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Aerodynamic components of passenger cars
Petrskovský, Adam ; Vančura, Jan (referee) ; Vondruš, Jan (advisor)
This bachelor thesis is focused on aerodynamics of the cars. Theories on aerodynamics characterizations as well as force exertions are presented here. Moreover, the influence of aerodynamics on fuel consumption and formation of harmful emissions is described. The thesis also provides a comprehensive overview of particular aerodynamic devices used on cars. Furthermore, CFD simulations of four aerodynamic devices on a simplified model of car are included. The results of these simulations are then evaluated and the respective aerodynamic devices are subsequently compared to find out which of them has contributed the most to the improvement of aerodynamic characteristics of the vehicle.
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Modern Cooling Concepts of Electrical Machines
Lukášek, Jan ; Cipín, Radoslav (referee) ; Toman, Marek (advisor)
The thesis focuses on the research of modern concepts of cooling of electrical machines. The first part of the thesis deals with the origin and calculation of losses causing heating of electrical machines. The second part describes the mechanisms of heat transfer and basic relations of fluid mechanics. The third part describes the basic principles of cooling of electrical machines. The final part of the thesis describes modern concepts and innovations in cooling systems for electrical machines described in the third part and separate modern innovations.
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Measuring RLC on the components of electrical circuits
Pokorný, Marek ; Vítek, Ondřej (referee) ; Veselka, František (advisor)
Aim those work is inform numerator about possibilities and features gauging apparatus 7600 Precision LCR undergrounds and further then about metering paramers R,L,C on components electric standing ,especially then on sliding contacts,with which this work acquaint and how are their characteristics important for correct functionality electrical machine whereof are site rated power.Warp work largely start from manual to apparatus 7600 Precision LCR undergrounds and further then out publication sliding contact in electrical machine - doc. Veselka, doc. Chmelik.
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Electronic RLC meter
Dvořák, Radim ; Hanák, Pavel (referee) ; Lattenberg, Ivo (advisor)
This work deals with measurement methods of passive components R, L ,C used almost in every electrical circuit. Work describes progress of choosing the right methods for measurement and also the process of designing the autonomous RLC meter with use of ATMEL microprocessor chips. The RLC meter will be powered from rechargable battery and will be able to measure primary attributes of RLC components.
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Harness tester
Smola, Tomáš ; Bohrn, Marek (referee) ; Pavlík, Michal (advisor)
This thesis deals with issue and construction of wire harness tester. In the first place, is this thesis focused on market exploration and comparison of comercial testers with concrete requirements for small batch production. I will try to find a suitable product in worldwide market, which would be convenient for company producing construction machinery. For testing switchboard harness we need to test interconnections between connectors, resistors, relays, diodes, transils and switches in the dashboard. If I can not find some product, I will try to design some new tester. My priorities will be testing all components in harness, maximum flexibility of tester for the future trends in contruction of rollers and user friendly control.
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Dynamic simulation of DC motor using FEM
Gottwald, Michal ; Huzlík, Rostislav (referee) ; Vítek, Ondřej (advisor)
My diploma thesis deals with a specific dynamic model of DC motor with the parameters obtained from the calculation and from the program using the finite element method. It shows how much accurate results can be achieved in the model, if you use only the values which can be measured, recorded and calculated on the engine. This thesis contens three parts. First part describes the structure and function of DC motor and the basic principle and the use of FEM. Next is calculation analytical and numerical parameters. The search parameters include torque, resistance and inductance of armature winding, resistance and inductance of excitation windings. The last part is dedicated to creating a dynamic model. Results from the dynamic model and measured values are compared in the conclusion of my thesis.
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Flight performance of the STOL light sport airplane
Koudelka, Jaroslav ; Sklenář, Filip (referee) ; Juračka, Jaroslav (advisor)
The aim of this bachelor thesis is to evaluate effect of individual parts of the selected aircraft on its aerodynamic characteristics and to summarize possible directions of aircraft modifications with taking into account increasing its cruising speed while maintaining STOL performances. The first part of this thesis is focused on the description of selected aircraft construction and its legislative categorization. Then follows the theoretical part describing the basic terms of horizontal flight mechanics, the creation of drag and drag types. The practical part contains the evaluation of the drag influence for individual aircraft parts, their possible directions of improving and the final summary how the modified parts influence flight performances. In conclusion they are results comparing the original aircraft configuration with the modified one with taking cruising speed into account. For the modified version there is an evaluation of its impact on the STOL performances.
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Single-Phase Induction Motor
Vácha, Pavel ; Lapčík, Josef (referee) ; Hájek, Vítězslav (advisor)
The bachelor work is concerned the thesis of a single-phase induction motor that´s perpetually more used in all over the world. Its aim is assembling the information about this type of motor and its calculation. The content of the first part is the theoretical analysis of a single-phase induction motor and acquirement ways of the stroke moment. The practical part contains a basic schema calculation of the single-phase induction motor with an auxiliary phase and a processing demonstrate example of calculation of the single-phase induction motor with concrete parameters along suggested process. In the conclusion there is the evaluation of the whole process.
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