National Repository of Grey Literature 25 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Influence of the grease aging to its behavior in the vicinity of the elastohydrodynamic contact
Navrátil, Marek ; Dzimko, Marián (referee) ; Košťál, David (advisor)
This thesis aims to describe the differences in grease behaviour caused by degradation. Observation of EHL contact and its surroundings is done using optical fluorescence, which allows to measure lubricant thickness even if it is discontinuous and air is present. New grease is observed, along with samples aged in bearings. One sample was worked for 1000 hours, which was the planned duration of the experiment. Two other samples were stopped prematurely after approx. 900 hours. Several possible age-related factors were examined and strong link between contamination and grease behaviour was found. In observed cases, contamination was identified to be the leading cause of lubricant shortage near EHL contact, which is one of possible bearing failure causes. The results expand existing knowledge about grease lubrication topic, but much further research is needed.
Types of rolling bearings wear
Kapusta, Juraj ; Košťál, David (referee) ; Zapletal, Tomáš (advisor)
The aim of this bachelor thesis is to classify the rolling bearing wear from the very origin, the course in the operating state and the resulting quality of the component until the complete elimination. The design and subsequent production guarantee the life of the part, when the required working hours work safely. The designer's role in designing a bearing selection for a given bearing, lubrication and load transfer is to take into account all factors that could lead to damage. In practice, the customer's choice of bearing is recommended according to various computational methods that ensure optimal selection of a standardized bearing from the catalog. The individual parts contain values specifying the strength and dynamic properties that the customer can handle. The result will be a survey of several real companies, analysis of their implementation and accessibility of modules to facilitate the selection of the correct bearing. To do this, I try to make the issue of wear and tear accessible, which is related to the prevention of these undesirable effects.
Modification of the test rig for the testing the bearings for the space applications
Okál, Michal ; Křupka, Jiří (referee) ; Košťál, David (advisor)
This bachelor thesis deals with the design of a device, which allows exploration of rolling bearings properties in space conditions. The adjustment is necessary for testing of a new rolling bearing with different dimensions. Preload of the bearing must be centered and adapted for rapid heat exchange with the surroundings. The effort is made to use maximum number of existing components and torsion stiffness of the device. The thesis outputs are the accompanying report and the technical documentation allowing the production of new components.
Design of a multifunctional leg rest box
Schmidtová, Markéta ; Košťál, David (referee) ; Svoboda, Petr (advisor)
The bachelor thesis deals with the design of a multifunction car box, which increases the comfort of children in car seats. The first part will describe requirements for ergonomically correct seating and development of the child. The height positions will be defined from these data and then the design solution will be executed. In the end stressed states and optimized solutions will be proposed.
Desing of the carbon cap for the bike's fork
Gallo, Dominik ; Čípek, Pavel (referee) ; Košťál, David (advisor)
This bachelor's thesis discusses problems and solutions of design of the carbon crown for the bike's fork. It shows an overview of the possible implementation of the initial design up to final part. The output will be the crown made of carbon composite by mould pressing. For manufacturing the prototype form will be used 3D printing – Fused Deposition Modeling.
Design of the twin-ball contact simulator
Navrátil, Marek ; Svoboda, Petr (referee) ; Košťál, David (advisor)
The goal of this bachelor thesis is to create design draft of ball-on-ball contact simulator, which would enable further research of starvation phenomenon, more specifically ratio of distribution of lubricating films onto two rolling elements with circular and elliptical geometry of contact.
Influence of the surface roughness features on the next rolling bearing element
Saksa, Vladimír ; Zapletal, Tomáš (referee) ; Košťál, David (advisor)
This bachelor thesis deals with investigation of influence of the surface roughness features on the next rolling bearing elements. It researches changes in the film profile entering into the contact. This thesis describes also elastohydrodynamic lubrication regime by witch each rolling bearing works as well as the difference between fully flooded and starvation contact of rolling ring with rolling bearing element. The part of the thesis is the experiment using different kinds of lubricats from which is visible really influence of these contacts. This experiment is realized on the contact simulator and the film thickness is measured using method of optical interferometry.
Surface tension measurements
Hála, Ondřej ; Vimmr, Jan (referee) ; Košťál, David (advisor)
The thesis deals with study of surface tension of liquids and measuring possibilities of this parameter. The paper is then focused on design of measuring apparatus based on pendant drop method. The apparatus is controlled with software written in Matlab. Several measurements are done at the end of this work, which confirm possibility to practical use of this apparatus for surface tension measurements. A part of this work is manual to use the apparatus and complete design documentation.
Desing of the carbon cap for the bike's fork
Gallo, Dominik ; Skřivánková, Vendula (referee) ; Košťál, David (advisor)
This bachelor's thesis discusses problems and solutions of design of the carbon crown for the bike's fork. It shows an overview of the possible implementation of the initial design up to final part. The output will be the crown made of carbon composite by mould pressing. For manufacturing the prototype form will be used 3D printing – Fused Deposition Modeling.
Design of the clamping system for elastohydrodynamic contact simulator
Repatý, Michal ; Šperka, Petr (referee) ; Košťál, David (advisor)
The aim of this thesis is to design and construct a clamping system for glass disc used in elastohydrodynamic contact simulator. The clamping system must be able to center, eject and at the same time quickly and securely fasten the disc. Increased demands on accuracy and rigidity of the system are stressed as it is a laboratory measuring instrument. The thesis contains an accompanying report, drawings of components and assembly drawings.

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2 Košťál, Daniel
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