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Fully-differential frequency filters with nontraditional active elements
Dvořák, Jan ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
Bachelor's thesis deals with designs of fully-differential frequency filters which operate in current mode where it is possible to control their parameters by change the transconductance or the amplification. The first part divides and describes in general frequency filters. Furthermore, there are described active elements together with their simple simulation models. The second part describes the design of frequency filter by M-C signal-flow graph and methods of transforming final circuit to fully-differential structure. Next part presents several structures of the second-order filter with their simulations in non-differential and fully-differential forms. Last part presents designs of boards of printed circuits and measurement results of two chosen circuits.
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Vibration at milling of metal
Dvořák, Jan ; Štetina, Jakub (referee) ; Fiala, Zdeněk (advisor)
This thesis contains theoretical description of milling, mathematical description of oscillation and causes of self-excited vibrations during the milling process. It further contains dynamic measurement of machine-tools and stability lobe diagram. At last it states different ways of prevention, removal or maximum reduction of self-excited vibrations during the milling process.
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Proposal of the fractal order filtering structures
Uher, Jiří ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This thesis deals with the fractional (1+)-order filters. The proposed filters operate in the current-mode. The derivation of the filters has been achieved using a third-order aproximation of the coresponding fractional-order transfer functions. It also describes active elements such as universal current conveyor, current follower and operational transconductance amplifier. In the end of this thesis some new circuit solutions of the fractional-order filter are proposed. Then the proposed filters are realized and experimentally measured.
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Fractional-order filter structures
Lefler, Filip ; Langhammer, Lukáš (referee) ; Dvořák, Jan (advisor)
Semestral thesis deals with fractional-order frequency filters. There is descripe proposal of the filter, their simulations and practical realizations. The first part is focused at the introduction to a frequency filters. The following is chapter which explore various proposals fractional-order frequency filters. The next chapter describes used activ elements in this thesis. Then there is briefly described a method of the signal flow graphs. The following is a description of the theoretical design of lowpass and highpass frequency filter, where order of the filter is between the first and second. Another part deal with the design and simulation of the four circuits. There are two curcuits consists of transconductance amplifiers (BOTA) and two curcuist consists of current followers. The last part of the thesis deals with practical realization of the two fractional-order filters.
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Inertial Navigation Unit
Dvořák, Jan ; Hubík,, Vladimír (referee) ; Šebesta, Jiří (advisor)
This thesis is focused on the design and realisation of inertial navigation unit INS. The unit is capable to measure, store and send data to a PC in real-time for a later offline processing. The first part of the thesis introduces the reader with the basic principles of accelerometers, gyroscopes and MEMS sensors. An introduction to coordinate systems and measuring errors is also included. The second and third part of the thesis deals with the analysis of the solution and the implementation of the INS unit. The fourth part of the document is dedicated to the software for the INS unit. This thesis concludes with explanation how the gathered data are processed.
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Simple PDA IS for Phone Call Registration
Dvořák, Jan ; Ráb, Jaroslav (referee) ; Ščuglík, František (advisor)
This bachelor thesis is about programming aplications for PDA devices, primary on the Microsoft platforms. Next it deals with wireless technology Bluetooth and its use in the PDA devices and mobile phones. This project includes information system where mobile phone calls, which were loaded to PDA by Bluetooth, are processed.
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Domain Indices in Oracle 11g
Dvořák, Jan ; Ráb, Jaroslav (referee) ; Zendulka, Jaroslav (advisor)
This thesis deals with the domain indexes in Oracle Database 11g. It describes the database architecture and discusses the available methods of indexing. There are explained concrete ways of the implementation and use of domain indexes, also discussed ways of indexing spatio-temporal data especially the TB-tree structure, which is then implemented as a domain index. Along with the domain index operators are also implemented by means of which the index is subsequently used and tested.
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Anlysis of the Effect of Insulation on the Price of Flats in Žďár nad Sázavou
Dvořák, Jan ; Hlavinková, Vítězslava (referee) ; Kubičková, Veronika (advisor)
This thesis analyzes the impact of insulation on the price of flats in Zdar. In the theoretical part of the thesis deals with the theme of energy demand and pricing. The second part sets the prices of selected flats in different valuation methods, namely: direct comparison method, comparative method and cost method. Furthermore, the work deals with energy conservation, depending on the thermal insulation. The aim is to determine whether and by how much prices will rise flats due to the additional insulation, what are the savings in heat and what about payback to investment.
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Production of carrying body by solid forming
Dvořák, Jan ; Streid, Jan (referee) ; Kopřiva, Miloslav (advisor)
This diploma thesis has been elaborated within the Master's study that submits a production proposal of carrying body by solid forming. The forging has been performed using drop orging method at the crank forging press LZK 1000. Heating is inductive and flash trimming has been peformed in the trimming press LKOA 200. The used material of the forging is steel CSN 14 220. Production series is 100 000 pieces. A part of this thesis is calkulations, geometric design and economical evaluation.
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