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An Experimental Research of Sanding in Wheel/Rail Contact
Machatka, Martin ; Hruška, Marek (referee) ; Omasta, Milan (advisor)
Presented master's thesis is focused on the experimental research of the sanding parameters in order to improve adhesion in the contact between wheel and rail. Sanding is the application of the sanding material directly in the wheel/rail contact. It is still common, most effective and traditional way how to deal with low adhesion problem, which is mainly caused by environmental contaminants. Research is important for the better understanding of the sanding process and also provides data, which are necessary for it's optimization and efficiency improvement. Newly developed twin-disc machine was used to carry out the presented experimental research. The influence of common contaminants on the adhesion is investigated, considering various operating parameters. Different amount of the applied sand is used to increase adhesion in the contaminated contact at various slip and rolling speed. Results show, that there is the amount of the sand, from which no significant adhesion increase occur. Obtained findings and the results presented in this thesis will be used to optimize sanding system, which will contribute to reduce cost associated with sanding and low adhesion.
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Design of test rig for measurement of adhesion and noise in wheel-rail contact
Gabriel, Tomáš ; Robenek, Dětřich (referee) ; Omasta, Milan (advisor)
This master’s thesis is dedicated to the design of an experimental rig that allows investigation of causes for noise during tram’s passing of a track curve and the developement of means to mitigate this noise. The opening section of this thesis contains theoretical background for the tribological mechanics of wheel-rail contact with emphasis on the process of noise generation, followed by an overview of laboratory tst rigs with similar purpose. Design itself is centered around the implementation of the dynamic model of wheel-rail contact using real tram wheel. Resulting test rig allows measurement of the adhesion characteristic in tangential and lateral directions and recording of the generated noise while an angle of attack is set.
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Twin-disc machine for the study of wheel-rail wear and rolling contact fatigue
Šperlich, Vilém ; Skurka, Šimon (referee) ; Galas, Radovan (advisor)
Presented thesis describes the design of an experimental device used for the study of wear and contact fatigue of wheel-rail contact. The text describes selected devices already used for the study of wheel-rail contact. The main part of the text focuses on choosing a suitable conceptual variant and the design of the resulting twin-disc machine with linear contact. The final design enables easy mounting of the specimens and their precise positioning. The final part of the text contains calculation of estimated price of this device.
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Design of test rig for measurement of adhesion and noise in wheel-rail contact
Gabriel, Tomáš ; Robenek, Dětřich (referee) ; Omasta, Milan (advisor)
This master’s thesis is dedicated to the design of an experimental rig that allows investigation of causes for noise during tram’s passing of a track curve and the developement of means to mitigate this noise. The opening section of this thesis contains theoretical background for the tribological mechanics of wheel-rail contact with emphasis on the process of noise generation, followed by an overview of laboratory tst rigs with similar purpose. Design itself is centered around the implementation of the dynamic model of wheel-rail contact using real tram wheel. Resulting test rig allows measurement of the adhesion characteristic in tangential and lateral directions and recording of the generated noise while an angle of attack is set.
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An Experimental Research of Sanding in Wheel/Rail Contact
Machatka, Martin ; Hruška, Marek (referee) ; Omasta, Milan (advisor)
Presented master's thesis is focused on the experimental research of the sanding parameters in order to improve adhesion in the contact between wheel and rail. Sanding is the application of the sanding material directly in the wheel/rail contact. It is still common, most effective and traditional way how to deal with low adhesion problem, which is mainly caused by environmental contaminants. Research is important for the better understanding of the sanding process and also provides data, which are necessary for it's optimization and efficiency improvement. Newly developed twin-disc machine was used to carry out the presented experimental research. The influence of common contaminants on the adhesion is investigated, considering various operating parameters. Different amount of the applied sand is used to increase adhesion in the contaminated contact at various slip and rolling speed. Results show, that there is the amount of the sand, from which no significant adhesion increase occur. Obtained findings and the results presented in this thesis will be used to optimize sanding system, which will contribute to reduce cost associated with sanding and low adhesion.
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