National Repository of Grey Literature 77 records found  beginprevious17 - 26nextend  jump to record: Search took 0.00 seconds. 
Design of Darrius rotor as source of electric energy
Novotný, Martin ; Houfek, Martin (referee) ; Vlach, Radek (advisor)
This bachelors thesis deals about possibilities to use alternative energy source - wind. Model of Darrieus rotor was build for learning purposes using accessible materials and tools. The build model was tested and measured to discover real functionality and characteristics.
Electrically powered plane conceptual design
Ševčík, Igor ; Sklenář, Filip (referee) ; Popela, Robert (advisor)
The master’s thesis deals with conceptual design of a new electrically powered aircraft as assignment for Evektor, s.r.o. company. In the first part of thesis there is more detailed elaboration of small aircraft statistics and their comparison. Thesis then concentrates on assigned parameters and requirements for design. Next section continues with the most important part of thesis, which is optimization of wing used for aircraft design and also analysis of its characteristics. The problematics of preliminary verification of flight performances as well as aircraft dimension design and follow-up weight analysis with consideration of power cells placement is described thereafter. A few different flight configurations is taken into consideration within weight analysis. Final part contains evaluation of optimization and design process.
Comparison of analytical and numerical solutions for buckling of an aluminium alloy profile
Bolek, Robert ; Šebek, František (referee) ; Návrat, Tomáš (advisor)
This bachelor thesis deals with the solution of buckling stability of a thin-walled profile made of aluminium alloy Al 6061.T6. The solution is carried out by analytical and numerical methods. The Abaqus software, based on the finite element method, was used for the numerical solution. The aim was to determine the maximum load on the profile by different methods, following with their comparison and evaluation according to the accuracy, versatility and time requirement of each method.
HPH 2 Twin Shark glider loading calculation
Pělucha, Jiří ; Jebáček, Ivo (referee) ; Juračka, Jaroslav (advisor)
The object of diploma thesis is a loading determination for strength calculation of HPH 2 Twin Shark glider matching the requirements of Certification Specification for Sailplanes (CS-22). Loading of the wing, tail section, fuselage and undercarriage is determined in this work.
New Approaches in Numerical Aeroelasticity Applied in Aerodynamic Optimization of Elastic Wing
Navrátil, Jan ; Slavík, Svatomír (referee) ; Komárek,, Martin (referee) ; Hlinka, Jiří (advisor)
Aeroelasticita je nezbytná vědní disciplína zahrnuta do návrhu letounů. Zaměřuje se na předpovídání jevů, které vznikají vlivem interakce aerodynamických, elastických a setrvačných sil. Tyto jevy často vedou ke katastrofickým následkům, proto musí být prokázáno, že nevzniknou v rozsahu rychlostí ohraničujících letovou obálku. Aplikace moderních materiálů při konstrukci draku, spolu se snahou navrhnout aerodynamicky efektivní tvar křídel, vede ke zvyšování poddajnosti letounů. To má za následek změnu aerodynamických vlastností a také k výraznějšímu vliv na aeroelastické jevy, které mohou být vyvolány snadněji vlivem pohybů tuhého tělesa než v případě tužších konstrukcí. Aeroelastické jevy mohou vznikat v širokém rozsahu rychlostí zahrnujícím i transsonickou oblast. V této oblasti je ovlivněna zejména rychlost, při níž dochází k třepetání, a to vlivem nelineárních jevů v proudu. Běžné nástroje, které jsou založeny na lineárních teoriích, nejsou schopny tyto nelineární jevy popsat. Cílem práce je proto navrhnout, implementovat a otestovat nástroj pro výpočetní (numerickou) simulaci aeroelasticity. Nástroj má využívat řešič proudového pole, který je schopen předpovědět nelineární jevy. V práci je kladen důraz na simulaci statické aeroelasticity. V práci jsou popsány metody, které je nutno zahrnout do numerické simulace statické aeroelasticity. Dále je popsán vlastní nástroj a je provedeno zhodnocení konvergence statických aeroelastických výpočtů. Funkčnost nástroje byla ověřena na příkladech, kdy byly použity různé aerodynamické a strukturální modely. Nástroj byl také aplikován při aerodynamické tvarové optimalizaci poddajného křídla. Výsledky optimalizace a její výpočetní náročnost byly porovnány s případem optimalizace tuhého křídla. Na závěr je v práci prezentován příspěvek autora do výzkumu zaměřeného na zhodnocení vlivu časové synchronizace mezi CFD a CSM řešiči. Použitý testovací případ je transsonické obtékání křídla na začátku třepetání (flutteru). Výsledky byly srovnány s experimentálními daty poskytnutými NASA.
Time minimization for vehicles passing a given trajectory
Suja, Jerguš ; Kůdela, Jakub (referee) ; Porteš, Petr (advisor)
This bachelor’s thesis deals with model building of automobile movement and it’s optimal speed in every single point of trajectory, whit aim on minimal lap time. It uses a real data, which was measured on Masaryk circuit in Brno. Contents of thesis are analysing effecting forces on vehicle’s dynamic and then building mathematic model. The main purpose is finding optimal speed characterization and compare with real data. Then, we modify model with adjustable wing and present advantage of this customization. Simulation was done by program MATLAB.
Usable properties of plastic and aluminium windows installed in the building
Gabriel, Jindřich ; Skříček, Darek (referee) ; Šťastník, Stanislav (advisor)
The bachelor thesis deals with the thermal insulation of individual parts of doors and windows made of aluminium and plastic profiles. At the same time, the manufacturing processes for the production of these openings of the building structures are described. In addition, the requirements for placing the product on the market and the assessment of utility properties according to the currently valid standards are summarized. Contemporary profiles, insulating glass, spacing frames, window and door fittings and thermal treatments are also described. The practical part of the bachelor thesis is devoted to the determination of the temperature distribution, the temperature gradient and the distribution of the heat flows on the selected window type for four different ways of incorporation into the building structure. In conclusion, all the findings are summarized and a discussion about the achieved results is made.
Wing design of the gliders
Löffelmann, František ; Weis, Martin (referee) ; Jebáček, Ivo (advisor)
Thesis treats influences of geometrical characteristics on aerodynamic wing properties generally meaning, wing construction load and describes typical wing design. Next there are introduced basic requirements on gliders, according to regulation CS-22. Consequently there are described composite structures and there is sketched their design. There are described wings of two different present high-performance sail-planes (Schleicher ASW 22, SZD56-2 Diana-2). Finally there are compared modern gliders, their performances and on this basic there are compared performances of 15-metre Class and 18-metre Class.
Design of winglet for LS-3 glider
Koutník, Tomáš ; Šošovička, Róbert (referee) ; Popela, Robert (advisor)
This diploma thesis describes the design of winglets for LS-3 glider. The method for determination of main winglet parameters based on selected criterion is presented as well as comparation of performace of original wing and final modification. It also includes analysis of wing loading and resetting of speed and weight limits for flying with winglets.
Overview of means for reducing induced drag
Mazánek, Adam ; Švec, Michal (referee) ; Daněk, Vladimír (advisor)
This bachelor thesis deals with the creation of overview of means for reducing induced drag on the wing of an airplane. It describes production of the induced drag and how it changes during a flight. The bachelor thesis also deals with geometrical modifications of the wing. The most extensive part is devoted to structural modifications of wing tips with special aiming on winglets.

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