|
|
Aerofoil Aerodynamic Features Optimization
Müller, Jan ; Popela, Robert (referee) ; Zelinka, Ivan (referee) ; Rozehnal,, Dalibor (referee) ; Ošmera, Pavel (advisor)
The content of the presented thesis is advanced optimization of the aerofoil wing of a general aircraft. Advanced metaheuristic optimization techniques based on evolutionary calculations and swarm algorithms are used for optimization. These algorithms are characterized by robustness of optimization and engineered degree of convergence and optimality of the solution. Within the solution, fundamental modifications of the original aerofoil optimizations were designed and implemented. A new variant of aerofoil evolutionary algorithms (aEA) was created from the original evolutionary algorithm (EA), followed by a new variant of aerofoil particle swarm optimization (aPSO) developed from the original particle swarm optimization (PSO). Then the hybridization of the mentioned methods was created in a parallel variant. The Bezier-PARSEC 3434 parameterization model that generates the aerofoil shape was used for the optimization process. A parametric model based on B-Spline was used to optimize the original aerofoil. Fluid dynamics simulation for the calculation of basic aerodynamic features (lift, drag, moment) was realized by Xfoil software. The results are then verified using fluid dynamics simulation (CFD ANSYS Fluent). From the point of view of optimization tasks developed by optimization and implementation, it is clear that this is a complex interdisciplinary task, the results of which are presented in this thesis.
|
|
| |
|
|
Design and functional morphology of insect wings
Jechová, Kateřina ; Prokop, Jakub (advisor) ; Janšta, Petr (referee)
Animal fly ability is undoubtedly one of the biggest innovation in evolution that allow animals to settle down another space on the Earth - the air. However, there are significant impacts on the other organisms during the evolution, too. The insect is single group of invertebrates with abilities to fly and because of that it became the most diversified group of organisms. There are a couple of theories about origin of the insect wings. Two major hypotheses considering the recent insects with their fossil record are widely known. Nevertheless, there is no direct clue to the first Pterygota due to the discontinuity of fossil record in the initial phase of their evolution The wing is very complex and unique structure throughout organisms. Insects became very good fliers during the evolution and wings are also used to protect of the body, carrying sensory organs, etc. Nevertheless, only very few insect species are well explored in term of flight and, an open theme for future studies. Aim of the present work is to describe the significance of the wing and to briefly review its morphological and design properties. Key words: Insecta, Pterygota, wing, venation, morphology, flight, evolution.
|
|
|
Rehearsal of shooting from the wing position in handball
Petružela, Jan ; Tůma, Martin (advisor) ; Kočíb, Tomáš (referee)
Title: Rehearsal of shooting from the wing position in handball Objectives: The aim of the work was to build and verify the training model for practicing and perfecting the shooting technique from the the wing position in handball. Based on the comparison and evaluation of each videoclip (before and after the intervention) five players tested, we found that this training model is effective. Methods: Five respondents players will be filmed during the shooting from the wing position, then the players go through during the months June and July seven training units, in the length thirty minutes, focusing on the progress of technique. After the completion of the training units, players will be filmed again and the videoclips will be compared with the original assessman. Results: In monitored group, a programme we have created caused a qualitative improvement the skills of all players. Key words: Wing, training, performance, intervention programme
|
|
|
Wing fatigue safe life investigation of single-engine multipurpose aircraft
Hubáček, Jan ; Juračka, Jaroslav (referee) ; Chybík, Ladislav (advisor)
Práce se zabývá stanovením bezpečné únavové životnosti křídla. Letadlo, které bylo podrobeno analýze, je vzpěrový hornoplošník celokovové konstrukce. Letadlo je certifikováno na základě předpisu FAR 23 Amendment 23-46. Výpočet bezpečné únavové životnosti musí být proveden v souladu s požadavky předpisu FAR 23 a jeho poradními oběžníky.\\ Teoretická část práce je věnována hlavně přehledu literatury a představení projektu, kde byla stručně shrnuta jeho historie vzniku. Část přehledu projektu také pojednává o podstatě požadavku na posouzení bezpečné únavové životnosti zadavatelem. V další části byl rovněž proveden rozbor literatury týkající se únavy. Jednalo se zejména o rozbor předpisu FAR 23, jeho poradních oběžníků a obecně literatury vztahující se k únavě jak v letectví, tak v obecném strojírenství.\\ Druhá část diplomové práce byla zaměřena zejména na výpočetní analýzu a vývoj specializovaného software. Výpočetní část obsahovala zejména přípravu vstupů, včetně obálek zatížení, stanovení typického letu, výpočet zatížení křídla a napjatostní analýza ve vybraných řezech křídla. Z výstupů prvotní analýzy se následně provedl výpočet poškození a životnosti pro daný typový let.
