NDLI: Fibre Optic Sensors for Long-Term Monitoring of Oil Film Pressure in Diesel Engine Main Bearing

Content Provider	Springer Nature Link
Author	Kapulainen, Markku Ronkainen, Helena Hokkanen, Ari Stuns, Ingmar Varjus, Simo Nyyssönen, Sami Turunen, Raimo Halme, Jari
Copyright Year	2014
Abstract	The oil film pressure is one of the key parameters in journal bearings influencing the performance of the bearings. A fibre optic sensor was developed for online determination of actual oil film pressure under load without disturbing the actual tribological contact. Four optical sensors were integrated in a hydrodynamic journal bearing of a Wärtsilä Vasa 4R32 LN E medium-speed diesel engine with four cylinders, maximum power of 1,640 kW and rotating speed on 750 rpm. Online engine tests were carried out with different loads to study the sensor operation in real operating conditions. The engine tests were repeated six times over 4 years of operation reaching up to thousand hours of the engine use. The results showed differences in bearing pressure depending on the position of the sensor and on the operating cycle of the cylinders. The pressure peaks of all four cylinder work cycles could be identified in the measured pressure curves, and the pressure variations within the pressure curves fit well to the diesel engine’s work cycle and mass forces. The sensors had good repeatability over the whole test period.
Starting Page	47
Ending Page	54
Page Count	8
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	56
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2014-08-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Journal bearing Fibre optic sensor Diesel engine Oil film pressure Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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