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Thermal analysis of synchronous machine
Bartoň, Petr ; Hájek, Vítězslav (referee) ; Janda, Marcel (advisor)
The master’s thesis deals with analysis of warming and cooling of synchronous machine. The warming is caused by the machine’s losses resulting from the conversion of electrical energy into mechanical energy. There then can be achieved high values of temperature on the machine, which can lead to destruction of the machine. The transient thermal analysis, working on the finite element program Ansys Workbench, is used for thermal analysis. As an appropriate instrument, which serves for flow calculation, a module CFX in the program Ansys Workbench may be used. In the practical part the model for unhampered alternator with current in the field winding only was measured and after that, the measured values were compared with the results of transient thermal analysis. Speed and progress of air flow through machine were analyzed with CFX module.
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Temperature measurement of an asynchronous motor
Bartoň, Petr ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
In this thesis there are described methods which are used in order to measure a temperature in electric machines. Whereas there is an influence of magnetic field and mechanical effects in the electric machines it is possible to use only limited number of methods for measuring temperature. These methods can be divided into two basic groups. The first group is being called "contact measurement" and while the second one is "non-contact measurement". Contact measurements are performed by usage of resistant sensors or thermocouples. On the other hand, non-contact measurements are performed by pyrometers and thermal imager cameras. Theoretical values of warming are determined by the FEMM which operates on the basis of the finite element method. In the practical part there are compared several methods whereby asynchronous engine was measured at various loads. Measured values are compared with theoretical values.
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Zhodnocení vybraných ukazatelů složení mléka v průběhu laktace u ovcí plemene cigája
Bartoň, Petr
This master’s thesis evaluates selected indicators of the quality of sheep milk and its components. The sheep of the selected Tsigai breed are bred in the northern part of Zapadni Tatry in Slovakia. As a part of the thesis pool samples of sheep milk were collected at periodic intervals. The pool samples were collected on the average 45th, 75th, 105th, 135th, 165th, 195th, and 225th day of the lactation period. A group of Improved Wallachian breed sheep was added to the experiment for comparison. The milk of the Tsigai breed contained on average 20.03 % of dry matter, 8.14 % of milk fat, 6.38 % of proteins, 4.70 % of lactose, and 63.86 mg/100 ml of urea. The following physicochemical traits were assessed: active acidity, titratable acidity, and a freezing point of the milk. The average value of active acidity was 6.55, of titratable acidity 9.2 °SH, and of the freezing point -0,576 °C. The last sample surprisingly contained a low amount of lactose, however, the most surprising finding was an extremely low amount of somatic cell count at the end of the lactation period. Ascertained correlations correspond with the available papers and do not differ significantly. The acquired results for the Tsigai breed are comparable with the comparison breed of Improved Wallachian.
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Interdisciplinary relationships at the level of the planned curriculum in the educational areas of Mathematics and its Applications and Man and the World of Work.
BARTOŇ, Petr
The goal of my diploma thesisis to create a set of tasks for education at basic school. This thesis is especially focused on realization of tasks from practice.In theoretical part I deal with complex of inter-subject relations between described branches in this work, computer support, selection of 3D CAD programmes at basic school with regard to price availability and technical designing (drawing). The practical part is focused on working papers. This part allows the construction of product using the calculation of word task. This calculation makes theimage about that product easier and allows creation of model in the CAD programme and the final production. This thesis is checked up by pupils in ninth degree of basic school. The fundamental part of this work forms appendix of working papers, which are prepared for education. I consider the approachof solving the tasks for pupils at second degree of basic school to be innovative.
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Dust trap for light scattering study
Bartoň, Petr ; Pavlů, Jiří (advisor) ; Jeřáb, Martin (referee)
Title: Dust trap for light scattering study Author: Petr Bartoň Department: Department of Surface and Plasma Science Supervisor: doc. RNDr. Jiří Pavlů, Ph.D., Department of Surface and Plasma Science Abstract: Light scattering on small grains is common interaction occurring wi- dely in space environments, including Moon surface, dusty nebulas or even the upper atmosphere of the Earth. For experimental measurements of light scatte- ring intensity profiles, we designed and constructed a unique experiment. Using so called acoustic trapping, we are able to capture a single dust grain (or small water droplet) in midair, to irradiate it with the laser beam, and to observe scattered light directly with the photodiode mounted on a precise goniometer. In the thesis, we present not only construction details, but also the first results, which help us to evaluate abilities of the experiment, and provide useful recommendations for further development of all dust-related experiments. Keywords: light scattering, acoustic trap, dust grain, scattering measurement 1
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Proposal of ultrasonic trap
Bartoň, Petr ; Pavlů, Jiří (advisor) ; Vyšinka, Marek (referee)
Light scattering by dust grains is a complex problem when the size of the grain is about the wavelength of incident light. The Mie theory is often used to characterize such situtation, however, most of the materials lacks knowledge of neccessary material constants. Moreover, solution of Mie equations for general shapes is difficult and partly not known. Objective of this work is development of apparatus for light scattering measurements on small (micrometer ranged) ar- bitrary shaped dust grains levitating in the ultrasonic field. Trap parameters are obtained by survey of literature and by numeric simulations leading to design of reliable ultrasonic levitator including optical system. The results enable manu- facturing and completion of such apparatus. Eventually, this work can serve as guide "how to design ultrasonic levitator".
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Identity, Community and Symbolic Interactionism in the Digital Age
Bartoň, Petr ; Balon, Jan (advisor) ; Mucha, Ivan (referee)
The thesis presents a compilation about social relations and identity formation via digital technology and new media, internet in the first place. The author, with the regard to contemporary processes as globalization and rapid digital technology development, mainly relates to two topics, following the view of complexity, mutual implications, cohesion and conditionality of individual identity, interpersonal relationships and social relations, from the perspective of symbolic interaction theory. The first topic is concerning theories about "virtual" and "disembodied" individual "self", which the author endeavours to disconfirm, using Hansen's concept of a body as a specific image. The second topic describes the forms of interpersonal relationships and social relations - author maintains that the "traditional" views of the latter don't perish, but transform and redefine themselves. Similarly, their embedded "qualities" subsequently don't disapear nor devalue.
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Comparison of CAD programs
BARTOŇ, Petr
My thesis focuses in the first section on product lifecycle management (PLM), CA procedures and explanation of definitions used. In the second part the history is men-tioned and the third describes basic sorting of CAD systems. The most voluminous fourth chapter is dedicted to description of particular systems with their pros and cons and user environment. In the fifth part there are set the conditions of posibility of appli-cation based on interviews with constructers. The CAD programms are usually not che-ap anf for this reason they must meet the criteria of daily use optimally.
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