ПОЛУЧЕНИЕ ВЫЖИГАЕМЫХ МОДЕЛЕЙ МЕТОДОМ 3D-ПРИНТИНГА ДЛЯ ОТЛИВОК ГАЗОТУРБИННЫХ ДВИГАТЕЛЕЙ (original) (raw)
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РОЗРОБКА 3D-МОДЕЛІ ЗООМОРФНОГО МОБІЛЬНОГО РОБОТА ДЛЯ ВЕРТИКАЛЬНИХ ПЕРЕМІЩЕНЬ ПО МЕТАЛЕВИМ ПОВЕРХНЯМ
Nauka ì tehnìka sʹogodnì, 2022
The introduction of the new production concept of Industry 4.0 expands the possibilities of implementing advanced technologies such as mobile robots, artificial intelligence, cloud computing, etc. All this, together, allows us to implement new bold approaches to solving new promising challenges. One of the advanced technologies in the Industry 4.0 concept is mobile robotics. Research in this area is conducted by: Festo, Boston Dynamics, Kuka AG, ABB Robotics and many other leading companies. Analyzing the developments of these companies, we can see that there are specialized mobile works designed to solve specific, complex problems. Their solution is impossible without the development of new designs, control systems and the movement of mobile robots. Analyzing the publications, it was found that currently not enough attention is paid to the development of mobile robots for monitoring and control of load-bearing metal trusses of beam bridges. The peculiarity of this task is the need to implement not only the vertical method of movement, but also to ensure movement in the inverted form. In this case, the mobile robot must have the following characteristics: be able to move across the intersections of the ruptures of load-bearing structures, have a system of computer vision and a system of analysis of the working area. Based on the stated characteristics, the authors developed a block diagram based on the ESP32-CAM microcontroller, the selected hardware modules are necessary and sufficient to solve the problem. 3D-models of separate details are developed and the design of the mobile robot of vertical movement in CAD SolidWork 2020 is made. The obtained model became the basis for 3D-printing of the experimental model of the mobile robot of vertical movement on metal trusses of the beam bridge. Also in the work, the authors developed a scheme for connecting all control modules and power of the mobile robot in the PCB Altium Designer 20.2. According to the authors, the designed mobile robot for monitoring the control of loadbearing metal trusses of the beam bridge will speed up and optimize the process of finding and eliminating defects due to flexibility in the movement and application of modern control technologies based on IoT.
Aerospace technic and technology
The problem of numerical simulation of the gas flow with the combustion of atomized liquid fuel was solved (the equilibrium combustion model pdf was used along with the partially mixed mixture model) in the annular combustion chamber of a gas turbine engine. Numerical modeling was performed in Ansys Fluent calculation complex. The purpose of the calculations was to simulate the radial and circumferential unevenness of the gas temperature pattern at the outlet of the combustion chamber. As a result of the calculations, it was found that the accuracy of modeling the radial and circumferential unevenness of the gas temperature pattern at the outlet of the combustion chamber is unsatisfactory when using the k–e turbulence model with the initial settings for the Ansys Fluent calculation complex. Moreover, the maximum value of the radial non-uniformity of the gas temperature pattern at the outlet of the combustion chamber exceeded the value obtained in the experiment by 12.61 %, and the m...
МАТМОДЕЛЬ ГАЗОВОГО ДВИГАТЕЛЯ, ИСПОЛЬЗУЕМОГО В КАЧЕСТВЕ ПРИВОДА МОБИЛЬНОГО ТРАНСПОРТНОГО СРЕДСТВА
2018
The linear differential equation of the internal combustion engine (ICE) itself, by means of which it is possible to investigate the dynamic characteristics (transients) and throttle response of the new generation of gas engines, used as a drive for mobile vehicles, is given. At present, the need has arisen to create a new generation of ICS control systems that would combine the principles of robust and adaptive management and provide a specified quality of management in the conditions of structural or parametric uncertainty of the control facility itself, uncertainty of external conditions and management goal uncertainty. The most important contour in the engine control system is the crankshaft speed regulator. It has a determining effect on the technical, economic and environmental performance of ICE. The resulting differential equation describes the transient processes of the angular velocity variation of the crankshaft of the gas engine of vehicles in a wide range of speed and load modes of operation.
Aerospace technic and technology, 2020
Mathematical models are efficient instrument of engines and their automatic control systems designing. The main areas of the models application are simulation modeling of the controlled object at analysis, synthesis and semi-natural simulation, and also model-based engine controlling algorithms designing. In this case, a set of mathematical models is used that is derived from the initial (base) thermo-gas-dynamic model of working process, which is usually designed and supported by the engine designer. However, it not satisfies the requirement of real-time calculations when the model simulates the engine dynamics at operation with the real electronic hardware. Lacking of the above-listed shortcomings dynamic model of the engine is formed as a combination of simplified static and dynamic models. In this case, the dynamic model has a linear structure and characterizes dynamic relations in a local area close to the engine static characteristics that is represented as the static model. T...
