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Analysis of influence of geometric deviations of semifinished product on following bending process
Anděl, Tomáš ; Kubík, Petr (referee) ; Vosynek, Petr (advisor)
Presented diploma thesis was created in cooperation with Siemens s.r.o., and deals with the analysis of the bending of aluminium sheets which are later used as a conductors of high voltage electrical energy. These parts are completed into assemblies which serves as connectors of particular segments of an electrical network. The problem occurs as a result of incorrect bend, because it is impossible to join these sections properly. The customer would like to verify if the defined tolerances of semi-finished products are sufficient for proper bend and in case they are not, the tolerances should be modified. Due to the requirement for running numerical simulation in one of the open source software, the Salome-Meca program environment was used.
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Confirmation of the Performance of Thermal Shock Test Chambers
Konupka, Richard ; Šedivá, Soňa (referee) ; Beneš, Petr (advisor)
The bachelor’s thesis deals with problematics of confirmation of temperature shock chamber and methodology for its successful implementation. Theoretical part deals with brief overview of environmental test chambers used for testing temperature and humidity changes on tested samples. Bachelor’s thesis also deals with analysis of methodology for confirmation of temperature chambers according to the technical standard which will be partially used for methodology proposal of temperature shock chamber. Practical part of the thesis is gradually devoted to the measurement procedure proposal, where is discussed chosen temperature sensors and fixture of sensors in the chamber. Also proposed procedure of confirmation is shown, described measurements, calculation procedures, uncertainty estimations and at the end of the thesis are discussed results.
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Sensitivity analysis of frequency filters with current active elements
Kupčík, Petr ; Koton, Jaroslav (referee) ; Kubánek, David (advisor)
This bachelor´s thesis is about sensitivity analysis of frequency filters with current active elements. Includes theory of sensitivity analysis and sensitivity function. There are two second order multifunction frequency filters analysed. The first one is filter with Current Mirrors and Inverters (CMI). The second one is filter with Current Operational Amplifiers (COA). Conclusion is description how tolerances of passive and active elements affects frequency characteristics of filters and comparison of these filters in light of sensitivity. Next chapters are occupied by another two analyses: Parametric Sweep and Monte-Carlo. These analyses are applied on two fourth order frequency filters with Differential Input / Output Current Followers (DIOCF) and also on two previous second order filters (only low-pass filters). Parametric Sweep is applied on internal parameters of active filter elements (not in case COA). During Monte-Carlo analysis passive elements have tolerance 5% and active elements are considered ideal. Conclusion is description how tolerances of passive elements (Monte-Carlo) and parametres of active elements (Parametric Sweep) affects frequency characteristics of filters.
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Gear design with tolerance analysis
Křivohlavý, Petr ; Křupka, Jiří (referee) ; Svoboda, Petr (advisor)
The thesis is concerned with tolerances of machine elements. The thesis explains dimensional and geometrical tolerance, surface texture and their interdependence. On the basis of the stated facts a simple technique is established to be followed when setting tolerance of machine elements. The procedure is further applied on the transmission that was selected from the three models on hand. The technique is focused mostly on shaft and gear tolerance. The thesis should provide the reader with understanding of how to tolerate selected machine elements.
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Methods for measuring the geometrical tolerances
Juráňová, Bára ; Michalec, Michal (referee) ; Svoboda, Petr (advisor)
The bachleor’s thesis deals with the analysis of geometric tolerancing of machine parts. The work clarifies the terms and definitions of geometric tolerancing. Simultaneously, the specifications of measuring with measuring devices and gauges, can be found here. The work also proposes a method for aplication geometric tolerance, wich is apply to the shaft od radial fan. Subsequently, the measurement of the prescribed tolerances for this part is described.
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Methods for solving the tolerance chains
Fiala, Lukáš ; Mazal, Pavel (referee) ; Svoboda, Petr (advisor)
This bachelor’s thesis deals with methods of solving dimensional chains. At the beginning, basic terms related to dimensional chains are explained. The next section describes worst case, statistical, group interchangeability and compensation methods. For better explanation, an example is solved for each method. Attention is also paid to systems in which the calculation of tolerance analysis can be performed. In conclusion, statistical and compensatory methods are used at the same assembly for comparison, and then, results are compared and evaluated. The thesis should provide the reader, in which cases it is appropriate to use a certain method.
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Application reamers with cermet cutting edge
Toman, Martin ; Plíšek, Jiří (referee) ; Kouřil, Karel (advisor)
This thesis deals with the technology of reaming aimed mainly on cermet reamers. In the introduction of the thesis, the basic parameters of precision, dimension tolerance, geometrical tolerance and surface roughness are shown. Also, the technology of reaming, parameters, geometry and sorting of the reaming tools is analyzed in depth. The overview of the world producers of reaming tools is also shown as a supplement. In the final part, an example of production optimization by replacing a reamer with a better performing one is shown. Experimental part of this thesis has been made in the cooperation with HAM-FINAL company.
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Evaluation of standard uncertainty of Climatic Chamber
Dojava, Václav ; Havránek, Zdeněk (referee) ; Šedivá, Soňa (advisor)
The thesis deals with the problematics of confirmation of the climatic chamber CTS 65/50, which is a component of CVVOZE testing laboratory. Theoretical part deals with the analysis and description of methods of confirmation of climatic chambers based primarily on technical standards. This part then contains a brief description of a theory of measurement uncertainty. Practical part deals with the design of measurement procedure, which was used for confirmation measurement of ten temperature setpoints. This section then also contains an analysis of the measured data with the evaluation of standard combined uncertainty of temperature measurement. The last part contains an evaluation of the confirmation results, which were the basis for the determination of whether the climatic chamber meets the requirements for the steady-state temperature stability inside the workspace resulting from the standards for the climatic testing
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