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Assessment of thermo-mechanical fatigue of exhaust manifold
Košťál, Josef ; Petruška, Jindřich (referee) ; Šebek, František (advisor)
Tato diplomová práce se zabývá posouzením tepelně-mechanické únavy výfukového potrubí. Nejprve byla provedena rešeršní studie, ve které je rozebrán fenomén tepelně-mechanické únavy. Byly prezentovány hlavní mechanismy poškození a přístupy k jejich modelování. Diskutována byla i specifická chování materiálu vystavenému tepelně-mechanickému zatěžování. Byl vypracován přehled vhodných modelů materiálu a modelů únavové životnosti společně s algoritmem predikce tepelně-mechanické únavy komponenty. Poté byl tento teoretický základ aplikován na praktický případ výfukového potrubí podléhajícího tepelně-mechanickému zatěžování. Dva tepelně závislé elasto-plastické modely materiálu byly nakalibrovány a validovány na základě experimentálních dat. Byl vytvořen diskretizovaný konečnoprvkový model sestavy výfukového potrubí. Model tepelných okrajových podmínek byl předepsán na základě výpočtů ustáleného sdruženého přestupu tepla. Slabě sdružená tepelně-deformační úloha byla vyřešena metodou konečných prvků pro oba modely materiálů. Bylo použito paradigma nesvázaného modelu únavy, které je vhodné pro nízkocyklovou únavu. Životnost byla tedy vyhodnocena jako součást post-procesoru. Použity byly dva modely únavové životnosti – energeticky založený model a deformačně založený model. Získané hodnoty životnosti byly porovnány vzhledem k použitým modelům materiálu a modelům únavové životnosti. Nakonec jsou diskutovány závěry této práce, oblasti dalšího výzkumu a navrženy možnosti na zlepšení použitých přístupů.
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Engineering geological survey of the dam of the Šeberák pond end a recommendation for remediation methods
Zimola, Petr ; Malát, Richard (advisor) ; Košťál, Jiří (referee)
This thesis deals with the dam of the Šeberák pond. This water reservoir is included in III. category of historical water works. The dam is currently showing minor defects, but could be seriously damaged by extraordinary circumstances. The aim of this thesis is to accomplish an engineering geological survey of the dam, to assess its competence and recommend remediation measures. For the purpose of the survey, core boreholes and dynamic penetration tests were performed. Soil samples were taken from the drilling cores for laboratory soil tests. Geomorphological, geological and hydrogeological conditions were described, one longitudinal geological section of the dam and four cross-sections were constructed. Based on evaluated field works and obtained data from the pond manager, the engineering geological conditions of the dam body were described. The most serious concern is the intensity of water seep throught the dam in flood situations. Solution options have been recommended for each part and problem of the dam.
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SERIES DEVELOPMENT
Košťál, Jakub ; ŠLAJER, Vratislav (advisor) ; Horák, Petr (referee)
The Bachelor Thesis deals with the possibilities of an independent producer in the Czech environment in drama series with application to the author's own project. The first part defines the basic terms and explains the work process and the selection of respondents. The second part consists of four semi-structured interviews, each dealing with another type of series and another type of broadcaster. Before each interview, there is a case study of the relevant project, which is discussed further during the interview. The third part is a description of the author's own project. The last chapter before the conclusion deals with the topic of the Czech Film Fund and its support for serial production. The conclusion of the paper deals with the same elements that are based on the interviews and attempts to apply them to the author's own project. The work could be an inspiration for the beginning producers.
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Possibilities of the description of stress-strain curves for computational simulations
Košťál, Josef ; Halabuk, Dávid (referee) ; Šebek, František (advisor)
Tato bakalářská práce se zabývala problematikou určování křivky zpevnění (taktéž „flow curve“) z experimentálně změřených výstupů tahové zkoušky a regresí této zjištěné křivky nelineárními vztahy. Byl prezentován teoretický základ zkoušky tahem a jejího výstupu a také byly popsány rozdíly mezi smluvním a skutečným napětím a přetvořením. Dále byla zmíněna analytická korekční metoda (Mirone-La Rosa) pro odhadnutí trendu křivky zpevnění. Tato metoda využívá standardních výstupů tahové zkoušky. Dále byly vypsány elasto-plastické po částech spojité materiálové modely, a navíc byly vybrány a detailněji rozebrány 4 nelineární vztahy pro popis křivky – Hollomon, Ludwik, Swift a Voce. Následně byla použita metoda konečných prvků pro určení a zkalibrování křivky zpevnění oceli 18CrNiMo7-6, změřené tahovou zkouškou. Pouze standardní výstup tahové zkoušky byl potřeba pro kalibraci. Křivka zpevnění byla zkalibrována iterační výpočtovou metodou na základě srovnání reakční síly ze simulace se silou z experimentu. Nakonec bylo vytvořeno uživatelské prostředí pro nalezení nejlepší regrese ze čtyř vybraných nelineárních vztahů.
