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Bearings for space
Vavřík, Petr ; Nečas, David (referee) ; Košťál, David (advisor)
Currently, space satellites in orbit are required to operate reliably for more than 10 years. This places high demands on the satellite's tribological systems, which must function properly in the hostile space environment for this period. This bachelor thesis deals with the description of suitable bearings and their lubrication for space applications. Lubrication regimes are described at the outset. Then, space factors affecting the proper operation of tribological systems are summarized. The largest part is devoted to the description of the most used bearings and lubricants. The thesis concludes with the design of suitable bearings and their lubrication for the satellite reaction wheel.
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An overview of oils and their engineering applications
Kozák, Ondřej ; Frýza, Josef (referee) ; Šperka, Petr (advisor)
This Bachelor´s thesis deals with an overview of current state of knowledge of lubricating oils and their engineering applications. It includes characteristic and division of oils by manufacturing method and division of these oils by chemical structure. Basic compounds of oils including most used types of additives are mentioned and described. Next part of the thesis focuses on lubricant properties. Final part includes resume of applications in which the listed oils are applied and required properties for each type of application are mentioned.
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Shaft seals and stuffing boxes of pumps
Pluskal, Tomáš ; Dobrovolný, Martin (referee) ; Štefan, David (advisor)
Pumps are an integral part of industry, agriculture, but also everyday life. One of the main elements that affect the proper function and reliability of these machines are shaft seals and gaskets. The first part of this work deals with individual types of shaft seals and gaskets, their design, application, function and used materials. In the second part, a suitable seal for the selected pump is dimensioned.
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Marginal conditions and their influence in the production of reinforced steel fibres in concrete
Loyková, Markéta ; Řiháček, Jan (referee) ; Císařová, Michaela (advisor)
Constantly increasing demands of customers for the speed of realization of the construction and reduction of all input costs have been reflected in civil engineering by high demand for reinforced steel fibers in concrete. The steel reinforcement has significant role in this composite material. This means that reinforcement (wires) provide the required physicochemical properties to the concrete. It is necessary to pay attention also to the marginal conditions and their influences in the production of wire. In close cooperation with the companies Krampe Harex CZ and Cemex Czech Republic, an analysis of the conditions of the drawing process and subsequent influence of dispersed steel reinforcement on the final product was created. The economic aspects of the production of dispersed steel reinforcement in concrete were also mentioned.
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Design of experimental device for visualization of axial forces in bolted connections
Ptáček, Tomáš ; Galas, Radovan (referee) ; Svoboda, Petr (advisor)
In the bachelor's thesis is created design experimental device that will be able to measure preload in bolted joints. The first part of thesis deals with research study of the current state of knowledge of bolted joints, depending on the use of different types of lubricants. According to informations, 3 different variants are introduced. The selected variant is described in detail with their advatnages and disadvantages. The final design is developed into technical drawing and electronic 3D models.
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The role of lubricants in sheet metal forming
Čvanda, Petr ; Novotný, Karel (referee) ; Peterková, Eva (advisor)
This project which was elaborated in the bachelor education present summary of lubricants in technology of forming. Annotation was based on belles-lettres of problematic of these lubricants in technology of forming and include individual sorts of lubricants and their applications in variety of forming operations
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Lubricants created by nature
Drobilič, Ivo ; Urban, Filip (referee) ; Nečas, David (advisor)
This bachelor thesis provides an overview of substances which can be considered as the lubricants in its natural environment. The first part of the thesis of focused on lubricants in human body. The substances such as water, blood or synovial fluid are analysed in a detail. The following chapter deals with lubricants in everyday life. As the example, decrease of tyre adhesion in case of rain or longer breaking distance of trains as a consequence of presence of leafs on rails, can be mentioned. The last part, in addition, summarizes the lubricants which are based on natural products.
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Lubricants for forming technologies
Tollrian, Zdeněk ; Císařová, Michaela (referee) ; Šlais, Miroslav (advisor)
This thesis deals with the lubricants used in metal forming technology. Requirements for lubricant, grease and selection process of forming the necessary information to determine the desired properties of the lubricant. The thesis presents an overview of lubricants that are used in various forming processes, their distribution and use. In each chapter the types of lubricants that are used in engineering practice.
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Condition-based Lubrication System
Kroliczek, Václav ; Nohál, Libor (referee) ; Svoboda, Petr (advisor)
This work provides a review of actual information about condition-based lubrication systems for roller bearings to make longer their durability. The first part describes current types of bearings, their lubrication and adequate lubricants. The second part deals with condition-based lubrication systems.
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Contactless sealing
Klimek, Ľubomír ; Galas, Radovan (referee) ; Omasta, Milan (advisor)
The aim of this work is factually and comprehensibly process the available information of contactless shaft seal. The introduction deals with clarifying basic concepts, historical development, and dividing the seals in general. Then it details the basic principles, advantages and disadvantages, and application of magnetic and labyrinth seals. The information included in this work can provide a basic overview for readers seeking information about this issue.
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