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Creation and analysis of electrical machines parametric models at CAD systems.
Chmelíček, Petr ; Janda, Marcel (referee) ; Kuchyňková, Hana (advisor)
Aim of this bachelor’s thesis is to demonstrate facilities of computer aided design on practical tasks. First part contains description of Autodesk Inventor, which is one of the most important modern parametric CAD systems. There is described the basics of modeling, drawing creating and analysis of design. Second part is oriented on demonstration of capabilities of Ansys Workbench, which is important system for solution of engineering problems by the finite element method. Also there is description of user interface of Ansys, analysis of electromagnetic field in asynchronous motor and description of one phase asynchronous motor. Task of last part is to create animated presentation of asynchronous motor with outer rotor in Inventor studio.
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System for automatic evaluation of email messages
Frkal, Jan ; Červenka, Vladimír (referee) ; Koutný, Martin (advisor)
This diploma thesis deals with the design and realisation of system for automatic evaluation of e-mail messages. The system works with PHP language and MySQL database. It also allows automatic synchronisation. During the synchronisation e-mail messages are downloaded and saved using IMAP or POP3 protocol. Subsequently, the messages are analysed. During the analysis the reports are classified into types, according to pre-defined keywords. The system also works with black lists and white lists. If the sender of an e-mail is during the synchronisation found in the blacklist, that e-mail will be skipped. On the contrary, if the sender of an e-mail is found within the white list, that e-mail will be excluded from keyword matching and from the list is type and category loaded. Most of the values from the carried out evaluation of the e-mails can be clearly seen in advanced statistics. Pie charts and numerical statistics are available. Access to the system is protected by a login. Therefore, login can only registered users.
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Analysis of the Speed of Cyclists Aged from 10 to 15 Years
Valentová, Hana ; Semela, Marek (referee) ; Bradáč, Albert (advisor)
The thesis is concerned with an analysis of speed of bicyclists in age between 10 and 15 years. The thesis examines differences in construction of children's bikes, describes relationship between a child and a bicycle, messures size of children's bikes and characterizes the procedure during an analysis of bike accidents. Internal parts of the thesis are statistical data from accident frequency and summarizing of actual state of understanding of following problems in this age category. The main purpose of this thesis is to make an analysis of speed for individual age categories and make an evaluation of results. This measurement will be completed by a measure of achievable brake deceleration of riders in age between 10 and 15 years. The purpose of this final thesis is an expansion of data for a forensic expertise in area of Traffic.
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Signal processing and receiving in UMTS system
Hron, Michal ; Hanus, Stanislav (referee) ; Kejík, Petr (advisor)
This semestral thesis be concerned with datailed analysis of receiving and processing signals in UMTS network system. Insistence of this work is setting to principals of RAKE receiver and processing signals in CDMA networks downlink channel. Through development system MATLAB simulates real function of RAKE receiver. This project is giving fundamental knowledges about receiving and processing of multipath signals to readers.
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Rotor design of a Line-Start Synchronous Reluctance Machine for Industrial Applications
Žíla, Jakub ; Knebl, Ladislav (referee) ; Bárta, Jan (advisor)
This diploma thesis deals with design of rotor of synchronous reluctance machines. There is a theoretical description of rotor geometry of synchronous reluctance machine that respects natural flow of magnetic flux inside complete rotor. The parametric model of rotor is made with usage of ANSYS Maxwell and Matlab software. Furthermore, the parameters of the machines are confirmed using the same program. Finally, changes of motor parameters are observed in connection with different rotor geometries.
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Analysis of the Lifestyle of University Students in BUT
Klíma, Josef ; Muchová, Marta (referee) ; Lepková, Hana (advisor)
The bachelor’s thesis focuses on the analysis of the lifestyle of university students. Considers their habits of the lifestyle, exercising physical activities and the habits of alimentation. Specifies the theoretical findings of the healthy lifestyle and compares them with the results of the research among the university students in period between January 2013 and November 2013.
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The optimum supply of a wound-rotor synchronous machine with respect to maximum efficiency
Laštovička, Josef ; Cipín, Radoslav (referee) ; Bárta, Jan (advisor)
Tato diplomová práce se zabývá literární rešerší elektromotorů, které je možné použít pro pohon elektrických vozidel, přičemž hlavní pozornost je věnována strojům s vinutým rotorem. Na začátek je proveden krátký popis konstrukce a principu činnosti každého vhodného typu elektrického stroje. Jsou zde shrnuty výhody a nevýhody použití stroje jako trakčního pohonu a případné použití v dnešním elektromobilu včetně základních specifikací. Dále je věnován detailnější pohled na stroj s vinutým rotorem a jeho použití pro pohon elektrických vozidel. Následná část práce se věnuje úpravám tohoto typu stroje pro použití v trakčních aplikacích. Je zde představen stroj, který je schopen provozu ve dvou módech, následně je diskutován bezkontaktní přenos proudu do rotorového vinutí a nakonec je představena možnost použití tvarovaného vinutí z vodičů obdélníkového průřezu. Předposlední část práce se zabývá matematickým popisem stroje včetně náhradních schémat v podélné a příčné ose a vysvětlením vektorového diagramu v motorickém režimu. V posledních dvou kapitolách práce je představen program v jazyce Python, který slouží k analýze provozních charakteristik stroje. V rámci práce na programu byla vytvořena metodika analýzy tohoto typu stroje na základě poskytnutého balíčku dat. Dále byly vyexportovány grafické závislosti momentu a účinnosti na různých kombinacích vstupních proudů. Součástí programu je také funkce pro hledání optimálního napájení stroje s ohledem na nejvyšší účinnost.
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Simulation of earthing system resistance measurement
Pirochta, Josef ; Topolánek, David (referee) ; Vyčítal, Václav (advisor)
In this bachelor thesis, the effect of different soil models and random wire placed underground on the results of earth resistance measurements using the 4-pole method was investigated. To determine this influence, simulations were performed in Ansys Electronics software, in which different soil models (with local inhomogeneity, horizontally divided soil and soil divided at an angle) were created. In these models, the measured earth was placed together with the measured random wire and its resistance was determined by simulating the measurements and with respect to the distant ground. The effect of the different soil models on the accuracy of the measurements was determined from the differences in the resistance of the earth random wire obtained by measurement and with respect to the distant ground. It was found by simulations that, of all the variants investigated, performing measurements in the presence of different soil models and a random wire can lead to a measurement error of up to 7,2 %.
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