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Proposal to revitalize the banks of the flooded Hulín sand pit
Skřížala, Lukáš ; Pelikán,, Petr (referee) ; Šlezingr, Miloslav (advisor)
The master´s thesis deals with the assessment of the state of the shore territory on the Brno reservoir, in the Osada area and subsequently the proposal for shore stabilization. As part of a personal visit to the area of interest, photographic documentation, geodetic focus and subsequent assessment of the current state of the abraded shores were made. Using the geodetic focus and data of water heights on the reservoir provided by the Povodí Moravy, s.p. the most numerous in the reservoir was evaluated in 2007-2017, the coastline retreat and the proposed shore stabilization were determined. There was suggested totaly eight measures were proposed against the further retreat of the shore line, which were incorporated into schemes and visualizations.
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Analysis of the Rössler dynamical system
Nechutová, Vendula ; Nechvátal, Luděk (referee) ; Čermák, Jan (advisor)
In this bachelor thesis, there is analysed Rössler dynamical system, especially stability and type of its fixed points. Theoretical calculations are supported with visualizations illustrating notions of bifurcation and chaotic behaviour. In the last part, stabilization of chaotic Rössler dynamic system by delayed feedback control is discussed.
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Simulation and control of a flying robot
Moravec, Vojtěch ; Gábrlík, Petr (referee) ; Šolc, František (advisor)
This work describes multi-rotors aerial vehicle, known as copter. The first part is summary of types of copters and its construction. Control system is designed on dedicated mathematical model. Both control system and model of copter are implemented in MATLAB/ Simulink environment. There are implemented common effects such as drag force or errors of sensors and uneven mass distribution. Simulation of flight of copter is visualized and there is possibility to control flight of copter manually with connected joystick.
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Lateral-torsional buckling of steel beams with restraints out of bending plane
Balázs, Ivan ; Vejvoda,, Stanislav (referee) ; Studnička,, Jiří (referee) ; Melcher, Jindřich (advisor)
The doctoral thesis focuses on problem of stability of steel thin-walled beams with lateral and torsional restraints along the spans. Theoretical background of lateral-torsional buckling of an ideal beam with and without restraints preventing out-of-plane buckling is briefly described. In the following chapters the problem of stabilization of steel thin-walled beams by planar members is dealt with. The state of the art in this field is summarized and some open questions are identified. The research in this field could bring new findings about actual behavior of these structural systems. The rate of stabilization can be quantified using values of shear and rotational stiffness provided to a thin-walled member by a planar member. In the frame of the thesis the problem of torsional restraint given to steel cold-formed members by sandwich panels under load is discussed. In case of the uplift load applied on the sandwich panels the torsional restraint should be verified by experimental analysis. To contribute to this field, experimental verification of rotational stiffness provided to steel cold-formed beams by sandwich panels was proposed and performed. Torsional restraint under no external load as well as under uplift load applied on the panels was investigated. The purpose was to obtain the values of the rotational stiffness provided by planar members. The performed tests indicate significant and practically applicable rate of the torsional restraint even in case of the uplift load on the surfaces of the panels. Utilization of the values of the rotational stiffness might result in more economical, effective and reliable structural design. Selected problems were investigated using numerical modeling in a finite element method based software.
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Gluing as a method for flat roofs stabilization
Šafářová, Markéta ; Oláh,, Jozef (referee) ; Plachý,, Jan (referee) ; Lavický, Miloš (advisor)
Flat roofs are very desired type of building roofing these days. We can find flat roofs in construction of family and apartment houses, manufacturing and storage buildings, office buildings, shopping centres, etc. and not only in constructions of new building, but in substantial amount also during reconstruction. For every flat roof it is necessary to design a way of roof plies stabilization against wind suction. Gluing is one of many used methods of flat roof stabilization. The gluing itself can be implemented by innumerable adhesives of various compositions from many manufacturers. Gluing has advantages and disadvantages as every method. Lack of information can be considered as key disadvantage. Especially the lack of information about strength of gluing joints. The dissertation is focused on polyurethane adhesives, their application for stabilization of layers in flat roof and experimental determination of strength values of glued joints. The first phase of the dissertation aims to create a test methodology for experimental measurements. As a part of the methology to create a test model, a test apparatus and a procedure for experimental measurements. In next phase dissertation focuses on experimental measurements and their evaluation. Research was primarily focused on properties of gluing joint depending on the amount and type of the adhesive, material of bonding layers and technological indiscipline. The results of experimental measurement provide numerical values of strength of the gluing joints and pointed to risky situations which can occur during realization. The conclusion provides practical recommendations and possible opportunities for continuation of the work on this topic.
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Polymorphism of dicalcium silicate
Matysík, Robert ; Fridrichová, Marcela (referee) ; Gazdič, Dominik (advisor)
The presented bachelor thesis is focused on the study of the mineral belite, polymorphism of belite, its conditions of origin and stability of polymorphs. The theoretical part is focused on the composition of cement, its minerals, modifications and properties. Furthermore, the possibilities of stabilization of polymorphs, synthesis and microstructure of dicalcium silicate are presented in the given section. The practical part is a summary of current research results at FAST BUT, THD. Based on previous work, a research was proposed in which a change in the properties of dicalcium silicate from a pre-fired mixture was observed.
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Hybrid headphone amplifier for the high-end listening and performance
Čacký, Adam ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor´s thesis describes the design of a high quality small portable headphone amplifier for dynamic headphones. Part of the work is theoretical assumptions for the optimal design and implementation of peripheral involvement, comparing the properties of components used and the resulting parameters of modeled device. Analyses of the electrical quantities of the circuit created in simulation software are enclosed.
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Stability and chaos in nonlinear dynamical systems
Khůlová, Jitka ; Tomášek, Petr (referee) ; Čermák, Jan (advisor)
Diplomová práce pojednává o teorii chaotických dynamických systémů, speciálně se pak zabývá Rösslerovým systémem. Kromě standardních výpočtů spojených s bifurkační analýzou se práce zaměřuje na problém stabilizace, konkrétně na stabilizaci rovnovážných bodů. Ke stabilizaci je využita základní metoda zpětnovazebního řízení s časovým zpožděním. Významnou část práce tvoří zavedení a implementace obecné metody pro hledání vhodné volby parametrů vedoucí k úspěšné stabiliaci. Dalším diskutovaným tématem je možnost synchronizace dvou Rösslerových systémů pomocí různých synchronizačních schémat.
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