to fight for participation in international programs and projects.
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Analysis of spray particles entrance of Right-angle cold spray nozzle based on CFD
(Igor Sikorsky Kyiv Polytechnic Institute, 2023) Tan Kun
Cold spray technology is a solid-state deposition technology, and the nozzle is an important part of the cold spray system. This article proposes a right-angle nozzle. The characteristic of this nozzle is that it can change the flow direction of the gas flow inside the nozzle to realize spraying on the surface of special parts; the acceleration of particles by the right-angle nozzle with different particle entrances is studied. The results show that the outlet center velocity of the right-angle nozzle with a circular throat section is greater, the viscous boundary layer effect is better, and the effective circulation area is larger; the maximum airflow velocity near the outlet of the right-angle nozzle at the particle entrance A is 663.4m/s; it can also effectively avoid the deposition of particles inside the right-angle nozzle, thereby reducing the loss of kinetic energy during the acceleration of particles in the right-angle nozzle; the research on the structure of the new right-angle cold spray nozzle can provide reference for the nozzle of cold spray technology Opinion.
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Analysis of the forces acting from the side of the magneto-abrasive tool on parts being machined during magneto-abrasive machining in conditions of the annular bath with large working gaps
(Igor Sikorsky Kyiv Polytechnic Institute, 2023) Maiboroda, V.S.; Dzhulii, D.Yu.; Zastavskyi, K.O.
Background. For effective magneto-abrasive machining (MAM) of complex-shaped parts, comprehensive information is needed on the processes that occur when the magneto-abrasive tool (MAT) contacts with the surfaces being machined. Effective magneto-abrasive machining occurs in the presence of sufficient values of the normal and tangential components of the interaction forces between the MAT and the machined surfaces and the powder mixing during machining. Previously carried out analytical studies of dynamic parameters did not take into account the real conditions of the interaction of grains and their groups with machined surfaces.
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Analysis of the influence parameters on steel strip defects in continuous roll casting-rolling
(Igor Sikorsky Kyiv Polytechnic Institute, 2023) Nogovitsyn, O. V.; Kholiavik, O. V.; Boris, R. S.; Sokhan, D. V.; Seminska, N. V.
Problems. The casting-rolling process is currently one of the most effective and promising processes used for the production of steel sheets. The advantages of this process include the small dimensions of the unit and a significant reduction in energy resources. This occurs due to a combination of technological operations and absence of the intermediate heating of the metal. At the same time, there is the challenge of a sustainable industrial process for producing high quality steel sheets. Objective. Companies developing direct melt strip processes using twin-roll crystallizers report a number of challenges they face. Among such problems are defects on the surface of the cast strip. Currently, there is no generally accepted classification of surface defects, such as surface cracks, wrinkles, namely, depressions, and transverse deformation bands. At the moment, there is also no justification for the reasons for the appearance of surface defects during the rolling process. Methods. Based on the research results, a hypothesis was proposed about the causes of defects on the surface of the cast strip and ways to prevent them. During the operation of two-roll crystallizers, a combination of metal hardening processes and its subsequent plastic deformation occurs. The metal moves sequentially through areas of crystallization and deformation. During the research, the authors calculated the process of roll casting-rolling. Conclusions. Based on the research results, we believe that when casting steel using twin-roll casting-rolling, it is necessary to reduce the compression to a minimum value. This recommendation will ensure welding of defects on the surface. The use of this proposal will allow the casting process to be carried out at high speed and little force to be applied to squeeze the rolls. We propose to carry out the process of forming a cast strip with the necessary quality parameters at the following stages of rolling.
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Application of Avinit vacuum plasma technologies Avinit to the manufacture of high-precision full-size gears
(Igor Sikorsky Kyiv Polytechnic Institute, 2021) Sagalovych, A.; Popov, V.; Sagalovych, V.; Dudnik, S.; Edinovych, A.
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Application of chemography for evaluating the workability of hard alloy cutting plates
(Igor Sikorsky Kyiv Polytechnic Institute, 2020) Salenko, Аleхandеr; Elizarov, Mykhailo; Shchetinin, Viktor; Tarek, M. A. Al-Kuraan; Klymenko, Sergiy
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Application of CVD coatings on the inner surfaces of cooled GTE blades
(Igor Sikorsky Kyiv Polytechnic Institute, 2024) Sagalovych, O. V.; Popov, V. V.; Sagalovych, V. V.
