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Bearings for space
Vavřík, Petr ; Nečas, David (referee) ; Košťál, David (advisor)
Currently, space satellites in orbit are required to operate reliably for more than 10 years. This places high demands on the satellite's tribological systems, which must function properly in the hostile space environment for this period. This bachelor thesis deals with the description of suitable bearings and their lubrication for space applications. Lubrication regimes are described at the outset. Then, space factors affecting the proper operation of tribological systems are summarized. The largest part is devoted to the description of the most used bearings and lubricants. The thesis concludes with the design of suitable bearings and their lubrication for the satellite reaction wheel.
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Design of apparatus for testing of bearings
Sovadina, František ; Šperka, Petr (referee) ; Svoboda, Petr (advisor)
In this bachelor thesis an analysis of used test devices for durability of the rolling bearing was performed. This analysis then serves as an inspiration for the reconstruction of the existing bearing test facility at FME BUT. Three conceptual designs have been developed and, after consideration of all aspects, drawing documentation for the final variant has been produced. Its design will lead to space saving in the laboratory and easier handling of test equipment in durability tests.
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Theoretical analysis of bearing production
Prno, Peter ; Jaroš, Aleš (referee) ; Kalivoda, Milan (advisor)
The first part of this thesis was devoted to the characteristics of bearings and their importance in technical practice. The second part has a search character. It deals with an overview of the conventional methods of sliding and rolling bearings production. This is the main part of this thesis. Part of the thesis is also compilation of technological process of production of selected part of rolling bearing. This is the outer ring of the axial spherical roller bearing.
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Rolling bearings for electromobility
Mbontar, Patrik ; Frýza, Josef (referee) ; Šperka, Petr (advisor)
The aim of this bachelor thesis is to describe the problems related to the use of rolling bearings in electric vehicles. Introduction includes history, distribution, and a brief description of the bearings. In the next section, there will be a description of the use, requirements and parameters for rolling bearings of combustion engine cars. In the main part of the thesis, the parameters and requirements of bearings used in electric vehicles and hybrid vehicles will be analyzed. I will continue with familiarization with dynamic actions affecting bearings and their critical requirements. In conclusion, the two types of cars and the possible development of this type of bearings will be compared.
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Vibration of rolling bearing
Otoupalík, Jan ; Ripel, Tomáš (referee) ; Krejsa, Jiří (advisor)
The thesis deals with vibrations caused by geometric defect and fatigue damage of rolling element bearing. Hardware for vibration measurement is tested on 25 new pieces of NJ 304. Second part of the thesis examines if measuring of bearing vibration can help to detect a geometric defect. Geometric defects are detected according to a spectrum of vibration but the results are not absolutely exact. The possibility to detect geometric defects by measuring vibration has not been proven. The end of project tests diagnostic methods for rolling element bearings. The bearing defect was simulated to demonstrate bearing failure frequencies, envelope method and vibration spectrum.
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Bearings for machine spindles
Knápek, Jiří ; Nohál, Libor (referee) ; Galas, Radovan (advisor)
This bachelor’s thesis contains the survey of bearings for machine spindles. Thesis is especially focused on slide, air, magnetic and rolling bearings. Bearings are described with emphasis on their construction, lubrication and arrangements. In the end of this thesis there is a comparison of mentioned kinds of bearings for machine spindles.
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Effect of Conformity on Friction in Roller Bearing
Pisklák, Jan ; Zikmund, Vladimír (referee) ; Vrbka, Martin (advisor)
This master’s thesis describes the influence of conformity on friction in rolling bearings. The coefficient of friction is measured on an experimental machine - Mini Traction Machine 2 – using ball-on-disc method. The results are plotted in graphs which showing the dependence of the coefficient of friction at spin-to-roll ratio for specific conformity, normal load and speed in the contact area. The influence of load, speed or different lubricant viscosity is verified for a given value of conformity. Experimentally obtained data are compared with the mathematical model developed in MatLab, within this thesis.
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Design and verification of station for calibration of AE sensors for bearing testing
Bančák, Matej ; Mazůrek, Ivan (referee) ; Mazal, Pavel (advisor)
The diploma thesis deals with calibration of AE sensors used in diagnostics of bearings. Two different conceptual solutions similar to those used in the diagnostics of bearings were designed in the design. Subsequently, the experimental device was designed for relative calibration using the rotation of bearings as a continuous AE source. The experimental part is oriented to the observation of the RMS parameter, which serves as a sensor sensitivity evaluation parameter. As sources of AE, bearings with a certain type of damage were used, which allowed for the formation of sensitivity characteristics according to the type of damage. Sensitivity characteristics of selected AE sensors have been developed to determine the effectiveness in relative calibration. The exponential sensitivity sensitivity of the MDK-13 sensors was observed on the software amplification of the AE analyzer. A proposal for the calibration method for MDK-13 type sensors was developed on the principle of comparison with the reference sensor.
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Bearings for space
Vavřík, Petr ; Nečas, David (referee) ; Košťál, David (advisor)
Currently, space satellites in orbit are required to operate reliably for more than 10 years. This places high demands on the satellite's tribological systems, which must function properly in the hostile space environment for this period. This bachelor thesis deals with the description of suitable bearings and their lubrication for space applications. Lubrication regimes are described at the outset. Then, space factors affecting the proper operation of tribological systems are summarized. The largest part is devoted to the description of the most used bearings and lubricants. The thesis concludes with the design of suitable bearings and their lubrication for the satellite reaction wheel.
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