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Vzdělávání dospělých v podmínkách dřevozpracujících oborů středních odborných škol
Košťál, Jiří
This work is focused on the identification and description of trends in the woodworking fields in combined or distance form of the further education. The theoretical part is devoted to trends in professional education in the field of woodworking and it deals with professional qualifications as an instrument of the active employment policy. The introduction of the practical part introduces the educational institution where these trends in education are applied and where the data collection for questionnaires was conducted. The main part of the practical part is devoted to the questionnaire surveys. It includes the input questionnaire of statically selected group of candidates, the questionnaire survey among students, the evaluative questionnaire survey of graduates and the questionnaire survey of employers of graduates and how they see further employment of retraining participants in the labour market. The aim of this work is to identify the trends and define the methodology for solving trends in the professional growth of adult education in the field of woodworking.
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Effect of operating parameters of the boiler on presence of fine particles in flue gas
Košťál, Jan ; Poláčik, Ján (referee) ; Pospíšil, Jiří (advisor)
This diploma thesis is devoted to the issues of the formation of fine particles in dependents on the combustion parameters. The first part of thesis is review, which summarized the information about combustion process and about formation of the gaseous products and fine particles inside them which created during combustion process. The main content of thesis is realization of measurements of fine particles from combustion, in several types of the tested combustion devices. Next part is a description of used measurement devices, which used for measurement. Last chapters are focused on evaluation of results from the measurements, comparison of the measurements between themselves and the finding the existence of the dependence of the formation of fine particles on operational parameters of boiler. And all results are evaluated in the conclusion.
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Unconsciousness of unknown etiology in first contact
KOŠŤÁL, Jan
This Bachelor Thesis deals with the topic: "Unconsciousness of unclear etiology upon the first contact of the emergency services with a "patient". The causes of unconsciousness are generally very diverse, which means that the exact cause can remain unclear during the first contact and during the phase of pre-hospital emergency treatment.Duringthelaterphaseof hospital care,more time and more sophisticated ways of examination are available to clarify the exact cause of unconsciousness. In the theoretical part of this Thesis, was a summarize the basic knowledge on consciousness and on the causes of impaired consciousness or unconsciousness. Next is a describe the diagnostics of unconsciousness during the pre-hospital medical care and present the practical procedures that need to be followed by paramedics taking care for unconscious patient. The most often causes of unconsciousness are: hypoglycemia, intoxications, craniocerebral injuries, hypoxia linked to cardiopulmonar resuscitation, bleeding to brain and brain stroke. From the point of view of the paramedic, the most important is to make early distinction between the states linked to intoxication or metabolic disorders and the states linked to intracranial injuries, bleeding and stroke. While the former states require immediate intervention by paramedic, the later states require neurosurgical intervention in the hospital. In the experimental part of this Thesis, was mapped the practical knowledge of paramedics on pre-hospital medical care for for unconscious patient. The mapping was conduct using the technique of standardized semi-structured dialogues with 14 respondents paramedics selected from all seven regional stations of the Emergency services of the South bohemian district, Czech Republic. The respondents differed in age, duration of their professional career, and level of education. All respondents answered 16 questions. All their answers are presented in the Thesis in the full form as well as processed in the Table form. In investigation proved practical difficulties with the diagnostics of unconscious patients. The results indicate that more attention should be paid by paramedics to obtaining full and correct anamnesis plus general examination of the patient. Based on early diagnosis, paramedics can decide on therapeutical procedures and on directing the patient to relevant hospital. In case of patient with secured life-functions, it is recommended to direct the patient to specialized healthcare facility, which shortens the interval between injury and targeted treatment. Results also point toward the general need that paramedics should undergo regular training in new methods and trends in paramedical care. Using of new methods of capnometry is one case where more widespread usage in paramedical practice could bring significantly better results.
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Position Improvement Using Differential GPS
Košťál, Jaroslav ; Hrubý, Martin (referee) ; Novotný, Tomáš (advisor)
The bachelor thesis describes techniques of precision of a position using a differential GPS. The theoretical part provides with basic terminology on classical and differential GPS and with a blueprint for implementation of the differential GPS. The aim of the practical part is the implementation of the blueprint per se using two suitable GPS modules with data processing on the station in real time and creation of a graphical interface. The final determining of the position should be more accurate than one using a classical GPS.
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