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Design of turbocharger
Streďanská, Alexandra ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
Diploma thesis focus on the design of turbocharger in SW MS Excel. For required flow and pressure ratio, the thermodynamics parameters were calculated for the turbocharger. From these, geometry was designed and the condition of mediums was calculated for each part of the turbine and compressor. At last basic characteristics of the turbine and compressor on varying the regime of engine operation the rotation was made and offered an idea about the working point position.
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Design of a simulator module for analysis of friction and wear of teeth during cleaning
Snopek, Lukáš ; Streďanská, Alexandra (referee) ; Vrbka, Martin (advisor)
This thesis focuses on the design of a module for the tribological simulator Bruker UMT TriboLab, which will be used in research in the field of analysis of wear of hard dental tissues and filling materials due to tooth cleaning. The aim of this work was the design of experimental conditions, module construction, creation of drawing documentation, production and subsequent implementation of a validation experiment. The conditions of the experiment were determined on the basis of research and to create an optimal design solution, prototypes were continuously produced using the 3D printing method. Finally, two toothbrush fixtures and two dental filling sample fixtures were made based on the drawing documentation. Subsequent assembly of the fixtures and the implementation of the experiment on the tribometer verified their functionality, which makes it possible to declare all the goals successfully met. Now these fixtures will be part of several research tasks in the field of oral biotribology.
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Friction analysis of hip joint replacements with coated surface
Nosek, Matěj ; Streďanská, Alexandra (referee) ; Nečas, David (advisor)
This bachelor thesis focuses on the effect that results from applying a coating to hip joint replacement based on the friction coefficient. The aim of this thesis was to conclude a comparison between individual combinations with and without coating in three types of fluids. Experimental measurements were conducted in configuration ball-on-head in a pendulum hip joint simulator. For these measurements, DEWEsoft, MATLAB, and MS Excel were used. During the measurements, four balls, two cups, and three fluids were used. The coating is a polymer-based solution made out of PEGMA-360 a PEGDMA-550. With the usage of the coating, gathered results point out that the coefficient of friction declines by a maximum of 5,4 % and increases by a maximum of 16,1 % compared to those without any coating. Results presented by this thesis may be in the service of further research of coatings and their application on hip joint replacement, which might increase the potency of those implants.
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Energy use of biomass
Streďanská, Alexandra ; Poláčik, Ján (referee) ; Baláš, Marek (advisor)
This bachelor thesis concerns on energy utilization of biomass. The main objective is to compare the combustion process of agropellets and wood pellets. This matter may be divided into two main parts. The first part focuses on research. It discusses the division of biomass and its properties. The second part is fully experimental. It focuses on experimenting with boiler efficiency calculations and describes these experiments. It also addresses the differences in combustion of given kinds of fuels and the subsequent evaluation of the measured results.
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Friction investigation of coated materials for joint implants
Gelnar, Adam ; Streďanská, Alexandra (referee) ; Nečas, David (advisor)
This bachelor thesis deals with the comparison of the coefficient of friction of different types of DLC coatings applied on two materials used for joint replacements. The experiments also aim to compare the friction as a function of the material pair combination. The friction tests were performed on a Bruker UMT TriboLab tribometer in a pin-on-plate configuration. The surface topography before and after the tests were also analyzed. The measured results show that the pins have lower friction coefficient values against the UHMWPE plate than against the glass. The uncoated samples, although having lower friction values, showed some signs of wear after the tests, while the pins with DLC coatings did not. In view of these findings, it can therefore be assumed that surface modification of commonly used materials with DLC coatings can lead to an extension of the lifetime of joint replacements, and therefore to significant advances in implantology.
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Friction analysis of hip joint replacements with coated surface
Nosek, Matěj ; Streďanská, Alexandra (referee) ; Nečas, David (advisor)
This bachelor thesis focuses on the effect that results from applying a coating to hip joint replacement based on the friction coefficient. The aim of this thesis was to conclude a comparison between individual combinations with and without coating in three types of fluids. Experimental measurements were conducted in configuration ball-on-head in a pendulum hip joint simulator. For these measurements, DEWEsoft, MATLAB, and MS Excel were used. During the measurements, four balls, two cups, and three fluids were used. The coating is a polymer-based solution made out of PEGMA-360 a PEGDMA-550. With the usage of the coating, gathered results point out that the coefficient of friction declines by a maximum of 5,4 % and increases by a maximum of 16,1 % compared to those without any coating. Results presented by this thesis may be in the service of further research of coatings and their application on hip joint replacement, which might increase the potency of those implants.
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|
Design of a simulator module for analysis of friction and wear of teeth during cleaning
Snopek, Lukáš ; Streďanská, Alexandra (referee) ; Vrbka, Martin (advisor)
This thesis focuses on the design of a module for the tribological simulator Bruker UMT TriboLab, which will be used in research in the field of analysis of wear of hard dental tissues and filling materials due to tooth cleaning. The aim of this work was the design of experimental conditions, module construction, creation of drawing documentation, production and subsequent implementation of a validation experiment. The conditions of the experiment were determined on the basis of research and to create an optimal design solution, prototypes were continuously produced using the 3D printing method. Finally, two toothbrush fixtures and two dental filling sample fixtures were made based on the drawing documentation. Subsequent assembly of the fixtures and the implementation of the experiment on the tribometer verified their functionality, which makes it possible to declare all the goals successfully met. Now these fixtures will be part of several research tasks in the field of oral biotribology.
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Design of turbocharger
Streďanská, Alexandra ; Šnajdárek, Ladislav (referee) ; Škorpík, Jiří (advisor)
Diploma thesis focus on the design of turbocharger in SW MS Excel. For required flow and pressure ratio, the thermodynamics parameters were calculated for the turbocharger. From these, geometry was designed and the condition of mediums was calculated for each part of the turbine and compressor. At last basic characteristics of the turbine and compressor on varying the regime of engine operation the rotation was made and offered an idea about the working point position.
|
|
|
Energy use of biomass
Streďanská, Alexandra ; Poláčik, Ján (referee) ; Baláš, Marek (advisor)
This bachelor thesis concerns on energy utilization of biomass. The main objective is to compare the combustion process of agropellets and wood pellets. This matter may be divided into two main parts. The first part focuses on research. It discusses the division of biomass and its properties. The second part is fully experimental. It focuses on experimenting with boiler efficiency calculations and describes these experiments. It also addresses the differences in combustion of given kinds of fuels and the subsequent evaluation of the measured results.
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