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Design of electrical travel of reaper`s drive unit
Otoupalík, Jan ; Černý, Michal (referee) ; Koutný, Daniel (advisor)
This bachelor thesis focuses on the design of electrical travel for universal mowing machine, which will be controlled remotely. Designed travel has independent wheel drive, the maximum speed of 10 km per hour and can be used in the terrain with a slope of 30°. The thesis deals with the determination the parameters of the travel, design of the possible electrical drive units and design with respect to the stability of the device. Another part of the thesis deals with the design of the travel and describes particular parts of the travel.
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Decomposition and stability of organic matter in soil
Tabaková, Eva ; Enev, Vojtěch (referee) ; Klučáková, Martina (advisor)
In the soil, the plant material is decomposed by several factors. In the process, one part of the carbon returns to the atmosphere as carbon dioxide, whereas another part is stabilised in the soil. The aim of this study is decomposition and stability of organic matter in soil using a simple and innovative TBI method. Through this method, we examined the weight change after the incubation period of 90 days, where biomass of green tea was degraded in cambodia soil. Tea bags have provided us with valuable information on the decomposition and amount of carbon in the soil, because the biomass itself is of organic origin. This information is based on the fact that the soil and the decomposition processes have a direct impact on the change in climatic conditions. Thanks to further analytical methods, elemental analysis, thermogravimetric analysis and infrared spectroscopy with Furier transformation, was found indispensable information about tea composition.
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Extension of Centrifugal Compressor Operational Stability
Růžička, Miroslav ; Třetina, Karel (referee) ; Kmoch, Petr (referee) ; Klement, Josef (advisor)
Centrifugal compressors with high pressure ratio are widely used in small aircraft turbine engines and turbocharges. At high rotational speeds they have narrow stable operating region and commonly used impellers with back swept blades are not able to ensure requested stability. In order to achieve wider stable operating region, some other anti-surge measures can be used, such as an Internal Recirculation Channel (IRC) located in compressor impeller inlet. This thesis deals with an investigation of IRC influence on centrifugal compressor operational parameters. As a first, the various recirculation channel geometry was studied by using of CFD analysis on simplified computational models. Those geometry, which indicated best results in terms of mass flow and looses in channel were used for testing on a model test device. Subsequently the same geometry was tested on real centrifugal compressor in experimental turbine engine to verify influence of IRC on compressor performance map – pressure ratio and efficiency. Simultaneously the CFD analyses of IRC with a 3D model of compressor impeller were performed and results compared with those, gained from measurement on model and compressor. In addition the measurement of flow field downstream the recirculation channel outlet slot with using of 3-hole pressure probe was performed and compared with flow velocity profiles evaluated from numerical simulations.
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Steel Structure of Observation Tower
Klimeš, Pavel ; Šmak, Milan (referee) ; Hron, Lukáš (advisor)
The bachelor thesis concerns with the design and static analysis of the lookout steel construction, which has the height of 25 m and is situated in the Žabčice location. The technical report and drawings are included in the thesis as well. The aim of the thesis was to determine the lookout total load (including permanent, live and climate loads), its implementation in the computer software SCIA Engineer 2012.0 and to perform the stress analysis of selected rods, joints and anchorages by means of the manual calculation. The author of the thesis focused on the climatic load due to wind and ice accretion, which was determined with the use of two approaches according to standards ČSN EN 1991-1-4, ČSN EN 1993-3-1 a ČSN ISO 12494. Both the approaches were evaluated and for the less favorable one the static analysis was carried out.
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Linear difference equations: stability analysis
Tesař, Lukáš ; Dosoudilová, Monika (referee) ; Tomášek, Petr (advisor)
This thesis deals with asymptotic stability investigation of linear difference equation. The Schur-Cohn criterion and discrete Routh-Schur criterion are introduced and demonstrated on several examples. Both criterions are implemented in Maple programming enviroment. Boundary locus technique is illustrated on a stability analysis of the Adams-Bashforth method for numerical solving of an initial value problem of first order ordinary differential equation.
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Stabilization systems of motorcycles
Honek, Bohumil ; Tobiáš, Martin (referee) ; Zháňal, Lubor (advisor)
In terms of this bachelor’s thesis, the author created a comprehensive overview and description of mechanical and electronic stabilizing systems of one-track vehicles. This thesis furthermore deals with the impact of a vehicle’s structure on its stability and riding dynamics and also includes a brief historical development of the individual components. This thesis then offers an outlook into the close future of vehicles’ and similar machinery’s stability, followed by the author’s critical evaluation.
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Study of Precision of the Stability Analysis
Sotulář, Jiří ; Pilgr, Milan (referee) ; Hron, Lukáš (advisor)
The thesis deals with the precision of the stability analysis of the pressed member. The loss of stability of the bukling is determinate by using several metods, which are compared each other. The thesis is partitioned into three parts that works together. The first part deals with the theory of analysis of the buckling stability. Here is described the gradual solution of analytical analysis for real beam and here is described the final compared for ideal, imperfekt and real beam too. It is also short solved buckling by using software. In the second part is compared by using computing systems and anylitical analysis for several basic buckling systems. The results of the compared are summarised in the final graphs and tables for each solved element and systems. In the third part are designed and static checked load-bearing element of steel storage hall. The buckling beams are checked by using findings from the previous analysis.
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