|
|
|
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.
|
|
|
The growth and development of wings during ontogeny with emphasis on Palaeodictyoptera
Rosová, Kateřina ; Prokop, Jakub (advisor) ; Sroka, Pavel (referee)
The series of two fossil species belonging to the order Palaeodictyoptera from the Late Carboniferous of Kuznetsk Basin in Russia were re-examined. The two species as Tchirkovaea guttata and Paimbia fenestrata were investigated with emphasis on the wing growth and development in comparison with the structure of developing wings in recent mayflies. This fossil material of T. guttata and P. fenestrata was long considered by previous authors as undisputed evidence for a unique type of wing development in the Palaeozoic insects. The idea was that the larvae of these insects possessed the wings, which became articulated and fully movable already earlier during the postembryonic development and that these gradually growing wings changed their position from longitudinal to perpendicular to the body axis. Moreover, the development was supposed to include two or more subimaginal instars, implying that the fully winged instars moulted several times during postembryonic development. After detailed study of the available fossils and subsequent comparison of the fossil evidence with the development of wings in the recent mayfly Cloeon dipterum it was discovered, that the alleged series of immature, subimaginal and imaginal wings of T. guttata and P. fenestrata do not provide clear evidence that would support...
|
|
|
Design of new konception of the structural design of the main wing hinges of the Z 242
Hála, Aleš ; Augustin, Petr (referee) ; Píštěk, Antonín (advisor)
This diploma thesis deals with modernization of the Z 242 L aircraft wing. The main emphasis is given to the connection of the wing and fuselage. The new concept of both main and rear wing spar is designed together with integral fuel tank. The strength of the structure is evaluated analytically and numerically by use of Finite element analysis. Wide range of milling operations is implemented into manufacturing process as well. This thesis shows how to innovate current aircraft with respect to feasibility of the design in case of future project realization.
|
|
|
Aircraft Flight Controls Actuator - Modeling and Control
Kolář, Bohumil ; Kopečný, Lukáš (referee) ; Pohl, Lukáš (advisor)
The aim of this bachelor thesis is to compile and control the actuator model, which approximates the behavior of a real actuator under load. The work describes individual types of actuators and their properties. The mathematical model of the actuator is also described. This model consists of a motor and a load. The mathematical model is applied in the Simulink environment where a control structure was designed and added. The work also describes the construction of the real actuator and its subsequent testing in the ControlDesk. The results of the individual test are in the form of step responses.
|
|
|
Preliminary aerodynamic analysis of remotely controlled model with jet propulsion
Novák, Ondřej ; Zikmund, Pavel (referee) ; Popela, Robert (advisor)
This bachelor´s thesis deals with aerodynamic analysis of unmanned aircraft and subsequent changes to design of wing, its position and wing-fuselage junction. In this work emphasis is laid on flow separation, its interaction with other flow structures and its influence on aerodynamic properties. The goal of these changes to the aircraft is ensuring sufficient stability and controllability in low as well as high angle of attack flight. AVL, XFLR5 and CFD methods were used in the thesis. In case of inaccuracy of CFD calculation, two backup wing related modifications were prepared.
|
guest ::
