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Analysis of the procedure for identifying potentially dangerous locations of weld joints in thin-walled metal structures during life assessment
Doležel, Daniel ; Pavlík, Ondřej (referee) ; Vosynek, Petr (advisor)
Hodnocení únavy svarů u tenkostěnných kovových konstrukcích je klíčové pro zajištění integrity navrhovaných konstrukcí. Navzdory zavedeným kritériím a S-N křivkám může být analýza životnosti svařovaných spojů u geometricky komplexních součástí značně komplikovaná. Hlavní překážkou je identifikace kritických míst z hlediska únavy pro detailní výpočet, což může být časově náročné i při využití metody konečných prvků (MKP). Tato práce podrobně zkoumá hodnocení únavy svarů, zahrnuje vhled do relevantní literatury, komerčních řešení a praktický kontext norem železničního průmyslu a směrnice FKM. Významným přínosem práce je vývoj automatizovaných FEMAP API programů pro MKP software Siemens FEMAP, které usnadňují proces analýzy. Tyto programy šetří čas a úsilí tím, že umožňují zjednodušenou analýzu založenou na konceptu lokálního nominálního napětí (local nominal stress) v souladu se směrnicí FKM. Metodika, podpořená vyvinutými programy, je v této práci popsána a prakticky demonstrována. Praktické přínosy této práce spočívají v poskytnutí alternativy ke komerčním softwarům, za účelem zvýšení efektivity analýzy životnosti svarů v kontextu konstukčních návrhů.
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Comparison of operational vibrations of selected types of flexible couplings for high-speed applications
Práznovský, Alexander ; Pavlík, Ondřej (referee) ; Pokorný, Jan (advisor)
Focus of the bachelor thesis is the selection from suitable candidate of flexible couplings for high speed applications. Flexible couplings introduce excitation forces into the system that cause vibrations. It was necessary to determine which flexible coupling is the most suitable for the tested assembly. In the research section, the flexible couplings in particular were described, but also all the essential parts of the test assembly and their functionality. Furthermore, the data processing and evaluation procedure is described in the thesis. For the possibility of an overall processing of all measured data, a calculation using the finite element method was performed to determine the applicability of the double-loop flexible coupling. The output of the bachelor thesis was the selection of the best flexible couplings for the test assembly.
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DC/AC inverter for small asynchronous machine
Pavlík, Ondřej ; Patočka, Miroslav (referee) ; Červinka, Dalibor (advisor)
The aim of this Bachelor thesis is to propose three-phase converter of low power 100W for driving the asynchronous motor. The device is suitable for construction with fans. This proposal was optimized in light of close price and of technical practicability. The arrangement is possible to use in less exacting applications where it was guarded high price of common converters so far. For allocation catalogue scheme were chosen acceptable components and designed the board of printed circuits.
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Neutralization of acid solutions
Pavlík, Ondřej ; Bébar, Ladislav (referee) ; Jícha, Jaroslav (advisor)
The present thesis is concerned with neutralization of acid groundwater after the hydrochemical uranium mining in the area of Stráž pod Ralskem. In the thesis is briefly described progression of the hydrochemical uranium mining and follow-up negative impacts on the environment. There is described the technology involved in its disposal. This is followed by the design calculation of major apparatus technology associated with neutralization of acid solutions. Output of technology is determined by the mass balance. The results are the main dimensions of the apparatus, mechanical parts and electric power each device.
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Design of the composite rotor sleeve of a high speed rotary machine
Pavlík, Ondřej ; Ševeček, Oldřich (referee) ; Návrat, Tomáš (advisor)
The diploma thesis focuses on manufacturing carbon fiber and epoxy composite material using filament winding method. Material properties of manufactured composite are ap-proximated using analytical and numerical homogenization models. Calculated material properties are applied to design and evaluate reserve factor of retaining sleeve for high speed brushless permanent magnet synchronous motor. Margin of safety of designed rotor is evaluated using composite failure criteria. Test stand for both static and dynamic testing is designed, static test stand is manufactured and assembled. Static strength test is carried out.
