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Using Salome Meca computing environment to solve problems of solid mechanics
Ptáček, Tomáš ; Vaculka, Miroslav (referee) ; Vosynek, Petr (advisor)
Given bachelors thesis deals with solutions of basic tasks of body mechanics with usage of the finite element method (FEM). An open-source software Salome Meca with Code_Aster solver is used there. Basic formulas of strength of materials on which is FEM based are introduces in the beginning. Then is presented software Salome Meca with its solver Code_Aster. Followed by own solution of tasks, which contain structural analysis and series of examples for solving the fracture mechanics. Numerical solutions from Salome Meca are compared with analytical solutions, if some exist, and with solutions from commercial software Ansys Workbench.
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Design of experimental device for visualization of axial forces in bolted connections
Ptáček, Tomáš ; Galas, Radovan (referee) ; Svoboda, Petr (advisor)
In the bachelor's thesis is created design experimental device that will be able to measure preload in bolted joints. The first part of thesis deals with research study of the current state of knowledge of bolted joints, depending on the use of different types of lubricants. According to informations, 3 different variants are introduced. The selected variant is described in detail with their advatnages and disadvantages. The final design is developed into technical drawing and electronic 3D models.
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Penetration of metal into green sand during pouring of iron castings
Ptáček, Tomáš ; Neudert, Alois (referee) ; Záděra, Antonín (advisor)
This diploma thesis deals with the creation of penetration of cast iron with graphite casting cast into bentonite molds. In the first part of the thesis is theoretically described the formation of penetration, its main causes, consequences and the elimination of this defect. The second part analyzes the causes of the defect with the Minitab statistical software and shows the possible connections of the input materials to the occurrence of the defect. Next, the experimental finding of the cause of the defect, which is focused on the measurement of the pressures in the form of the casting, is devoted to it.
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Multifunction centre in Opava
Ptáček, Tomáš ; Buchta, Stanislav (referee) ; Šmak, Milan (advisor)
Master´s thesis deal with the supporting steel structure of multi-storey multifunction center in Opava. The complex consists of three sub-objects of three and five storeys with a total floor plan dimensions 48 m × 82.27 m. Five-floor building is designed with ground plan dimensions 42 m × 30 m with the distance of the poles 6.0 m x 6.0 m. The median three-storey building is designed with ground plan measuring 42 meters x 22.27 meters to the distance of the poles 6m x 5m. Ultra three-storey building is designed with ground plan dimensions 42 m × 30 m with the distance of the poles 6m x 6m. Construction of the complex height is 5m.
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Object Detection in Images
Ptáček, Tomáš ; Šiler, Ondřej (referee) ; Švub, Miroslav (advisor)
This work deals with the problem of object detection in images and describes theoretical backgrounds of detection based on boosting, AdaBoost algorithm and Haar-like features as weak classifiers. Further this work engages in design and implementation of a training and detection application based on OpenCV and wxWidgets libraries. To the end it shows a training and face detection test performed in the implemented application.
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Peculiarities of the atmospheric precipitation regime in medium and high altitudes of the Czechia and Slovakia
Ptáček, Tomáš ; Sládek, Ivan (advisor) ; Sehnalová, Petra (referee)
Peculiarities of the atmospheric precipitation regime in medium and high altitudes of the Czechia and Slovakia Abstract The thesis deals with the question of rise in precipitation during winter period in mountain and submontane areas of the former Czechoslovakia. This increase comes out as circumstantial maximum of precipitation in winter period. Some stations have even recorded higher precipitation totals during colder half-years than during warmer half-years. The areas, which experience this phenomenon, differ in this matter from the continental nature of the precipitation in the lower altitudes. The main part of the thesis consists in a background research of the existing expert literature on the topic of increased incidence of winter precipitation, which hasn't been sufficiently discussed so far. The other substantial part of the thesis forms personal research. The research has been made at three stations in the Jizera mountains, i.e. in the area, where the increased incidence of winter precipitation comes out at most. There have been encountered some atmospheric situations triggering extreme precipitation totals in winter, which can't be found to such extent in lower altitudes. The windward of the Jizera mountains combined with the dominant west streaming during winter period is to be regarded as the...
