Testing of Bearing Materials for Large Two-stroke Marine Diesel Engines

Peder Klit, Sebastian Persson, Anders Vølund

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    Abstract

    In large two-stroke marine diesel engines bearings are designed with the intention that these need not be replaced during the life of the engine. The design has shown very good service experiences. The design parameters of the main bearings are, among others, based on the average maximum specific load which the bearing should operate under. In general, the frictional loss is less than 1% of the nominal power of the engine but is still a target for optimization. Fatigue mechanisms of bearing lining material are not fully understood and the design limits with regards to minimum oil film thickness, max oil film pressure and oil film pressure gradient is not established. Large two-stroke journal bearings are not suitable for fatigue test due to the size, the low rotational speed and the complexity of such test-rig. The Disc Fatigue Test Rig (DFTR) was designed with the purpose to test white metal coatings under realistic bearing conditions, in a confined time-frame. The test-rig simulates a scale model of a thrust bearing, in contrary to standard design the bearing lining material is applied to the rotating collar. On each side of the disc three stationary tilting-pads applies a load to the test disc, with a rotational speed of 2000 rpm. Parameters, such as bearing load, rotational speed, oil temperature, oil contamination is controlled/monitored in order to achieve repeatability and a systematic approach to the experiments. Test performed on the test-rig shows good correlation on the fatigue cracks with those experienced on large two-stroke journal bearings.
    Original languageEnglish
    Title of host publication12th EDF - Pprime Workshop: “Solutions for performance improvement and friction reduction of journal and thrust bearings”
    Number of pages13
    Publication date2013
    Publication statusPublished - 2013
    Event12th EDF - Pprime Workshop - Futuroscope, France
    Duration: 17 Sep 201318 Sep 2013
    Conference number: 12
    http://edf-pprime-2013.sciencesconf.org/

    Workshop

    Workshop12th EDF - Pprime Workshop
    Number12
    Country/TerritoryFrance
    CityFuturoscope
    Period17/09/201318/09/2013
    Internet address

    Keywords

    • Fatigue
    • White Metal
    • Crack Propagation
    • Journal Bearing

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