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Temperature measurement in electric machines
Halfar, Ivo ; Huzlík, Rostislav (referee) ; Janda, Marcel (advisor)
The bachelor's thesis Temperature measurement in electric machines deals with beginning and exuding of the heat of electric motors and measuring of the temperature. The temperature is one of the most important values in diagnostic. High temperature could damage an isolation and it could tend to destroy of the whole machine. The temperature influences their magnetic properties on motors with permanent magnets. If you reach the Curie temperature it could come to its demagnetisation. Measuring of the temperature is important to verify allowable warming of motor or more precisely its spooling. The measuring of the temperature is needed for making motors with minimum of charges and its worth at the end. We could use two methods for measuring the temperature. It is contact and noncontact method. Warming and decomposition of the temperatures it is possible to appoint also with help of theoretic computations which are getting of the method of final elements. A lot of computer programs is using this method. Because of the existence of many sorts of electric motors, one of the viewpoints is the principle of working, another one is the construction. I concentrate on problems of asynchronous motors. In this bachelors thesis I have done theoretical calculation and contact and noncontact method of measuring of warming of the asynchronous motor.
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Development of Method for Visualization and Measuring of Temperature Fields in Air with using Thermovision Camera
Pešek, Martin ; Šafařík,, Pavel (referee) ; Černecký,, Jozef (referee) ; Pavelek, Milan (advisor)
This work deals with the measurement of temperature fields in the air using an infrared camera. The dissertation describes the opportunity of measuring the temperature field in the air and the characterization of the developed measuring method. In the next part there are introduced the beginning of thermography imaging and the field of usability of the new infrared measuring method. Further, the theoretical foundations of the thermography measuring method in the temperature fields in the air are described. In the theoretic background there are described the analysis of heat conduction in an auxiliary material, the determination of dynamic properties of the method and the analysis of radiation, which has an influence on infrared imagining. This method requires an insertion of the auxiliary material into the non-isothermal air flow, which can allow for the study of the temperature distribution in air. For effective visualization of temperature fields in the air using an infrared camera, the selection of the appropriate auxiliary material, on which the air temperature displays, is crucial. In the next part of the doctoral thesis, there is a description of static measuring properties of auxiliary materials. The usability range of the measuring method is determined from these properties. In the thesis there are presented the description of the device for the measurement of 2D temperature fields in the air and the description of the measuring device for 3D measurements of temperature fields in the air using an infrared camera, which can also be used for measurements of temperature fields in small enclosed spaces through a viewing window. For the practical use of the method, the detailed methodology of measuring temperature fields in the air by an infrared camera was developed and its applicability was demonstrated on practice examples. The developed measuring method can be used in many areas of research and in practice.
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Development of method for visualization and measuring of temperature fields in air with using thermovision camera
Pešek, Martin ; Pavelek, Milan (advisor)
This work deals with the measurement of temperature fields in the air using an infrared camera. The dissertation describes the opportunity of measuring the temperature field in the air and the characterization of the developed measuring method. In the next part there are introduced the beginning of thermography imaging and the field of usability of the new infrared measuring method. Further, the theoretical foundations of the thermography measuring method in the temperature fields in the air are described. In the theoretic background there are described the analysis of heat conduction in an auxiliary material, the determination of dynamic properties of the method and the analysis of radiation, which has an influence on infrared imagining. This method requires an insertion of the auxiliary material into the non-isothermal air flow, which can allow for the study of the temperature distribution in air. For effective visualization of temperature fields in the air using an infrared camera, the selection of the appropriate auxiliary material, on which the air temperature displays, is crucial. In the next part of the doctoral thesis, there is a description of static measuring properties of auxiliary materials. The usability range of the measuring method is determined from these properties. In the thesis there are presented the description of the device for the measurement of 2D temperature fields in the air and the description of the measuring device for 3D measurements of temperature fields in the air using an infrared camera, which can also be used for measurements of temperature fields in small enclosed spaces through a viewing window. For the practical use of the method, the detailed methodology of measuring temperature fields in the air by an infrared camera was developed and its applicability was demonstrated on practice examples. The developed measuring method can be used in many areas of research and in practice.
