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High speed drilling of aluminium plates
Pilný, Lukáš ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
Optimalizace procesu vrtání kovových materiálů vyžaduje minimální tvorbu otřepů a jednotný vzhled vrtaných děr. Cílem práce bylo pochopit roli různých klíčových faktorů, jako řezných podmínek, způsobu upnutí obrobku a geometrie vrtáku, na tvorbu otřepů při vrtání 2 mm plechů tvářené hliníkové slitiny Al99.7Mg0.5Cu-H24, za použití vrtáků o průměru 1,6 a 2 mm, pro dosažení minimalizace tvorby otřepů a zajištění jednotnosti získaných povrchů pro velký počet vrtaných děr v obrobku. Tohoto cíle bylo dosaženo provedením 3 experimentálních testů. První experimentální test byl proveden za účelem sledování vlivu řezné rychlosti a posuvu za otáčku, jakožto rozpoznaných řezných parametrů nejvýznamněji ovlivňujících tvorbu otřepů, na výsledné velikosti vzniklých otřepů a jednotnosti vrtaných děr. V druhém experimentu byl zkonstruován vakuový upínací přípravek, za účelem upnutí vrtaného hliníkového plechu a omezení prostoru pro tvorbu otřepů na výstupní straně vrtání na obrobku, a jeho vlivu na tvorbu otřepů bylo vyhodnoceno. V třetím testu byl vyhodnocen efekt rozdílných geometrií vrtáků na tvorbu otřepů, spolu s dosaženou jednotností vrtaných děr. Výsledky z prvního experimentu prokázaly, že výška a tloušťka otřepů je redukována na obou stranách vrtaného plechu za použití vyšších řezných rychlostí. Při použití vyšších posuvů byla viděna zvětšující se výška a tloušťka otřepů na obou stranách vrtání, s výjimkou výšky otřepů na vstupní straně vrtáku do obrobku, která byla minimálně snížena. Druhý experiment prokázal, že vhodně konstruovaný vakuový upínací přípravek může významně omezit vznik otřepů na výstupní straně vrtáku z obrobku. V třetím experimentu, za použití 3 břitého vrtáku a vhodně konstruovaného vakuového upínací ho přípravku, bylo dosaženo eliminace tvorby otřepů z obou stran vrtaného plechu, společně s naplněním požadavků na jednotný vzhled vrtaných děr a vysoké výrobní produktivity. Takovýto optimalizovaný proces, bez nutnosti použití přídavné operace na odstranění vzniklých otřepů, poskytuje významnou redukci výrobních nákladů. Mimoto jsou poskytnuta doporučení pro další výzkum k dosažení zlepšení ve výrobě.
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Non-isothermal flow in relative frame of reference
Koblížek, Martin ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
The aim of this graduation thesis is to investigate whether it is possible to design a fluid machine that would utilize a flow resulting from different densities of processing medium, to generate electricity. The thesis focuses on the determination of relations that have influence on the efficiency. The parametres influencing the degree of efficiency have been analyzed. The aim is to reach the highest possible degree of efficiency. Depending on the results, a suitable processing medium can be selected. Within the scope of the thesis, an experiment had been proposed that verified the ground principle of the non-isothermal flow occurence. In conclusion, the outcomes are evaluated with the view of a prospective further developement of the device.
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Sustainability projects in Regional operational programme NUTS II Northeast
Dörnerová, Romana ; Tomšík, Karel (advisor) ; Pavel, Pavel (referee)
The diploma thesis deals with the issues of sustainability of projects financed
by the Northeast Regional Operational Programme NUTS II (ROP Northeast). The aim
of the thesis is to establish whether the recipients of subsidies of this programme face problems connected with provision of this projects sustainability. The subsequent interim goal, as long as such problems exist, is to propose specific measures that would reduce
their incidence.
The theoretical part of the thesis deals with the evolution of regional policies
in the European area and in the Czech Republic and puts the ROP Northeast into context
of these policies and of their application tools.
The practical part deals with ROP Northeast, its basic documents, institutional provision, focus and the aims of the programme including the allocation level designated for individual priority axes. Further it pursues the project cycle phases with a detailed analysis of the project sustainability phase and of the data about ROP Northeast implementation. This part is followed by inquiry made with the employees of the territorial inspection department of The Regional Council and with the recipients of the subsidies from the ROP Northeast, processing and analysis of acquired data and a proposal
of specific measures resulting from the conclusions of the inquiry with the recipients.
Thus the thesis gains its crucial importance, i.e. a possibility of an actual application
of the gained knowledge in practice.
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Determination of Motion Parameters in Machine Vision
Dušek, Stanislav ; Horák, Karel (referee) ; Janáková, Ilona (advisor)
This thesis describe about determination of camera motion parameters in plane. At first there are introduce the basics of motion tracking, is focused to find out displacement between two input images. Below is describe the algorithm GoodFeatruresToTrack, which find out the most significant point in a first image. The point is search out the good point, which will be easy to track in next image, reduce the data volume and prepare the input information (array of significant point) for the algorithm Lucas-Kanade optical flow. In second part is deal with processing and utilization estimations optical flow. There is median filtration, below is describe computation of homogenous transformation, which describe all affine transformation in affine space. As the result are coordinates, which describe the shift between the two input images as X-axis and Y-axis value. The project used the library Open Computer Vision.
