Purpose
This study aims to investigate mixed lubrication performances of stern bearing in a misaligned state considering turbulence and bearing deformation impacts.
Design/methodology/approach
A mixed lubrication model of stern bearing is established. The generalized average Reynolds equation governing the turbulent flow of lubricant is analyzed by considering the interaction of bearing elastic deformation, asperity contact pressure and film pressure. The bearing behaviors including minimum film thickness, hydrodynamic pressure, asperity friction force and frictional coefficient are studied under different models. The correctness of this model is verified by comparing it with that of the published data.
Findings
Numerical results indicate that elastic deformation noticeably decreases the maximum film pressure, the asperity contact force and the friction coefficient in the mixed lubrication stage. The effect of elastic deformation and turbulence reduces the transition speed from mixed to liquid lubrication.
Originality/value
This model includes both turbulence and bearing deformation impacts on journal bearing performances. It is expected that the numerical results can provide useful information to establish a stern bearing exposed to mixed lubrication conditions.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2022-0352/
In this paper, the weldablity of a low-carbon Cu-bearing age-hardening steel was
evaluated using Y-groove cracking evaluation test. The results show that the steel has a low
hardenability characteristic and cold-cracking susceptibility. It is also indicated that a crack-free
weldment can be obtained during welding of this type of steel even at an ambient temperature as
low as -5°C as well as in an absolute humidity lower than 4000Pa without any preheat treatment. A
slight preheat treatment can prevent the joint from cracking when welding is carried out at lower
ambient temperature or in higher absolute humidity.
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