ИЗРАБОТВАНЕ И ИЗГАРЯНЕ НА МОДЕЛИ ЗА ЛЕЕНЕ ПО СТОПЯЕМИ МОДЕЛИ ОТ PLA ЧРЕЗ REPRAP 3D ПРИНТЕР
Катедра Информатика 1 и Катедра Материалознание и технология на материалите 2 , Русенски Университет (РУ) " А.Кънчев " eminev@uni-ruse.bg Резюме: Показана е възможността за изграждане на технологична верига за бързо производство на метални отливки с помощта на стопяеми/изпаряеми модели отPLA Последните се получават с помощта на машина за бързо прототипиране Velleman K8200. Тази технология носи общото име RepRap, като цената на такъв принтер, работещ на принципа на FDM е 10-25 пъти по-ниска, което я прави подходяща за целите на настоящия проект. Направено е изследване на възможността на материала PLA за изгаряне, което показва, че най-подходящата температура на изгаряне e 500 о С, при която се получават количества остатъчни пепели (под 0.8%). Тези количества не се променят съществено при допълнително повишаване на температурата. Данните са получени при време на задържане – 1 час.
Aerospace technic and technology, 2020
This study aims to develop of the bird-impactor model for mathematical modeling of turbofan engine parts damage processes in case of a bird ingestion into the its air-gas channel. The bird-impactor model was justified for simulation of bird with mass of 0,70…3,65 kg for certification requirements on aircraft engines according to aviation regulations CS-E, FAR-33, AP-33. It was implemented in numerical SPH model for explicit LS-DYNA Solver of ANSYS LS-DYNA software package. The pre - and postprocessor LS-PrePost program also was used for numerical SPH model generating, preparing input data and processing the results from calculations. The bird-impactor model was had a hemispherical-ended cylinder geometry form. Material of the bird-impactor model was defined as a mixture of water (90-percent of volume) and air (10-percent of volume). The Null material model with low strength and the linear polynomial equation of state were used for the bird modeling. It was considered impacts bird to...
2019
The article explores the possibility of using waste dumps of OJSC Group Magnezit enterprisein Satka for production of magnesium concrete. The fractional and mineralogical composition ofthis type of waste has been established. Fractions suitable for use as coarse and fine aggregate havebeen grouped. The possibility of using fractions, which are not included in the category of aggregatesas a raw material for obtaining a magnesia binder by the combined method, has beenidentified. A hypothesis has been put forward on the principle of the best joint work of the hydrationproducts of magnesia binder and magnesium-containing aggregates in the composition of a concretemixture due to the similar mineralogy of these components.Исследуется возможность использования отходных отвалов комбината ОАО «Группа Магнезит» г. Сатка для производства тяжелого магнезиального бетона. Установлен фракционный и минералогический состав данного вида отходов, выделены и сгруппированы фракции, пригодные для использ...
Aerospace technic and technology, 2019
Gas Turbine Engine (GTE) operating characteristics such as thrust (or power), specific fuel consumption and other cycle parameters on different regimes, can be determined by engine modeling and applying correspondent calculation method. Its accuracy is the function of the engine’s element maps definition precision. So these maps representations influence for engines investigation results significantly. Main points and equation system for engine performances calculation method were represented in Part I of this article. The method gives an opportunity for the flow path thermodynamical parameters and engine integral values analyzing by using multistage axial blade machines blade-to-blade descriptions. The compressor and gas turbine and parameters are getting by special program modules, adding to the engine operating characteristics investigation program complex. These modules use the flow path and cascade middle radius geometrical parameters as the data for calculation. The goal of th...
2017
У статтi висвiтлено особливостi становлення ембрiотопографiї шлуночкiв головного мозку у зародковому перiодi онтогенезу людини. Показано доцiльнiсть та переваги використання методу тривимiрного комп’ютерного реконструювання при вивченнi шлуночкової системи головного мозку на раннiх стадiях пренатального перiоду онтогенезу людини. Встановлено, що формоутворення бiчних шлуночкiв вiдбувається пiд безпосереднiм впливом розвитку самих пiвкуль та диференцiюванням їх внутрiшнiх структур. У зародкiв 6,5-8,0 мм тiм’яно-куприкової довжини (ТКД) внаслiдок потовщення бiчних стiнок промiжного мозку порожнина III шлуночка має келихоподiбну форму, у зародкiв 9,0-10,0 мм ТКД III шлуночку притаманна елiпсоподiбна форма, а наприкiнцi 6-го тижня ембрiогенезу (зародки 11,0-13,0 мм ТКД) його порожнина звужується i поступово набуває ромбоподiбної форми. IV шлуночку головного мозку властива цилiндрична форма. Наприкiнцi зародкового перiоду (кiнець 6-го тижня внутрiшньоутробного розвитку) спостерiгається ф...