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Stress-deformation analysis of the high voltage transmission tower
Kuběna, Tomáš ; Pokorný, Jan (referee) ; Fuis, Vladimír (advisor)
The thesis deals with the analysis of a high voltage power pole near the village Lešná, whose collapse will cause an outage of the electricity network in the area. The model of the pole was created on the basis of drawings provided by Arpex Moravia s.r.o. The pole is designed as a truss system using the general node method, subjected to the weight of the structure, wind and the weight of live conductors. The analytical calculation is performed in Matlab and then verified by numerical calculation in Ansys Workbench. When the pole is subjected to all previously mentioned loads, the maximum deformation has a magnitude of u_max=18.89 mm, which is mostly affected by the wind action. The resulting safety to elastic limit state is k_MSP=23.95. The pole is operated with sufficient safety and collapse will not occur under normal operating conditions.
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Modern motor vehicle batteries
Komárek, Radim ; Šebela, Kamil (referee) ; Štětina, Josef (advisor)
In response to pressure from the European Union to reduce emissions, requirements on car manufacturers are increasing, paving the way for a shift from traditional internal combustion engines to electric drives with energy stored in batteries. The battery itself is made up of modules in which battery cells are stored. To get the correct voltage output, the battery modules and the cells in them need to be wired. Where parallel wiring of the cells with serial wiring of the modules is most appropriate. The most commonly used cells are cylindrical and prismatic cells, which are further divided into prismatic cells and pouch cells. Cylindrical designs are suitable for applications where maximum power output is required, while prismatic designs are better in energy efficiency. Thermal management is very important to keep the batteries within a narrow temperature window. Liquid cooling is preferably used, which has an order of magnitude higher efficiency. This thesis focuses on the analysis of these technologies and their impact on the efficiency and lifetime of battery systems in the automotive industry.
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Strength calculation of high-pressure steam piping according to EN 13480
Řezník, Dominik ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
The Master's thesis deals with the stress and strength calculation of a high-pressure steam piping system, which is part of the steam piping system of a waste-to-energy plant. In the theoretical part of the thesis, basic knowledge about stress and strength and piping systems (pipe support system, types of loads, fittings and other components) is summarized with respect to the used standards. Part of the theoretical section also includes one of the objectives of the thesis, which is to provide basic knowledge about the KKS codes. In the practical part, firstly, using the VVD software, the pipe class is calculated and created in order to design nominal thicknesses of all the pipes and fittings from the piping system. The core part of the work is the performance of the stress and strength calculation in the CAESAR II software, which includes the appropriate setting of the calculation model based on the calculated pipe class and the documentation from the customer, the selection of pipe supports and the adjustment of the pipelines based on the previous and ongoing results. As part of the calculation, the nozzle loads and support loads are also assessed and verified. In the last part of the work, a simplified FEM calculation of the dump-tube (transition component for steam discharge into the condenser) is performed in PRG NozzlePro software. All the modifications are continuously discussed and the results are then summarized.
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Stress analysis of the only extant pier of the former Ivančice viaduct
Pelaj, Jakub ; Fuis, Vladimír (referee) ; Vaverka, Jiří (advisor)
The bachelor thesis focuses on the stress analysis of the original Ivančice viadukt pillar. The introductory part describes the theoretical basis necessary for the analysis. The second part deals with the history and assembly of the bridge. The third part dedicates to the creation of three-dimensional structure which serves as a basis for conducting the stress analysis. The following part provides a detailed expanation of the solution process and analytical calculations itself. In the conclusion, the obtained results are verified using numerical calculations a supplement with partial results concerning an additional type of load.
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High-current solid state relay
Daďa, Pavel ; Ctibor, Jiří (referee) ; Červinka, Dalibor (advisor)
The bachelor's thesis deals with the design of an electronic semiconductor contactor for power switching of battery systems. The work includes familiarization with the function and use of photovoltaic systems and familiarization with types of battery systems. Furthermore, the original solution using the GIGAVAC GX23 power contactor and introduction along with the design and dimensioning of the newly proposed solution using a power semiconductor contactor. The conclusion of the work summarises the findings of the design and possible extension of the final product. The text of the thesis is divided into six chapters. The first chapter contains a description of the issue of connecting battery modules in the FVE area. The second chapter deals with the issue of connecting battery blocks. The third chapter contains a general description of the SSR for alternating voltage switching. The following fourth chapter describes SSR relays for dc voltage switching. The fifth chapter describes the specific solution of the power switch including the dimensioning of the power elements and the design of the radiator. In the next chapter, the knowledge and possibility of further development of the SSR contactor.