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Intelligent monitoring device
Nosek, Zdeněk ; Šteffan, Pavel (referee) ; Kadlec, Jaroslav (advisor)
This master thesis discusses design and realization of a security device for vehicles. This device can determine its actual location, discover unauthorized trespass and send information about this to a distant master system too. This distant master system can show the exact position of the security device on a map. The hardware and software for this security device and the software for the master system are described in this paper.
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The impact of polarization mode dispersion on error-rate of optical fibre link
Dorociak, Petr ; Křivánek, Vítězslav (referee) ; Kyselák, Martin (advisor)
Master’s thesis engages in the impact of polarization mode dispersion on optical communication system. Polarization mode dispersion is mathematically described by Stoke’s and Jone’s space and ensure the theoretic causes of the rise of polarization mode dispersion that are divided on the external and internal effects. On the basis of these effects grow up a differential group delay (DGD) which makes causes that individual polarization modes have between them a time delay and limitation of maximum bit rate. Then master´s thesis analyses the influence of the polarization mode dispersion on the pulse enlargement and on the modulation signal. In this work, there are described the most applicated optical modulation formats. Polarization mode dispersion has also influence on the bit error rate of optical fibre link and closing of eye diagram too. Eye diagram is used to view the transmission characteristics and diagnoses the channel errors. Eye diagram is connected with the definitions as a bit error rate (BER) and signal-to-noise ratio (SNR) that are explained in this work too. Following the gained experiences it was designed an useful graphic interface to display the effect of the polarization mode dispersion on the transmitted signal. Realization of the graphic interface is created in the program MATLAB. In Matlab-Simulink are created six models according to the kind of modulations with characteristic AWGN (Additive White Gaussian Noise) channel. Program was tested for a typical values. In all calculations it is counted only with the losses that are caused by the polarization mode dispersion. It is not calculated with the losses that are caused by a chromatic dispersion and attenuation. At the end of this work are evaluated all types of modulation formats depending on the polarization mode dispersion, optical fibre length, price and complexity of the realization. Atteined results of my master’s thesis are compared with two foreign articles.
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The aktivity of municipal volunteer fire company with a view to decontamination
MALÍK, Daniel
In this thesis the procedures and methods of simplified decontamination carried out by fire brigade voluntary troops of a municipality with the help of available technique and acquired knowledge are elaborated. At present state the system and categories of fire protection troops, the plan of area coverage and the determination of selected fire protection troops to decontamination are described. The next part is devoted to decontamination itself. This term, the description and division of intervention place into zones, further the description of decontamination station and its space are analysed. Decontamination carried out by emergency facilities is used as the base for the created methodology. At the end of this part the decontamination of individuals and the technique is mentioned. In the questionnaire research the state of knowledge and equipment of fire brigade voluntary troops concerning decontamination is found out. On the basis of these facts the methodological list Simplified Decontamination in Fire Brigade Voluntary Troops of a Municipality was created. It will serve as a tool for professional preparation and education of their members, especially determined fire protection troops for decontamination.
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Optimization of the TV ad planning using mathematical models
Petruška, Tomáš ; Jablonský, Josef (advisor) ; Kalčevová, Jana (referee)
Planning and optimization of TV advertising space in the area of the Czech media market requires a knowledge of features of the problem and systems that are able to suggest the best results from data taken from measurement of TV audience, which is complex and demands special capacity. These results should be obtained (calculated) by using mathematical optimization models. Results depend on the objectives of company. The content of this thesis is to create and implement mathematical models, which serve to solve practical problems about planning advertising space and commercial blocks. The work deals with the characteristics of the television media market, audience measurement, the factors that influence the ratings, as well as an examination of other indicators that are necessary for the planning and optimization of TV advertising. Besides familiarizing the reader with the operations of buying advertising space, this paper`s goal is to demonstrate newly created mathematical models that are applicable to the work of TV channels, media agencies or other companies, which deal with the optimization of the television media market.
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2-D external aerodynamics of an unusual shaped body
Mohyla, Daniel ; Gal, Pavel (referee) ; Dohnal, Miloslav (advisor)
This bachelor thesis is focused on analysis of flow over a cylindrical rod in 2-D space by using computational fluid dynamics (CFD) with turbulence models k- SST and k- SSTSAS. First part of this thesis is meant to be an introduction to the topic of extrernal flow and CFD. In this part the topics of flow separation, turblence modeling and various related models are discussed. Second part deals with the description of simulation case inside of open source CFD software called OpenFOAM and the obtained results. In last part the disccusion about results is carried out and results are compared.
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Geolocation of Internet nodes based on communication latency
Horák, Michael ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This thesis covers the topic of determination of geographical location of a host in internet network while utilizing measurement of the end to end delay and implementation of Constraint-Based Geolocation. Gradually I go through issue of the delay in computer networks and ways how to measure it. Next chapter describes a few ways to geolocate host in internet network with emphasis on the CBG method. Another chapter is dedicated to describing a way to project spherical coordinates to the two dimensional space, which has been used in implementation of geolocation method. Chapter about implementation builds upon the facts given in previous chapters while functions of the program written in the JAVA programing language are being explained. Two similar geolocation methods were implemented. By comparing the results gained by implementation, new method of geolocation is proposed and devised. It combines properities of both previous methods. There are results of the implemented methods and their comparation to the one of the source documents used in creation of this thesis in summary section.
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