The SKF University Technological Centre for Grease Lubrication at the University of Twente has an opening for a PhD candidate. The goal of this 4-year project is to measure and model film thickness in grease lubricated cylindrical roller bearings. This requires a thorough understanding of Elasto-Hydrodynamic Lubrication (EHL), thin film lubrication properties of oils, and grease lubrication mechanisms. The overall result is a semi-empirical model for predicting film thickness in cylindrical roller bearings for various greases, under various conditions. This project is executed in close collaboration with SKF, a leading global bearing manufacturer, and Shell, a leading global base stock and lubricant manufacturer.
Bearings are the most widespread machine elements after nuts and bolts. There are more than 50 billion bearings operating in the world at any time. 80-90% of bearings are grease lubricated. The reliability or life of a grease lubricated bearing is dominated by the quality of the lubricating film that separates the rolling elements (balls or rollers) from the rings. The quality of the film is determined by its thickness and ‘lubricity’. The film thickness determines the contact ‘intensity’ from the stresses caused by asperity interaction. Grease lubrication mechanisms can be complex. Unlike oil lubrication in which the contacts are fully flooded, grease lubricated contacts are often ‘starved’ (with no lubricant in some regions of the contact). Severe starvation can lead to ‘parched lubrication’. The challenge here includes developing a consistent model and practical methodology for determining film thickness in cylindrical roller bearings (CRBs).
The UT provides a dynamic and international environment, combining the benefits of academic research with a topic of high industrial relevance, excellent working conditions, an exciting scientific environment, and a green and lively campus. We offer:
Please submit your application before November, 8th 2021 by using the “Apply now” button. Applications should at least include the following:
For more information, please contact Dr. Jude A. Osara, PE (firstname.lastname@example.org) or Prof.dr.ir. Piet M. Lugt (email@example.com).
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|Titel||PhD Position: Film thickness in Grease Lubricated Roller Bearings|
|Employer||University of Twente|
|Job location||Drienerlolaan 5, 7522 NB Enschede|
|Gepubliceerd||september 10, 2021|
|Sluitingsdatum||november 7, 2021|
|Vakgebieden||Statistiek,   Chemische techniek,   Programmeertalen,   Mechanische techniek  |