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Cavitation assessment from flow rate drop and high-frequency pressure pulsations.
Šebek, Miloš ; Hudec, Martin (referee) ; Habán, Vladimír (advisor)
Main issue of this master´s thesis deals with high-frequency pulsations caused by cavitating hydraulic components (in this case nozzle and throttle valve). In first measurement on the nozzle was not a high-frequency sensor set in the way, so the evaluation was incorrect. After re-setting of the way was the nozzle measured again and the pulsations were evaluated correct this time. During the last measurement was the sensor located behind the throttle valve, which was with gradual opening and cavitation treatment measured. Resulting dependencies worked out on time dependence. A special mathematical method, Fourier transformation, was used. It transformed pressure amplitudes into frequency dependence. Evaluation of dependecies is the basic step for frequency band assesment, in which the cavitation on particular components happens.
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Data reconciliation and gross error detection
Nováček, Adam ; Šomplák, Radovan (referee) ; Touš, Michal (advisor)
Operational data are used for control and optimization of a process in industrial and energy plants are used. Data provided from measurement are affected by errors arising from uncertainty of measurement (imprecision of measuring instruments). Data reconciliation provides us more precise variables which give us the opportunity to better optimize and achieve higher economic gains. The objective of this bachelor's thesis was to study the issue of data reconciliation of measurement and gross error detection in measurement variables. This work is divided into two parts. The first part is theoretical, describing measurement errors, solution methods for data reconciliation and statistical tests for gross error detection. The second part is a practical demonstration of data reconciliation on two examples. The results of reconciliation and the solution procedure are included. Complete procedure can be found in the Annex.
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New Approaches to Section Evaluation of Track Quality
Joudal, Daniel ; Volejník, Miloslav (referee) ; Plášek, Otto (advisor)
This diploma thesis addresses track geometry parameters quality assessment. It specifically studies a new assessment method intended to be used by the track manager. The theoretical background consists of description of measuring means used on the railway network in the Czech Republic and other methods of track quality assessment used around the world. The practical part lists the advantages and disadvantages of the new method. There’s also a comparison of this new method with the method currently used method CZK and an analysis of the quality index evolution.
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Identification of pauses in noisy speech signal
Kepák, Petr ; Míča, Ivan (referee) ; Smékal, Zdeněk (advisor)
The basic problem of speech is a complete separation of the natural noise which arise from correct articulation of voiced and unvoiced consonants from noise and disturbance environment. Objective of this master’s thesis is to find an effective method that could identify the pauses without speech activity, which can identify the properties of noise and disturbance. Once the noise is correctly identified, it is already possible to use different methods for its removal. The master’s thesis describes two methods of pauses identification. These methods are programmed in Matlab and tested on nine speech recordings. Methods analysis of the results was performed using the ROC (Receiver Operating Characteristic) curves. In the end are summarized results analysis of created methods.
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Performance comparison of methods for design of experiments for analysis of tasks involving random variables
Martinásková, Magdalena ; Novák, Drahomír (referee) ; Vořechovský, Miroslav (advisor)
The thesis presents methods and criteria for creation and optimization of design of computer experiments. Using the core of a program Freet the optimized designs were created by combination of these methods and criteria. Then, the suitability of the designs for statistical analysis of the tasks vith input random variables was assessed by comparison of the obtained results of six selected functions and the exact (analytically obtained) solutions. Basic theory, definitions of the evaluated functions, description of the setting of optimization and the discussion of the obtained results, including recommendations related to identified weaknesses of certain designs, are presented. The thesis also contains a description of an application that was created to display the results.
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Suppression of power-line interference in ECG signals
Gregorová, Kateřina ; Vítek, Martin (referee) ; Kozumplík, Jiří (advisor)
This work includes an overview of the different methods of filtering of ECG signals that suppress the network interference. It focuses on the parameters that affect the quality of filtration for the three main groups of filters: FIR, IIR and adaptive filters. The main objective is to evaluate proposed methods in terms of the quality of filtration. This quality is rated an average output SNR, standard deviation and time filtering. The criteria of success is based on the filtration of the basic requirements on digital filters. Design of filter is realized in the Matlab programming environment.
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Fractal Analysis of Track Geometry
Nejezchlebová, Jitka ; Holcner, Petr (referee) ; Svoboda, Richard (advisor)
The master’s thesis deals with the fractal analysis of track geometry. The theoretical part is primarily focused on introducing the basics of fractal geometry. There is also concisely described the current methodology for evaluating track geometry. In the practical part is verified the accuracy of the methods for determining the fractal dimension of the curve. For different curves with the same standard deviation is calculated the fractal dimension to demonstrate the possible advantages of using this analysis. Further is researched the use of the fractal dimension for the analysis of track geometry data. All mathematical procedures are done using the MATLAB system.
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Competitive Balance of First and Second Football Leagues in Selected European Countries
Radimský, Marek ; Šíma, Jan (advisor) ; Opelík, Daniel (referee)
Title: Competitive balance in first and second football leagues in selected European countries. Objective: The aim of this work is to identify competitive balance in first and second football leagues in selected European countries and compare them with each other. Methods: This thesis calculates static competitive balance using the standard deviation of percentage winnings. Results: The results show that in most football leagues there is a gradual decline in competitive balance, especially in the first leagues. In the group of second leagues, there is smaller amount of competitions with decreasing competitive balance. Second competitions were also on average more balanced compared to the first leagues in all countries included in the research. Last but not least, the results also overly show that the first leagues from less developed countries in football such as the Czech Republic, Poland or Croatia are more balanced compared to the first leagues from richer and more developed countries in football such as England, Germany, Spain or Portugal. Key words: competitive balance, football leagues, static balance, football, standard deviation
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Competitive Balance the of selected football leagues in Europe, their development and comparison
Mráček, Václav ; Šíma, Jan (advisor) ; Procházka, Jan (referee)
Title: Competitive Balance of the selected football leagues in Europe, their development and comparison. Goals: Determining the competitive balance in the six top European football competitions. This is a Czech Gambrinus liga, Dutch Eredivisie, German Bundesliga, Austrian Bundesliga, Ukrainian Premier liha Hungarian OTP liga, compare to competition and an outline of the development trend. Methods: The standard deviation of percentage wins, correlation coefficient, the presentation of results based on percentages, graphs, trends. Results: All results are presented in the analytical part of the work, verify predetermined hypotheses and are an important source of comparison for each event and outline trends. Keywords: Competition, equilibrium, European football league, football league, static balance, dynamic balance, season, club, reform, UEFA, sport, decreased balance, standard deviation, correlation coefficient.
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Evaluation of competitive balance in top European football leagues
Vichr, David ; Šíma, Jan (advisor) ; Novotný, Jiří (referee)
Title: Evaluation of competitive balance in top European football leagues Objectives The quality of objective of this bachelor thesis is the analysis of competitive balance of four European football leagues. Namely the Czech league, the Danish league, the Sweden league and the Norwegian league, their comparison and subsequent comparison with other European leagues. Methods: Static competitive balance calculated using the standard deviation of percentage wins. Results: The results show comparison of competitive balance in top European leagues and their development trends. As well as combine examined competitions into groups by similar development trends. Key words: Football, competition, static balance, standard deviation
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