Journal
MEASUREMENT
Volume 174, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2021.108983
Keywords
Journal bearing; non-Gaussian rough surface; Misalignment; Performance
Funding
- National Natural Science Foundation of China [51875166, 51705127]
- Tribology Science Fund of the State Key Laboratory of Tribology [SKLTKF18A05]
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This study investigates the coupling effects of non-Gaussian properties and misalignments on the performance of journal bearings, finding that non-Gaussian rough surfaces have a more significant influence on static performance, with negative skewness and large kurtosis increasing load capacity and decreasing friction coefficient. Non-Gaussian properties have a greater impact on performance than misalignment in hydrodynamic lubrication regime.
In the hydrodynamic lubricated journal bearing system, the surface roughness and angular misalignment are two critical factors that affect bearing?s performance. In this paper, the coupled effects of different non-Gaussian properties and misalignments are investigated on the performance of journal bearings. Christensen?s stochastic model is extended by improving the probability density function of random roughness heights, which incorporates the Gram-Charlier expansion including skewness and kurtosis. In comparison with a Gaussian surface, the non-Gaussian rough surface has more significant influence on the bearing static performance. The negative skewness and large kurtosis increase the load capacity and decrease the friction coefficient. According to the simulations and experiments, non-Gaussian properties have more impact on the performance than misalignment when the journal bearing is operated in hydrodynamic lubrication regime based on different pressure distributions and vibration responses. These novel findings provide the basis for monitoring the conditions of hydrodynamic journal bearings.
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