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Frequency inverter for small induction machine
Pavlík, Ondřej ; Procházka, Petr (referee) ; Červinka, Dalibor (advisor)
The aim of this diploma thesis is to continue in prototype realization and a final proposition of three-phase frequency transformer pilot projected in scope of my bachelor work. This transformer is outlined for a small unsynchronized engine to 100 watt output and is designed to supply the fan motor. This suggestion was optimalized from the standpoint of bargain low price and technical feasibility. Powerful part of transformer is solved with help of circuit FSB50450 which is fed from compact source MYRRA 47155. Steering system is guaranteed with circuit MC3PHAC. This device is possible to use in less demanding applications where it was resisted by high expensive price of common frequency transformers.
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Stress-Strain Calculations of Selected Components of Firearm
Pavlík, Ondřej ; Ševeček, Oldřich (referee) ; Slažanský, Martin (advisor)
Thesis deals with the utilization of the finite element method (FEM) in development of computational model. Subject of the computational model is the slide stop pin of the pistol CZ 75, designed and manufactured in Czech Republic by Česká zbrojovka Uherský Brod. The computational model describes strain stress analysis of the slide stop pin. The results of the analysis are subject to difficult sourcing of relevant and reliable input information. Based on stress strain analysis results, the safety factor of the pin was determined. However, the results are influenced a lot by input parameters selection. At the conclusion the summary of proposed further steps for computational model accuracy increase is proposed.
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Mathematical models of retention object of urban drainage
Pavlík, Ondřej ; Stanko,, Ing Štefan (referee) ; Pollert,, Jaroslav (referee) ; Prax, Petr (advisor)
This work deals with the use of 3D mathematical models of fluid in water management practice. Using 3D mathematical model was assessed retention tank Jeneweinova, which is situated on a sewer network of the city of Brno and is an important object of urban drainage. Retention basin designed to keep overflow from CSO chambers to Svratka and Svitavský náhon during storm events. Retention tank Jeneweinova is suitable for the assessment, because tank was designed bassed the Master Plan drainage of Brno using 1D mathematical model. Another factor was the physical model, which was build in LVV Vin FAST BUT. And finally, near the retention tank will be installed measurement on the sewerage network, which will be able to verify the results whitch has been predicted in this work. Mathematical model of retention tanks Jeneweinova was build in software FLOW-3D. FLOW-3D is a general purpose CFD (Computational Fluid Dynamics) software for flow of fluid in steady and unsteady mode and uses computational techniques to solve the equations of motion of fluids. This software is mainly used for the calculation of hydraulic fluids, gas flow and heat transfer simulations. Results from 3D mathematical model has been compared with the values in the physical and 1D mathematical model.
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Realization of the plastic holder of the car navigation
Pavlík, Ondřej ; Nohál, Libor (referee) ; Paloušek, David (advisor)
The goal of this bachelor´s thesis is suggestion and manufacture of the plastic holder of the car navigation. The literature retrieval part contains gathering of information about external holders of the car navigations and description of prototype manufacturing method. The construction part is an accompanying report of suggestion and manufacturing of the car holder. 3D CAD Model is created in parametric modeller via Autodesk Inventor Professional 2010. The holder is then made via Rapid Prototyping FDM technology.
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Jewishness as a question of personal identity and literary dispositions
Pavlík, Ondřej ; Topor, Michal (advisor) ; Wiendl, Jan (referee)
This thesis primarily explores the different ways of reflecting on Jewishness in Czech poetry published between 1923 and 1936. This is modelled on two interconnected levels. Firstly, the thesis documents the language of literary criticism at the time, especially in the thought-provoking reflections of Pavel Eisner. The prism of his and others' observations and propositions can be applied directly to poetic texts to evidence their second life and wider impact - their social echoes, auto/hetero-stereotypical reception, ethno-deterministic interpretations, and finally their inclusion in the lineage of "Jewish lyricism," which is not to be taken as a matter of course. This is verified against and expanded upon through interpretations of the collections of poems by Otokar Fischer (Hlasy), František Gottlieb (Cesta do Kanaán, Proměny, Bílý plamen), and Viktor Fischl (Jaro, Kniha nocí, Hebrejské melodie) - i.e., by those authors who made Jewishness an explicit theme of their lyrical expression (or part of their lyrical auto-stylization). This way, the thesis explores the ideas of the different spiritual dispositions of Jewish artists, attempting to answer how and in what relation to the original poetic production they were formulated. In other words, how the influence of the author's Jewishness on his...
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