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Methodology design and proper measurement setting evaluation of ultrasound testing of composite propellers
Běhal, Antonín ; Horák, Marek (referee) ; Katrňák, Tomáš (advisor)
This thesis focuses on non-destructive ultrasonic testing of composite aircraft propellers. The theoretical part contains a review of manufacturing technologies of laminate propellers and their design. The practical part of the thesis contains the design of ultrasonic testing methodology. Dolphicam 2+ device is used for testing. The creation of appropriate settings of the ultrasonic device, for different laminate thicknesses, is performed on calibration samples containing artificially created defects. By comparing the default and modified settings, it was found that the use of the modified settings greatly improves the distinguishability of the defects from the defect-free laminate. Confirmation of the functionality of the modified setup is performed using a real propeller test. The work serves as a sample procedure for testing a laminate propeller by ultrasonic defect detection.
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Improvement of Wood Properties in Aviation
Novosád, Matěj ; Katrňák, Tomáš (referee) ; Löffelmann, František (advisor)
The work focuses on improving the useful properties of wood in aviation using known methods of its modification. The structural and mechanical properties of wood are described together with a basic overview of some aircraft structures using wood. A substantial part of the work consists of a description of individual modification methods, including their impact on the mechanical properties of wood. The work ends with a summary of some suppliers of wood as a material for aircraft construction and also with a description of some new methods of modification.
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Study of crack retarders geometry modification effect on integral structural panel stability with the use of Finite Element method
Moštěk, Daniel ; Augustin, Petr (referee) ; Katrňák, Tomáš (advisor)
The master’s thesis concerns itself with evaluating the impact of four dimensional parameters of a specific type of crack retarder on improving the compressional buckling strength of an integral wing panel, using the finite element method. The improvements in buckling strength were particularly assessed with concerns to the added mass of the crack retarders. The crack retarders are composed of a so-called terminal section and so-called side branches. The thesis includes a literature review on the buckling of skin-stringer panels and an overview of crack retarder types. In the practical part of the thesis created FEM models of the examined variants are described along with the achieved results, which are subsequently evaluated. It was concluded that the examined parameters related to the terminal section significantly influence the increase of buckling strength of a given variant and are efficient concerning added mass. On the other hand, the examined parameters related to the side branches were deemed less significant and their alteration was inefficient in terms of added mass.
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Comparison of characteristics of pre-impregnated and conventional carbon fibre epoxy laminates
Jones, Phillip ; Juračka, Jaroslav (referee) ; Katrňák, Tomáš (advisor)
The focus of this thesis is a comparison of pre-impregnated and conventional carbon fibre laminates. The first part focuses on the production process of carbon fibre composites from the process of converting PAN to carbon fibres to the lay-up and curing process of completed parts. The second section includes numerical comparisons of different types of carbon fibre. The data is set up in a fashion to demonstrate the improvements in carbon fibre mechanical properties by comparing outdated carbon fibre to the newest fibre on the market. The included tables aid in the process of choosing the right type of carbon fibre for each specific application.
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Stress analysis and modelling of adhesive bonded joints with the use of Finite Element Method
Trubíniová, Karolína ; Horák, Marek (referee) ; Katrňák, Tomáš (advisor)
This bachelor’s thesis deals with the analysis of adhesive joints used in the aerospace industry by numerical solution using finite element method. The research section is focused on introduction to the topic of adhesive joints, the advantages and disadvantages they bring and their use in aerospace industry. The shear strength test using analytical approach is also part of this work. The practical part is focused on creation of 2D and 3D models of single lap joint test specimen and the subsequent strength analysis in MSC.Patran and MSC.Nastran. The output of this work consists of linear analysis of 2D and 3D problems, a non-linear analysis of 3D problem and comparison of results obtained by these methods.
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Online Dating: Impact of Online Dating Sites on Mate Selection
Mazáková Šetinová, Markéta ; Hamplová, Dana (advisor) ; Katrňák, Tomáš (referee) ; Fafejta, Martin (referee)
Markéta Mazáková Šetinová 13 Feb 2024 Online Dating: The Impact of the Internet on Mate Selection Dating has changed significantly over the last generation, both globally and in the Czech Republic. Perhaps the most significant change has been the influence of the internet and technology on the way people meet. This dissertation explores the evolving landscape of mate selection in the digital age, focusing on the impact of online dating platforms. Drawing on Czech and international research, the study investigates assortative mating patterns, age preferences, cognitive influences, and societal attitudes towards online dating. Employing a mixed-methods approach including data analysis from dating sites, surveys, and qualitative interviews, the research reveals a consistent trend towards assortative mating across various demographics from the first stages of mate selection. Findings suggest that while online dating expands opportunities for meeting potential partners, it also reinforces preferences for similarity and introduces new dynamics in mate selection. The study sheds light on the complexities of modern dating behavior, highlighting the interplay between individual preferences, societal norms, and technological affordances in shaping relationship dynamics.
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Wing design of competition aircraft
Jurda, Martin ; Navrátil, Jan (referee) ; Katrňák, Tomáš (advisor)
This bachelor thesis deals with wing design of the new competition aircraft for the SAE Aero Design East 2020 competition. Introduction of the thesis is focused on explanation and analysis of the rules taking into account wing design with the following analysis of the scoring equation. Following chapter deals with a research study on the concept of wing and the design of conceptual wing possibilities. Thesis continues with computational chapters containing calculations of the characteristics of designed wing and flight envelope load together with the wing load. The last part is a chapter including structural design of the wing and attachment of the wing to the aircraft.
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Wing system design of competition aircraft
Mahdal, Vít ; Hájek, Tomáš (referee) ; Katrňák, Tomáš (advisor)
This bachelor’s thesis deals with the wing system design of competition aircraft. The thesis consists of five main parts. The first part is an introduction to the competition – Air Cargo Challenge, and the mission of UAV. The second part details the compilation of flight envelope and loads acting on the aircraft. Part three describes stress analysis of the old fabric method of wing construction. Part four of the thesis gives suggestions of a new wing system design, and its stress analysis. The final part of this bachelor’s thesis describes the advantages and disadvantages of the new system design, and compares them to the old version.
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Structural design and stress analysis of ski landing gear for airplane with short take-off and landing
Hostinský, Vladimír ; Vaněk, František (referee) ; Katrňák, Tomáš (advisor)
The aim of this thesis is a design of a ski landing gear for the STOL Cruiser airplane and strength analysis of its parts with consideration of UL-2 and CS-LSA regulation requirements. First part follows the design process from a concept to detailed design. Decisions taken during the process and reasons behind them are discussed. In second part requirements of regulations for said aircraft’s landing gear are summarized and forces acting on the landing gear are calculated. This calculation is followed by a strength analysis of critical parts. Analysis of composite body of the ski carried out with a use of FEA and optimalization of its composite material layout is presented in a more detailed way.
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