Experimental Determination of Stern Tube Journal Bearing Behaviour

Šestan, Ante and Šverko, Davor (2010) Experimental Determination of Stern Tube Journal Bearing Behaviour. = Experimental Determination of Stern Tube Journal Bearing Behaviour. Brodogradnja : časopis brodogradnje i brodograđevne industrije, 61 (2). pp. 130-141. ISSN 0007-215X. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q4 (2010). Točan broj autora: 2.

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The most sensitive component in the propulsion shafting system is the aft stern tube bearing, which is exposed to heavy static and dynamic propeller loads exerted to the bearing surface by the propeller shaft. The Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, and the American Bureau of Shipping intend to work on the development of the theoretical model of the stern tube journal bearing behaviour, which is proposed to be done in several stages. The initial stage is to consider nonlinear fl uid structural interaction, and this is the theory shown in this article. Owing to the fact that the shaft journal in operation lies on a lubricating fl uid fi lm, which separates the journal in the bearing from the bearing liner, the theoretical nonlinear model of the journal bearing may provide more insight in the behaviour of the shaft inside the bearing and help us to determine a more realistic elastic line of the shafting. The American Bureau of Shipping (ABS) initiated a research project to measure actual interaction between the shaft and the stern tube bearing with the goal of applying obtained knowledge in development of an accurate analytical/numerical model for shaftbearing analysis. The initial focus of the investigation was to capture the transient operation of the shaft inside the bearing and to observe the shaft’s hydrodynamic lift during starting, stopping and reversing of the engine. Proximity probes were used to monitor the shaft bearing interaction with micron precision. The installed probes measure the distance between the shaft and the bearing at eight locations inside the aft stern bush and at four locations inside the forward stern bush, and utilize obtained data to defi ne the shaft orbit and dynamics as it revolves in the bearing. The results of presented measurements show that the shaft behaviour inside the stern bush is very different depending on the locati inside the bush. Therefore, an analytical approach, which uses a simplifi ed theory of shaft bearing interaction, provides no practical value since it neglects shaft dynamics and interaction between fl uid and the structure.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): propulsion shafting system; stern tube bearing; shaft alignment; proximity sensors; alignment condition monitoring; nonlinear model of radial journal bearing
Subjects: TECHNICAL SCIENCE > Shipbuilding
TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 600 Department of Naval Engineering and Marine Technology > 650 Chair of Marine Machinery and System Design
Indexed in Web of Science: Yes
Indexed in Current Contents: No
Citations JCR: 4 (12.10.2017.)
Quartiles: Q4 (2010)
Citations SCOPUS: 4 (12.10.2017.)
Date Deposited: 04 Dec 2014 13:40
Last Modified: 12 Oct 2017 13:11
URI: http://repozitorij.fsb.hr/id/eprint/3112

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