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Aerodynamic characteristics of airfoils
Foltýn, Pavel ; Cejpek, Jakub (referee) ; Koutník, Tomáš (advisor)
This bachelor´s thesis describes an influence of geometric characteristics of an airfoil on its aerodynamic properties. The first part of the thesis defines airfoil, describes its geometric characteristics, emergence of aerodynamic forces and convection around airfoil. The second part deals with influence of profile geometry on aerodynamic properties of airfoils. It is shown on NACA four and six digit profiles, in their buoyancy and moment lines and polars. The last part deals with wind tunnels and measurement in them. The thesis focuses on forces and moments measurement by force balances and static and total pressure measurement. Velocity measurement is focused on the laser Doppler velocimetry, on the hot-wire velocity probe and PIV method. Very briefly selected flow visualization methods are shown there. Comparison of profile characteristic obtained by measuring in wind tunnels and numerical simulation in Xfoil program is also shown there.
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Analysis of Aeronautical Composite Structures under Static Loading
Cejpek, Jakub ; Juračka, Jaroslav (referee) ; Cabrnoch, Bohuslav (referee) ; Jebáček, Ivo (advisor)
Poměrně velké množství soukromých firem v České republice vyrábí lehká sportovní letadla. Značná část těchto letadel využívá kompozitní pružiny ve svých přistávacích zařízení. Tyto pružiny jsou buďto menší díly, absorbující energii (na příďové noze či ostruze), anebo jde celé pružnice hlavního podvozku. Všechny tyto pružiny sdílí základní charakteristiky: jsou vyrobeny převážně z jednosměrného kompozitu s významnou tloušťkou, hlavním druhem zatížení je ohybový moment a jsou očekávány velké deformace. Podobnou charakteristiku můžeme použít i při popisu hlavního nosníku křídla. Jak vypadá návrh a analýza takovýchto dílů? V zásadě jsou dvě možnosti. První z nich je poměrně jednoduchá analytická analýza, případně naprogramovaná v tabulkovém výpočetním prostředí. Nevýhody tohoto řešení jsou limitované možnosti výpočtu a jeho nízká flexibilita. Druhou možností je využít komerční konečno-prvkový systém pro analýzu, případně i pro optimalizaci. Pochopitelnou nevýhodou této možnosti je cena programu a obsluhy. Cílem této disertační práce je vytvořit program, jež nabídne třetí možnost, která umožní provádět zevrubnou analýzu řešených produktů bez nutnosti pořizovat nákladný software. Tento program zjednoduší a urychlí návrh a pevnostní kontrolu. Umožní uživateli rychle analyzovat více návrhových variant. Program dále bude zohledňovat specifika analyzovaných produktů (například velké deformace a lokální koncentrace napětí kolmo na vlákno). Z pohledu uživatele by program měl být jednoduchý na ovládání. Minimum množství vstupních dat a přehledné grafické rozhraní zajistí komfortní používání. Samostatně spustitelný program (bez instalace a bez podpůrného softwaru) zlepšuje rozšiřitelnost programu.
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Rocket Engine Design
Cejpek, Jakub ; Konečný,, Pavel (referee) ; Třetina, Karel (advisor)
The objective of this study is to design a solid rocket fuel engine with sufficient power to propel 500 grams to 1500 meters of altitude. Furthermore to draft a design of a rocket that will utilize this category of solid rocket fuel engine. This study will begin with a theoretical exploration of the means to formulate the correct propellant closest to the theoretical solid rocket fuel formula. This section of the exploration will exclude the construction materials, technology, and the propellant availability. After the theoretical exploration the calculations will continue, respecting the availability of construction materials, technology, and the propellant; to investigate the means to formulate the correct propellant closest to the theoretical formula. Then, according to the new propellant formulation, re-design the engine.
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Sandwich structure application on the formula car
Žídek, Tomáš ; Cejpek, Jakub (referee) ; Löffelmann, František (advisor)
The master thesis describes application of a sandwich construction for Formula Student car. It will replace the current tubular space frame according to FSAE rules. The introduction is focused on the information of international Formula Student competition, including TU Brno Racing Team. Then there are important rules for the construction of frames and composite monocoques. For the selected production technology are found strength properties of face sheets made of carbon and hybrid fibres. Another part of thesis deals with the design of the sandwich panel using analytical calculation to determine the bending stiffness. On the basis of these proposals are made three-point bending and shear tests. Using of FEM simulation is detected torsional stiffness of the tubular space frame and the monocoque concept from the proposed sandwich panels. The conclusion is devoted to a summary of the important information and possible monocoque manufacturing process.
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Progressive Failure Analysis of Composite Material using Finite Element Methods
Častulík, Lubomír ; Cejpek, Jakub (referee) ; Mališ, Michal (advisor)
Bachelor thesis deals with possibilities of progressive failure analysis of layered composite plates. Firstly, there is a theoretical introduction to the mechanics of composite materials. Then the thesis deals with types of mechanisms of failure, including failure criteria, which can be used for their mathematical description. After that, there is presented necessary theory to understand an iteration calculation of progressive failure of laminates. Finally an application of gained knowledge to analysis of model sample for pulling test. This analysis was performed using MSC Patran/Nastran softwares.
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Development of rocket engines
Marcinko, Peter ; Cejpek, Jakub (referee) ; Koštial, Rostislav (advisor)
This thesis describes the development of rocket engines since the beginning to present time. The thesis is divided into three parts. The first describes the main physical principles, which have to be respected during the flight. The second part talks about the basic division of rocket engines and the used fuel types. Tle last chapter deals with Russian, American and European rocket program. It describes the main types of space rockets together with the engines they used.
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Survey of the Space Rocketplanes Development
Kapoun, Tomáš ; Cejpek, Jakub (referee) ; Daněk, Vladimír (advisor)
This bachelor thesis maps the historical and technical development of space shuttles from their inception to the present. In the introduction shuttles are divided into categories and then the reasons of formation of these machines are described. The second part deals with the development itself has various designs and not only the USA and the USSR, but describes the Space Shuttle in Europe and Japan. The penultimate chapter describes two tragic accidents USA Shuttles and their causes. The last part of this work is the conclusion with the intended development of astronautics in the near future.
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Tail units design of VUT 100 aircraft made out composite
Berka, Martin ; Cejpek, Jakub (referee) ; Mališ, Michal (advisor)
This Master´s thesis describes the design of composite horizontal tail of VUT 100 aircraft. Load calculation and selection of the critical load cases is performed. Internal structure of stabilizer and right elevator is designed. Construction materials are chosen and the structure of the composite materials is proposed. FEM models of stabilizer and the right elevator are created in MSC Patran system and consequently the strength test of the models for the selected load cases is executed using MSC Nastran software and COMPOST.
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Designe of a control system for powered sailplane SONG
Cejpek, Jakub ; Šplíchal, Jan (referee) ; Mališ, Michal (advisor)
The objective of this work is to adopt and further expand the type design of the SONG motor glider. The study will result in the basic aerodynamic calculation and the design of lateral control system including structural strength inspection of selected parts. Subsequently, the proposal will allow for further calculation to be made (of flight mechanics, wings strength or fuselage and empennage firmness) and for more specific constructional design of individual components of the glider.
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