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Performance and Safety Improvement of Large-Scale Hydrostatic Bearings
Michalec, Michal ; Wodtke, Michal (referee) ; Fillon, Michel (referee) ; Svoboda, Petr (advisor)
Táto dizertačná práca sa zaoberá experimentálnym a numerickým štúdiom veľkorozmerných hydrostatických ložísk. Takéto ložiská sa používajú na presné a plynulé polohovanie veľkých konštrukcií, pretože klzné plochy ložiska sú úplne oddelené externe tlakovaným mazacím filmom. Od jeho prvého oficiálneho predstavenia v roku 1852 prebehol rozsiahly výskum na zlepšenie výkonnosti. Napriek tomu sa výskumníci primárne zameriavali na hydrostatické ložiská malých rozmerov, zatiaľ čo len veľmi malá časť výskumu sa zameriavala na väčšie rozmery tohto typu ložísk. V takýchto prípadoch vznikajú úplne iné výzvy, ktoré sú spojené s vyššou energetickou náročnosťou, výrobou dielov ložísk, dopravou a montážou. Výrobné chyby, nesprávne zarovnanie ložísk alebo neoptimálna konštrukcia môžu zhoršiť výkonnosť ložiska, čo môže viesť až k jeho poruche. Cieľom tejto dizertačnej práce je predstaviť vylepšenia výkonu a bezpečnosti do rozsiahlej metodiky návrhu hydrostatických ložísk. Zlepšenie výkonu ložiska sa vykonáva pomocou numerického modelu oblasti tekutiny, ktorý je overený pomocou experimentálnych a teoretických údajov. Táto štúdia predstavuje úplne nový prístup založený na nezávislej optimalizácii viacerých geometrických parametrov hydrostatickej ložiskovej kapsy. Zlepšenie bezpečnosti sa vykonáva čisto experimentálne. Pozornosť je zameraná na nesúosovosť klzných plôch kapsy a bežca a ich vplyv na výkon ložísk. Okrem toho je skúmaná schopnosť samo-vyrovnávania podložky s použitím poddajnej podstavy. Experimentálna časť bola vykonaná pomocou testovania hydrostatického ložiska pozostávajúceho z dvoch káps s plnou diagnostikou. Ako ukazujú výsledky, navrhovaná metodika optimalizácie geometrických parametrov hydrostatického ložiska môže zlepšiť výkon ložiska až o 20 %. Skúmanie vplyvov nesúosovosti na výkonnosť ložiska ukazuje určitý rozsah, v rámci ktorého môže ložisko stále bezpečne fungovať, zatiaľ čo poddajná podpora môže tento rozsah ešte predĺžiť. Táto štúdia predstavuje originálny výskum rozširujúci poznatky o rozsiahlych hydrostatických ložiskových systémoch smerom k lepšiemu výkonu a vyššej bezpečnosti.
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Common defence policy in the contex of the EU law
Syruček, Václav ; Říha, Michal (advisor) ; Svoboda, Pavel (referee)
178 Common defence policy in the context of EU law Abstract: This thesis deals with the common defence policy in the context of EU law. The common defence policy is an undefined area of the EU's common defence and security policy. The first part of the work is devoted to the necessary theory of security policy, the theoretical concept of grand strategy, deterrence strategy and a brief history of the security integration of Europe, up to the establishment of the European Union and the increasingly extensive legal regulation of the area of common security and defence policy. Special emphasis is placed on the presentation of less well-known concepts in the Czech Republic, such as the theory of grand strategy, the theoretical approach to the formation of an ends-ways-means strategy and peace research. Peace is seen in the work as an ideal state, which itself, however, needs wider theoretical research. An understanding of peace theory is important for understanding the steps the European Union must take towards potential allies and systemic adversaries in order to ensure the security of its sovereignty, democracy and the lives, health and property of its citizens and residents. Positive peace is built using soft power and international cooperation. Negative peace is maintained through hard power and a strategy...
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Design of linear clock
Firla, Marek ; Malý, Martin (referee) ; Svoboda, Petr (advisor)
The main goal of this thesis is to describe the design, construction, and manufacture of linear clocks. The first part describes the current linear clocks design. The second part describes the design of a linear clock prototype. The linear clock is controlled by an Arduino UNO microcontroller unit, the time is measured by the real-time module, the movement of the time indicators is mediated by a pair of stepper motors. Manufacture is done using 3D printing.
