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System for Support of Short-Term Car Rentals Based on Carsharing
Vrtal, Petr ; Bidlo, Michal (referee) ; Šimek, Václav (advisor)
The aim of this thesis is to create a system for the transformation of an ordinary passenger car into a vehicle capable of sharing in the form of short-term loans. Vehicle rentals are completely unattended, which was achieved by implementing service applications in the form of an administration and user tool. The administrative application was created using web technologies, primarily Next.js and React. The customer application was implemented with the goal of high portability, and therefore its development was directed to mobile platforms using the React Native framework and the Expo tool. The vehicle is equipped with its own designed IoT end device in the form of a printed circuit board, capable of permanent wireless connection to the network based on LTE-M technology and MQTT protocol. The purpose of this device is to provide current vehicle data obtained by reading communication on the CAN bus, connecting to a standard OBD-II diagnostic port. An important part of the work was the execution of a series of tests of all sub-aspects of the implemented architecture, focusing mainly on reliability, resulting functionality and user-friendliness. The resulting system was tested in real operation and represents a way of non-invasively transforming a regular passenger car into a car capable of sharing.
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Design of nozzle for ozone admission
Krajcar, Ivo ; Hudec, Martin (referee) ; Rudolf, Pavel (advisor)
The thesis consists of three main parts. The first part contains a research focused on cavitation and fractal geometry. Furthermore it researches disinfection, mainly disinfection using UV radiation and ozone. It is concluded by mentioning advanced oxidising processes used for dangerous pollutant elimination and pointing out of positives and negatives of the individual technologies. The main goal of the fractal geometry research was to briefly explain what a fractal is and how to create different types and degrees of fractals. The second part of the thesis contains a simplified description of the design of a fractal orifice with air suction. This orifice is compared to a simple orifice with a circular opening in the last part of the thesis. Both orifices have the same cross section flow area. This part also describes a simple UV reactor design process. The third part of the thesis describes the experimental measurements of both of the orifices. The data gained from the measurements show that the fractal orifice has a better mixing influence than the circular one and also that the fractal orifice has a wider operational range than the circular one.
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Design of Rubik's Cube Solver
Palán, Petr ; Šperka, Petr (referee) ; Svoboda, Petr (advisor)
The Rubik’s Cube is one of the most famous puzzles in the world, it has evolved into countless variations and in its solving is competed all over the world. However, the record time for its solution is no longer held by a human, but by a robot. This bachelor thesis deals with the structural design and subsequent implementation of the mechanical part of the solver for the Rubik's Cube. A research of existing solvers is carried out and then individual conceptual designs are proposed. The chosen variant is then elaborated in the structural design. It individually controls 5 walls of the cube and thus ensures the possibility of its solving without the need for further positioning and at the same time there is space for comfortable insertion of the cube. The design is then realised by 3D printing. Thereafter an electronic part is connected to the created structure and a simple program written to test the structure is executed using a microcomputer. The result of the testing is that the design is functional but there is room for improvement.
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Plating of materials for 3D printing
Jančí, Jakub ; Bayer, Robert (referee) ; Starý, Jiří (advisor)
This bachelor's thesis deals with an introduction to the issue of plating plastic parts printed on a 3D printer. The thesis includes an overview and comparison of 3D printing technologies and materials, particularly from the perspective of chemical resistance, plating, and soldering, which are used in 3D printing manufacturing technology. The thesis provides a detailed description and discussion on the application of metal coatings to printed objects made from various 3D printing materials. The practical part of the thesis focused on the production of test samples and their subsequent plating process.
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Design modification and CFD simulation of the filling valve
Klíma, Štěpán ; Kohút, Jiří (referee) ; Klas, Roman (advisor)
This thesis deals with the design of a filling valve guide using a metal 3D printing method for application in a hydraulic press. The production of a filling valve guide using traditional forms of manufacturing in terms of labour, production, technology and time-challenging processes and the metal 3D printing method can help to overcome some of these challenges. The introduction of this paper is concerned with explaining the function of filling valves in the hydraulic press mechanism and a brief introduction to valve guide manufacturing technologies, including metal 3D printing technology. This is followed by an explanation of the new design in terms of the technology used. A strength analysis using FEA is then developed to determine the functionality of the valve guide and to optimise its shape. In this section, an iterative procedure was used to reduce the reduced stress in the ribs to 68 % of the reduced stress of the original design by changing the valve guide geometry. At the same time, a theoretical introduction to FEM is written, including an explanation of the non-linearities in FEM. This is followed by a comparison of the hydraulic losses due to oil flow through the original valve and the valve with the modified valve guide. Similar to the FEM chapter, a theoretical section is also written introducing CFD, mesh generation for CFD and turbulence models.
