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Possibilities of loading contact at tribological simulator.
Brada, Karel ; Koutný, Daniel (referee) ; Medlík, Jan (advisor)
In this bachelor thesis were discussed different possibilities of loading used by significant authors during the second half of the twentieth century in experimental studies of the elastohydrodynamic lubrication. Loading by weight through disc, weight through ball, spring, pneumatic, hydraulic, electrodynamic, and through the ball shaft has been described. Advantages and disadvantages of the loading possibilities were discussed along with their eventual application on the experimental apparatus situated at the Institute of Machine Design, Faculty of Mechanical Engineering, Brno University of Technology.
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Processing of aluminium alloys using 3D technology selective laser melting
Měchura, Lukáš ; Koutný, Daniel (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with finding of appropriate process parameters for minimizing porosity with SLM technology for processing aluminum alloy 6061. The search part deals about the issue of additive manufacturing aluminum alloys and evaluation of porosity measurements of relative density. Based on general knowledge were proposed test samples produced by sintering of metallurgical powder using a laser with ytterbium optical fiber. In this work was used high power of laser up to 400 W, with which 6061 alloy was not been in terms of porosity in detail tested yet. As the result, the technological parameters dependence on relative density and the overview of this alloy processing by SLM technology was determined.
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Design of stend for testing of prosthetic feet
Švachová, Michaela ; Paloušek, David (referee) ; Koutný, Daniel (advisor)
The Bachelor's Thesis first reviews the general body of knowledge related to biomechanics of gait. The paper also provides definition and classification of a lower leg prosthesis together with a review of the most widely used transtibial prosthesis testing methods. The project also provides description and loading conditions of the main d ynamical a nd s tatical t est o f a lower leg p rosthesis a cording t o E N Č SN 10 328. The paper starts with analyzing the problem and continues with construction solutions complaint with testing requirements. The main output of the project is a 3D model of a test stand design with pneumatic actuator created in Inventor 2013 with related calculations in MathCad 14. The project includes also an assembly drawing, drawings of the welded pieces and drawings of other components.
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Design of Transtibial Posthesis With Use of Additive Manufacturing Technology.
Kopecký, Martin ; Náhlík, Luboš (referee) ; Koutný, Daniel (advisor)
The thesis deals with the design of a transtibial prosthesis by additive manufacturing technology. Based on walking biomechanics and the current situation of knowledge a prosthetic foot has been designed for a patient with low level of physical activity. Furthermore, the thesis describes the design of an individual socket for the patient. The socket has been designed by reverse engineer procedure based on the three-dimensional geometry of patient´s stump obtained by 3D scanning. Testing samples of the foot and the socket have been made for the check of functionality of both the devices and then subjected to mechanical tests in accordance to the methodology regulation ISO 10328. Finally, the thesis depicts the FDM technology used for the production of functional samples of the designed devices; assembly of modular transtibial prosthesis and its testing by the patient.
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Process Parameters Development for Producing of Lattice Structures Using 3D Metal Printing
Moravčik, Jaroslav ; Koutný, Daniel (referee) ; Vrána, Radek (advisor)
Selective laser melting (SLM) belongs to additive technologies. Progressive adding of layers of material powder and creating the structure with laser beam allows to create components with complex shapes, for example microstructures. This thesis explores potential of new printing strategies, which could lead to good melting of printed component and reaching to better structure without porosities. Based on analysis of actual state, software for calculation of laser trajectory was made with use of new printing strategy. Also, process parameters obtained from technical articles and from experiments made on Institute of Machine and Industrial Design on Faculty of Mechanical Engineering BUT in Brno were compared. This comparison led to suggestion of test set of components with new parameters and strategies. This set could lead to new researches in this issue.
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Transtibial prosthesis for recreational in-line skating
Sabo, Karol ; Dočkal, Aleš (referee) ; Koutný, Daniel (advisor)
The master thesis deals with the engineering design and realization of a transtibial prosthesis for recreational in-line skating. The first part of thesis summarize background information about skating. The next part analyzes the kinematics of ankle joint based on gained information and own measurement by Motion capture method in Kinovea software. The thesis continues with realization of more versions of prosthesis followed by testing with patient. Finally, the thesis discus measured data.
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Modification of inert atmosphere circuit of 3D printer SLM 280HL
Somora, Jakub ; Maňas, Pavel (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the design modification of the circulation circuit of inert atmosphere in the 3D printer SLM 280HL. The aim of the proposed modifications was to increase the efficiency of condensate and flue gas removal and thus increase the quality of the production process. Based on experimental measurements of the velocity field at a height of 12 mm, it was found that in the original configuration of the build chamber, there are sites with reduced flow velocity. The test subsequently confirmed the increased porosity of the samples in the given localities. Subsequently, with the help of CFD simulations, a lower flow distributor was designed, which had the most significant effect on the porosity. Furthermore, an additional outlet and flow deflector were designed, which had the task of streamlining the drainage of condensate and fumes from under the protective glass of the laser. The designed components were manufactured and experimentally verified, which was able to prove the flow improvement and reduce the porosity on the platform. A test was also performed with a magnesium-based material, which proved more efficient removal of condensate and flue gases. The work managed to prove the influence of the flow velocity on the porosity of the component at differences in flow velocities above 0,3 ms^-1.
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Support structures for 3D printing from metallic materials
Hruboš, David ; Vrána, Radek (referee) ; Koutný, Daniel (advisor)
This bachelor’s thesis deals with additive technology selective laser melting, which allows creating 3D objects from metal powder. The support structures are required in this process to dissipate process heat and anchor the part to the base plate. Four new types of support structures were designed in this work. The functionality of the structures was verified and mechanical properties of structures were compared in a strength test.
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