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Using of detonation nanodiamond in tribology research field
Mauer, Milan ; Křupka, Ivan (referee) ; Svoboda, Petr (advisor)
The main objective of this bachelor thesis is to give a general knowledge about nanodiamonds, which are chipped off during the explosions diamonds. These particles are used as additions in lubricating preparations to decrease the friction. Bachelor thesis summarizes the basic characteristics, methods of manufacture and application nanodiamonds in practice. Part of this thesis is dedicated to theoretical and detailed descriptions of procedures and experimental results in nanodiamonds field of study. Another part describes different types of nanoparticles, used for the same purpose as nanodiamonds. The final part sums up the advantages of nanoparticles and its purpose for experimental or practical usage.
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In the Forrest
Pucharová Kramářová, Vendula ; Dub, Petr (referee) ; Lahoda, Tomáš (advisor)
My work began with taking photos in the forest at night; this work was very important to me because of the mysterious feeling. My paintings are stylized more than realistic. I'm captivated by untidy nature, with fallen trees and decaying stumps. Oil is my medium- some places are detailed while others are expressive.
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Numerical model of ultrasonic oil level sensor
Chutný, Pavel ; Bílek, Michal (referee) ; Vyroubal, Petr (advisor)
This master’s thesis verifies physical principle of ultrasound in fluids by numerical model. At first, ultrasound study is ment. In second theoretic part, diferent kind of motor oils are described. Next, equations for numerical simulation are presented. In practical part, numerical model of level sensor is examined in well-knowed fluids (water, air). Results of laboratory measurement on topic of ultrasound velocity in oil dependent on temperature are aplicated on numerical model of sensor and optimalized.
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Crankcase Ventilation of the Internal Combustion Engine
Zavadil, Martin ; Janoušek, Michal (referee) ; Drápal, Lubomír (advisor)
This thesis has been written out as a literature review. This work is focused on crankcase ventilation systems of internal combustion engines. The aim was to describe the origin of bow-by in different parts of engine, the principle of operation of individual components and a description of design solution for different types of engines. The work also describes the differences between crankcase ventilation systems of motorcycles and trucks. The last chapter is a description of used design solution of crankcase ventilation system for the selected engine VW 2.0TDI. In conclusion the work outlines possible developments in the field. The work also includes image attachments approaching the issue and design solutions.
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Design of the central housing for very low turbocharger support - sideways oil output
Slovák, Jan ; Novotný, Pavel (referee) ; Knotek, Jiří (advisor)
This diploma thesis is about lowering installation height of turbocharger without significant increase of the oil pressure inside the housing at the piston rings. At the beginning of the thesis is research about supercharging and turbocharging, construction and parts that are placed inside a turbocharger. Next chapter is short brief about CFD. Further chapters are about design and changes at the central housing and about simulations. From simulations were the results obtained.
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The Study of More Effectiveness Selected Technology of Maintenance
Mecera, Tomáš ; Mangl, Vladimír (referee) ; Jurová, Marie (advisor)
This diploma thesis deals with a proposal how to improve technology of mainte-nance of trucks and buses of ICOM transport branch in Humpolec. Main aim of this diploma thesis is the analysis of current technology of maintenance, especially the oil system and it´s modification. This aim was reached by suggestion of the new technol-ogy of oil system, technical eguipment and elaboration of new technical methods. Modern and efficient technology of oil system for trucking and repairation is the solution of this topic. That is the set of processes with operating system (monitoring) whitch guarantees safe, enviroment storage of oils, greases and antifreezer, their de-cantation and precise dosing during distribuion.
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Nanolubricants for practical applications
Sochor, Ondřej ; Frýza, Josef (referee) ; Svoboda, Petr (advisor)
This bachelor thesis is concerned with describing nanolubricants and enhancing their characteristics using suitable additives, such as nanoparticles. These can improve their tribological properties and reduce mechanical wear and friction between two surfaces. This thesis summarizes manufacturing, some features and mechanisms that apply to nanoparticles and nanolubricants. The main outcome of the work is a synthesis of acquired knowledge in the field of nanolubricants for the purpose of practical application and description of current trends in its research as being used as additives.
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Review of grease types
Mauer, Jindřich ; Ficza, Ildikó (referee) ; Košťál, David (advisor)
This bachelor thesis provides a basic distribution of greases according various aspects, which are used for lubrication the various components. The first part of bachelor thesis deals with the composition of greases. The following section describes the manufacture of greases. Another section includes the distribution of greases in terms of their composition. The following section is about distribution of greases in terms of practical use. The last part of the bachelor thesis deals with transmission electron microscopy, by this method is possible to examine the structure of greases.
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The use of fluid medium in forming technologies
Březina, Vít ; Peterková, Eva (referee) ; Podaný, Kamil (advisor)
This publication includes a research of currently used technologies with liquid as a forming or supporting medium. There is a description of methods of Hydroform, ASEA, Wheelon, Flexform, hydro-mechanical forming, Pillow hydroforming and groups of high-pressure, low pressure and pressure sequence hydroforming. The publication also includes analysis of the media used for lubrication of contact surfaces during the process of forming and operating fluids. The publication shows examples of companies which are using this technologies and samples of their products.
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Contribution to the Diagnosis of Power Oil Transformers
Šimková, Martina ; Poliak,, Ján (referee) ; Szabó, Radek (referee) ; Hammer, Miloš (advisor)
This dissertation thesis deals with the diagnotics of power oil transformer. It consists of the theoretical and practical part At its beginning, the theoretical part deals with an general description of the transformer and its connection. Focus is given to aspects of the life of the transformer insulation system (oilpaper). Further, the technical diagnostics is analyzed, with description of quantities of gasliquid chromatography, the oil condition and condition of conductor insulation. Another important part of the thesis consists of an expert system, which is described generally from the past to the present. Characteristics, types and structure of expert systems are mentioned here, with its advantages and disadvantages. The practical part starts with a description of the data file, which is further used in the thesis. Main practical part is divided into three parts - the results of gas-liguid chromatography, selected results and expert systems. In the section entitled "Results of gasliquid chromatography", there is an analysis of selected properties of time series and temperature dependency of gases. Moreover, the methods of the ratios of gases such as Duval Triangle method are described. The second part entitled "Selected other results" shows the time dependency of variables and the neutralization number, along with the breakdown voltage dependency, and time of dependency, gas and moisture content in insulating oils. There is also a temperature dependency of moisture content dissolved in insulating oil discussed, as well as results of selected correlations, such as the correlation values of gas chromatography with state variables insulation of wires. The last part, "Expert systems", provides specific information about developed expert system. It describes the environment chosen for its development, followed by a description, features and verification of the expert system. Examples of the consultation results are included. All achievements of the individual parts are always summarized at the end of each section. The thesis contains chapters "Objectives of the work" and "Conclusion". The most important chapter is "The contribution of the work." It contains original work results and the results applicable in industry.
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