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Optimalization of Exhaust Manifold for Škoda 1,2 MPI
Kubiš, Milan ; Ramík, Pavel (referee) ; Beran, Martin (advisor)
The subject of this diploma thesis is optimalization of exhaust manifold of ŠKODA 1,2 MPI engine with respect for the plastic deformation at heat stress. The first part is focused on general description of converter module, whose component the exhaust manifold is. In the next part of the thesis is computation of a heat load of the exhaust manifold. The last part is devoted to the seal analysis of the whole converter module of a ŠKODA three-cylinder engine.
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Optimalization of Exhaust Manifold for Škoda 1,2 MPI
Kubiš, Milan ; Ramík, Pavel (referee) ; Beran, Martin (advisor)
The subject of this diploma thesis is optimalization of exhaust manifold of ŠKODA 1,2 MPI engine with respect for the plastic deformation at heat stress. The first part is focused on general description of converter module, whose component the exhaust manifold is. In the next part of the thesis is computation of a heat load of the exhaust manifold. The last part is devoted to the seal analysis of the whole converter module of a ŠKODA three-cylinder engine.
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Temperature distribution of rubber damper of gasoline engine
Knor, Pavel ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
The main aim of this master’s thesis is to design the drivetrain of four-cylinder gasoline internal combustion engine with torsional vibration rubber dumper. For the basic parameters of the engine are designed two optional crankshafts. Crankshaft with eight counterweights and crankshaft with four counterweights. The thesis also includes modal analysis of the crankshaft using FEM, and design of the main dimensions of the dumper. The following part describes the calculation of force torsional vibration and safety factor solution of crankshaft fatigue using FEM. The final calculation is of the temperature field in the rubber dumper in selected operating modes.
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Selected heat transfer phenomena in air conditioning
Vojkůvková, Petra ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
Numerical simulation is a scientific method used to describe characteristics of examined system by means of experiments on its mathematical model. This thesis uses this method to elucidate the processes taking place in two different systems. Firstly it deals with the design of air conditioning systems for buildings, focusing on the mixing chambers. It focuses on the formation of condensation of water vapor in mixing chambers under conditions where the final temperature of the mixture does not drop below the saturation curve. Second prepared topic falls within the field of thermodynamics applied in food production. In order to assess the sufficiency of air-cooling method examines the thermal field in the product and evaluates the application of air-cooling assembly line in practice.
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Thermal insulation and backfilling as a way to save metal and anergy in foundry
Kos, Jan ; Sekanina, Bohumil (referee) ; Kavička, František (advisor)
Types were summarized, principles and thermo-physical properties of thermal insulation and backfilling and their use in the foundry industry to provide directionally solidified castings and then their quality. It summarized the need for numerical simulation of thermal field system casting-form (core)-around the control and prediction of directional solidification. They are some commercial software using different models of solidification. As an example, using one of the models describe the procedure as a pre calculation to decide which of two possible isolation of the riser will be more effective.
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Holographic interferometry as a tool for visualization of temperature fields in fluids
Dančová, Petra ; Vít, Tomáš ; Lédl, V. ; Trávníček, Zdeněk ; Doleček, R.
Measurement of temperature field in moving fluids is connected with many difficulties. Usage of point temperature measurement methods, such as Constant Current Anemometry (CCA), is limited to frequencies up to 3kHz. This frequency should be the limiting factor for using the CCA in fluid when fast change of temperature occurs. This shortcoming of CCA measurements should be overcome by using of optical methods such as digital holographic interferometry. It is necessary to employ a special holographic setup with double sensitivity instead of the commonly used Mach-Zehnder type of holographic interferometer in order to attain the parameters sufficient for the studied case. This setup is not light efficient like the Mach-Zehnder type but has double sensitivity. The special technique of acquiring and phase averaging of results from holographic interferometry is presented.
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