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The effect of surface modification of acetabular cup on friction coefficient of hip implant
Cahová, Aneta ; Valena, Martin (referee) ; Nečas, David (advisor)
This bachelor’s thesis is focused on limited longevity of hip joint replacements. In order to extend the longevity of replacements effect of microtexture application on surface of artificial acetabulum cup on coefficient of friction was investigated. Attention was paid to composition of model synovial fluid and geometry and layout of texture. For joint simulation, a pendulum hip joint simulator was employed. In first part three femoral heads, two acetabulum cups and five fluids were tested, respectively two heads, four acetabulum cups and one fluid in second part. Significant effect of fluid composition and geometry and layout of texture was observed during measurement. Compared smooth and textured cup the highest decline of friction was 78 %. Results can be used for further research of micortextures. Friction reduction and prolonging lifespan of implants may eventually improve life quality of many patients.
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Design of corrugation measuring device
Valena, Martin ; Omasta, Milan (referee) ; Galas, Radovan (advisor)
This bachelor thesis describes the development of experimental corrugation measuring device. In the first part, mechanisms of corrugation formation and classification of corrugation, together with an analysis of measuring devices are described. According to the analysis, several design configurations were developed. The final variant is described in detail, together with the calculations. The output of this bachelor thesis includes complete technical drawings and price estimation.
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Design of wayside unit for top-of-rail lubrication
Valena, Martin ; Robenek, Dětřich (referee) ; Galas, Radovan (advisor)
This master’s thesis describes design and realization of a wayside unit for top-of-rail lubrication (TOR). TOR lubricant application causes wear reduction and lower noise emission. Firstly, patent analysis was provided and critically evaluated according to which requirements for developed device were specified – accurate dosage of small lubricant volume and high repeatability. On the basis of concept design, an experimental rig was created and used for lubricant application verification and spray lubrication parameter identification. Acquired results are considered in the final design of wayside unit with a technical facility. Two utility models were created within this master’s thesis.
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Design of the parametric model of the furnace carriage
Baláž, František ; Valena, Martin (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the creation of an algorithmic model of a cart into the furnace using Inventor software. The emphasis is mainly on the speed and simplicity of editing. The adjustment is based on the change of parameters that resulted from the assignment. Thanks to this work, the editing speed will be accelerated several times. The results can help other companies to implement parameterization in practice and subsequently accelerate production.
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Design of wayside unit for spraying of lubricant on rail
Jordán, Tomáš ; Galas, Radovan (referee) ; Valena, Martin (advisor)
Presented bachelor thesis deals with development and design of wayside unit for top of rail lubrication by spraying. TOR lubricant reduces wear and noise emission on the railways or tram rails. Introductory part of this thesis deals with lubricants properties and also units which are currently available on the market. The thesis contains proposal of wayside unit and it describes design solution. Based on a suitable design a prototype it was made. Furthermore experiments were carried out and their conclusion was that the unit is functional. The tests involved measuring of accuracy, repeatability and general analysis of spray pattern.
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Effect of operating conditions on tram noise in real traffic
Lounek, Kryštof ; Galas, Radovan (referee) ; Valena, Martin (advisor)
The bachelor's thesis investigates the influence of weather conditions on the squeal noise produced by the contact of the wheel with the top of the rail. Weather conditions are defined here as humidity, air temperature and the presence of rain. The thesis also compares specific trams in terms of their propensity to produce squeal noise and the parameters of the noise produced. The data sets used in the analysis come from a one-month period from a stationary module located near the track curve in the Brno-Komín tram loop. The graphical dependencies, which are the result of the work, describe a decreasing tendency of the average noise level depending on the humidity and an increasing tendency of the average noise level depending on the temperature. They also show a significant reduction in the occurrence of squeal noise during rain. As far as the tram comparisons are concerned, tram no. 1713 produces the most squeal noise, in fact in 86% of the cases. It also has one of the highest values of all noise parameters. The results of this work can help to explain the variable behaviour of squeal noise and can also be used to identify specific noisy trams.
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The modification of a field tribometer frame
Matějček, Ondřej ; Kvarda, Daniel (referee) ; Valena, Martin (advisor)
The main topic of this Bachelor thesis is a modification of a field tribometer frame. Firstly, the research of field tribometers measuring coefficient of adhesion on the real track was conducted. Next, the current state of the tribometer to be modified was analysed. Based on research and tribometer current state analysis the parameters of the design were determined. Followed by several conceptual variations of the frame and attachment mechanism. From these solutions, the best one was selected and processed into the final form. The results of this thesis are field tribometer frame with attachment mechanism. The Bachelor thesis also contains drawing documentation.
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Elaboration of examples for teaching dynamic simulations in Inventor
Skoupil, Tomáš ; Valena, Martin (referee) ; Okál, Michal (advisor)
This bachelor's thesis focuses on creating educational materials for dynamic simulations in the Inventor software. Its aim is to demonstrate how to work effectively in the environment of dynamic simulations and introduce students to the basic principles and procedures for their utilization. The main components of the thesis are two instructional presentations that serve as teaching materials for students. These presentations focus on assembling the trigger mechanism and reloading of a Glock pistol, which are suitable for demonstrating dynamic simulations in Inventor. By studying these presentations, students will acquire new knowledge and skills in the field of dynamic simulations. They will be able to understand the individual functions of dynamic simulations and gain the necessary skills for creating various mechanisms in the virtual environment of dynamic simulations. Overall, this thesis represents a useful tool for teaching dynamic simulations in the Inventor software and provides students with a practical foundation for working with this software.
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Design of the parametric model of the furnace carriage
Baláž, František ; Valena, Martin (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the creation of an algorithmic model of a cart into the furnace using Inventor software. The emphasis is mainly on the speed and simplicity of editing. The adjustment is based on the change of parameters that resulted from the assignment. Thanks to this work, the editing speed will be accelerated several times. The results can help other companies to implement parameterization in practice and subsequently accelerate production.
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Design of wayside unit for spraying of lubricant on rail
Jordán, Tomáš ; Galas, Radovan (referee) ; Valena, Martin (advisor)
Presented bachelor thesis deals with development and design of wayside unit for top of rail lubrication by spraying. TOR lubricant reduces wear and noise emission on the railways or tram rails. Introductory part of this thesis deals with lubricants properties and also units which are currently available on the market. The thesis contains proposal of wayside unit and it describes design solution. Based on a suitable design a prototype it was made. Furthermore experiments were carried out and their conclusion was that the unit is functional. The tests involved measuring of accuracy, repeatability and general analysis of spray pattern.
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