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Structure modeling of mechatronic systems with spot welds and their influence on the eigen frequency
Gajdík, Michal ; Hadaš, Zdeněk (referee) ; Vosynek, Petr (advisor)
This bachelor thesis examines various types of spot welds in Ansys Workbench 13. In first chapter of this thesis are described theoretical foundations of simulation modeling. In following phase are analyzed each methods of simulation modeling. Practical part is about realizing different types of spot welds and examining their impact on clamped boards. Outputs of this thesis are modal abilities of each executed type of spot weld. On attached CD are program annex and project in Ansys Workbench 13. The goal is to analyze differently modeled spot welds, displaying primal deflections and comparison of modal abilities.
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Automatic Generation of Steps for DDR
Skála, František ; Glembek, Ondřej (referee) ; Černocký, Jan (advisor)
The goal of this work is to draft methods suitable for automatic creation of step-files from music files for a DDR computer dance game. This problem is divided into two main parts - beat detection, thus determining the song tempo, and determination of steps itselves. Beat detection is based on detection of energy growths in particual frequency subbands and following statistical alignment of results. Step creation works similarly, but it focuses on detection of all intense moments of music and contains a logic for placing steps into different directions. Testing by users showed that application has the potential to address players seeking set of simple steps for their favourite songs. The quality of beat detection gives field for application of these methods even beyond scope of example application. This document also suggest a few possible improvements of used methods.
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SW for signal generation simulating rotary system faults
Martínek, Marek ; Marada, Tomáš (referee) ; Zuth, Daniel (advisor)
This diploma thesis deals with the design and creation of an algorithm for generating simulated signal data from a vibration diagnostics device. The first part is focused on theoretical acquaintance with vibration diagnostics and characteristics of individual defects of rotary machines. The next part deals with the possibilities of mathematical and kinematic simulations using a computer software. The main part of this work is dedicated to design and creation of software for generating simulated signal data. In the last part, the principle of simulation of specific defects of rotary machines is clearly demonstrated.
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Indirect vibration analysis using a mobile phone microphone
Plodková, Zuzana ; Huzlík, Rostislav (referee) ; Zuth, Daniel (advisor)
The bachelor thesis deals with the possibility of using a recorded signal from a mobile phone for vibration analysis. The first half of the thesis is a research generally dedicated to microphones, microphones in mobile phones and technical diagnostics. The chapter about microphones discusses the principle of their operation, further it analyzes the most important technical parameters and finally divides microphones according to their construction. In case of microphones in mobile phones there is mentioned the most commonly used type of microphone and its structure including a description of possible sound filtration. Possible ways and approaches to processing the measured signal are mention in the chapter abou technical diagnostics. The second part of the thesis is devoted to repeated measurement and subsequent processing of measured values. An evaluation of efficiency of the method of measuring the signal with a mobile phone for vibration analysis by comparison with the results obtained by a professional measuring technique follows.
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Sleep EEG analysis
Kříženecká, Tereza ; Potočňák, Tomáš (referee) ; Ronzhina, Marina (advisor)
This thesis deals with the analysis of EEG during various sleep stages, which is done by calculating the selected parameters from the time and frequency domain. These parameters are calculated from individual segments of EEG signals that correspond with various sleep stages. Based on the analysis it decides which EEG parameters are appropriate for the automatic detection of the phases and which method is more suitable for evaluation of data in hypnogram. The programme MATLAB was used for the analysis and also for the comparison of chosen data.
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Properties electrodes materials for alcaline accumulators
Řihák, Lukáš ; Vrbický, Jiří (referee) ; Sedlaříková, Marie (advisor)
This thesis is involved in basical properties of electrode materials for alkaline accumulators. This thesis describes the possibilities of capacity stabilisation of nickel electrode to be stable for highest number of cycles. Thesis also consider modification of properties of electrode materials on the base of nickel hydroxide by using dopes (aluminum, manganese). Measuration proceeded on the thin film electrodes created by electrodeposition. Measuration of properties of electrodes proceeded by cyclic voltammetry and frequency analyzis.
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NVH Analysis of the Powertrain
Mrózek, Jan ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This master thesis is focused on the diagnostics of vibrations and noise of an internal combustion engine. The work also includes a summary of the current state of knowledge in which the quantities used, transmission paths, measuring devices and the possibilities of performing frequency analysis are analysed. As part of the technical experiment on which this work is based, vibrations and noise on the tractor engine are measured. The obtained data are then further processed using the BK Connect program. Subsequently, a frequency analysis is performed, specifically an order analysis. The conclusion of the analysis consists of an evaluation of individual orders that cause excitation that occur in the investigated motor.
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Spectral analysis of sound in spatial acoustics
Křenek, Jakub ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis is focused on the basics concepts of room acoustics and used sound level meters. The first part focuses on the spatial acoustics and acoustic quantities used in it. Next part of thesis describe the structure and features of sound level meters. Following chapters are concerned on the PULSE system architecture and data analysis. PULSE platform contributes multi-spectral analyzer type 3560B PULSE, programming environment LabShop and microphones for difuse and free fields. The practical part describes the installation, setup and the measurement of reverberation time in the Labshop environment.
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The effect of sampling period error on frequency analysis
Pietrowicz, Daniel ; Marada, Tomáš (referee) ; Zuth, Daniel (advisor)
This thesis will be focused on signal measurement in connection with digitization and analysis inaccuracy of sampling peroid effect. Brief narration of frequency analysis and description of Matlab and his capabilities with this issue. Then creation procedure for simulation model of analog signal and his fault digitization via sampling period. Systematic comparation of this effect on inaccuracy of sampling period on frequency analysis.
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Transcutaneous electrogastrography
Davidová, Lenka ; Závodná, Eva (referee) ; Nováková, Zuzana (advisor)
The aim of this thesis is to introduce the physiology and pathophysiology of the gastrointestinal tract, with functional parameters and appropriate diagnostics. The thesis also deals with transcutaneous electrogastrography devices and presents a suggestion of a measurement protocol which would involve a group of volunteers in fasting and postprandial states. The theoretical part describes the function of the gastrointestinal tract, detailing the analysis of gastric myoelectric activity and gastric motility. It also outlines technical and formal aspects of the parameters, artefacts and subsequent data analysis. In the practical part, a program is designed and implemented in the Matlab computing environment for the analysis of EGG recordings. Furthermore, differences between parameters in fasting and postprandial states are evaluated.
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