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Hydraulic solution of the swirl turbine for locality of Rosenauer mill
Pavlíček, Tomáš ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This thesis focuses on the design of a swirl turbine for the site of Rosenauer Mill, where the gross hydraulic head HB is 1 m and the flow rate is Q is 1.6 m3/s. The beginning of the work is dedicated to microturbines and explains why a swirl turbine is suitable for this location. The procedure applied for developing the hydraulically active surfaces of the turbine is then presented. Firstly the design of the blades is based on analytical formulas, which are further refined using the CFX Ansys program. The turbine is closely affected by the inlet and draft tube, therefore their design is also included in this thesis. The hydraulic calculations yield the resulting parameters and characteristics of the designed turbine, calculated from the entire assembly using CFD computations. The final section of the work is devoted to the design of main structural components such as the gear, shaft, and bearings. The hydraulic design developed in this thesis serves as the basis for implementing the swirl turbine and constructing a small hydraulic power plant at the Rosenauer Mill.
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The design of Pelton turbine for given parameters
Pavlíček, Tomáš ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
The aim of this bachelor's thesis is to create a project of a small Pelton’s turbine for laboratory use, focusing on the design of nozzle and blade. Designing these two parts included beam measuring, calculating the losses in the piping and finding the working point of the pump. In its first part this thesis reviews the history, the operating principle and the main parts of the Pelton’s turbine. The next part includes finding the appropriate shape of nozzle and measuring the beam, followed by the calculation of lossy coefficient and efficiency of the nozzle from the measured values. The third part is dedicated to calculation of losses in the piping and finding the working point of the pump. In the last part, blade is designed.
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Speech signal processing in spectral domain
Pavlíček, Tomáš ; Šebesta, Vladimír (referee) ; Sigmund, Milan (advisor)
The thesis is focused on getting acquainted with methods of adapting speech signals in spectrum domain and with formants. Fist part is dealing with definition of formant, the relation between Czech language and formants, performing formant features and describing the use of formants in practice. This part includes preprocessing of signals before analysis on its own. This work contains a list of the most common methods for counting speech signals spectrum focused on estimation of spectrum by linear prediction. Practical part contains a verification of the most common methods for specifying formants, which are linear prediction coding and Fourier transformation. Next part is dealing with the description of methods used in created program. It also contains the description of functions of this program and the manual for it. In the end of this work the function of created program is verified and specified database is described.
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Segmentations for time-variable systems and their implementation
Pavlíček, Tomáš ; Smékal, Zdeněk (referee) ; Balík, Miroslav (advisor)
This thesis is interested in describing stationary random discrete signals, especially) in music discrete signals. Here is described when is signal stationary and when is not stationary. It contains tip for preprocessing of signal for accurate recognition of local stationarity. Thesis contain mathematical definition of parameters of random digital signals, which are used for stationarity recognition. It is followed by description of basic windows, their categories, describing of their parameters and comparing of each. In next part of thesis are described mothods of segmentations with constant window constant overlap save, constant window constant ovelap add, variable window constant overlap save, variable window constant ovelap add and variable window variable overlap add. It is followed by analyzing of windows used in segmentations with variable lengths of segments. As next point of thesis are transients made by step changes of coefficients of filter in filtering of segments with variable lengths. At the end is investigated the best accurate method of signal stationarity detection. Segments made by accurate method of detection are analyzed. thesis contains exapmle of music signal segmentation.
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Processing units of last generation processors and their utilization
Šlenker, Samuel ; Pavlíček, Tomáš (referee) ; Balík, Miroslav (advisor)
The aim of this thesis was to study and subsequently process the differences between the older instruction sets and newer instruction sets, to specify the benefits of the individual extensions, to compare the way of computations of the individual SIMD processing units and to compare the implementation of these processing units in Intel and AMD companies. Part of this work are two theoretical introductions to laboratory tasks.
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Slovene National Theatre in Ljubljana
Pavlíček, Tomáš ; Bajger, Oldřich (referee) ; Knesl, Jiří (advisor)
Slovene national theatre in the centre of Ljubljana as a part of existing city block. The composition of buildings creates new urban areas as a continuation of the urban axis of Josip Plečnik. The basic principle was to resolve the issues of entry into building, the definition and organization of space inner block, the creation and cultivation of new and existing urban areas. Unifying element of the whole composition is solution to the facade, which paraphrases the high order, typical for the surrounding buildings and significant not only for cultural buildings. As a contrast to massive and heavy mass of facade stand glass facade which makes lighter impression. White facade adds significance to the composition.
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Engineering optimization of a bolted joint under cyclic load
Pavlíček, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
This bachelor’s thesis deals with improving the service life of a cyclically stressed screw connection. In order to correctly determine the tension amplitude in the screw, it is necessary to know exactly the stiffness constant of the connection C. In this work, a comparison of analytical approaches for its calculation was made for a connection with a screw-in head screw. Based on a comparison with the numerical solution, it was evaluated as the most accurate approach according to the VDI 2230 standard. Furthermore, the influence of the size of the preload value on the life of the screw was assessed. It was found that the optimal value of the preload corresponds to the state when the clamping of the connected parts is lost. The last part of this work was focused on structural modifications that will improve the service life of the joint. The following design modifications were assessed: flexible screw, large area and spacer washer. The most significant increase in service life was achieved using a spacer washer.
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Hydraulic solution of the swirl turbine for locality of Rosenauer mill
Pavlíček, Tomáš ; Veselý, Jindřich (referee) ; Haluza, Miloslav (advisor)
This thesis focuses on the design of a swirl turbine for the site of Rosenauer Mill, where the gross hydraulic head HB is 1 m and the flow rate is Q is 1.6 m3/s. The beginning of the work is dedicated to microturbines and explains why a swirl turbine is suitable for this location. The procedure applied for developing the hydraulically active surfaces of the turbine is then presented. Firstly the design of the blades is based on analytical formulas, which are further refined using the CFX Ansys program. The turbine is closely affected by the inlet and draft tube, therefore their design is also included in this thesis. The hydraulic calculations yield the resulting parameters and characteristics of the designed turbine, calculated from the entire assembly using CFD computations. The final section of the work is devoted to the design of main structural components such as the gear, shaft, and bearings. The hydraulic design developed in this thesis serves as the basis for implementing the swirl turbine and constructing a small hydraulic power plant at the Rosenauer Mill.
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