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Bearings for large scale applications
Herník, Martin ; Šperka, Petr (referee) ; Michalec, Michal (advisor)
Bearings are currently an indispensable part of industrial machines, that carry out rotational or translational motion. This bachelor's thesis discusses the use cases of bearings for large-scale applications such as wind propellers, space telescopes and many other examples in various areas of industry. At the beginning, individual types and types of bearings are divided. The largest part is devoted to the description of the use of individual types of bearings about their presence in large machines. In the final part, the design and clear division of suitable types of bearings for a specific applications is carried out.
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Steam turbine for biomass power plant
Urbánek, Roman ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
The master's thesis deals with the design of a condensing steam turbine for a biomass power plant with off-takes for heating heaters with a temperature drop of 60/80 °C in summer and 70/125 °C in winter, and off-takes for low-pressure regeneration. The nominal thermal output of the heat exchangers is 0-10 MWt in summer and 0-50 MWt in winter. The thesis includes a detailed design of the flow parts of the steam turbine, from the design of the control stage, the staged part of the turbine, and the strength verification of individual stages to the design of the balancing piston, sealing system, and bearing design. In conclusion, the operational characteristics of the proposed steam turbine are depicted.
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Vibrodiagnostics of electrical machines
Petráček, Samuel ; Cipín, Radoslav (referee) ; Janda, Marcel (advisor)
This bachelor's thesis deals with getting to know vibrations and their description. What types of vibrations occur, what are their parameters, such as deflection or acceleration, and a slightly described frequency analysis for non-harmonic signals. Subsequently, the sources of vibrations in electric rotating machines are described. Types of vibration sources are described here, for example of mechanical origin or on the bearing. The causes of their occurrence are, for example, rotor imbalance, rotor misalignment or mechanical loosening. And their subsequent effect on the machine in axial and radial directions. Furthermore, the Crest Factor measurement method and a summary of other diagnostic methods of vibrodiagnostics such as Envelope Analysis and Kurtosis Factor are described. For what purposes these methods are used and their advantages and disadvantages. In the practical part, 4 asynchronous motors were measured with prerequisites for faults with rotor eccentricity. The effective values of the vibrations and the Crest Factor were calculated here, followed by a frequency analysis using FFT (Fast Fourier Transform). In the end, the resulting data were evaluated.
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Vibration measurement processing for predictive maintenance of mechanical systems
Kuchař, Matěj ; Dobossy, Barnabás (referee) ; Kšica, Filip (advisor)
As technology evolves, so does maintenance. In recent years, predictive maintenance has developed the most and is increasingly used. In the case of vibrations in particular, this type of maintenance brings better results than the types of maintenance previously used. Compared to other types of maintenance, predictive maintenance is more difficult to implement. When implementing it is necessary to follow its procedure: data pre-processing, feature extraction, determination of the health indicator, training of the predictive model, and evaluation.There are many software programs that provide features for predictive maintenance. In this thesis, the Predictive Maintenance Toolbox from the Matlab was used. Subsequently, the knowledge of the implementation of predictive maintenance was applied to the experimental data obtained by measuring bearing vibrations to predict RUL.
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Failure analysis based on measurement of vibrometric data
Jánoš, Vít ; Klusáček, Stanislav (referee) ; Šedivá, Soňa (advisor)
This paper deals with the analysis of vibration data from a screw compressor. A single axis piezoelectric sensor is used for the measurements. Within the scope of this work, a software is developed to retrieve the measured data through REST API and perform further processing such as frequency spectrum analysis, envelope analysis or signal cepstrum calculation. An algorithm to compute a fast kurtogram has also been implemented. Kurtogram is used for determination of demodulation band prior to envelope analysis The measured data and the indicators from the analyses are stored in a database.
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Steam turbine for biomass heating plant
Cmajdálka, Ondřej ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
This master thesis deals with the design of a condensing steam turbine for a biomass block burning wood chips with one regulated take for a hot water heat exchanger. The temperature gradient for the hot water is 90/110 ° C. The thesis guides through the designing proces of a steam turbine from the thermal scheme proposed according to the specified parameters, through the design of the regulatory stage and the stage part of the turbine, including strength calculation, to the design of the compensating piston, seals system and bearings. Finally, the operating characteristic of the turbine is constructed.
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Design of spindle turning center
Krajča, Martin ; Knoflíček, Radek (referee) ; Pavlík, Jan (advisor)
This master´s thesis deals with the design of the headstock of a turning center. The aim of the work is the design solution of turning headstock with output of about 5 kW with the possibility of positioning in the C axis. The introductory part of this thesis is focused on the descripti-on of the basic parameters of the headstock and turning centers on the market. The next part deals with choice of cutting conditions and calculation of spindle parameters. These calculations are verified using the FEM method. Based on the calculations and design requirements, a headstock model with drawing documentation is created.
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Visual inspection of axial bearing
Sýkora, Vojtěch ; Richter, Miloslav (referee) ; Janáková, Ilona (advisor)
This thesis is about visual control and measurement of bearings by using image sensors and it is about providing appropriate conditions for this measurement. It describes the selection of suitable hardware to solve this case. A large part of the thesis is the design and creation of my own light. Furthermore, algorithms for processing the acquired images of bearings are proposed. The result of the processing is the determination of the type of bearing in the image and the finding of possible defects.
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Steam Turbine for the Waste to Energy
Janata, Petr ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
The master thesis deals with the design of a condensing steam turbine for a waste incineration plant with regulated take for a heat exchanger, which has a heat output of 15 MWt and a temperature gradient of 60/90 °C. In the thesis, a thermal scheme was first designed, which was based on the required design parameters. The maximum mass flow of steam into the turbine is 38 t/h. The pressure and temperature of the admission steam is 37 bar and 440 °C. The degassing temperature is 105 °C and the cooling water temperature at the condenser inlet is 20 °C. The following is the design and thermodynamic calculation of the turbine flow channels. The first stage of the turbine is designed as a regulatory with equal pressure blades. The rest part of the turbine is designed with overpressure blades and is divided into 6 cones, in which there are a total of 27 stages. The strength inspection of the designed blade profiles was performed. A compensating piston and a gland system were designed. Finally, bearings for the rotor were designed and then the operating diagram of the turbine was constructed. The work is supplemented by a structural drawing of the longitudinal section of the turbine.
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