Вивчена можливість нанесення Мо і Cr покриттів CVD-методом на внутрішні поверхні трубчастих виробів Ø ˂ 60 мм. Розроблений процес нанесення Мо і Cr покриттів методом газофазного осадження. Визначено області параметрів отримання покриттів з рівномірною структурою, швидкістю, твердістю, а також закономір- ності зміни цих характеристик при зміні основних параметрів процесу отримання таких покриттів. Відпрацьовані технологічні процеси нанесення металевих Мо і Cr CVD покриттів можуть бути базою для розробки дослідних технологій нанесення функціональних покриттів на прецизійні деталі з внутрішніми трубчастими поверхнями малого діаметру в машинобудуванні та авіаційної промисловості. Розроблено контрольований процес нанесення двокомпонентних хром-алюмінієвих покриттів методом газофазного осадження з використанням органічних та металорганічних речовин. Проведено оптимізацію процесів нанесення якісних двокомпонентних хром-алюмінієвих покриттів на дослідних макетних зразках внутрішніх порожнин охолоджуємих робочих лопаток турбін. Проведені дослідження виявляють характеристики двокомпонентних хром-алюмінієвих покриттів, співставні з характерис- тиками покриттів, які використовують у виробництві, при цьому забезпечується хороша якість покриттів у відношенні міц- ності зчеплення з матеріалом турбінної лопатки. Відтворюваність одержаних покриттів дозволяє у перспективі відпрацьову- вати дослідні технології для виробництва. Менша токсичність використовуємих прекурсорів дозволяє створити екологічно безпечну технологію і суттєво зменшити еко- логічні проблеми у виробництві при нанесенні двокомпонентних хром-алюмінієвих покриттів на внутрішні порожнини охоло- джуємих робочих лопаток турбін.
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Application of digital photography in biomechanical studies of osteosynthesis systems
(Igor Sikorsky Kyiv Polytechnic Institute, 2018) Shidlovskiy, M. S.; Zakhovajko, O. P.; Dyman, M. M.
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Application of exponential functions in weighted residuals method in structural mechanics. Part 1: axisymmetrical shell problem
(Igor Sikorsky Kyiv Polytechnic Institute, 2020) Orynyak, I. V.; Bai, Yu. P.
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Application of exponential functions in weighted residuals method in structural mechanics. Part 3: infinite cylindrical shell under concentrated force
(Igor Sikorsky Kyiv Polytechnic Institute, 2021) Orynyak, I. V.; Bai, Yu. P.; Hryhorenko, A. V.
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Application of exponential functions in weighted residuals method in structural mechanics. Part II: static and vibration analysis of rectangular plate
(Igor Sikorsky Kyiv Polytechnic Institute, 2021) Orynyak, I. V.; Bai, Yu. P.
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Applications of randomly selected sets of exact Voight’s solutions for vibration of thin plates
(Igor Sikorsky Kyiv Polytechnic Institute, 2022) Orynyak, I.V.; Bai, Yu.P.; Kostiushko, I.A.
The principally new method of selected exact solutions, SES, for plate vibration based on fundamental solutions of Voigt is suggested. In contrast to similar known methods, it employs the frequency dependent functions for both space coordinates. The sets of exact solutions which depends on some arbitrary chosen parameters are constructed. This allows to choose any number of exact solutions, while the required number of them depends on the boundary conditions which should satisfy in considered collocation points. The efficiency of method is demonstrated for the most unfavorable case of all sides clamped rectangular plate. Nevertheless, the accuracy is quite satisfactory for first six natural frequencies even for relatively small number of collocation boundary points, and testify about big prospects as to application for complex structures, different geometries, various boundary conditions. Additionally two variants of the Galerkin method are realized and compared. First one, employs the exponential functions, while the second one – the very popular beam functions. The calculation results show the superiority of first variant as in technical realization as in accuracy, and in further applications in structural mechanics.
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Assignment of the cutting mode when boring holes on CNC machine
(Igor Sikorsky Kyiv Polytechnic Institute, 2023) Petrakov, Y. V.; Danylchenko, M. А.