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Recognizing Faces within Image
Svoboda, Pavel ; Žák, Pavel (referee) ; Švub, Miroslav (advisor)
The essence of face recognition within the image is generally computer vision, which provides methods and algorithms for the implementation. Some of them are described just in this work. Whole process is split in to three main phases. These are detection, aligning of detected faces and finally its recognition. Algorithms which are used to applied in given issue and which are still in progress from todays view are mentioned in every phase. Implementation is build up on three main algorithms, AdaBoost to obtain the classifier for detection, method of aligning face by principal features and method of Eigenfaces for recognizing. There are theoretically described except already mentioned algorithms neural networks for detection, ASM - Active Shape Models algorithm for aligning and AAM - Active Appearance Model for recognition. In the end there are tables of data retrieved by implemented system, which evaluated the main implementation.
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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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Design of impact microviscometer
Nepovím, Radovan ; Svoboda, Petr (referee) ; Hartl, Martin (advisor)
The bachelor thesis deals with engineering design of mechanical parts of impact microviscometer. Impact microviscometer is intended for educational tool for the study of rheological properties of lubricants in the laboratory in VUT Brno. The bachelor contains a brief summary has designed equipment and measuring methods used, restrictions of engineered apparatus, designs of constructional variation and description of constructional parts of the apparatus.
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Educational tasks for teaching of geometric tolerances
Hanáček, Lukáš ; Foltýnová, Dana (referee) ; Svoboda, Petr (advisor)
The bachelor’s thesis is divided into two main parts. The first one is a theoretical part and it clarifies the basics of geometric tolerancing. The second one is practical and it uses the knowledge gained from the first part to show how geometric tolerances are measured and evaluated. It is demonstrated on a part made especially for the thesis. The measurement uses a device available at the faculty. The purpose of this work is to educatively illustrate the measurement and evaluation of the specifications to students.
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Image Viewer for Windows Mobile
Miklósy, Jiří ; Kajan, Rudolf (referee) ; Svoboda, Pavel (advisor)
Over the past few years, sales of pocket pc have increased dramatically due to the devices' popularity. As a result, these devices have replaced desktop computers in an increasingly wireless world. In this bachelor's thesis, I will describe different technologies that can be used with these computers. In the following chapters, I will try to explain programming in DirectX. The aim is for the reader to be familiarized with this framework, its usage, and problem-solving techniques. In the last chapter, I propose and implement image viewer, image upload, and tagging in 3D.
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Project Documentation from Engineering Base
Domanský, Martin ; Svoboda, Pavel (referee) ; Rozman, Jaroslav (advisor)
This bachelor thesis deals with creation of documentation for electro-technical projects based on the Engineering Base tool. It cintains the new access how to obtain data from the Engineering Base database and describes how it is used. The practical aim was to develop an application that should serve as the basis for the commercial use of this functionality. The application was implemented using the .NET Framework and EB API for Engineering Base version 6.5.2. The work also describes testing of the basic application, while the outcome of the testing provides suggestions for possible extensions. These suggestions can be used for further development and solving various restrictions.
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Experimental Study of Lubrication Films Formation During Start-up and Reversal Motion of Rubing Surfaces
Svoboda, Petr ; Dzimko, Marián (referee) ; Čermák, Jan (referee) ; Dobeš, Petr (referee) ; Křupka, Ivan (advisor)
This dissertation is focused on the effects of both artificially produced and real roughness features on mixed lubrication film formation during start-up and reversal of non-conformal contacts operated under rolling/sliding conditions. The start-up operation of mixed lubricated contacts represents one of the transient conditions that bring the risk of the surface damage because of asperities interactions. Chromatic interferograms captured by CMOS high-speed camera during start up of the motion enabled to observe the detailed changes in lubrication film caused by surface features. The observation of the effects of surface dents artificially produced on the ball surface helped to understand better the behaviour of real surface topography. It was found that the presence of shallow surface features can help to separate mixed lubricated rubbing surfaces more efficiently than it could be suggested from the results obtained with smooth surfaces. It can be suggested from the obtain results that properly designed topography of the rubbing surfaces can help to reduce the asperities interactions under transient operational conditions.
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