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Mathematical model of the 1.5TSI engine
Michalička, Matúš ; Beran, Martin (referee) ; Svída, David (advisor)
This bachelor thesis deals with the creation of a mathematical model of an internal combustion engine in Matlab or Simulink using built-in libraries. The thesis also includes a detailed analysis of two already created models, which are found in the examples of the program used. The analysis summarizes the different approaches to the creation of mathematical models, their possibilities, and the method of calculation. The thesis further deals with the construction of a mathematical model of an internal combustion engine. The development of the model is followed by measurements done on a specified 1.5 TSI internal combustion engine. Finally, the simulation results of the developed model are directly compared with the measurement results.
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Mathematical model of the mass of the intake air into the internal combustion engine
Sikarenko, Ivan ; Beran, Martin (referee) ; Svída, David (advisor)
The thesis presents a study of the creation of a mathematical model of the mass of air intake into an internal combustion engine using MATLAB Simulink environment. To achieve this objective, existing methods of measuring the mass of the flowing air were studied and analyzed, of which the method based on the use of the volumetric efficiency map proved to be the most suitable. Experimental data was obtained on a test bench, then the measurement results were correctly interpreted to build a model in MATLAB Simulink environment. The model validation showed that the maximum deviation of the calculation from the MAF sensor data is 2.4%, however, the accuracy of the model can be improved by performing further tests to complete the volumetric efficiency map.
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Analysis of the Problem of a Cyclic Pursuit
Kučerová, Vendula ; Tomášek, Petr (referee) ; Čermák, Jan (advisor)
This bachelor's thesis analyzes the problem of cyclic pursuit. It deals with the characterization of cyclic pursuit problems and describes how the theory of differential equations is employed in this area. The formulation of a mathematical model is emphasized, followed by its exact solution and further analysis supported by graphical visualization of the obtained solutions.
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Design calculation of heat exchanger for cooling of aggressive substances
Kůra, Tomáš ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
This thesis focuses on the design of a coaxial tube in tube heat exchanger. First, the existing methods of cooling of aggressive substances are presented. Subsequently, the compatibility of the heat exchanger materials with substances used in the semiconductor industry is addressed and the PFA polymer is presented in detail as a suitable material. The paper further explains heat transfer, both in general and specifically in heat exchangers. Not only the relationships commonly used in heat exchanger design are presented, but also equations for coaxial heat exchangers. The individual empirical equations are compared with measured data, and on this basis, the most appropriate relations are chosen to describe the processes in the exchanger under investigation. Then, the work describes the operation of the developed program in VBA, which includes thermal and hydraulic calculations and strength control.
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Computational prediction of operating parameters of cogeneration units
Kašpar, Jakub ; Daxner, Ján (referee) ; Jegla, Zdeněk (advisor)
The focus of this work is on gas-fired combined heat and power (CHP) units with internal combustion engine. The aim is to present and analyse a prediction model with subsequent modification and experimental validation. This is preceded by a proper theoretical introduction to CHP units. First, the role of CHP in the transformation of the contemporary energy sector, which is under increasing demands, is outlined. Next, the types of CHP units are briefly introduced, including their advantages. This is followed by a detailed description of their design together with the factors influencing their operating parameters. For the understanding of the subject, emphasis is placed on the description of analytical relations in the field of thermomechanics and physical chemistry. Furthermore, the modelling of CHP is approached based on knowledge gained during the study and work experience in the field of CHP units. The final adjusted predictive model shows deviations of up to 12 % with respect to the nominal parameters. When validated with experimental data, it shows a deviation of up to 31,1 %. In general, the model is not suitable for accurate prediction of operating parameters. However, it has been successfully validated in determining the trend of the dependence of the operating parameters on the hydrogen concentration in the fuel.
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Coupled model of DC machine
Komorous, Jan ; Kraml, Aleš (referee) ; Vlach, Radek (advisor)
This thesis focuses on the creation of a DC motor model with an emphasis on the interconnection of individual domains and subsequent comparison with real behavior. In the first part, the model is created using equivalent substitute diagrams for the electrical, mechanical, and thermal parts. In the second part, the implementation is carried out using MathWorks software, along with the creation of a missing block for heat transfer by natural convection. The resulting behaviors are compared with a real DC motor.
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Model of Test System 300 kV
Bukva, Michael ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The aim of this thesis is to analyze and evaluate an alternating current testing system with a voltage of 300 kV, located at Professor List's Science and Technology Park. The work focuses on describing the construction of this system, its functional parameters, and its practical application for various types of high voltage tests. A key aspect of the analysis is the assessment of the quality of the output signal from the source and the identification of factors contributing to total harmonic distortion (THD) and crest factor (CF). The study examines the impact of transformer design features, temperature, switching currents on harmonic distortion. Based on the measured values, optimal operating conditions were defined and mathematical models were developed to predict the system's behavior under various operating conditions. The results of this work also include software that serves as support for the operators of the testing system.
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Concept design of a multi-environment mobile robot
Zezula, Benjamin ; Burian, František (referee) ; Kopečný, Lukáš (advisor)
This thesis presents the design of a multi-enviroment mobile robot that combines the simple principle of movement both in water and on land. In particular, the design of a~four-wheeled vehicle is presented, whose innovation lies in the use of blades on the rear wheels. A suitable type of propulsion system is chosen based on a~study of~different types of~robots. During the research of already functional solutions, great emphasis is put on the advantages and disadvantages of~the different actuators as well as their mathematical and physical analysis. The proposed solution includes the proven design of four differentially controlled wheels for movement on land and the use of~blades on the rear wheels for movement in water. This concept is described in detail using a~mathematical-physical model, on the basis of~which a~working prototype has been developed. The thesis concludes with an experimental verification of~the agreement between the mathematical model and the real prototype. This verification focuses on the motion dynamics and the behaviour of the robot in different environments. The differences observed are attributed to external influences such as the resistance of the gears or the manufacturing tolerances of the individual components.
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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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