MODELLING GREASE RETENTIVITY FOR INTELLIGENT LUBRICATION SYSTEM
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F26%3A0201014" target="_blank" >RIV/00216305:26210/26:0201014 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
MODELLING GREASE RETENTIVITY FOR INTELLIGENT LUBRICATION SYSTEM
Original language description
This study investigates the retentivity of grease lubricants for wheel-rail flange contacts, focusing on the effects of load, slide-to-roll ratio, speed and grease quantity. Experiments were conducted using a Mini-Traction Machine in a ball-on-disk configuration. Material selection of bearing steel ensured stable contact conditions and minimized wear, enabling reproducible measurements. The results reveal that both load and slide-to-roll ratio reduce grease retentivity following a decaying power-law relationship, with similar decay exponents indicating that mechanical energy input governs lubricant depletion. Speed exhibits a dual effect: increasing speed decreases time-based retentivity but enhances sliding distance-based retentivity, consistent with elastohydrodynamic lubrication film thickness assumption. Additionally, grease quantity positively correlates with retentivity, where insufficient lubricant leads to rapid loss of friction-reducing performance. These findings provide critical insights into lubricant behavior and will be integrated with lubricant redistribution models and train line simulations to develop a digital twin for predicting lubricant effectiveness across rail networks. This combined experimental and modelling approach advances the optimization of flange lubrication strategies, ultimately improving rail system reliability, wear resistance, and energy efficiency.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
20301 - Mechanical engineering
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů