National Repository of Grey Literature 54 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Proposal of topology of piezoceramic composite sensor
Dostal, Vojtěch ; Ševeček, Oldřich (referee) ; Majer, Zdeněk (advisor)
This master thesis deals with design and numerical modelling of piezoceramic sensor, which is placed on a rail, in order to generate electrical energy, which can be used for wireless monitoring of railway traffic and to monitor the condition of the railway. The thesis is divided into three parts. Theoretically background of piezoelectric energy harvesting is described in first part, where some previous application of piezoelectric generator in railway area are shown. In the second part, parametric analysis of numerical model is performed, which directly leads to finding best location on a rail, where piezoelectric generator should be placed. For this analysis the homogenized model of MFC sensor was used. Results of the numerical model were then compared with the results of the conducted experiment. The third part presented own design of piezoceramic sensor, which is placed onto most suitable location on a rail. Results from numerical analysis shown eligibility of using piezoceramic sensor to monitor the railway traffic.
Design of a photovoltaic power system with battery storage for household purposes
Velasquez, Juan ; Maule, Petr (referee) ; Vaněk, Jiří (advisor)
Cílem bakalářské práce je navrhnout fotovoltaický energetický systém na rodinném domu, jenž je odpojen od elektrické sítě. Práce dále obsahuje podrobné informace, jež by mohly pomoci pochopit, jak fotovoltaické systémy dodávají solární energii a které faktory mohou ovlivnit jejich účinnost. Byly použity dva různé programy k simulaci toho, jak by návrh vypadal po celý rok. Byly také zmíněny jejich výhody a nevýhody.
Design and realization of the power meter with IoT connectivity
Zagrapan, Ivan ; Lattenberg, Ivo (referee) ; Krajsa, Ondřej (advisor)
This thesis deals with designing and creating working prototype of IoT Wattmeter with option to switching relay. This device can be control remotely with option to read measured values. To reach my goals, I am using open-source designing board, different sensors and modules. I tis possible to communicate with device through Wi-Fi module ESP 8266 and to test LPWAN network I am using SIGFOX, module. To measure current, it´s used simple Hall-effect sensor and all available information’s are displayed on OLED display. To switch the circuit off or on solid state relay was used. In theoretical part of the work, I am trying to explain working principles of every module and source code, which I am using to control these modules. In practical part I created scheme, using CADSoft EAGLE and created functional wattmeter. Whole work is programmed in C++ language using Arduino IDE.
Management company shop-walker with electric energy
Havlíčková, Eva ; Paukner, Petr (referee) ; Němeček, Petr (advisor)
The thesis evaluates present situation on the market with electricity in the East and the South-East of Europe. It is focused on the firm Coal Energy that operated and operates in the Czech Republic and abroad. It suggests eventual possible solutions in complicated market atmosphere nowadays.
Modern Technologies for Family House Heating
Vidlák, David ; Brázdil, Marian (referee) ; Lisý, Martin (advisor)
The aim of this bachelor´s thesis is to outline the basic knowledge of modern heating methods of family houses. The first part of this thesis describes the history of heating and gives a basic information about heating systems. The second part is dealing with the most frequently used heating systems. The last part of the thesis evaluates the way of heating a particular family house and suggests the possibility of using different heating methods.
Design of Electric Locomotive
Chropovský, Jiří ; Tvarůžek, Martin (referee) ; Křenek, Ladislav (advisor)
The topic of this master’s thesis is design of electric locomotive, more specifically universal independent machine made for pull of personal trains and industrial trains as well. The main aim of this design is to create compact design which follows current estetical trends and fulfill technical and ergonomic needs.
Stabilized operation of the 220 kV power line
Staněk, Pavel ; Ptáček, Michal (referee) ; Blažek, Vladimír (advisor)
This thesis deals with methods of solving lines under voltage levels of very high transmission voltage and extra high voltage. The first, theoretical part of this paper analyses different methods how such lines are solved. In particular, an accurate solution is provided simulated by means of a line with evenly distributed parameters, and an approximate solution simulated by means of a line with lumped parameters. Furthermore, special cases of steady running conditions of the line are reviewed, such as no-load running, short-circuit and line operation with natural load. In conclusion of the theoretical part is given a general method of solving an extra-high-tension and extra high voltage network; also, some graphical methods of solving such networks are shown including their brief description. The second, practical part of the present paper involves application of the above mentioned methods of solution on a specific line with given parameters, solving conditions at the power line under steady running conditions and in special cases of the line operation. The conclusion of the thesis summarizes the obtained results.
The Conversion Efficiency of Different Kinds of Energy into Electrical Energy and the Possibility of its Accumulation
Ostruška, Jan ; Bartošík, Tomáš (referee) ; Macháček, Jan (advisor)
The thesis deals with the issues of the conversion efficiency of different kinds of energy into electric energy. Firstly, the thesis presents a brief introduction into types of energy sources and their capacity. Then, conversion efficiency of particular direct and indirect conversion is scrutinized, pointing to factors which affect conversion efficiency. The next chapter deals with the possibilities of accumulating electric energy. These are analysed as far as conversion efficiency is concerned as well and the end of the chapter concludes with comparison of these particular possibilities. Booth parts of the process – power generation and its accumulation – are connected in comprehensive scheme of energy conversions. The thesis develops on this scheme by mathematic description of its components and by designing a simulation programme, which would show the flow of energy in the scheme.
Cars Electric Drivetrain
Guráň, Radoslav ; Kloss, Ondřej (referee) ; Kaplan, Zdeněk (advisor)
This bachelor`s thesis is a specialized research, focused on electric drive units of personal vehicles. The thesis is divided into seven main parts. The first part deals with alternative fuels. The second part divides electric drive units into various sections and describes the history of an electric vehicle. The third section focuses on electric vehicles with a battery and analyzes electric motors and energetic power banks. The fourth and fifth part of the thesis focuses on electric vehicles with fuel cells and vehicles with a hybrid drive. The sixth chapter is devoted to the developing trends. The last section discusses the ecology of vehicles with an electric drive.
Power supply in an automobile
Soukup, Patrik ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
This work deals with the study of automotive alternators and their theoretical analysis. We can find there a listing of losses arising from the alternator, explanation of their formation and also the way of their reduction. Losses reduction is one of the aspects of innovation leading to increase in overall efficiency of the automotive alternator. Therefore a design of particular ways of innovation is made in this work and subsequently the design is verificated using Maxwell - RMxprt.

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