National Repository of Grey Literature 158 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Optimization of Light Jet Aircraft Air-brake Bracket
Kopecký, Marek ; Maňas, Pavel (referee) ; Koutný, Daniel (advisor)
The master thesis deals with a design of an air brake bracket for a light jet aircraft. The shape of the bracket was topologically optimized and manufactured using Selective Laser Melting technology using the AlSi10Mg material, resulting in a 37% reduction in weight. The component was verified using FEA. The real prototype was destructively tested to determine its behaviour and then was compared with the FEA simulation. The testing also confirmed that the bracket complies with the given load conditions and has almost five times greater load capacity compared to the operating load. The new design of the lightweight bracket will increase the range of the aircraft and reduce the carbon footprint.
Design of a chamber for storing metal powders
Jeleček, Petr ; Červinek, Ondřej (referee) ; Koutný, Daniel (advisor)
Additive manufacturing from metallic materials is a continously evolving branch of the engineering industry, where correct material storage is a crucial aspect. The main objective of this bachelor’s thesis is to create a structural design of a chamber for storing barrels containing metal powders. A survey of commercially available storage systems highlighted a gap in the market, specifically of fully or partialy automated storage systems that could also be used in a laboratory environment. The conceptual designs are inspired by commercially available storage systems and include a new, unconventional solution. After the evaluation of conceptual designs a specific structural design was developed that met the project criteria. The final design enables storing barrels containing metal powders in an inert atmosphere and partialy automates the transport of barrels between the storage and the work space.
Modification of the crystallographic texture of austenitic steel by 3D printing
Fábry, Adam ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
The microstructure, and therefore the mechanical properties of the material, depend on the cooling rate and the direction of the temperature gradient during cooling, which can be easily influenced in additively manufactured metal parts. In previous research, this change has been achieved by altering the scanning strategy during production. This work focuses on modifying the crystallographic structure of material X30Mn22 by varying the laser speed and power while maintaining a constant meander scanning strategy without rotation. To determine the applicable production parameters, a test of simple welds was conducted, providing a basis for future production and testing of bulk samples. The suitability of the production parameters and the microstructure achieved in the sample cross-section were evaluated using porosity on the fabricated bulk samples, and the microstructure was depicted using EBSD maps, showing significant changes in microstructure solely by altering the laser production parameters. Tensile samples were further fabricated for selected microstructure samples, and their mechanical properties were tested. The results of tensile tests showed differences between individual microstructures of 18% for yield strength and up to 10% for ultimate tensile strength. However, the most significant difference was in the achieved tensile modulus, which differed by up to 27%. The work provides fundamental insights into modifying and adjusting the structure of manganese-rich material by changing laser power and speed settings.
Design of paddle shifts for formula student
Dugas, Martin ; Vrána, Radek (referee) ; Koutný, Daniel (advisor)
This bachelor thesis concerns design of paddle shifters for Formula Student. It deals in theoretical part with knowledge of today’s shifting mechanisms, additive manufacturing technologies and ways of weight optimization of parts. In design section, it covers with actual solutions of this problems, whereas the most important target was to minimalize mass and maximize stiffness of the whole mechanism.
Development of process parameters for Selective Laser Melting technology for processing of aluminum alloy AlSi7
Zvoníček, Josef ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the study of the influence of process parameters of AlSi7Mg0.6 aluminum alloy processing using the additive technology Selective Laser Melting. The main objective is to clarify the influence of the individual process parameters on the resulting porosity of the material and its mechanical properties. The thesis deals with the current state of aluminum alloy processing in this way. The actual material research of the work is carried out in successive experiments from the welding test to the volume test with subsequent verification of the mechanical properties of the material. Material evaluation in the whole work is material porosity, stability of individual welds, hardness of the material and its mechanical properties. The results are compared with the literature.
Resonance and damping behavior of lattice structures produced by Selective Laser Melting
Lagiň, Adam ; Čížek, Petr (referee) ; Koutný, Daniel (advisor)
In reaction to the uptrend of additive manufacturing of lightweight structured metallic parts, this diploma thesis is focused on the resonant and damping behavior of micro-truss lattices produced by Selective Laser Melting (SLM) technology. Micro-truss structures already found usage in various types of optimizations. Therefore, the optimization of resonance or damping could be also assumed as possible. For this purpose, several finite element analysis approaches were used, including the referent solid element model and simplified beam models. Obtained results were verified experimentally via pulse modal analysis. Material and mechanical properties of samples for FEA results and experimental results comparison were unified through secondary experiments. The main goal of this research was to explore the behavior of resonance and damping of structures when their elementary parameters are changed. The results from both, numerical and experimental approaches confirm that the eigenfrequency and the damping ratio of the structure can be affected by the change in the truss diameter, cell size, or type of structure. The work also presents the successful methods for simplified beam model optimization, which guarantees its high precision in the wide field of tested samples. This newly obtained knowledge creates a comprehensive overview of micro-truss structures, which can be used for the conscious design of ultra-light parts with the required eigenfrequency and damping ratio.
Design of support structures for parts made of Inconel 718
Kuhajdik, Matej ; Hutař, Pavel (referee) ; Koutný, Daniel (advisor)
This master thesis deals by the design of support structures for the production of parts made of nickel superalloy IN718 using selective laser melting (SLM). The aim of this work is to design a support structure so that technological problems (excessive deformation of the part due to high residual stresses and insufficient heat dissipation) are eliminated and replace the use of massive volume support, which is inefficient in terms of design and production time, consumed material and postprocessing. Mechanical behaviour of residual stresses of built component, design points of selected support structures (perforated block with pins, BCCZ with perforated contour) and design recommendations were quantified by using thermo-mechanical simulations of production and series of experiments. The functional sample was tested by designing specific support structures for the turbine wheel with subsequent production. The support structure ensured safe, successful production without potential problems and met the requirement to minimize material consumption through effective large-scale perforation of the structure.
Positioning unit for laser spectroscopy
Brada, Michal ; Mazůrek, Ivan (referee) ; Koutný, Daniel (advisor)
This diploma thesis deals with design of positioning unit for laser spectroscopy and its realization to shape of prototype. The design of positioning unit is based on the analysis of the current state of knowledge in the field of remote laser spectroscopy systems. Precise harmonic drive and worm drive with stepper motors are used to drive. The main parts of positioning unit are designed primarily from duraluminium. The positioning unit will be used for experimental measurements at the Institute of Physical Engineering Faculty of Mechanical Engineering Brno University of Technology. 3D digital prototype and technical drawings were created in Autodesk Inventor 2010.
Design of camera crane
Navrátil, Pavel ; Hutař, Pavel (referee) ; Koutný, Daniel (advisor)
This Master’s thesis deals with several variants construction design of camera crane. Two optimal variants are chosen with regard to practical usage. The thesis includes complete design of these variants with 3D models and strenght analyses. This analyses are processed by final element method. The first variant made based on technical documentation and it has worked for company Filmochod s.r.o..
Geometric Accuracy of Additively Manufactured Test Parts
Ilčík, Jindřich ; Sehnoutka, Petr (referee) ; Koutný, Daniel (advisor)
The presented diploma thesis deals with the control of the geometric accuracy of the parts produced by additive manufacturing technology selective laser melting. The paper first analyzed the work of the other authors dealing with this issue. Based on obtained informations from this analysis were developed benchmark test parts for quality control of production on a commercial machine SLM 280 HL supplied by SLM Solutions GmbH. The work was carried out several tests to determine the appropriate parameters of construction parts. These tests, their results and conclusions are fully described in this papper.

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