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Production of pulley for micro-belts at SPN 12CNC/Sinumerik 810D
Juránek, Martin ; Dvořák, Jaromír (referee) ; Píška, Miroslav (advisor)
As the tittle itself suggests, this thesis deals with the production of two two poly-V pulleys on the lathe SPN 12 CNC. In the first chapter, the thesis mentions transmissions and its types. Furthermore, the main advantages of poly-V pulleys compared to classic V-pulleys are outlined here. There is also geometry and calculation relationships of power ratios in a simple belt transmission. The practical part suggests several methods of creating a possible CNC program for the production of the grooves themselves. The practical part suggests several methods of creating a possible CNC program for the production of the grooves themselves. Among the possible methods, the contour creation method using incremental programming is used, and 6 grooves are created using the FOR counting loop. The work is also supplemented about the methodology for measuring the functional dimensions of the grooves, and there is also the measurement of the parameters of the insert with which the grooves were made.
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Modification of a multi-recess hydrostatic bearing pad geometry
Šimara, Vít ; Robenek, Dětřich (referee) ; Svoboda, Petr (advisor)
In the design of a hydrostatic bearing, basic analytical expressions assuming parallelism of sliding surfaces and simple geometry can be employed. In this study, the properties of a specific pocket shape were investigated even under conditions of tilt, which can arise from assembly errors or asymmetric loading. Based on experimental data, a Computational Fluid Dynamics (CFD) model of hydrostatic lubrication has been developed and validated. A constant flow through all recesses was considered and conditions of no movement of the sliding surface were assumed. The model was subsequently modified to a variant with discharge grooves separating individual recesses and a variant with variable recess position relative to the centre of the pocket. The results demonstrated that the pocket's ability to carry asymmetric loading increases mainly with increasing distance of the recess from the centre, followed by their size. However, this ability comes at the cost of higher performance losses in hydrostatic lubrication. The results of this work can be used for the design of pockets with different methods of pocket support or alignment.
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Sports and cultural centre, Otradov
Myška, Jan ; Nováková, Eva (referee) ; Kolář, Radim (advisor)
The subject of this diploma thesis is the preparation of project documentation for the implementation of new sports and cultural centre Otradov. The dominant feature of the complex objects stands and multipurpose hall. The building is architecturally designed with an effort to fit in too much of rural architecture. Multipurpose hall has two floors, one third roofed flat roof, two-thirds of the roof ridge. The core system is aerated concrete blocks. The building is two-storey grandstand with the carrier deck. Roofing is solved by means of broken wooden beams. Sanitary facilities is dealt wall system and roofed shed roof. Athletics track, the surface of the polyurethane mixture designed for sports.
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The effect of surface grooves on point contacts lubrication
Matoušek, Kamil ; Čermák, Jan (referee) ; Šperka, Petr (advisor)
This diploma thesis deals with experimental study of the effect of surface grooves on distribution of lubricant film in elastohydrodynamic lubricated point contact. Lubricant film thickness was measured by ball-on-disc apparatus using an optical interferometry technique - thin film colorimetric interferometry. The effects of groove geometry, lubricant and operating conditions were studied in this diploma thesis. The effects of these variables are evaluated based on newly suggested parameter Rgi (groove influence ratio). Groove influence ratio is defined as an influenced film thickness influenced by groove divided by film thickness for smooth surfaces.
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Measurements in an 802.11n radio network with hidden nodes
Vágner, Adam ; Komosný, Dan (referee) ; Münster, Petr (advisor)
The current large concentration of wireless networks brings new horizons, but also new concerns. Failure to follow basic rules may produce far-reaching problems that could make more wrinkles to all affected managers and administrators. The aim of this thesis was to measure and compare the radio parameters of selected products and how they behave in neighboring interference and the speed they have while there are hidden nodes. The resulting values were measured in the laboratory network Wificolab and compared with the various support protocols. Possible effects on the specific situation are also analyzed in this thesis.
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Single-Phase Induction Motor Calculation
Ševčík, Pavel ; Vítek, Ondřej (referee) ; Hájek, Vítězslav (advisor)
This master's thesis considers by single-phase asynchronous motor. The first part discuss about construction, principle of operation and basic parameters of this motor type. It also discussed the emergence of torque and torque characteristics of the different types of engines. The second part explains the basic ways of obtaining grip moment including outline the principles of functions particulars constructions types, which is produce in practice. In the third part is minutely analyse single-phase asynchronous motor with auxiliary phase and permanently conect capacitor, including method of assign size of a capacitor. Fourth part section provides the principles of the procedure for calculating basic parameters of the single asynchronous motor with auxiliary phase. At the last part is accomplished a calculation of single-phase asynchronous motor with permanently conect capacitor at auxiliary phase including comparation with already manufacturing motor.
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Sports and cultural centre, Otradov
Myška, Jan ; Nováková, Eva (referee) ; Kolář, Radim (advisor)
The subject of this diploma thesis is the preparation of project documentation for the implementation of new sports and cultural centre Otradov. The dominant feature of the complex objects stands and multipurpose hall. The building is architecturally designed with an effort to fit in too much of rural architecture. Multipurpose hall has two floors, one third roofed flat roof, two-thirds of the roof ridge. The core system is aerated concrete blocks. The building is two-storey grandstand with the carrier deck. Roofing is solved by means of broken wooden beams. Sanitary facilities is dealt wall system and roofed shed roof. Athletics track, the surface of the polyurethane mixture designed for sports.
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The effect of surface grooves on point contacts lubrication
Matoušek, Kamil ; Čermák, Jan (referee) ; Šperka, Petr (advisor)
This diploma thesis deals with experimental study of the effect of surface grooves on distribution of lubricant film in elastohydrodynamic lubricated point contact. Lubricant film thickness was measured by ball-on-disc apparatus using an optical interferometry technique - thin film colorimetric interferometry. The effects of groove geometry, lubricant and operating conditions were studied in this diploma thesis. The effects of these variables are evaluated based on newly suggested parameter Rgi (groove influence ratio). Groove influence ratio is defined as an influenced film thickness influenced by groove divided by film thickness for smooth surfaces.
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On the production of special grooves in pipes
Smítal, Tomáš ; Humár, Anton (referee) ; Píška, Miroslav (advisor)
This work was created in cooperation with company Mubea. Introduction part describes purpose of automotive headrest and function of special grooves, which are fitted on headrest frame. Overview of manufacturing technologies of these grooves with short summary of their advantages and disadvantages follows. The main part of this work consists of development of new alternative technology for manufacture special grooves in thin-walled tubes with following experimental verification of technological conditions and shape of grooves. This work also contains evaluation of tool life and wear. Interpretation of the results is performed by calculations and graphically.
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