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Equipment for handling the switchgear panel
Brauner, Jiří ; Černohous, Josef (referee) ; Kašpárek, Jaroslav (advisor)
The work deals with the design of a handling device used for lifting, rotating, and moving a switchboard. The first part of the work includes a review of technologies for handling large loads. The second part contains a summary of legislative regulations for handling switchboards. Furthermore, the work includes the design of the handling device, comprising the concept design, construction design, and strength verification of selected structural nodes.
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Model of the bridge for presentation of the member system
Chlup, Pavel ; Krejčí, Petr (referee) ; Appel, Martin (advisor)
In this bachelor thesis, the individual parts of the model bridge structure are explained with a brief commentary on their creation. Subsequently, the computational modelling of the problem using statics and its practical solution using strain gauges and MATLAB software is elaborated upon. The thesis is divided into a total of four chapters, where the first one is devoted to research on the application of statics and strain gauges. Subsequently, the function of each part of the fabricated model is formulated and a static model of the truss system which is equivalent to the fabricated model but is statically indeterminate without further considerations is presented. Then, the principle on which strain gauges are applied to solve the insolvability of the system is explained and as a result, the force action in the truss system as a function of the load is plotted using an application developed in MATLAB software. The result is a comparison of the measured and calculated values in the truss system.
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Stress-deformation analysis of the indoor basketball construction
Kubíček, Daniel ; Kovář, Jaroslav (referee) ; Fuis, Vladimír (advisor)
The topic of this thesis is stress-strain analysis of a basketball structure in a gymnasium. This structure is divided into two parts. One part is modeled as a spatial bar system. The other part is modeled as a plane bar system. The first part of the paper deals with the research on the use of bar systems in sports. This is followed by the development of analytical computational models of the spatial and plane bar systems. These models are then used to calculate three different loading conditions. Subsequently, the models are developed for numerical solution. In the last part of this work, the analytical solution is verified by the numerical solution.
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Stress analysis of eye bolts
Kareš, Pavel ; Kubík, Petr (referee) ; Vaverka, Jiří (advisor)
The bachelor's thesis focuses on the calculation of stress arising from the loading of an open or closed eye bolts. The first part of the thesis provides an overview of eye bolts, their uses, and their differences. It also describes the theoretical background necessary for correctly solving the tasks in the second part of the thesis. The second part presents a total of four examples of stress calculations. The first two examples are solved for an open eye bolts, and the last two for a closed eye bolt. For each type of eye, two examples are solved: one task for axial loading and one task for loading perpendicular to the bolt's axis. Each task includes an analysis of the example and determination of the internal stress resultants (ISR). From the knowledge of the ISR, the critical point is found, and the maximum stress is determined, first using the theory of straight beams and then the theory of curved beams. Additionally, the safety factor is calculated using each maximum stress. At the end of each example, an analysis is also performed using the numerical method in the ANSYS Workbench software. Finally, a comparison is made between the results from the analytical calculation and those from the ANSYS software.
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Preparation and design of the production of bevel gears using the Reverse engineering method
Šimáček, Daniel ; Sedlák, Josef (referee) ; Slaný, Martin (advisor)
This thesis addresses the reverse engineering of the assigned gears. The first part is dedicated to a theoretical review of the issues related to bevel gears, strength calculations of the gearing and defects that can occur during operation. This is followed by the production of bevel gears with helical teeth and the most common heat treatment of gears. The second part emphasizes the actual process of reverse engineering, describing the digitization of gears and their conversion into a solid body in CAD software. After obtaining the key dimensions of the gear set, an analytical calculation of the load capacity in contact and bending is performed, accompanied by a numerical calculation using the finite element method to determine the bending stress at the tooth root. Dimension verification is conducted through dimensional analysis in specialized software to potentially reveal deviations and inaccuracies in construction based on 3D scanning. The final part deals with the design of the technological process for the production of gears, followed by a technical-economic assessment of the preparation and actual production of the gears. The drawing documentation was created based on the 3D volumetric models generated from the scanned gears
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