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Diagnostics of adhesion of the tram wheel using Acoustic emission method
Skoupý, Martin ; Dočkal, Aleš (referee) ; Klapka, Milan (advisor)
The aim of the thesis is to develop a method of adhesion diagnostics of a tram wheel by monitoring the acoustic emission originating from the wheel-rail contact. Application on a twin-disk test rigs is expected. The possibilities of using both contact and contactless sensors are examined. The thesis is focused on describing the response to varying speeds, angles of attack and the change of adhesion due to the application of water into the contact. RMS and energy of the acoustic emission, kurtosis or Shannon’s entropy were evaluated. It was discovered, that form the low values of the angle of attack (10 mrad) the acoustic emission RMS rises in linear manner with further increase of the angle or speed. After the application of water, the drop of the acoustic emission corresponding to the drop of adhesion coefficient was detected. The transitional states associated with unequal distribution of water were observed following its application and during the contact starvation. This can lead to an undesirable squeal noise. Another transient phenomenon manifested by the increase of acoustic emission activity was observed preceding the contact starvation, its timing corresponds to the removal of oxide layer described in the literature. Acoustic emission therefore proved to be suitable for its study and possibly for the contact starvation prediction.
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Noise form rolling stock in Brno
Dolíhal, František ; Dočkal, Aleš (referee) ; Klapka, Milan (advisor)
This study is focused on the analysis of data from long-term noise measurements of trams at the turning loop in Brno-Komín, and at the Technological Park turning loop in Brno. Automated field measurement based on sound pressure level and frequency evaluated tram passages to determine if there was the occurrence of squealing noise while traversing tightly curved track segments. Concurrent with noise measurements, meteorological conditions (temperature, relative humidity, and rain) were recorded. Alongside data from the preceding switch memory, including vehicle identification numbers and inspection data provided by the Brno Public Transit Company, an analysis of influencing factors on the occurrence and parameters of squealing noise was conducted. A weak dependence on air humidity (and consequently temperature) was found. This revealed varied noise behavior among tramcars of the same construction. Influence of water in contact of wheel was described during process of drying tracks. Manual field measurements also suggest the influence of vehicle speed. Observations also indicate the need for future assessment of the driver's influence and overall driving dynamics (especially acceleration), which this study does not address.
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Tabletop acrylic paint shaker
Vostradovský, Tomáš ; Žáček, Jiří (referee) ; Klapka, Milan (advisor)
This bachelor thesis deals with construction of a model paint desktop shaker for small containers. Included is an overview of solutions available on the market, creation of design proposals, selection of a suitable solution and its finalization into production documentation. Following is production of a prototype and verification of its functionality.
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Smart materials application in hydraulic systems
Montag, Jakub ; Klapka, Milan (referee) ; Kubík, Michal (advisor)
This thesis deals with the application of smart materials in hydraulic systems. In the first part, the hydraulic systems themselves and smart materials are described. This is followed by specific smart materials, where the principle of function, in which fields they can be found, applications in hydraulic systems and their advantages and disadvantages are described. Finally, the materials are summarised and compared with each other.
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Re-design of the clamping of GPS module for motorcycle
Jeniš, Filip ; Dočkal, Kryštof (referee) ; Klapka, Milan (advisor)
clamping, clamp, GPS, motorcycle, FEM, analysis, design, construction, construction alteration
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Study of bearing noise regarding accuracy of machining
Studýnka, Pavel ; Sabo, Karol (referee) ; Klapka, Milan (advisor)
This bachalor thesis deals with connection between the quality of surface of raceways of a bearing and vibrations in operation. This thesis describes basic geometrical parameters of a bearing that have main influence on its resulting quality and vibrations. It presents methods to evaluate the quality of the raceways surfaces and their connection between them. As a part of the thesis is an experiment, which should prove, what is the connection between the measuring of quality of the surface of raceways and measuring the vibrations of bearings during the process, by the way used in the company KOYO Olomouc. The quality of raceways is evaluated on a measuring device MUK-F 300 and vibrations on IL 100R/2000.
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Animation of 2D gear meshing
Fiala, Vlastimil ; Klapka, Milan (referee) ; Hartl, Martin (advisor)
The bachelor thesis deals with the animation of planar involute gearing. The thesis gives a theoretical basis for understanding the problems of gears. Introduction of the work is focused on the description of the geometry and mesh of uncorrected planar gears focusing on the line of action. Gradually meshing of gear pairs with external, internal and rack gearing is described. Following part describes mesh of planar wheel with manufacturing rack, thus creating teeth flanks by rolling. The next section describes the problems of interference with the root curve and its impact on the gear's teeth number. The last part deals with correction of teeth by shifting profile and its effect on meshing ratios.
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Design of semi-automatic tool for thread machining on conventional lathe
Ondák, Andrej ; Klapka, Milan (referee) ; Dočkal, Kryštof (advisor)
Design of thread cutting rig reducing demands on machine operator of conventional lathes is shown in the following thesis. During thread cutting on lathe, operator must execute cutting tool extraction, stopping of the machine, and changing direction of the spindle in the span of few seconds. The design of an auto-retracting tool solves the problem by automatization of these steps of the production process. Therefore, three tool concepts were proposed differing in the cutting tool pull-out mechanism. One solution was chosen, whose function was substantiated by calculation. Reader can acquaint himself with construction idea behind this auto retracting tool for thread cutting. Among other things, reader can explore problems encountered during the process of the construction and its engineering solutions.
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Reconstruction of Gearbox Testing Rig
Rozsypálek, Tomáš ; Dočkal, Aleš (referee) ; Klapka, Milan (advisor)
The aim of this diploma thesis is reconstruction of gearbox testing rig. Modernization will allow fully automatic long-term gearbox tests according to pre-defined test parameters. The first part of thesis describes commercial and scientific solutions of used testing rigs. Individual solutions are inspected and evaluated for applicability to upgrade the testing rig. The second part of diploma thesis deals with selection of purchased components for allowing automatic drive, design concepts, selection of appropriate design, assembly and installation of control board and calibration of used components. This part of diploma thesis deals with analysing of software solution made for automatic drive too. The output of this work is a functional sample of control hardware and software for automatic and manual control which contains recording of measured data.
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