Abstract. Due to structural limitations, the processes of boring holes are performed in a low-rigidity machining system, which predetermines their susceptibility to vibrations. The article is devoted to the study of the process of boring holes on CNC machines, and the subject of the study is the effect of the cutting mode on the stability of the machining. The mathematical model of the machining system is presented in the form of a two-mass dynamic system, which forms a closed loop structure with negative feedback by elastic displacement. In addition, positive feedback is taken into account through the delay argument function, which represents machining along traces. It has been proven that this process provokes the emergence of regenerative oscillations in the machining system. The application of the system’s approach made it possible to obtain a mathematical model in the form of state variables, which is acceptable for the use of numerical modeling methods in both time and frequency space. An applied engineering program for determining the stability diagram in “cutting depth - spindle speed” coordinates has been created. The program uses a new criterion of stability of systems closed through positive feedback loop with a delay argument function. For the first time, the validity of such a criterion was proved for systems described by differential equations of the fourth order. The importance of taking into account the results of the study in the form of a stability lobes diagram when assigning a cutting mode, especially in the area of high speeds, is proven. Thus, according to the results of the experiments, a change in speed of only 7% from 2150 rpm to 2320 rpm with the same cutting depth of 0.4 mm allows the process to become stable. The use of the created program is possible in the system of automatic control of the online cutting mode when the machine is equipped with vibration sensors with appropriate systems for identifying the dynamic parameters of the machining system, which will significantly increase the machining efficiency.
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Characteristics of throttles in hydraulic shock absorber considering temperature changes of fluid
(Igor Sikorsky Kyiv Polytechnic Institute, 2017) Nochnichenko, I. V.; Uzunov, O. V.
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Chatter suppression technologies for metal cutting
(Igor Sikorsky Kyiv Polytechnic Institute, 2019) Petrakov, Y. V.
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Comparative evaluation of wear resistance surfacing with feeding of nanooxides and nanocarbides to weld pool
(Igor Sikorsky Kyiv Polytechnic Institute, 2020) Kuznetsov, V. D.; Stepanov, D. V.
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Comprehensive analysis of arc methods of 3D printing of metal products: assessment of the efficiency and prospects of using TIG as a heat source
(Igor Sikorsky Kyiv Polytechnic Institute, 2024) Horbenko, A.; Zvorykin, C.
В останні роки адитивні технології стають все більш важливими для виробництва деталей зі складною геометрією, що дозволяє швидко та ефективно створювати об’єкти з різними формами та конфігураціями в промислових секторах, таких як медицина, авіакосмічна промисловість та будівництво. У центрі уваги дослідження був аналіз дугових процесів для адитив- ного виробництва, зокрема шляхом зварювання неплавким електродом у середовищі інертного газу (TIG) та його застосування як джерела тепла. Сучасні методи 3D друку металевих виробів, такі як SLM (Selective Laser Melting), EBM (Electron Beam Melting), LMD (Laser Metal Deposition), дозволяють виготовляти деталі з хорошими показниками якості: точністю, шорсткістю поверхні, механіч- ними властивостями, та ін. Однак ці методи є дорогими через технологічну складність обладнання, а недоліком цих методів є їх низька продуктивність порівняно з дуговими. Результати, наведені в цій статті, показують, що продуктивність дугових методів в адитивному виробництві в кілька разів вища, ніж у SLM, EBM і LMD, а дугові методи є більш економічно ефективними завдяки меншій вартості обладнання та мен- шому споживанню енергії. У статті наведено схеми дугових методів адитивного виробництва. Один із перспективних напря- мків розвитку – гібридні технології, а саме використання джерела тепла TIG для спікання металевих порошків, пропонує ефе- ктивний спосіб здешевлення адитивного виробництва шляхом заміни лазера як джерела тепла, дозволяючи при цьому продов- жувати використовувати різні види металевих порошків, армуючих матеріалів та металокерамічних сумішей.
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Control of grinding polygonal surfaces
(Igor Sikorsky Kyiv Polytechnic Institute, 2017) Petrakov, Y.
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Creation of sealed strong structures of rocket and space equipment FDM printing methods by ULTEM ™ 9085 PEI plastic
(Igor Sikorsky Kyiv Polytechnic Institute, 2021) Salenko, A.F.; Derevianko, I.I.; Samusenko, A.A.; Avramov, K.V.; Lithot, A.V.; Rogulin, V.V.
The work shows the possibility of manufacturing products for rocket and space technology using the additive FDM-printing technology. The object of research is the nozzle plugs of the “membrane” type. Considering the specific-strength properties of the product during its operation during operation, as well as the features of the FDM-process, the design was optimized, the regularities of the formation of its properties were established. An impregnation technology has been developed to seal the product. The equipment was designed, and pneumatic tests were carried out. The properties of materials were investigated considering their guaranteed shelf life for 12 years of operation under accelerated climatic tests. It is shown that the production of products by FDM-printing methods is promising and expedient, since the properties being formed are predictable, achievable, and stable.

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