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Apartment building in Prague - construction and technological studies loft
Pražák, František ; Venkrbec, Václav (referee) ; Vlčková, Jitka Laura (advisor)
The aim of the bachelor´s thesis was to elaborate the construction and technological study, focusing on the loft conversion of the apartment building in Prague 6, the urban district Bubeneč. The construction and technology project addresses for the given technological phase mainly the rules for the building including the facilities of the construction site, summary technical report, budget, technological regulation for the implementation of the roof deck and plasterboard partitions, time plan of the building, budget, proposal of the machine set, qualitative requirements and their provision and occupational safety during realization of the building.
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Localization of Combustion Engine Noise Origin with the use of Acoustic Emission
Rasch, František ; Mazůrek, Ivan (referee) ; Klíčník,, Martin (referee) ; Pražák, František (referee) ; Píštěk, Václav (advisor)
This doctoral thesis deals with the diagnostics of combustion engines, which have clearly suffered a mechanical damage. The text describes a basic principle of a diagnostics based on an observation of a noise of a running engine. There are mentioned the basic methods of a noise recording with direct conection to the specifics of measurement a running combustion engine noise. The introduction describes the spread of a vibration in solid structures. For the combustion engine vibration and source of noise is dedicated an independent chapter, which focuses on all noise generators, not only mechanical and thermodynamic but also noise caused by fluid and gas flowing. An integral part of the thesis is also a list and examples of signal processing, serving for efficient localization of the noise root cause. The noise statistics are compared with event diagram of engine investigation. Considering the information of the crank shaft position, we are then able to localize a possible root cause of the mechanical problem. For this purpose unique computer software for MS Windows operation system was developed. This system is able to generate event timelines of the piston engines. The inputs are basic engine data, such as the number of cylinders, ignition sequence, valve timing diagrams and information regarding two stroke or four stroke engine types. The program also allows us to detect a potential damage by direct comparison of the engine timeline and noise signal input. The thesis is also supplemented by measurements serving for key-parameter-diagnostics, i.e. the selection of the most suitable running engine operation. Comparison of different technical diagnostic approaches shows the suitability of mentioned diagnostic process.
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Faktory ovlivňující množství silice izolované z různých taxonů rodu Mentha L. (máta)
Pražák, František
The aim of this thesis was gathering current literature data on factors (internal - the type, stage of development) and (external - soil and climatic conditions for cultivation) that most affect the oil content in the genus Mentha L. On the basis of the results obtained during laboratory analysis of quantitative content of essential oils in plants of the genus Mentha L. taxa planted on an experimental plot of garden-technical faculty in the refrigerator was a hypothesis based harvesting time, the impact of species and cultivars on the essential oil content is confirmed. Further, the predicted calculation that based on the current state of the essential nutri-ents in the soil experimental plot could be the addition of nitrogen fertilizer to increase the amount of green mass, and while maintaining the integrity of the plants, especially leaf area increase the total yield of oil from the cultivated taxa genus Mentha L. The direct impact of climatic conditions on essential oil content was not established due to the very dry summer with little rainfall and dependence on irrigation.
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Localization of Combustion Engine Noise Origin with the use of Acoustic Emission
Rasch, František ; Mazůrek, Ivan (referee) ; Klíčník,, Martin (referee) ; Pražák, František (referee) ; Píštěk, Václav (advisor)
This doctoral thesis deals with the diagnostics of combustion engines, which have clearly suffered a mechanical damage. The text describes a basic principle of a diagnostics based on an observation of a noise of a running engine. There are mentioned the basic methods of a noise recording with direct conection to the specifics of measurement a running combustion engine noise. The introduction describes the spread of a vibration in solid structures. For the combustion engine vibration and source of noise is dedicated an independent chapter, which focuses on all noise generators, not only mechanical and thermodynamic but also noise caused by fluid and gas flowing. An integral part of the thesis is also a list and examples of signal processing, serving for efficient localization of the noise root cause. The noise statistics are compared with event diagram of engine investigation. Considering the information of the crank shaft position, we are then able to localize a possible root cause of the mechanical problem. For this purpose unique computer software for MS Windows operation system was developed. This system is able to generate event timelines of the piston engines. The inputs are basic engine data, such as the number of cylinders, ignition sequence, valve timing diagrams and information regarding two stroke or four stroke engine types. The program also allows us to detect a potential damage by direct comparison of the engine timeline and noise signal input. The thesis is also supplemented by measurements serving for key-parameter-diagnostics, i.e. the selection of the most suitable running engine operation. Comparison of different technical diagnostic approaches shows the suitability of mentioned diagnostic process.
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Apartment building in Prague - construction and technological studies loft
Pražák, František ; Venkrbec, Václav (referee) ; Vlčková, Jitka Laura (advisor)
The aim of the bachelor´s thesis was to elaborate the construction and technological study, focusing on the loft conversion of the apartment building in Prague 6, the urban district Bubeneč. The construction and technology project addresses for the given technological phase mainly the rules for the building including the facilities of the construction site, summary technical report, budget, technological regulation for the implementation of the roof deck and plasterboard partitions, time plan of the building, budget, proposal of the machine set, qualitative requirements and their provision and occupational safety during realization of the building.
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