Wear Development in Oscillating Rolling Element Bearings

Wandel, Sebastian; Bartschat, Arne; Glodowski, Jakob; Bader, Norbert; Poll, Gerhard

doi:10.3390/lubricants11030117

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…A broader evaluation of the test is not available. Furthermore, a direct link between the change in surface roughness and friction torque is not reasonable, as can be seen by Wandel et al [32]. After the initiation of damage by a lack of lubricant, several wear mechanisms can occur in succession.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2023

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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.

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Section: Discussionmentioning

confidence: 99%

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

et al. 2023

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“…In the second test run 140 sequences have more than 1000 cycles. Wandel et al reported on clearly visible wear in oscillating ball bearings after 1000 6 cycles at a contact pressure of 2 GPa [22]. Each test consists of several million sample points, which causes complete plots to provide little useful information.…”

Section: Test Programsmentioning

confidence: 99%

Results of wear endurance runs of wind turbine pitch bearings

Stammler,

Geibel

2024

J. Phys.: Conf. Ser.

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Pitch bearings of wind turbines connect the rotor blade and the rotor hub. They have to cope with highly dynamic and stochastic loads and oscillating movements for lifetimes of 20 years and more. While several test rigs for pitch bearings are in operation, only very limited data is publicly accessible. Oscillating bearings typically suffer from wear, and this work covers the results of wear endurance tests of full-scale pitch bearings. Four bearings were tested approximately 120 days each under realistic conditions which included dynamic loads in five degrees of freedom. The bearings did not show any or very limited signs of raceway wear, in contrast to results of small-scale tests and short-term tests under worst-case conditions.

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