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Conceptual design of a hydrogen powered ultralight aircraft
Vrana, Andrej ; Zikmund, Pavel (referee) ; Koštial, Rostislav (advisor)
This master’s thesis deals with the conceptual design of a small ultralight aircraft, that uses hydrogen as its main fuel source. The thesis describes the main problem of hydrogen utilization in the aviation industry and provides the reader with an overview of existing aircraft with this power source. The design consists of a selection of suitable powerplant components, which was made after extensive research, and of the aircraft geometry design itself. The basis of the whole powerplant is a fuel cell, which produces electric energy from hydrogen, that drives a propeller via an electric motor. The aircraft geometry design was made according to CS-LSA regulations and is largely based on statistical values of dimensions of aircraft from the same category. The conceptual design is provided with a weight and balance analysis, a flight envelope according to regulation and an analysis of basic flight performance. In the end, a conclusion was made about the feasibility of operation of such an aircraft and about the compliance with regulation.
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The possibilities of optimization of the control elements in the cabin of the L-39NG aircraft
Klečák, Filip ; Zikmund, Pavel (referee) ; Procházková, Hana (advisor)
An effective cockpit design is one of the main prerequites for creating a succesful aircraft. This statement is even more pronounced in the sphere of military aviation, where perfect synergy is usually required between the pilot and the aircraft. This thesis focuses on optimization of control elements in the cockpit of the Aero L-39NG aircraft, a new trainer airplane designed by the czech company Aero Vodochody AEROSPACE. This airplane belongs to the jet trainer airplane category, representing an important role in training military pilots progressing towards fighter airplanes. The chosen method of conduction is a research of similar trainer airplanes as well as modern fighter airplanes, examination and comparison of used control elements and equipment. The main objective is to create suggestions of possible cockpit opimizations according to the trends observed in the studied aircraft.
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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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Airborne wind energy system
Killioglu, Can ; Popela, Robert (referee) ; Zikmund, Pavel (advisor)
The master's thesis deals with the issue of flying wind turbines, which is an innovative area of renewable energy. The main advantage of these power plants over conventional wind turbines is their ability to reach higher altitudes and thus take advantage of stronger wind conditions. An important part of the thesis is the aerodynamic analysis of the rotor in autorotation mode, which investigates the behaviour of the propeller rotor. Furthermore, the conceptual and structural design of a selected type of flying wind turbine is carried out.
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Conceptual design of air- mobil
Podhorský, Matěj ; Zikmund, Pavel (referee) ; Píštěk, Antonín (advisor)
The topic of the thesis is a conceptual design of a roadable aircraft. The comparison of existing concepts is made, as well as description of proposed solution, aircraft mass analysis, basic aerostatic calculations, flight and gust envelope calculation and a design of truss construction of the fuselage. The CS-VLA, alternatively ELSA-K, has been used as a certification base. The compliance to this certification specification is one of the goals of this thesis.
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Flight performance of competition RC airplane
Majtán-Černák, Tomáš ; Zikmund, Pavel (referee) ; Hájek, Tomáš (advisor)
This Bachelor thesis is dealing with designing procedures for measuring flight performances of aircraft model, built according to Air Cargo Challenge 2015 competition regulations. Firstly, the competition is introduced, together with its requirements and regulations. Then, aircraft with its basic design parameters is presented. As a basis for designing flight test, thesis includes introduction of theory on this matter. Finally, Bachelor thesis contains measurement methodology itself as well as evaluation of the results.
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Joystick with variable force
Peťovský, Dan ; Horpatzká, Michaela (referee) ; Zikmund, Pavel (advisor)
This thesis deals with the design of joystick mechanism with force feedback function. The first part contains description of forces in the control of aircraft and description of the mechanisms used for the joysticks with force feedback function. The second part contains the design of the mechanism and knowledge in completing the prototype.
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Flight performance of racing RC gliders
Hájek, Tomáš ; Zikmund, Pavel (referee) ; Pejchar, Jan (advisor)
Bachelor thesis is about flight performance of category F3K, radio-controlled gliders. It has list of flight tasks performed during competition and characteristics of different flight modes. The paper presents important performance characteristics and the methodology for their measurement.
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