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Errors and corrections of atmospheric precipitations measurements
Ptáček, Tomáš
The thesis approaches the problem of systematic errors that arise in measuring precipitation. These errors lead to underestimation of total rainfall. Size of losses can reach in our latitudes even tens of percent. The systematic errors that contribute most to the underestimation include losses caused by the rain gauge walls wetting, evaporation losses and losses due to aerodynamic effects on the rain gauge precipitation particles. A major section of the thesis is formed by background research, which deals with the issue of systematic measurement errors precipitation. The background research tackles the lack of literature on this topic in the Czech Republic. In the research section of the thesis, two existing correction methods for estimating the size of systematic errors for the Czechoslovak manual rain gauge Metra (method developed in the 80's by Slovak Hydrometeorological Institute and the method described by the dissertation thesis Radoslav Tihlárik) were applied to data of selected four stations in the Czech Republic (Milešovka, Bedřichov - Přehrada, Čáslav - Nové Město and Svratouch) . The first mentioned method was applied to all stations in the Slovak Republic in the nineties. Nevertheless, it has not been used in the Czech Republic so far. The results show that the Tihlárik method gives...
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Penetration of metal into green sand during pouring of iron castings
Ptáček, Tomáš ; Neudert, Alois (referee) ; Záděra, Antonín (advisor)
This diploma thesis deals with the creation of penetration of cast iron with graphite casting cast into bentonite molds. In the first part of the thesis is theoretically described the formation of penetration, its main causes, consequences and the elimination of this defect. The second part analyzes the causes of the defect with the Minitab statistical software and shows the possible connections of the input materials to the occurrence of the defect. Next, the experimental finding of the cause of the defect, which is focused on the measurement of the pressures in the form of the casting, is devoted to it.
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Using Salome Meca computing environment to solve problems of solid mechanics
Ptáček, Tomáš ; Vaculka, Miroslav (referee) ; Vosynek, Petr (advisor)
Given bachelors thesis deals with solutions of basic tasks of body mechanics with usage of the finite element method (FEM). An open-source software Salome Meca with Code_Aster solver is used there. Basic formulas of strength of materials on which is FEM based are introduces in the beginning. Then is presented software Salome Meca with its solver Code_Aster. Followed by own solution of tasks, which contain structural analysis and series of examples for solving the fracture mechanics. Numerical solutions from Salome Meca are compared with analytical solutions, if some exist, and with solutions from commercial software Ansys Workbench.
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|
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Errors and corrections of atmospheric precipitations measurements
Ptáček, Tomáš
The thesis approaches the problem of systematic errors that arise in measuring precipitation. These errors lead to underestimation of total rainfall. Size of losses can reach in our latitudes even tens of percent. The systematic errors that contribute most to the underestimation include losses caused by the rain gauge walls wetting, evaporation losses and losses due to aerodynamic effects on the rain gauge precipitation particles. A major section of the thesis is formed by background research, which deals with the issue of systematic measurement errors precipitation. The background research tackles the lack of literature on this topic in the Czech Republic. In the research section of the thesis, two existing correction methods for estimating the size of systematic errors for the Czechoslovak manual rain gauge Metra (method developed in the 80's by Slovak Hydrometeorological Institute and the method described by the dissertation thesis Radoslav Tihlárik) were applied to data of selected four stations in the Czech Republic (Milešovka, Bedřichov - Přehrada, Čáslav - Nové Město and Svratouch) . The first mentioned method was applied to all stations in the Slovak Republic in the nineties. Nevertheless, it has not been used in the Czech Republic so far. The results show that the Tihlárik method gives...
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