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Vibrodiagnostics of electrical machines
Boháček, Daniel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This thesis deals with methods of vibration analysis in electric rotating machines. From the beginning, it is necessary to explain the basic concepts and introduce the issue of vibration. Next time, the work is focused on sources of vibration in electrical machines. Defects on electric rotating machines causing vibrations are described. Sensing is performed using sensors of deflection, speed and acceleration. The measured signal needs to be adjusted and filters, approximations and sampling will cover this in the next chapter. The main objective is the methods of analysis, which include the best known in the field of frequency analysis (FFT) and the envelope method in the time domain. This includes other methods such as Kurtosis factor, Crest factor, etc. There is also a basic block diagram for measuring vibrations. This block diagram is programmed and has a graphical user interface. The last part is an evaluation of the measured data of the engines.
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ECG monitor in LabVIEW
Pavlišta, Libor ; Kolář, Radim (referee) ; Harabiš, Vratislav (advisor)
The main purpose of this work is to get know about ECG signal, its genesis and relationship between mechanical and electrical part of the heart. Furthermore about the detailed disassembly of parts, for example of QRS complex, the determination of faulty statuses, the calculation of heartbeat frequence. We will take a look into the patient's monitors. We will get know about the measuring of ECG signal and how to treat the input signal to eliminate the undesirable components of signal, for example unwanted network noise - so-called network brum. We will study the concept of simple monitoring system with th draft of necessary filter in LabView program. We will construct alarms for some cardiac abnormalities, such as premature heart contractions. We will calculate heart rate. We will retrieve of data from an external source and we will prepare the appropriate graphical user interface.
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Digital controlled dc current source
Miškařík, Vít ; Mišurec, Jiří (referee) ; Vrba, Kamil (advisor)
This bachelor thesis aims to get acquainted with the issue of numerically controlled current sources, individual parts of them, their design options and comparison of the properties of these design options. In this thesis the individual parts needed to construct a numerically controlled DC current sources are analyzed and described, there are their main design relationships and possible achieved accurancy too. In next part there are described selected design options and calculation values of circuit elements. In conclusion there is presented the final schematic of whole source, result of computer function si- mulation, PCB design and measured parameters of really built circuit of numerically controlled current source.
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Demonstrational programs for music record processing
Jonáš, Petr ; Rajmic, Pavel (referee) ; Číž, Radim (advisor)
This bachelor’s thesis describes the processing of music records and signals. Demonstration programs were created in Matlab. In this thesis were created function of equalization, transposition and sound effects. In this thesis was created application for determining the similarity of signals. For both programs was created graphic user interface.
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Inteligent Video-Player
Sabela, David ; Materna, Zdeněk (referee) ; Kapinus, Michal (advisor)
The aim of this bachelor thesis was to create a user interface for displaying interesting or indifferent way significant events from the views of surveillance camera systems. In the first part of the thesis - Theory - technologies useful for the creation of a web application working with video are described. Principles of graphical quality in user interferences are also summarized in this part, as well as explanation of the principal questions of the surveillance camera systems problematics. In the second and third part - Design and Implementation - my own solution of the prototype of inteligent video player is depicted. The resulting prototype is thereafter subjected to examination by several testers whose results are analysedand evaluated in the final part - Testing.
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Online Image Editor
Vodák, Jakub ; Přibyl, Bronislav (referee) ; Svoboda, Pavel (advisor)
The purpose of this thesis is create application for online editation of static image. The main objective is user-friendly interface and simplicity. Basic graphic operations are available. The application allows you to create user accounts and the related ability to manipulate and share images. It is based on Adobe Flash and programming language ActionScript 3.0.
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Musical Signal Synthesis on Android
Mikulík, Jan ; Glembek, Ondřej (referee) ; Černocký, Jan (advisor)
The main task of this thesis is to design and implement new synthesizer on mobile platform under Android. The synthesizer generates three types of signals - sine, sawtooth and square. Two types of filters can be applied, low pass and high pass, and their cut-off frequency can be controlled. For the sound interpretation, an AudioTrack API was used. The synthesizer is controlled by zones, where one zone equals one tone. Zones can be selected by the user. For this synthesizer, a simple user interface was created.
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A Contribution to Optimal Synthesis of Filters
Szabó, Zoltán ; Hájek, Karel (referee) ; Král, Bohumil (referee) ; Sedláček, Jiří (advisor)
The presented dissertation thesis is focused on the optimization of filtering circuit synthesis. In the five main sections of this work, the author analyzes partial problems related to several areas within the synthesis of modern filtering circuits. The first chapter constitutes an examination of elementary aspects which characterize present-day integrated circuits in voltage feedback operational amplifiers, and this main content is further complemented with a view on possible application of these circuits for the designing of filtering circuits as proposed within subsequent parts of the thesis. In this context, the second chapter contains a description of the design and optimization of digitally controlled universal filters tunable by means of digital potentiometers originally produced for audio technology. These digitally controlled circuits are increasingly utilized as analog preprocessing blocks in digital signal processing systems. The most extensive portion of the dissertation is dedicated to a complex analysis of individual configurations of economical, purposely lossy active function blocks and modern voltage operational amplifiers. This part of the thesis aims at providing a detailed insight into the characteristics of individual configurations of examined circuits; furthermore, in this respect, the author proposes a comparison of various application possibilities relating to these circuits and their wider use in the field of active frequency filters optimization. The described section of the work also includes a definition and examples of application of the designed and realized program, which facilitates significant simplification of purposely lossy ARC filters. In the penultimate part of the dissertation thesis, the design, development, and verification of a suitable synthesis procedure are presented together with the optimization of data and (in particular) power models of EMC filters. Based on the verification of characteristics inherent with the designed models of EMC filters, the suggested measuring procedure related to these filters is described, including the design of a station for measuring elementary parameters of line anti-interference devices up to very high frequencies. In the last section of the thesis, the author discusses the procedure of air ions concentration measurement through an aspiration condenser and analyzes the systematic and random errors as well as the optimization of filtration characteristics of the applied measurement method. This part includes the description of the design and characteristics of the realized fully automated measurement system with an aspiration condenser.
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HF band power amplifier
Korvas, Miroslav ; Zamazal, Michal (referee) ; Šrámek, Petr (advisor)
The theme of my diploma thesis is a realization of the high frequency amplifier with possibility to change its class between class A, B and C with output low pass and band pass filters. The output power is supposed to be at about 10 W in frequency range 3,5 MHz to 14 MHz. The thesis contains theory of amplifier respectively transceiver and filters. In next parts I will design, simulate, realize and measure created amplifier and filters.
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