National Repository of Grey Literature 8 records found  Search took 0.00 seconds. 
Sensitivity Analysis Of An Induction Machine With A Solid Rotor
Bílek, Vladimír
The main focus of this paper is to show the results of sensitivity analysis of an inductionmachine with a solid rotor. For the case study, a three-phase induction machine with a squirrel cage ischosen. However, the rotor of this machine is replaced with an axially slitted solid rotor. The electromagneticmodel is analyzed by transient simulation using the FEM-based program Ansys maxwell.For the sensitivity analysis, several parameters are changed in a wide range to see the difference inthe machine overall performance. Some of the results of these simulations are shown and discussedat the end of this paper.
Electromagnetic analysis and modeling of a solid rotor induction machine
Bílek, Vladimír ; Vítek, Ondřej (referee) ; Bárta, Jan (advisor)
Tato diplomová práce se zabývá elektromagnetickou analýzou a modelováním asynchronního stroje s plným rotorem. Tato práce tedy zahrnuje literární rešerši na téma vysokootáčkových elektrických strojů s porovnáním s klasickými elektrickými stroji s převodovkou a popisem jejich výhod či nevýhod, rozdělení vysokootáčkových elektrických strojů s plnými rotory a srovnání jejich výhod či nevýhod, kde se tato práce nejvíce soustřeďuje na vysokootáčkové asynchronní stroje s plnými rotory a jejich použití v průmyslu. Dále se tato práce zabývá metodami výpočtu elektrických asynchronních strojů s plnými rotory. Proto jsou zde uvedeny a popsány metody výpočtu stroje mezi které patří analytické metody i metoda konečných prvků. Vzhledem k povaze elektrických strojů s plnými rotory je hlavně kladen důraz v této práci na výpočet stroje pomocí metody konečných prvků ve 2D prostoru s využitím korekčních činitelů konců plných rotorů, které jsou zde velmi detailně popsány a rozděleny. Na základě dostupné literatury je vypočítaný elektrický stroj s plným rotorem pomocí MKP analýzy. Elektromagnetický výpočet stroje je automatizován pomocí skriptu vytvořeného v Pythonu. Dalším hlavním cílem této práce je popis tzv. náhradních modelů, uvedení jejich výhod či nevýhod, použití v jiných průmyslových odvětvích a hlavně použití náhradních modelů na elektrický stroj s plným rotorem. S využitím náhradních modelů je dále optimalizovaný vybraný asynchronní stroj s plným rotorem a to pomocí programů SymSpace a Optimizer. Pro samotnou optimalizaci byly uvažovány 3 návrhy stroje, které byly na závěr mezi sebou porovnány a to hlavně z hlediska jejich elektromagnetického výkonu.
Time-Harmonic Analysis Of An Induction Machine By Open-Source Software
Bílek, Vladimír
The main focus of this work is to show simulation capabilities of open-source FEM program ELMER. In this case the simulated electromagnetic model is three-phase induction machine which is solved with time-harmonic analysis. The results of simulation are afterwards compared to time-stepping analysis and measurements of real induction machine with same properties and disscused in the end. The desired results of this work is to show ELMER as a possible replacement for paid simulation programs.
Electromagnetic calculation of an induction machine using an open source program
Bílek, Vladimír ; Mach, Martin (referee) ; Bárta, Jan (advisor)
This bachelor thesis deals with issues of finite element method and its use for electromagnetic calculation of induction machine. The first part of the thesis deals in details about finite elementh method, where the thesis describes the procedure of calculation of electromagnetic model and its use in simulation software. The second part contains and compares the list of paid and open-source simulation programs. The third part describes the creation of the specified electromagnetic model. The fourth part of thesis represents program ELMER, program's posibilites and how to set up scripts for simulation. The fifth part compares simulation results with measurments on real induction machine. The last part is the overall evalution of the thesis.
Pupils' Problems and Mistakes when Manipulating Algebraic Expressions
Bílek, Vladimír ; Vondrová, Naďa (advisor) ; Žalská, Jana (referee)
The thesis focuses on mistakes and problems in manipulations with the algebraic expressions occurring to pupils at the second level of Elementary school. The thesis is divided into a theoretical and experimental part. The theoretical part contains description of manipulations with algebraic expressions, selected results of international comparative surveys, and an analysis of related foreign research. Analysis of three series of textbooks, according to which pupils involved in the experimental project are taught, is essential for understanding of possible origins of their mistakes. The classification of mistakes in manipulations with algebraic expressions is included. At the core of the work is the experimental part aiming to identify problems and mistakes of pupils when manipulating and working with algebraic expressions. The participants of the research consisted of six third-grade pupils of an eight-year Grammar school (13-14 years old) and eight ninth-grade pupils of an Elementary school (14-15 years old). Test used for my experiment came from the GA ČR project Critical parts of mathematics in primary school. The investigation was carried out individually with each pupil by the method of monitoring clinical interviews over the solution of the test tasks. The obtained data was qualitatively...
Public swimming in the region Strakonice
Bílek, Vladimír ; Chrzanowská, Babeta (advisor) ; Čechovská, Irena (referee)
Title: Public Swimming in the Region of Strakonice Objectives: The aim of the thesis is to assess and compare the usability of the swimming premises in Strakonice in the framework of the operating hours for the public in 2002 and 2012. Furthermore, it is to characterise current attendees of the indoor swimming pool, to evaluate and interpret the development of their attendance, and to assess the contentment of the public regarding the operation and the opening hours. Methods: The comparative method has been used in the case of the comparison of the attendance of the swimming premises in Strakonice in 2002 and 2012. The data collection has been done using the questionnaire method. The mathematic-statistical method has been used to process the received data. A graphical and tabular representation has been used to simplify the visual analysis of the data. Results: It has been ascertained that the usability of the swimming premises in Strakonice in the framework of the offered opening hours for the public was lower in 2002 than in 2012. From the point of view of the character of the current swimming public the number of men and women is equal, the residence of the attendees is mostly Strakonice and close surroundings, and most attendees are between 31 - 45 years old. The public attending the swimming...
Floor function and fractional part of the real number
Bílek, Vladimír ; Novotná, Jarmila (advisor) ; Pilous, Derek (referee)
The aim of my bachelor thesis is to acquaint the reader with the floor function, ceiling functions and with fractional part of the real number, and show the feasibility of selected equations of one unknown that contains the floor functions of the real number. In the introductory part of my thesis, necessary concepts, notations and definitions of these functions are defined. The main part of the work is devoted to a description of strategies for finding solutions to following four types of equations: , and . Derived general procedure for solving the first equation and a description of the strategy for finding solutions to the remaining three equations are the greatest benefits of my thesis. The procedures are demonstrated by examples in each chapter. The final section covers some types of unsolved problems from different areas of mathematics concerning this topic.

See also: similar author names
3 Bílek, Vlastimil
4 Bílek, Vojtěch
2 Bílek, Václav
2 Bílek, Vít
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