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Design of a hydraulic system for long-distance water transport
Dobrovolný, Martin ; Kozubková, Milada (referee) ; Veselý, Jindřich (referee) ; Pochylý, František (advisor)
The Ph.D. thesis aims to design a hydraulic system for long-distance water transport by the serial connection of axial pumps. Specifically, there is presented an analysis of the axial centrifugal pump prototype, which was tested. The prototype has a specific design. An asynchronous electric motor with a hollow-shaft rotor is used. The pump's impeller is pressed into the hollow shaft. Some advantages follow from the design compared to common pumps and pumping stations. For example, it is possible to designate a compact design of a pump and lower pressure load of pipe, so the elastic material for the pipe's wall can be used. However, the main disadvantage of this design is related to the large rotating diameter, where the pump's seals are located. It leads to quite large mechanical losses on seals and in the context of relatively small hydraulic power also to small efficiency. Therefore one part of the Ph.D. thesis is focused on the pump's seal. The result of the work is a new design of the mechanical face seal with a spiral grooves. The seal was manufactured and subjected to the test. During the testing of the prototype axial pump, it was also revealed inappropriate hydraulic design. Therefore it was necessary to redesign the impeller and guide vanes of the pump.
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Shaft seals and stuffing boxes of pumps
Pluskal, Tomáš ; Dobrovolný, Martin (referee) ; Štefan, David (advisor)
Pumps are an integral part of industry, agriculture, but also everyday life. One of the main elements that affect the proper function and reliability of these machines are shaft seals and gaskets. The first part of this work deals with individual types of shaft seals and gaskets, their design, application, function and used materials. In the second part, a suitable seal for the selected pump is dimensioned.
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The pump for the transport of fluids from great depths
Dobrovolný, Martin ; Haluza, Miloslav (referee) ; Pochylý, František (advisor)
In this Bachelor's thesis are included the basic information about dividing pumps. The division of the pumps is carried out according to standard ČSN 11 0000 and according to the specific speed of the pumps. There is a description of conventional designs of vertical hydrodynamic pumps and their use. The advantages and disadvantages of pumps used in boreholes are evaluated. The last chapter describes the construction of new hybrid pumping system. Also its advantages over existing pumps are described as well as its potential future use.
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Recognition of Handwritten Digits
Dobrovolný, Martin ; Mlích, Jozef (referee) ; Herout, Adam (advisor)
Recognition of handwritten digits is one of computer vision problematics that can not be solved with 100 % success these days. This document describes a method for handwritten digits recognizing based on shape features and randomized tree classifiers. These methods are known for their long time machine learning and quick characters recognizing. This method is due to use of relative angles among key locations and is nearly invariant to substantial affine and nonlinear deformations.
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The turbine regulation of the small hydro-powerplants
Horký, Jiljí ; Dobrovolný, Martin (referee) ; Stareček, Jakub (advisor)
This bachelor thesis deals with the regulation of water turbines in small-hydro power plants. The first chapter presents the basic theory of this issue. In the next following two chapters, the characteristics of individual types of turbines, their construction and construction of control mechanisms are introduced. With the help of velocity triangles is shown, how the flow conditions are changing during the work of control mechanisms and what influence the control has on the hydraulic machine.
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Design studies of axial sealing pumps
Dobrovolný, Martin ; Stareček, Jakub (referee) ; Pochylý, František (advisor)
Review of axial hydraulic machines and elementary procedures of design hydraulic machines are listed in the first part of thesis. Second part is dedicated axial pump with annular motor and measurement its characteristic curve. In the third part of thesis, procedure of design axial pump with tube motor is described, also there are listed CFD results and characteristic curve of axial pump with tube motor is predicted.
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Detection and Recognition of Matrix Code in Real Time
Dobrovolný, Martin ; Juránková, Markéta (referee) ; Herout, Adam (advisor)
This work is dealing with detecting and recongnizing matrix codes. It is experimenting use of PCLines algorithm. PCLines is using Hough transform and parallel coordinates for fast detection of lines. Suggested algorithm with double use PCLines detects sets of parallels and problem with image distorted by with parallel projection is solved by cross-ratio equation. We did some optimizations for realtime running and created experimental implementation. Test results shows, that use PCLines one way to detect matrix codes.
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Shaft seals and stuffing boxes of pumps
Pluskal, Tomáš ; Dobrovolný, Martin (referee) ; Štefan, David (advisor)
Pumps are an integral part of industry, agriculture, but also everyday life. One of the main elements that affect the proper function and reliability of these machines are shaft seals and gaskets. The first part of this work deals with individual types of shaft seals and gaskets, their design, application, function and used materials. In the second part, a suitable seal for the selected pump is dimensioned.
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