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Continuous wing design for a high-performance glider
Přikrylová, Helena ; Bartoněk, Jaroslav (referee) ; Juračka, Jaroslav (advisor)
The vast improvements in the field of aerodynamics and materials in the recent decades have brought significant changes in the geometry of sailplane wings. From the structural point of view, the maximum thickness of the used airfoils has decreased which in turn caused lowering the height of a spar. That necessitates strengthening of the spar flanges which again leads to shortening the distance between their opposite surfaces hence shortening the shear webs as well. Together with the need of sectioning in the cases of gliders with larger wingspans a question arises as to whether the conventional single spar design with wing connections in the glider’s longitudinal plane of symmetry by means of heavy spar extensions is the best possible solution. This thesis proposes a continuous wing design of a high-performance glider with the use of a two-spar and multi-web structure implementing a focus on determining of an appropriate sectioning.
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Increasing the safety of the operation of spacecraft in Earth orbits
Bartoněk, Jaroslav ; Kovařík, Vladimír (referee) ; Zikmund, Pavel (referee) ; Daněk, Vladimír (advisor)
This dissertation thesis addresses the most significant risks manned and unmanned missions in Earth orbit must face to. It states that the dominant risks are collisions with particles of Space debris, phenomena related to solar activity and galactic radiation. It notes that the solution of Space debris problems belongs to the engineering and application domain, while solar activity requires further scientific research. The review showed that the source of risk to Earth is primarily the solar corona. Thus, the thesis is focused on research of possibilities of its observation by artificial satellites from the point of view of celestial mechanics. Since the observation is only possible during total solar eclipse, the thesis deals with a previously unused method of solar eclipse observation by artificial satellites from low Earth orbit using the Moon as occulting body. It illustrates methods of calculation of orbital elements of these satellites, their important properties, advantages, and disadvantages. It shows that these orbits exist and lead to observations of duration fully comparable to usual ground-based eclipse observation. In an innovative way the solution of so-called Lambert’s problem is applied. This algorithm is used to find orbits leading to two successive observations separated by a given time interval. This allows more efficient use of time of the mission and provides more scientific data. Marginally, the use of the planet Mercury as occulting body is studied.
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Rejected aircraft prototypes
Moštěk, Daniel ; Bartoněk, Jaroslav (referee) ; Dubnický, Lukáš (advisor)
The bachelor thesis focuses on seven rejected prototype aircraft that took part in tendering processes in Western Bloc countries during the Cold War. The development history of each of these aircraft is summarized, their technical properties are specified, the reason of their rejection is explored, and a comparison is made between them and the preferred aircraft. An assessment of gathered information is then made resulting in the conclusion that studying these rejected prototype aircraft can lead to valuable insights.
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Adjusting mechanism of a small rocket engine for space exploration vehicles
Vrana, Andrej ; Popela, Robert (referee) ; Bartoněk, Jaroslav (advisor)
This bachelor’s thesis deals with designing adjustable gimbal mechanisms used for steering a small rocket engine and their depiction in 3D CAD models. The thesis is divided into two main parts. In the first part, spacecraft used for exploration of celestial bodies are described. All the spacecraft are described in detail, showing their mission phase, their design and technical parameters together with informations about their scientific discoveries, which they provided. The second part describes how rocket engines work with their division into main types and gives examples of rocket engines used in the aerospace industry. Furthermore, means of steering a rocket during flight are described, with also showing various ways of dealing with this issue. Finally, designs of of adjustable gimbal mechanisms are presented, with description of their usability.
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Optimal modelling of rivet joints using finite element method
Giorgobiani, Ioseb ; Katrňák, Tomáš (referee) ; Bartoněk, Jaroslav (advisor)
Diplomová práce je zaměřena na optimální modelování nýtového spoje pro tři různé konfigurace pomocí metody konečných prvků v programu MSC. Nastran/Patran. Na základě prezentovaných výsledků je možné virtuálně simulovat chování nýtových spojů při zatížení, za účelem správného návrhu před provedením statických pevnostních zkoušek. Použitím těchto MKP simulací v procesu certifikace výrobku lze významně redukovat časovou i finanční náročnost pevnostních zkoušek. Při lepším porozumění chování konstrukce lze také lépe predikovat reálnou únosnost nýtových spojů.
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Non-Traditional Aircraft Conception
Musil, Tomáš ; Bartoněk, Jaroslav (referee) ; Horák, Marek (advisor)
This bachelor thesis is about concepts of aircraft that are non-traditional in structural design or unconventional in different aspects. The individual chapters describe selected concepts and give specific examples of airplanes. The work is divided into two main areas according to the unusuality of concepts. Within chapters is the comparison of the given concept based on the chosen technical parameters and the pros and cons. The development and construction of airplanes are mentioned in examples. The conclusion of the chapter always contains a summary of the technical data.
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Angle of attack measurement system
Koribský, Denis ; Bartoněk, Jaroslav (referee) ; Zikmund, Pavel (advisor)
The aim of the bachelor thesis is to finish a system for measuring angle of attack and angle of sideslip during the flight. The system is based on two wind vanes that measure angle of attack by using a rotary magnetic encoder. The individual components were connected to Arduino and the program was adapted to these components by using software Arduino IDE. Measured data of the vane angle were after that saved on the SD card. After the system was assembled the vanes were calibrated by using the geometric template. Data of calibration were interpolated with trendline to get the function for calculation of real angle of attack.
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Design of a landing gear of an airplane competition kit
Gebrlín, Jakub ; Katrňák, Tomáš (referee) ; Bartoněk, Jaroslav (advisor)
The purpose of this bachelor thesis is to design a landing gear for a competition model of aircraft. The introductory part of this work is focused mainly on study about landing gears and their comparison in terms of advantages and disadvantages for the new competition model both in terms of arrangement and in terms of sliding or fixed chassis. In the second, the practical part the work is focused on computation of load, the strength calculation and the design of chassis.
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