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Solid stick friction modifiers for rail transport
Ondák, Andrej ; Hajžman, Michal (oponent) ; Galas, Radovan (vedoucí práce)
The present work deals with solid friction modifiers, which are substances that have the task of reducing the contact friction of the wheels of railroad vehicles, thus reducing wear and noise emission. In order to maximise the efficiency of the system, material consumption must be kept to a minimum. When solid friction modifiers are applied, there is a danger of isolation of the contact, which is an undesirable effect regarding track systems. At the moment, both the positives and the negatives of the technology are known, but without a deeper connection to application parameters. Therefore, the experimental part of the thesis is focused on determining the influence of application on the performance of rigid friction modifiers. The thesis also focuses on the effect of the working frequency of the track systems on the contact impedance and on the consumption of the compositions themselves. As a result of the research, the application parameters strongly influence the performance of the solid compositions. It was also observed that the friction modifier tends to adhere to the surface of the body, to which it is applied and thus there is no transfer to the other body. On the contrary, it was found that the contact impedance is independent of the working frequency. The development part of the thesis is dedicated to the design of a solid composition applicator and a device for measuring the impedance and consumption.
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