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Contactless loading and measurement of high-speed machines
Vojče, Zbyněk ; Ondrůšek, Čestmír (referee) ; Vítek, Ondřej (advisor)
Práce se zabývá problematikou měření momentu u velmi vysokootáčkových strojů. Z důvodů vysokých rychlostí jsou tradiční metody měření momentu nepoužitelné, z tohoto důvodu je nutno vyvinout novou bezkontaktní metodu. Pro měření je zvolena metoda zatěžování vířivou brzdou, pro kterou je proveden analytický výpočet jejích vlastností pomocí Maxwellových rovnic a je vytvořen model vířivé brzdy v programu FEMM a Ansys/Maxwell 2D. Na závěr jsou výsledky simulací a výpočtů porovnány s měřením na prototypech brzdy.
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Model of controllable current amplifier based on diamond transistors and voltage amplifiers
Kos, David ; Jeřábek, Jan (referee) ; Šotner, Roman (advisor)
This thesis is focused on modelling of controllable current amplifier based on voltage controllable amplifiers and diamond transistors. In a first part of the thesis, principle of modelling of diamond transistor and features of diamond transistor OPA860 are discussed. Furthermore, there are discussed features of amplifiers with controllable voltage gain (VCA810 and LMH6505) with main focus on their gain. These amplifiers are used for modelling the current amplifiers. In the next parts there are analyzed of the proposed models and verification of the simulations. The functionality of the models is verified by practical measurements and results are compared with the simulations. In conclusion of the thesis, there are examples of simple applications.
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Square type fractal antenna
Roháček, Peter ; Všetula, Petr (referee) ; Hebelka, Vladimír (advisor)
The bachelor thesis deals with analysis of fundamental parameters of antennas and methods of fractal construction. Attention is turn on microstrip antennas, where are discussed the basic properties, the pros and cons, methods of construction, power options and a demonstration of the theoretical proposal. These supporting documents were used for the actual design and optimization of the square fractal antenna in CST Microwave Studio program, which was subsequently implemented.
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Special low-power induction motors.
Belica, Andrej ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
Master thesis deals with design and construction of the most widely used engines currently. Overall, it is divided into five chapters, the first chapter deals with constructional features of various three-phase asynchronous motors, the second chapter briefly paid attention to single-phase motors. The next chapter focuses on the specific engine types, which differ from standard induction motors in its design implementation. This is an engine with full rotor, hysteresis, linear and with shaded field. Although asynchronous motors are considered the most reliable machines work in imperfect conditions, it leads to frequent breakdowns. This is covered in chapter four. Based on the findings from previous chapters the fifth chapter includes a preliminary draft of the asynchronous motor with a full rotor. The last chapter is devoted to the measurement on functional models.
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Analysis of human tremor by using hight speed camera
Kuder, Zenon ; Čmiel, Vratislav (referee) ; Rychtárik, Milan (advisor)
This thesis investigates the possibility of using the Olympus iSpeed 3 high-speed camera and light-emitting diodes in visible light spectrum to analyse human tremor of upper limbs. Moreover, it discusses possible realization of a measurement apparatus including software implemented in the Matlab environment. The system is then tested on a small sample of healthy subjects.
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Electronic tester of capacity and internal resistance of batteries and accumulators
Machala, Pavel ; Kubánek, David (referee) ; Lattenberg, Ivo (advisor)
This work deals with the design and realization of electronic tester of capacity and internal resistance of galvanic cells. In the begining is situated the familiarization with basic concepts and features of galvanic cells. There are also described appropriate methods for measuring capacity and internal resistance. These principles are aplied into the design of electronic tester which is described in detail in the next chapter. The designed device is controlled by a microprocessor chip ATmega16, whose software is thoroughly described in the second part. In the end you can find the results of testing and assessment of these tests.
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Company Performance Measurement
Galanská, Zuzana ; Hanzel, Jaroslav (referee) ; Bartoš, Vojtěch (advisor)
This master`s thesis deals with the performance measurement of Stredoslovenská energetika, a.s. The first section explains what performance is and describes the theoretical basis, which relates with the methods of measurement and analysis of the company’s current state. In the following part there is the profile of the company with its current situation. The evaluation of the performance SSE, a.s. is measured by START PLUS model. This model identifies the strengths and the areas which need improvement and offers suggestions for improving the company’s performance.
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Design and realzation of electric measurements on biological tissues
Kocová, Lucie ; Palai-Dany, Tomáš (referee) ; Tománek, Pavel (advisor)
This master’s thesis is focused on the electrical properties of biological tissues and flesh in particular. Their electrical characteristics depend on the physical and chemical parameters that determine the concentration and mobility of ions in metabolic fluids. From the electrical point of view, flesh can be simply substituted by a field of elongated conductive cells which are separated by the insulating membrane from each other. In the next part, the Fricke model is introduced. The model describes the measurement of impedance of the tissue at low and high frequencies. The aim of the work is to assess how the impedance of the dielectric sample is dependent on the frequency of the electrical signal during the optimal aging or ripening of flesh.
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Optoelectronic sensor of polarization state of light from biological samples
Mikláš, Jan ; Brüstlová, Jitka (referee) ; Tománek, Pavel (advisor)
The living body tissues consist of cells which dimensions are bigger than a wavelength of visible light. Therefore a Mie scattering of reflected of backscaterred light occurs and different polarization states arise. The changes of polarization state due to the multiple scattering of light in the biological cellular tissues allow measure the aging of biological tissue. The reflected or backscattered polarized laser light exhibits multiple scattering on the sample surface and in its subsurface area.
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Ballistic pendulum
PEŠEK, Milan
The subject of my thesis is ballistic pendulum. I am describing here not only the function and the physical characteristics of this device but also I am proposing experimental procedures of tasks that can be measured. Then these tasks are processed and evaluated. Furthermore, the above mentioned device will be available to students for any kind of experiments.
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