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Inverters for lighting units with LEDs
Zuber, Zalán ; Feiler, Zdeněk (referee) ; Klíma, Bohumil (advisor)
The master‘s thesis deals with DC/DC converters for power LED diodes. Gives an overview of the field of LED lighting technology, analyzes various types of converters and shows their principle of operation. Furthermore presents some possible circuit designs for three different voltage levels and the calculations for each part. As an approval of their functionality the results of their measurements are plotted followed by the data evaluation.
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Intelligent charger for Pb accumulators
Hadwiger, Tomáš ; Šebesta, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor project deals with lead accumulator charging. The properties of this acumulator charger are described here and the best possible way of charging has been based on these properties. The capacity of the accumulators has also been taken into account. The charger itself is able to distinguish between the twelve-volt and the six-volt accumulator. The charger prevents accumulators from overcharging and does not charge damaged ones.It also contains the protection against reversing polarity. The project contains complete scheme, DSP layout, lists of components and their placement on the DPS. The design of the transformator suitable for the charger is also included.
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Hole punching problematics of two layered sheet metal
Kvapil, Štěpán ; Peterková, Eva (referee) ; Císařová, Michaela (advisor)
The thesis is focussed on project of a tool – a hot working clipping punch, where the hole is punched in the upsetting ends of stabilizer. We talk about punching of a two layered semi-finished product, in which burr is formed at the layer interface, which is undesirable from the point of the customer requirement. The stabilizer is mounted in the car chassis, where it is fastened to the axle with screws. The literature study is focused on the theory and problems of punching. In the practical part, several design solutions of cutter faces are discussed, from which three types of face shape were selected. This was associated with a change in the design of the ejector. Two tool materials were selected for comparison. The cutters were tested on an automatic forming centre. Finally, after summarizing and evaluating all the practical experiments, an optimal solution of a tool designed for punching a hole with a two layered semi-finished product is proposed.
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Membraneless speaker
Kovář, Josef ; Šteffan, Pavel (referee) ; Pavlík, Michal (advisor)
The bachelor thesis consists of theoretic basics and describes the design and construction of one-channel membraneless speaker. Absence of mechanical components gives the membraneless speaker no frequency limitation. The design consists of power source, control electronics, which modulates the signal, convertor and output transformer. The power source is realized by transformer, which lowers the voltage and stabilizators. Modulation is provided by integrated circuit TL 594, its duty is adjusted by potentiometer P1 and frequency by potentiometer P2. Power conversion provides dual forward converter. As a output transformer was used transformer from color television.
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Tail units design of VUT 100 aircraft made out composite
Berka, Martin ; Cejpek, Jakub (referee) ; Mališ, Michal (advisor)
This Master´s thesis describes the design of composite horizontal tail of VUT 100 aircraft. Load calculation and selection of the critical load cases is performed. Internal structure of stabilizer and right elevator is designed. Construction materials are chosen and the structure of the composite materials is proposed. FEM models of stabilizer and the right elevator are created in MSC Patran system and consequently the strength test of the models for the selected load cases is executed using MSC Nastran software and COMPOST.
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Design of Racing Car Front Suspension
Kroliczek, Václav ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This work deals with design of front trapezoidal suspension for racing car Škoda 130RS. The first part describes types of current suspensions and provides a review of important suspension parameters that have great influence to vehicle handling. The second part deals with kinematic analysis existing suspension, its modification and design of new type.
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Design of vehicle suspension stabilizer
Macháček, Tomáš ; Ramík, Pavel (referee) ; Porteš, Petr (advisor)
Tato diplomová práce je zaměřená na stabilizátory u podvozku aut. První část popisuje všeobecné znalosti vlivu naklonění karosérie na jizdní vlastnosti auta a možnosti konstrukčních řešení používaných v praxi. Dále jsou v této části uvedeny nevýhody použití stabilizátoru a jejich náhrady. Nasledující téma se zaměřuje na soutěž Formule Student a její všeobecná pravidla. Hlavní částí této práce je analýza stabilizátoru Formule Ford, na kterou v poslední části této práce navazuje analýza předního a zadního stabilizátoru Formule Student. Byly vytvořené kompletní MBS modely pro přední a zadní zavěšení včetně stabilizátoru. Díky těmto modelům bylo možné provést výpočty klopných tuhostí a pevnostní výpočty. Z těchto výpočtů bylo možné určit vhodné nastavení stabilizátoru. Všechny modely mohou být dále použitelné pro analýzu jízdních vlastností příslušného vozidla.
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Study of Belite Structure and Stability
Adameková, Paulína ; Kalivoda,, Karel (referee) ; Gazdič, Dominik (advisor)
This diploma thesis deals with the preparation of clinker mineral belite. The aim is to optimize the preparation of belite followed by monitoring the influence of side oxides, the preparation process and also the firing on the stability of ß - C2S. The work focuses primarily on the preparation of ß - C2S without stabilization, based on previous research in the field of clinker minerals at the ÚTHD, where the results showed a recovery method for preparation of raw material mixture and optimization of suggested firing modes.
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Electronically Controlled Anti-roll Bar
Drozd, David ; Vančura, Jan (referee) ; Blaťák, Ondřej (advisor)
The topic of this master’s thesis is electronically controlled anti-roll bar. The first part describes the effect of body roll and anti-roll bars on vehicle characteristics, as well as an overview of currently used systems for active stabilization. The second part analyzes simulations of various driving scenarios in a multibody software in order to evaluate the effect of anti-roll bars with various stiffness on driving characteristics of vehicles. The numerical data obtained from simulations are applied in later part of the thesis. The design concept of an active stabilization system is explained in the third part. In the last part, the effect of key parameters on the performance of the system is determined.
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Battery supplied lawn mower
Picmaus, Jan ; Martiš, Jan (referee) ; Vorel, Pavel (advisor)
The thesis deals with a concept of turning a conventional petrol powered lawn mower to a battery powered solution which is powered by lithium cells. A division to three chapters, comparison, mechanical and electrical, provides fluency of the whole design and further realization. The arrangement of chapters is performed so that the continuity of the thesis is maintained. Calculations of parameters of every motor and transmission with choosing particular devices are just a part of much interesting information which can be found in this thesis. All new components have full documentation except those which were changed during manufacturing. The electrical part explains every part of the schematics in detail. The realization contains difference between preliminary design and further production, manufacturing of the PCB and powering up the motor drives. The last part of the thesis contains temperature measurements of the device at no load.
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