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Intanke and exhaust manifold for racing engine
Chuchma, Ondřej ; Zháňal, Lubor (referee) ; Beran, Martin (advisor)
This Master’s thesis is focused on design and optimalization of intake and exhaust system of the C20XE engine. It is four-cylinder gasoline engine with stroke volume of two litres, which was produced by car company Opel. This engine is determined for Opel Astra F automobile, that is build for racing. For optimalization of dimension parameters there is used a Lotus Engine simulation software, which simulates one-dimension gas flowing in manifold. 3D CAD models are made in Pro ENGINNER software.
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Ellipsometry of Thin Films
Novotný, Zbyněk ; Navrátil, Karel (referee) ; Nebojsa, Alois (advisor)
Diploma thesis deals with ageing process of thin films of Co and Cu on Si substrate, prepared by the IBAD method. The process of film ageing, which depends on time of exposition to the atmosphere at room conditions, was investigated with spectroscopic ellipsometry (VIS+UV) and atomic force microscopy. In case of thin Co films, approximately four days long incubation period was observed. During this time period, a change in the optical parameters of the film occurs without a measurable change of the film topography. Using non-contact atomic force microscopy, a growth of the transitional film in the island growth regime was observed. During the ageing of thin Cu films, two stages of growth of the transitional layer were observed - nucleation stage and growth stage. Both of these time periods of the transitional layer growth show direct logarithmic dependence. Using non-contact atomic force microscopy, the growth of the transitional film was observed. Using atomic force microscopy in non-contact regime, time dependent measurement was done and the process of forming of one monolayer of the transitional layer was documented. Within the diploma thesis, a series of experiments on ultra high vacuum system were performed in order to investigate phase transformation of thin Fe films (22 monolayers) on Cu(100) stabilized by CO absorption. The transformation from fcc phase to bcc phase was induced by Ar+ ion beam bombardment with the ion energy in the range (0.5-4) keV. The process of phase transformation was observed by surface magneto-optic Kerr effect, Auger electron spectroscopy and low energy electron diffraction.
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Heat and mass balance model of unit for biomass combustion
Tomšů, Ondřej ; Pavlas, Martin (referee) ; Máša, Vítězslav (advisor)
This work deals with the creation of a mathematical model for calculating mass and energy balances of the energy units for utilizing the biomass combustion by computational software W2E and it is engaged in necking the validity of the balance model for the real technology unit for combustion different types of biomass. There are presented basic informations of balances and described the procedure how to solve balance calculations of energy units. Introductory part deals with biomass as a renewable energy source, which has a large potential in energy system. There are presented all its important parameters, its types, methods of treatment and utilization power production. Next chapters focus on biomass combustion devices, theirs classification and theirs technological principles. For the specific type of biomass boiler (of capacity 1 MW with movable, inclined grid) - here was created balance model. The choice of this equipment is preferred primarily by the fact that the middle capacity power boilers can be considered as the most suitable heat sources in terms of efficient combustion of biomass. Another motivation is a key objective of this work, which is creation of balance model of the unit which energy utilizes of biomass, which belong into this category of heat sources and is available for real measurements. There are presented the available computing systems for balance modeling with the preference of the analysis program W2E and MS Excel. They are verified as the best instruments for creation balance model at the practical chapter of this work. The main output of presented thesis is thus balance model developed in W2E program which has been compared and modified to the real characteristics of biomass boiler. For this purpose were used the archived data from previous measurements and new actual measurements, which focused on the acquisition of the missing operational data and verifying the reasons of variance of the model and real status. In the conclusion, there are evaluated the basic operating parameters of the technology in various operating states by W2E analysis model.
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Výzkum a implementace nových nástrojů pro předpovědi povodní a odtoku v rámci zabezpečení hlásné a předpovědní povodňové služby v ČR
Povodí Vltavy, státní podnik, Praha ; Český hydrometeorologický ústav, Praha ; Čekal, Radek ; Bercha, Šimon ; Šercl, Petr ; Kendlík, Tomáš ; Daňhelka, Jan ; Mašek, Ján
Zpráva uvádí výsledky projektu v rámci jednotlivých dílčích úkolů. DÚ 1 Výzkum vlivu vstupů ansámblových systémů pro pravděpodobnostní předpověď počasí na hydrologické modelování - testování předpovědi srážek v systému ALADIN/LAEF pro účely hydrologického modelování a propojení tohoto systému s hydrologickým modelem AQUALOG. DÚ 2 Vytvoření metodiky dlouhodobých pravděpodobnostních hydrologických předpovědí - implementace programu AquaESP pro povodí Otavy, Lužnice, Jizery a Vltavy nad VD Lipno. Byly připraveny konfigurační a datové soubory časových řad a parametry, které ovlivňují způsob simulace ESP. DÚ 3 Vyhodnocení využitelnosti výstupů pravděpodobnostních předpovědí ve vodohospodářské praxi - práce byly zaměřeny na možnost zpřesnění poskytovaných údajů o velikosti objemu vody ve sněhu. Pro testování bylo vybráno povodí vodního díla Švihov na Želivce. Je popsáno zajištění sběru kompletních informací o stavu sněhové pokrývky. DÚ 4 Vývoj robustní metody odhadu odtoku z přívalových srážek - byl uveden do provozu systém FFG-CZ, jehož hlavním výstupem je operativní informace o pravděpodobném riziku vzniku přívalové povodně na daném území (povodí). DÚ 5 Rozvoj metod pro stanovení a měření parametrů sněhové pokrývky vzhledem k potřebám hlásné a předpovědní povodňové služby - popis testování a provozu automatických stanic pro měření výšky a vodní hodnoty sněhové pokrývky. Jsou popsány výsledky měření. DÚ 6 Vytvoření průvodce povodňovými riziky pro potřeby povodňových orgánů a veřejnosti - zpráva s aktivními odkazy je k adrese: http:/www.chmi.cz/files/portal/docs/poboc/CB/pruvodce/pruvodce.htm.
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Crank mechanism of a gas V-sixteen engine
Čep, David ; Novotný, Pavel (referee) ; Píštěk, Václav (advisor)
Diploma thesis is trying to analyze crank mechanism of a gas V-sixteen engine. Kinematics and balance crank mechanism are analyzed, dynamic model parameters are dermined, natural frequency of the torsional system are calculated, coupling parameters are designed and torsional problem with attached electric generator is analyzed.
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Power control of combustion engines
Slavík, Tomáš ; Beran, Martin (referee) ; Zháňal, Lubor (advisor)
The main subject of this dissertation is a comparison between different methods of controlling the output in compression and spark ignition engines in light of economic- ecological parameters, effects on engine functioning as well as vibrations. Main types of power control, their principle, advantages and disadvantages are presented in the text. There are several comparative simulations described and presented at the end of this work that were created by using a multi-body system. Calculation of parameters and simulations were selected to approximate resulting values to real values as much as possible.
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