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Modeling and fault detection of electric power system
Kluz, Jan ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
Thesis focuses on the topic of fault detection of power systems. First part presents a comprehensive review of area of reactive, preventive and predictive maintenace of power systems based on physical or AI–driven models. Important part is design and subsequent assembly of an experimental testing device. This device incorporates four faults: heightened contact resistance, low contact area, parallel load imbalance and sparking. Device contains precise current and linear Hall sensors. The device has successfully been assembled and tested with positive results. A lumped parameter thermal networks has been created on this experimental device and results were verified with measured data. Thesis also contains statistical analysis of voltage and current signals, that were captured during spark discharges with 10 – 90 voltage supply.
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Design of DC motor for teaching
Hajdú, Zsolt ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
The topic of this bachelor thesis is Design of DC motor for teaching. The main goal of this bachelor thesis was to create an electric motor that uses direct current, commutator brushes, and permanent magnets to generate torque. Another goal of this bachelor thesis was to achieve 50W of power at 100rad/s. We also set a secondary goal to achieve 50% efficiency across the entire speed range. To create the theoretical model, we used Fleming's right-hand rule. Using this principle and based on calculations, we constructed the motor. The main power source was a car battery. After constructing the motor, we measured its parameters and compared the obtained values with the theoretical ones.
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Coupled model of synchronous machine
Šmída, Michal ; Kraml, Aleš (referee) ; Vlach, Radek (advisor)
This thesis focuses on creating a coupled model of a synchronous motor using Matlab. To make a coupled model, it is necessary to correctly determine the surrogate schematics that represent the physical domains-electrical, mechanical and thermal. The combination of these parts can be called a coupled model, which captures their interdependence. The main goal of the work is to make the output of the model as close as possible to the real machine.
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Thermal management system design for cylindrical lithium cell testing
Skalník, Adam ; Stravová, Zuzana (referee) ; Vlach, Radek (advisor)
The aim of this thesis is to design a device that allows testing of cylindrical lithium cells by testing the load at controlled temperature. To achieve the desired temperature range, a custom thermoelectric model of the TEC cell with temperature dependency of the parameters was developed and a suitable cooling method for the cells was selected. A thermal model was developed for this cooler. A simplified model of the 18650 type lithium battery was created. Based on FEM analysis, the expected temperature loss on the battery, the temperature gradient on the battery and the dynamics of transients were determined. An overall thermal model of the system was developed, according to which the appropriate number and type of TEC cells were selected. Optimal supply currents for this cell configuration were determined and control was designed. The thermal model and the required characteristics were verified on a prototype of this device.
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Positioning device for light microscope
Materna, Jan ; Čermák, Jan (referee) ; Vlach, Radek (advisor)
The thesis deals with the design and implementation of a device prototype enabling biaxial tilt and rotation of a sample examined with an inverted light microscope. This device is also adapted for remote control. The work first focuses on the research of possible solutions and then on the design of the entire device, including motorization, control, power supply or working with samples.
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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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Experimental equipment for testing of heat pipes efeciency
Vostřel, Vít ; Lošák, Petr (referee) ; Vlach, Radek (advisor)
This bachelor thesis deals with construction of a measuring apparatus for measuring efficiency of heat pipes. The thesis first discusses heat pipes and all components of the measuring apparatus in theoretical way and than it describes construction of the real model and all needed calculations. The apparatus contains a movable arm to which the measured heat pipes are attached. The Arm is able to move form 0° to 90°. The apparatus construction procedure is also described here. The whole apparatus is controlled from the computer using Excel, macros created in Excel and Data Streamer tool.
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Pressure Sensors Based on Modern Nanotechnologies
Magát, Martin ; Hudec, Lubomír (referee) ; Vlach, Radek (referee) ; Vrba, Radimír (advisor)
This thesis describes utilization of a nanotechnology in new pressure sensors. Detailed analysis of individual principles are carrying on. And simulations and experimental models of sensors are developed. More detailed description is provided for new capacitive pressure sensor, which is manufactured using nanotechnology, including its model and analysis in order to improve its properties. The work deals with the emission pressure sensor which uses the principle of cold emissions, including analysis comparison of the measured values of the emission current from the applied nanotubes field and analysis to improve emissions performance.
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Design of computational algorithm for using of hollowed shaft in electric machine
Tobiáš, Jan ; Hadaš, Zdeněk (referee) ; Vlach, Radek (advisor)
The aim of this work is to develop the possibility of usage the hollow shafts in electric machines. The first part focus on explanation theory of mechanic, which is connected with loading of the shaft. Specifically are explained the methods of computation deformation and normal stress. Next is mentioned the theory of gyroscope and described its consequence. After that is explained problematique of critical speeds. In the following part is described process of solving the shaft loading according the previous analytic formulas. These formulas are formulated to be able to reflect the shaft loading depending on value of inner diameter as property. Practical part focus on creating the calculator for usage the hollow shaft in electric machines. In this chapter is described how the calculator works and how to controll it by user. In the last part are shown calculated results and their analysis. In the summary is mentioned possible usage of the results and ideas for improvements.
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Universal control unit of technological processes
Gogola, Marek ; Vlach, Radek (referee) ; Krejčí, Petr (advisor)
This diploma thesis is about design and realization of universal control unit of technologic processes in food-processing industry. The main goal of this work is to create a device, which will be able with respect to desired values and using measured data autunomusly regulate output. In this work was done the realization of the control unit both from hardware and software aspect. Designed control unit is able to change the output power according to measured temperature. Furthermore is able to control of 2 relays. To set up the desired values and control of relays is used PC software.
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