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Development of infrastructure for testing materials under vacuum – outgassing
Večeřa, Tomáš ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
This master thesis deals with the design of a testing device outgassing properties of materials. In the research part, standards dealing with this topic are described and research of existing devices from publicly available sources is carried out. The output of the theoretical part is a list of a total of seventeen requirements that the resulting device must meet. In the practical part, a list of all systems entering the device is created and then a detailed model of the device is created. The device consists of a vacuum chamber and an inner apparatus in which the test takes place. Lastly, the fulfillment of all set requirements is evaluated, and a test plan is presented.
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Thermal management for mission CIMER
Borovička, Matej ; Lazar, Václav (oponent) ; Götthans, Tomáš (vedoucí práce)
This thesis deals with the thermal analysis of the CubeSat, the evaluation and subsequent implementation of the results in the satellite design itself is very important to ensure the proper functioning of all its components. The first part describes thermal analysis issues and proposals for space applications. The second part is devoted to the thermal design of the CIMER nanosatellite, whose mission is to cultivate cyanobacteria in low Earth orbit. Cyanobacteria have very specific requirements in terms of the temperature range in which they can survive. This analysis is therefore very important for the functioning of the entire mission. The thesis describes the creation of a thermal design in the software Systema Thermica, its subsequent analysis and evaluation. Finally, the model is adapted to the conditions required for the survival of cyanobacteria in space.
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Návrh termo-vakuové komory pro testování CubeSatů
Jalůvka, Jiří ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
Práce se zaměřuje na vývoj termo-vakuových komor pro měření CubeSatů. V rámci toho byl proveden průzkum dostupných termo-vakuových komor v České republice. Další část práce se věnuje definování požadavků na testování CubeSatů v termo-vakuovém prostředí. S ohledem na tyto požadavky bylo provedeno srovnání existující komory na Leteckém ústavu VUT a byly navrženy různé varianty řešení pro jednotlivé problémy. Konkrétně byly navrženy tři inovativní přístupy do komory, termální systémy a způsoby uchycení satelitu v komoře. Práce tedy nejen popisuje ideální podobu termo-vakuové komory s veškerými systémy, ale také přináší konkrétní návrhy pro optimalizaci stávající komory na Leteckém ústavu, pro možnost úspěšného testování CubeSatů.
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Proposal of the modular support equipment for the CubeSat integration
Kukla, Ondřej ; Lazar, Václav (oponent) ; Vaverka, Jan (vedoucí práce)
The aim of this diploma thesis is to create a design of Mechanical Ground Support Equipment for CubeSat integration. In the text below, CubeSats are generally introduced together with commercially available products for their integration. The final design was chosen based on a comparison of parameters and results from the market research. The design itself was successfully created, 3D data and drawings are attached to the work.
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Flexible structure development for efficient heat transfer
Černoch, Jakub ; Lazar, Václav (oponent) ; Mašek, Jakub (vedoucí práce)
The master’s thesis deals with theoretical calculations and design of a structure for heat transfer, which is part of a Miniaturized Heat Switch according to the specified requirements of the European Space Agency. The basic parameters are low weight and high thermal conductivity. The work follows the switch designed by Arescosmo, which did not meet the requirements, especially in the area of weight and thermal conductivity. Using theoretical calculations of weight and thermal conductivity, 49 variants were verified in 3 basic concepts – Mechanical contact structure, flexible structure composed of wires and foil structure. In terms of thermal conductivity, the best structures are those based on the use of metal stocking and sleeving braids. Manufacturing technologies have also been proposed from available sources that could be used to produce these structures. To meet the requirements, in the next phase of the project it will be necessary to produce experimental samples on which the theoretical calculations and selected technologies will be verified.
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Verification of multi-layer insulation in simulated space environment
Čapka, Filip ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
The first part of this thesis stays the currently used ways of active and passive thermal control in spacecrafts. It focuses on Multi-layer insulation, which is one of the passive methods of thermoregulation. It describes the materials from which MLI is usually made and describes the most problematic parts of its use and production. In the second half the thesis describes the devices used for a proposed test of MLI´s performance as a barrier against heat loss. The results of the experiment are concluded in the end.
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Design proposal of the 12U CubeSat structure
Kopecký, Matěj ; Lazar, Václav (oponent) ; Junas, Milan (vedoucí práce)
CubeSats are nowadays highly popular topic, due to their price and simplicity. Lately, their use is mainly concentrated in commercial sphere of market, where number of companies providing wide spectrum of services for CubeSat missions, are being founded. One of these companies is also Czech Aerospace Research Centre (VZLÚ), which recently began development of series of 1U – 3U CubeSat structures. This master´s thesis is written in collaboration with VZLÚ. It is focused upon creation of information platform, including market research and following design with its analysis and check of 12U CubeSat structure as a continuation in the scope of further development of series of 6U – 12U structures.
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Design proposal and analysis of the 3D printed 1U CubeSat frame
Kilián, Ondřej ; Jetela, Václav (oponent) ; Lazar, Václav (vedoucí práce)
This thesis contains the process of design and subsequent FEM analysis of a CubeSat class satellite with accordance to the “CubeSat Design Specification” from Californian Polytechnic State University revision 14. The software used for the design and generation of supportive materials is the Autodesk Inventor Pro 2020, generation of the G-code for printing is done in the PrusaSlicer 2.4.1. software and the analysis are done in the MSC Pantran and MSC Nastran software package. The overall design is considered as successful as it meets all the criteria, and the analysis shows that it can withstand the loads present in the launch process to the earth’s orbit.
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Experimental study on satellite´s passive thermal-regulation units
Mateášik, Timko Marek ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
Master‘s thesis examines the eect of thermal interface materials on thermal contact conductance and resistance. The thesis focuses on application of the thermal interface materials for the thermal contact conductance enhancement in the miniaturised heat switch and the spacecraft generally. Theoretical part of this work briey reviews variety of passive thermal control systems used in spacecraft, including thermal interface materials and explains the background of this work. This work further a reviews of the variety of thermal interface materials, especially coatings and foils, and introduce the selection of suitable thermal interface materials. Experimental part of this work examines surface parameters, thermal conductivity and microhardness of copper specimens which serve as substrate for pure silver coating. Further examines the measurement conditions, evaluation methods and experimental measurements. The experimental measurements are carried out in thermo-vacuum test chamber and conclusion are made based on the results. The recommendations for further work are made.
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Conceptional design for upgrade use of Cleanroom for aerospace parts testing
Halamíček, Samuel ; Mašek, Jakub (oponent) ; Lazar, Václav (vedoucí práce)
The thesis focuses on the problematics around designing a cleanroom. The aim is to present a conceptional design to upgrade the use of a cleanroom for aerospace parts testing. The first part of the thesis covers the introduction into the cleanroom problematics. Based on the research and the given requirements, the parameters for the cleanroom are defined. The second half presents a conceptional proposal where each one difference represents a different mindset behind it. For verification of a possibility to achieve the aimed classification, the model of the cleanroom was constructed in a SOLIDWORKS and then the airflow inside the cleanroom was simulated in an ANSYS FLUENT.
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