NDLI: Failure Analysis and Condition Monitoring of an Open-Loop Oil System Using Ferrography

Content Provider	Springer Nature Link
Author	Levi, O. Eliaz, N.
Copyright Year	2009
Abstract	Condition monitoring of dynamic systems based on oil analysis is well known for closed-loop systems. The motivation for this work stemmed from repeating failures of Wankel engines. Failure analysis identified contact fatigue as the failure mechanism, but could not identify the cause. Thus, the objective of the work was to develop a method for condition monitoring of open-loop oil systems. A variety of analytical techniques was evaluated, including direct-reading ferrography, analytical ferrography combined with computational image analysis, atomic emission spectroscopy, and scanning electron microscopy combined with energy dispersive X-ray spectroscopy. Procedures for collection and separation of oil samples were developed. Analytical ferrography was found most useful in condition monitoring. Six engines were detected in their early failure stage. Those engines were disassembled, and contact fatigue failures in the bearing needles were observed. The quantitative image analysis allowed for a fairly objective rating of the wear level. The method developed in this work has already been implemented on a daily basis for monitoring the health of Wankel engines, with much success.
Starting Page	17
Ending Page	29
Page Count	13
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	36
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2009-05-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aviation Internal combustion engine oils Ferrography Failure analysis Oil condition monitoring Ferrous alloys, steel Needle roller bearings Abrasive wear Rolling-contact fatigue Wear particle analysis Nanotechnology Physical Chemistry Theoretical and Applied Mechanics Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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