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THIN LUBRICANT FILMS STUDY USING SPECTROSCOPIC REFLECTOMETRY
Čudek, Vladimír ; Dzimko, Marián (referee) ; Navrátil, Karel (referee) ; Dobeš, Petr (referee) ; Křupka, Ivan (advisor)
ectroscopic reflectometry is measurement technique that enables the study of the thickness and refractive index of thin layers. This thesis deals with its use for the study of lubrication films within EHD contact and verifies a new approach suggested in recent publications. It is focused on the development of an optical arrangement and mathematical model for the lubrication film thickness measurement within the entire EHD contact. This technique brings the possibility to study the pressure distribution within the contact area through the evaluation of changes in lubricant refractive index.
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Friction of compliant contacts
Vala, Martin ; Galas, Radovan (referee) ; Nečas, David (advisor)
This bachelor’s thesis deals with the study of the friction of compliant contacts and parameters affecting it. First section of this thesis provides analysis of current problematics with friction and compliant materials. In the next section basic definition of friction, compliant material and compliant contacts is provided with an actual study of up-to-date articles. Last section of this thesis is discussion dealing with all the articles and pointing out the influencing parameters. Followed by potential research pathways.
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Effect of lubricant rheology on lubrication film thickness.
Prášilová, Alena ; Šperka, Petr (referee) ; Křupka, Ivan (advisor)
Lubrication is a very important part of mechanical engineering, which ensures high lifetime of machine parts, reduction of friction and wear and also it leads to decreasing of power consumption. In this bachelor`s thesis there is described rheology of newtonian and non-newtonian lubricants and its effect on lubrication film thickness. Measured central film thickness values are compared with theoretical prediction.
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Optimization of hydrostatic bearing recess shape
Kopřiva, David ; Omasta, Milan (referee) ; Michalec, Michal (advisor)
This bachelor's thesis deals with the problem of optimizing the recess shape of a hydrostatic bearing. It describes the principle of operation of hydrostatic bearings, their use and previous recess optimizations. A circular recess is considered as the reference geometry. This is firstly investigated by analytical calculation and CFD simulation. The results from the analytical calculation and from the calculation using the CFD simulation are then compared in terms of accuracy of CFD simulation. After verifying the CFD settings, three types of geometry are proposed based on research and previous studies, and with the help of CFD, these geometries are examined with respect to hydrostatic bearing load capacity and recess pressure. All proposed geometry types are then compared with the reference geometry. The results show that the reference geometry has the best results in terms of bearing load capacity and recess pressure. From the point of view of asymmetrical loading and damping, the use of the proposed geometries seems to be more appropriate. This thesis describes a detailed procedure for setting up the CFD and can serve as a basis for further optimization.
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Friction of compliant contacts
Vala, Martin ; Galas, Radovan (referee) ; Nečas, David (advisor)
This bachelor’s thesis deals with the study of the friction of compliant contacts and parameters affecting it. First section of this thesis provides analysis of current problematics with friction and compliant materials. In the next section basic definition of friction, compliant material and compliant contacts is provided with an actual study of up-to-date articles. Last section of this thesis is discussion dealing with all the articles and pointing out the influencing parameters. Followed by potential research pathways.
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|
|
Optimization of hydrostatic bearing recess shape
Kopřiva, David ; Omasta, Milan (referee) ; Michalec, Michal (advisor)
This bachelor's thesis deals with the problem of optimizing the recess shape of a hydrostatic bearing. It describes the principle of operation of hydrostatic bearings, their use and previous recess optimizations. A circular recess is considered as the reference geometry. This is firstly investigated by analytical calculation and CFD simulation. The results from the analytical calculation and from the calculation using the CFD simulation are then compared in terms of accuracy of CFD simulation. After verifying the CFD settings, three types of geometry are proposed based on research and previous studies, and with the help of CFD, these geometries are examined with respect to hydrostatic bearing load capacity and recess pressure. All proposed geometry types are then compared with the reference geometry. The results show that the reference geometry has the best results in terms of bearing load capacity and recess pressure. From the point of view of asymmetrical loading and damping, the use of the proposed geometries seems to be more appropriate. This thesis describes a detailed procedure for setting up the CFD and can serve as a basis for further optimization.
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THIN LUBRICANT FILMS STUDY USING SPECTROSCOPIC REFLECTOMETRY
Čudek, Vladimír ; Dzimko, Marián (referee) ; Navrátil, Karel (referee) ; Dobeš, Petr (referee) ; Křupka, Ivan (advisor)
ectroscopic reflectometry is measurement technique that enables the study of the thickness and refractive index of thin layers. This thesis deals with its use for the study of lubrication films within EHD contact and verifies a new approach suggested in recent publications. It is focused on the development of an optical arrangement and mathematical model for the lubrication film thickness measurement within the entire EHD contact. This technique brings the possibility to study the pressure distribution within the contact area through the evaluation of changes in lubricant refractive index.
|
|
|
Effect of lubricant rheology on lubrication film thickness.
Prášilová, Alena ; Šperka, Petr (referee) ; Křupka, Ivan (advisor)
Lubrication is a very important part of mechanical engineering, which ensures high lifetime of machine parts, reduction of friction and wear and also it leads to decreasing of power consumption. In this bachelor`s thesis there is described rheology of newtonian and non-newtonian lubricants and its effect on lubrication film thickness. Measured central film thickness values are compared with theoretical prediction.
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