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FEA modelling of synchronous machine
Ficza, Tibor ; Kurfűrst, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
Táto práca sa zaoberá s modelovaním synchronného stroja s permanentnými magnetmi pomocou metody konečných prvkov. K modelovaniu sme si zvolili 3 fázový synchronný stroj s permanentnými magnetmi na povrchu rotora z firmy VUES. Najprv vypočítame parametre stroja a potom spravíme statický model pomocou programu FEMM a Matlab a budeme hladať možné riešenia na 2D dynamický model. Pomocou programu Ansys Workbench spravíme 3D model tohoto stroja budeme a porovnávať výsledky simulácie.
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Design of settlement structure of contemporary city in historical context.
Macholánová, Petra ; Obrtlík,, Jan (referee) ; Májek, Jan (advisor)
The diploma thesis deals with an urban study on the territory of Červený kopec, specifically in the part of the territory of Stráň. It is a locality stated as a brownfield Kohnova cihelna. The proposal aims to make the most of the potential of this site, which lies in its proximity to the city center, the neighborhood of the national natural monument, a significant area of greenery and the views that this place provides due to its topographic situation. A new city district is proposed on the area of 18 hectares, which would cover one of the "brownfield holes" on the map of the city of Brno and at the same time help against the outflow of population to the outskirts of the city and against the creation of urban satellites. Numerous public opinion polls show that they would like to live close to the city, but at the same time especially young families long for their own house in a quiet countryside location. Therefore, a compact development of terraced houses, terrace villas and blocks of flats with private courtyards is proposed here, complemented by quality public space and civic amenities. This new city district would offer housing for about 3,500 new residents.
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Model of synchronous PM machine based on equivalent reluctance network
Sporni, Peter ; Lapčík, Josef (referee) ; Ondrůšek, Čestmír (advisor)
Táto práca pojednáva o problematike vytvárania a simulácie reluktančnej sieti synchrónneho stroja s V tvarovanými permanentnými magnetmi v programe PSpice. Na začiatku sa oboznámime s konštrukciou a parametrami stroja a potom vyvodíme základné rovnice na výpočet každého prvku siete. Vypočítame každý prvok tohto stroja a potom vytvoríme túto sieť v PSpice. Na začiatku je simulovaná sieť statická a všetky magnetické odpory sú lineárne. Neskôr nahradíme lineárne odpory reprezentujúce plechy nelineárnymi a počítame s precovnou teplotou permanentných magnetov. Potom porovnáme naše výsledky s FEM metódou počítanými hodnotami a vypočítame indukované napätie v jednej cievke stroja. Na záver vypočítame výkonovú a momentovú charakteristiku stroja.
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What can be built in the largest city block in Brno?
Hlaváčková, Soňa ; Rudiš, Viktor (referee) ; Hybská, Bohumila (advisor)
The chosen solution is based on a significant element of the axis intersecting the studied area and allows for new possibilities and throughput bottlenecks as well as the needs of indigenous residents. The new structure is compact but permeable, is one of total serenity set into court. Buildings define its own square on which the park. Living rooms are oriented to this element, as generated by the spontaneous dvorcům compared to the other, where we are going gardens. Old and new buildings mainly divided foliage, to a greater extent original. Height was chosen so that does not diaphragm the existing development and that the occupant was still in touch with events in the street. Distance from the neighboring area is sufficient for satisfactory insolation. The appearance of buildings and facades in the treatment of natural materials give a greater sense of coziness.
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The evaluation of the effect of crystallization additives on durability cement composites
Roubal, David ; Bydžovský, Jiří (referee) ; Dufka, Amos (advisor)
This bachelor´s thesis deals with the study of crystalline materials and their effects on the durability of concrete. The theoretical part of this thesis focuses on the detailed analysis of the characteristics of crystalline materials, including their division and use. It also particularizes the main factors influencing the durability of concrete and provides an overall research of crystalline materials testing. Based on the findings, the experimantal part focuses on the examination of crystalline materials applied to self-compacting concrete. The examination included, among other things, testing in aggresive environment and strength and permeability test carried out on set SCC.
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Influence of zinc loss during the sintering on permeability/inductance of ferrite ceramics
Kvapilová, Vendula ; Ptáček, Petr (referee) ; Šoukal, František (advisor)
The diploma thesis is focused on the investigation of the effect of zinc release during ferritic sintering on the permeability/inductance of ferrite ceramics. The theoretical part deals with the position of ferrites among other ceramic materials. It describes the basic characteristics of ferrites, their crystal structure and finally the problems that are directly related to their production and which fundamentally affect the magnetic properties of ferrites. In the second part of the work, the influence of the temperature and time of sintering and the position of the cores in the furnace during firing on the loss of zinc from the sample and subsequently on the electromagnetic properties of the prepared test specimens from industrial raw material mixtures was investigated. These are initial experiments, which will be followed by further research aimed at eliminating the problem of zinc loss in the production of Mn-Zn ferrites.
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Design of settlement structure of contemporary city in historical context.
Skoupilová, Michaela ; Obrtlík,, Jan (referee) ; Májek, Jan (advisor)
This diploma thesis is focused on project of sustainable urban structure in Náměšť nad Oslavou. Specifically, in southeast area of the city between pond Rathan and dam Vícenický žleb. This urban-planning study endeavours to create a suitable structure for city area behind railways. There are relevant factors which influence the proposal, such as connection of the parcel to traffic network of the city and breaking down barrier of the railway. Other factors are slope of the terrain and significant nature and historical character of the city. The concept is based on perception of the city area behind the railway, as separated district of the city which must be connected to current structure. Conception of the area uses historical legacy of path. This path copy axis, which connects castle, statue on main historical square and Cristian cross on forest horizon in designed area. It is important to support natural character and genius loci of the whole city. The urban study emphasizes the effectivity of the land use, traffic connection, scale of the city, permeability of the new designed area, importance of pedestrian’s movement and cancelation of residential monofunction by creating of central public space. Placement of dominants is important due to view of the city.
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Influence of changes in concrerte pore structure on actually durability of reinforced and pre-stressed structures.
Kovalčíková, Hana ; Adámek, Jiří (advisor)
This master thesis deals with a durability of concrete, which has become the centre of the interests of international scientific insitutes during the last years. The resistence of reinforced concrete depends on the covercrete which the aggresive liquids and gases penetrate through from the environment to reinforcement. According to the ability of the covercrete to penetrate degradative species is possible to tell the durability of concrete constructions. In experimental part we look for the actual state of covercrete, ordinary and high strength, by combination of various experiments. We can find here the test´s results of water and gas permeability and absorbability and sorption of concrete which complete the permeability tests. In final part the impact of different concrete types on durability of reinforced concrete is discussed.
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