Experimental Investigations on Wear in Oscillating Grease-Lubricated Rolling Element Bearings of Different Size and Type

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dc.identifier.uri http://dx.doi.org/10.15488/13358
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/13467
dc.contributor.author Bayer, Gernot
dc.contributor.author Bartschat, Arne
dc.contributor.author Wandel, Sebastian
dc.contributor.author Baust, Sebastian
dc.contributor.author Poll, Gerhard
dc.date.accessioned 2023-03-21T06:08:06Z
dc.date.available 2023-03-21T06:08:06Z
dc.date.issued 2023
dc.identifier.citation Bayer, G.; Bartschat, A.; Wandel, S.; Baust, S.; Poll, G.: Experimental Investigations on Wear in Oscillating Grease-Lubricated Rolling Element Bearings of Different Size and Type. In: Lubricants : open access journal 11 (2023), Nr. 3, 120. DOI: https://doi.org/10.3390/lubricants11030120
dc.description.abstract Grease-lubricated rolling element bearings can suffer from wear due to lubricant starvation under certain oscillating operating conditions. Especially for large-scale slewing bearings, such as blade bearings in wind turbines, experimental investigations are complex compared to small-scale reference testing. For an easier manner of testing, it is desirable to know whether the results of small-scale testing are applicable to larger-sized bearings. In this work, three different bearing types were tested and compared to already published results from a small-scale ACBB with a pitch diameter of 60 mm. The newly tested bearing types comprise a downscaled blade bearing (4-point contact double row ball bearing) with a pitch diameter of 673 mm, a small-scale CRTB with a pitch diameter of 77.5 mm and another ACBB with a pitch diameter of 95 mm. Qualitatively, all tested bearings show similar wear behaviour in terms of friction energy when operation parameters are varied. With higher oscillation frequency, damage becomes more severe. The oscillation amplitude shows three distinctive regimes. Within the range of small amplitudes, an increase in amplitude leads to more pronounced damage. We observe a threshold amplitude where this is no longer the case; a further increase in amplitude counteracts wear initiation until a final threshold is reached, beyond which no more wear is observed. These findings are in accordance with the reference results of the small-scale ACBB. Direct comparison between point and line contact shows that the latter is more prone to wear initiation under grease-lubricated, oscillating operating conditions. Furthermore, a previously introduced empirical number shows good performance in assessing critical operating parameters of the different bearing types. Specifically, harmful operating conditions can be classified for all studied bearing types with an accuracy of 78%. This method can be useful to assess operating conditions of greased, oscillating, rolling element bearings, e.g., to assess different pitch controllers or designs of slewing bearings. eng
dc.language.iso eng
dc.publisher Basel : MDPI
dc.relation.ispartofseries Lubricants : open access journal 11 (2023), Nr. 3
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject blade bearing eng
dc.subject false brinelling eng
dc.subject grease lubrication eng
dc.subject oscillating bearing eng
dc.subject pitch bearing eng
dc.subject.ddc 530 | Physik ger
dc.title Experimental Investigations on Wear in Oscillating Grease-Lubricated Rolling Element Bearings of Different Size and Type
dc.type Article
dc.type Text
dc.relation.essn 2075-4442
dc.relation.doi https://doi.org/10.3390/lubricants11030120
dc.bibliographicCitation.issue 3
dc.bibliographicCitation.volume 11
dc.bibliographicCitation.firstPage 120
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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