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Simulation of point contact lubrication by finite element method
Hrdonka, Štěpán ; Čermák, Jan (referee) ; Šperka, Petr (advisor)
This diploma thesis is concerned with simulation of elastohydrodynamic lubrication of point contacts using the finite element method. The first part of the thesis focuses on the study of the issue and introduces equations for model creation and numerical methods which can be used for EHD calculation. The most suitable solution approach has been chosen from the overview, namely the Full system approach. The software we chose for applying the method was COMSOL Multyphysics. The following part of the thesis deals with model’s creation and gives its elaborate description. We introduce models for calculation of line and point EHD lubrication for newtonian lubricants and, last but not least, we also present a model for calculation of point contact EHD lubrication for non-newtonian lubricants. The next part of the thesis then verifies all the models. That is achieved by comparing the calculated results to results from different papers. The conclusive part of the thesis then examines the matches of acquired results to different prediction relationships and experiments.
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Mechanical design of the supporting frame for a satellite antenna system
Hrdonka, Štěpán ; Mazal, Pavel (referee) ; Paloušek, David (advisor)
The aim of the Bachelor thesis is to create a structural drawing of a satellite dish supporting frame. The supporting frame will allow the dish to be mounted on a car. A part of the project is also to create a drawing of a rotating mount that will allow the satellite parabole to rotate around its vertical axis. Construction of the frame is designed to withstand required wind load and to prevent its sag from fundamentally influencing the signal quality. The stress-strain analysis has been carried out by using the Finite Element Method (FEM). Under the influence of the moment of 440 N.m around the –x axis and of gravitational force of 442 N the final maximal sag was 1.6 mm. The rotating mount is constructed in a way that requires only minimal maintenance and is able to withstand adverse weather conditions. That was accomplished by a suitible selection of materials. As the thesis is a part of mobile satellite prototype development, the project is designed in a way considering the final price and easy installation. Another part of the thesis is to create drawing documentation.
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Simulation of point contact lubrication by finite element method
Hrdonka, Štěpán ; Čermák, Jan (referee) ; Šperka, Petr (advisor)
This diploma thesis is concerned with simulation of elastohydrodynamic lubrication of point contacts using the finite element method. The first part of the thesis focuses on the study of the issue and introduces equations for model creation and numerical methods which can be used for EHD calculation. The most suitable solution approach has been chosen from the overview, namely the Full system approach. The software we chose for applying the method was COMSOL Multyphysics. The following part of the thesis deals with model’s creation and gives its elaborate description. We introduce models for calculation of line and point EHD lubrication for newtonian lubricants and, last but not least, we also present a model for calculation of point contact EHD lubrication for non-newtonian lubricants. The next part of the thesis then verifies all the models. That is achieved by comparing the calculated results to results from different papers. The conclusive part of the thesis then examines the matches of acquired results to different prediction relationships and experiments.
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Mechanical design of the supporting frame for a satellite antenna system
Hrdonka, Štěpán ; Mazal, Pavel (referee) ; Paloušek, David (advisor)
The aim of the Bachelor thesis is to create a structural drawing of a satellite dish supporting frame. The supporting frame will allow the dish to be mounted on a car. A part of the project is also to create a drawing of a rotating mount that will allow the satellite parabole to rotate around its vertical axis. Construction of the frame is designed to withstand required wind load and to prevent its sag from fundamentally influencing the signal quality. The stress-strain analysis has been carried out by using the Finite Element Method (FEM). Under the influence of the moment of 440 N.m around the –x axis and of gravitational force of 442 N the final maximal sag was 1.6 mm. The rotating mount is constructed in a way that requires only minimal maintenance and is able to withstand adverse weather conditions. That was accomplished by a suitible selection of materials. As the thesis is a part of mobile satellite prototype development, the project is designed in a way considering the final price and easy installation. Another part of the thesis is to create drawing documentation.
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