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Analytical calculations of flange joints
Polišenská, Anna ; Chalupa, Aleš (referee) ; Hůlka, Jiří (advisor)
This Master’s thesis deals with flange joints. A suitably designed flange joint (FJ) construction and installation is necessary to ensure the reliability of piping systems and machinery where these joints are used. The thesis describes the procedures of their design and assessment in terms of tightness, strength and durability. It focuses on the stiffness calculation of all components of FJ – primarily the stiffness of flanges, bolts and seals. The main part of the work was to create a computational program by using the Python language to determine the appropriate preload force in the bolts. The program uses the procedures described in the ČSN EN 1591-1 standard. The thesis describes computational algorithms of this program, verification of the program and its use in the assessment of FJ on a specific technical work – pressure vessel with adjacent piping. Verification was performed by comparing the acting force to the seals obtained from the computational program and the stress-strain analysis using the finite element method (FEM), where the load model in this stress-strain analysis included the preload force obtained from the computational program. The application of the pressure vessel computational program consisted in determining the preload forces for all FJs of this assembly. The last part describes the assessment of the most loaded FJ. Again, stress-strain state was evaluated using FEM and FJ was assessed for tightness, strength and durability using the NTD A.S.I. standard.
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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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Design and optimization of soldering process of solder glasses
Vinklerová, Viktorie ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
The bachelor‘s thesis deals with solder glasses, its physical properties and types. The work also includes a discussion about heating methods, soldering equipment, soldering process and material compatibility of various metal alloys, metals and sealing materials. The aim of the work is to optimize the soldering process of the glass solder G018-266, which is compatible with Al2O3 and the subsequent realization of the ceramic casing. The work also describes the measurement of the strength of the formed joint in the shear.
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Hydraulic cylinder
Svárovský, Petr ; Jandourek, Pavel (referee) ; Klas, Roman (advisor)
This bachelor thesis deals with problems of linear hydraulic motors. In the introduction, the general distribution of hydraulic motors is given. The main part of the thesis is devoted to linear hydraulic motors, their parts and construction. The strength calculation of the hydrau-lic motor is also given. The conclusion of the thesis is devoted to the mathematical model for calculating the natural frequencies of the hydromotors.
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Tightness evaluation of gasketed tubesheet
Trubač, Daniel ; Pernica, Marek (referee) ; Létal, Tomáš (advisor)
This master thesis focuses on the issue of tightness evaluation of gasketed tubesheet in U tube exchangers, which meets strength requirements of ČSN EN 13 445-3 and ČSN EN 1591-1 standards. It deals with the forces acting on the gasket when measuring the effects acting on the entire heat exchanger. A separate part is devoted to the calculation of the heat profile in the heat exchanger and verification of the strength of the heat exchanger. The final part introduces model of a heat exchanger, on which a possible approach to solving the tightness of the tubesheet in heat exchangers is presented. In thesis temperature field evaluation was conducted, the results of which were used in stress strain analysis, in order to obtain gasket contact pressure. Extreme gasket contact pressures were used to estimate leak rate limits.
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Study on wear of material in contact with MR fluid
Žáček, Jiří ; Vimmr, Jan (referee) ; Kubík, Michal (advisor)
This paper is focused on MR dampers and its critical parts in term of damper`s durability, which seems to be a piston-rod seals, and it should find an ideal material combination of seal and MR fluid for increasing the damper`s life. The tests were conducted in modified pin-on-flat configuration, which was supposed to be more suitable for laboratory testing. There was tested and compared a suitable material for seals, like PTFE, NBR, SBR of polyurethanes. The article is also focused on MR fluids and its contribution to seal`s wear. The impact of particle concentration, wear of MR fluid and effect of modification of MR fluid was tested. It showed up, that the best material for seal is H-PU95FDA. The effect of particle concentration is negligible on seal`s wear, while effect of modification and wear of MR fluids are significantly higher.
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Worm conveyor
Sedláček, Martin ; Jonák, Martin (referee) ; Malášek, Jiří (advisor)
This bachelor thesis deals with calculation and construction of worm conveyor for slightly sloping transport. The whole work is divided into two main sections, which include structural and textual parts. The text contains analysis of option for single parts of conveyor, functional and strength calculations, which are necessary for proposal of worm conveyor. The structural part includes mechanical drawings, which consists of drawing of configuration and drawings of details for worm shaft.
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Evaluation of the flange joints calculations approaches
Jeník, Ivan ; Chlud, Michal (referee) ; Hůlka, Jiří (advisor)
This bachelor´s thesis deals with the design and assessment of flange joints with gasket. The first part defines term flange joint and its load. It surveys and assesses the possible alternatives of design solution. Mentioned is the issue of bolt connections with pretension, including force relations in the joint, determination rigidity of parts and their strength. In addition, analysis of the causes of bolts failures and their removal, methods of creating pretension. It gives an overview of the most widely used types of gaskets, their properties, application and definition of characteristic values of gaskets and their determination according to ČSN EN 13 555. Another section deals with the design process of flange joints, standards for the design, desired outputs and assesses analytical and numerical approach. Computational program was created in MS Excel 2007 for design calculation of flange joints according to ČSN EN 1591-1. Verification of the results was performed with calculation of identical models using finite element method (FEM) in ANSYS Workbench 14.0. Errors in standards formulas were submitted. In conclusion, the results obtained analytically and by FEM were assessed for a specific load conditions of gate valve DN 300. Camprofile (grooved) gasket with nonlinear material model was used.
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Design of Experimental One-cylinder Engine with Floating Liner
Svoboda, Radovan ; Svída, David (referee) ; Novotný, Pavel (advisor)
The aim of this master`s thesis was to design a single-cylinder test engine for measuring of the friction forces between the piston group and the cylinder liner. Main engine parameters are based on the common production engine. A floating liner device was chosen for a friction forces measurement. It was necessary to solve an attachment and sealing of the floating liner. Stress-strain analysis of the floating liner has been done. Next step was to re-design a production crankshaft also with a connected balancing devices for single-cylinder engine. Powertrain was seated in a completely new units. Finally the engine was completed and mounted on a stand.
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Indoor swimming pool - concrete tank construction
Pőthe, Péter ; Pulec, Vladimír (referee) ; Perla, Jan (advisor)
The aim of the diploma thesis was to design reinforced concrete construction of the indoor swimming pool and ensure impermeability of the construction, to ensure behavior as concrete tank construction. Static analysis was done by using program Dlubal RFEM 5.12, where interaction of subsoil with construction was taken into account. Slabs around the swimming pool area were divided into expansion section because of temperature changes from glass façade an after that the sealing of expansion gap was solved. Construction system under the swimming was designed and was tested the behavior of walls and slabs. Analysis was done also to considerate of hydration heat. The drawing was done by software CADKON RCD.
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