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Optimization of air transport in the fan chamber with a free impeller
Cakl, Dominik ; Bašta, Jiří (referee) ; Cifrinec, Ivan (referee) ; Rubina, Aleš (advisor)
The work deals with the improvement of the hydraulic properties of air transport in fan chambers with free impeller wheels, which are equipped in every larger central air handling system. Every larger central air handling system is equipped with a fresh air intake that transports the air into a fan chamber, which contains a free-wheel fan that provides air transport and provides kinetic energy to the air stream. From the fan chamber, the air is further transported by the air handling system to the individual distribution elements. Similiary, the extraction of polluted air is solved through the fan chamber. The turbulent flow of air at the outlet of the impeller causes a pressure loss in the discharge chamber of the air handling unit, as the air is transported in pulses according to the slip of the blades. In practice, fans with smaller performance parameters measured in laboratories under ideal boundary conditions are installed in air handling units, which do not solve the problem of the difference in real traffic pressure between the supply and exhaust air ducts, with the result that the installed fans in the real fan box do not reach the parameters specified by the manufacturer. Reduction the pressure losses in fan chambers is correlated with the reduction of energy consumption of equipment ensuring air transport in the context of sustainable construction. Based on the development of aerodynamic efficiency of fans and European legislation, the current trend of a significant reduction in energy consumption was described, among other things, for equipment providing air transport, through repairs, reuse, repurposing and recycling of used materials, and through extending the life of products and buildings. Furthermore, three research principles and methods of improving the efficiency of equipment in order to reduce the energy demand of equipment ensuring air transport are presented, the authors of which approach the research numerically and experimentally. The goal of the original technical solutions presented in this work is to present a development that optimizes the pressure losses of a fan chamber with a free impeller. The first solution describes the principle of lead-in plates, where the goal is to help the air stream eliminate the negative effects of swirling and facilitate the outflow of air from the fan chamber by means of a smooth slide along an inclined surface, which reduces the specific power of the fan, under the given marginal conditions, by up to 5.9 %. The essence of the second innovative technical solution is to present a free impeller, which is based on the connection of two rows of curved blades of concave and convex shape, which serves to optimize the pressure loss of the fan chamber with a free impeller, which produces smaller, more uniform, mutually interacting currents that help the flow of air to more smoothly change the direction of swirling in the fan chamber and which found practically no value for the specific measured boundary conditions. The essence of the third innovative technical solution is the introduction of modern production of products from "sustainable" materials with the help of 3D printing, in the form of a free impeller for fans with a free impeller. The results of geometric copies of free impellers made of lighter material reflect that there was a reduction in the average specific power of the fan by up to 4.4 %, while at the same time there was a reduction in the total sound level.
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Device for measuring tensile tests of 3D printed materials
Besta, Pavel ; Binar, Tomáš (referee) ; Vyroubal, Petr (advisor)
This thesis deals with the problematics of 3D printed materials, specifically with FDM and SLA methods of 3D printing and their reliability when it comes to tensile strength. After comes introduction of materials used in FDM and SLA 3D printing and description of how certain printing parameters affect the final mechanical properties of 3D printed parts. Last theoretical part of this thesis deals with tensile tests and the means of getting deformation curves out of these tests. In the practical part of this thesis is described the design of electronics for a device for measuring tensile tests provided by the institute of electrotechnology. Part of this thesis is also a detailed guide on how to perform and evaluate tensile tests and measured mechanical properties of some materials.
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Robotic Manipulator Exploiting RC Components and Servos
Liška, Jakub ; Nosko, Svetozár (referee) ; Zemčík, Pavel (advisor)
Cieľom tejto diplomovej práce bolo vytvorenie vlatného robotického manipulátoru, s pou-\\žitím RC(diaľkovo ovládaných) komponentov a servomotorov. V rámci riešenia bolo potre-\\bné robotický manipulátor vybaviť senzorikou, ktorá umožnuje detekciu kolízii s okolím a zabezpečuje tak bezpečnosť obsluhy v pracovnom priestore manipulátoru. Robotický manipilátor je taktiež vybavený absolútnimi enkódermi pre snímanie polohy jednotlivých kĺbov, akcelerometrom a senzormi pre meranie záťaží pôsobiacich na jednotlivé kĺby. O pohyb ramena sa starajú štandardné krokové motory. Samotné telo robotického manipulátoru bolo navrhnuté s ohľadom na jednotlivé komponenty a je možné ho vyrobiť pomocou 3D tlače. Súčastou riešenia je aj užívateľské rozhranie, pomocou ktorého je možné robotické rameno ovládať.
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Tabletop acrylic paint shaker
Vostradovský, Tomáš ; Žáček, Jiří (referee) ; Klapka, Milan (advisor)
This bachelor thesis deals with construction of a model paint desktop shaker for small containers. Included is an overview of solutions available on the market, creation of design proposals, selection of a suitable solution and its finalization into production documentation. Following is production of a prototype and verification of its functionality.
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Data Concentrator of 3D Printer's Sensors and Devices
Vaculík, Samuel ; Rusnák, František (referee) ; Arm, Jakub (advisor)
The bachelor thesis consists of designing and implementing a system for collecting data related to 3D printing. The aim is to define the variables suitable for measurement, select sensors for the measurements and implement them on the printer. The next point is the design and implementation of data acquisition from the printing firmware Klipper for collecting print data. Then the task is to implement the software for processing data from the individual measurement sources, including data flow analysis in the system.
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