SYMPOSIA PAPER Published: 01 December 2022
STP163420210020

Functional Criteria for Condition Monitoring Using Tribological Quantities

Source

Conditioning monitoring of lubricants in operation usually considers different physical and chemical quantities but not functional properties. The identification of the induction time or offset point (“cliff” or “jumping-off point”), after which wear and friction will increase, and thus improve the reliability of judgments and extend the service life on a knowledge-based decision. Tribological quantities are therefore combined with analytical sciences (analysis, viscometrics, degradation, and water and fuel dilution). This approach is not limited to condition monitoring but can also be applied to oil development. The origins of the increase in friction and wear or the failure in bench or full-scale tests can be derived from SRV® testing of oil samples taken at different engine test times and correlating these with their friction, wear, and extreme pressure data in respect to depletion curves for specific additives or other oil properties. A root-cause analysis is enabled by plotting tribological SRV data versus oil properties. This methodology supports the interpretation of engine tests as an auxiliary method because it enhances the value of expensive engine tests.

Author Information

Woydt, M.
MATRILUB, Berlin, DE
Schneider, A.
Optimol Instruments GmbH, Munich, DE
Novotny-Farkas, F.
Alanovaplatz, Schwechat, AT
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Pages: 361–376
DOI: 10.1520/STP163420210020
ISBN-EB: 978-0-8031-7715-4
ISBN-13: 978-0-8031-7714-7