A reliability assessment model for journal bearing based on natural degradation and random shocks

Tao, Yourui; Zhao, Jianhui; Feng, Shizhe

doi:10.1007/s12206-020-1022-6

Cited by 8 publications

(3 citation statements)

References 29 publications

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Section: Introductionmentioning

confidence: 99%

“…Several studies have been conducted on the shock behavior of different types of bearings, including oil bearings [31][32][33][34], air bearings [35,36] and water-lubricated bearings [37]. One study found that as the amplitude of random shock load increases, the average service life of sliding bearings decreases [31]. Another investigation revealed that rotor stability and vibration amplitude were favorable when foil bearings supported the rotor under various test conditions [35].…”

Section: Introductionmentioning

confidence: 99%

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Lubrication Performance of Misaligned Journal Bearings with Flexible Structure under Shock Load Conditions

Hong,

Jeon

2023

Lubricants

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Bearings might be damaged due to shock loads caused by disturbances, in addition to static loads. In this study, a flexible structure was applied to enhance the lubrication characteristics of misaligned journal bearings subjected to impact loads. When an impact load is added to the bearing, a misaligned journal bearing has a high possibility of metal-to-metal contact. It might also lead to failure. Misalignment can occur at any time during bearing operation. A flexible structure is applied to the end of the bearing as a way to improve lubrication performance in a system where impact loads might be applied. The bearing’s lubrication performance was numerically assessed under unsteady-state conditions. An elastohydrodynamic lubrication analysis was conducted, taking into account elastic deformation. The lubrication characteristics of misaligned journal bearings were compared with the dimensionless minimum film thickness. The flexible structure and elastic modulus of the bearing were investigated so that it could support the load without contact according to the change in the maximum magnitude of the impact load. When subjected to oil film pressure, this flexible structure underwent elastic deformation, resulting in enlargement of the oil film. A misaligned journal bearing with a suitable flexible structure provided stable lubrication without metal-to-metal contact, even under shock load conditions. The flexible structure was incorporated into the high-load-bearing region of the journal bearing as a groove. Therefore, the application of a flexible structure in misaligned journal bearings can effectively enhance lubrication performance in misaligned conditions and under shock loads.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lubrication Performance of Misaligned Journal Bearings with Flexible Structure under Shock Load Conditions

Hong,

Jeon

2023

Lubricants

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“…Tao developed a competitive failure model with random shocks that can be effectively applied to condition monitoring and reliability evaluation of plain bearings [20].…”

mentioning

confidence: 99%

Reliability Evaluation of CNC Machine Tools Considering Competing Failures of Fault Failure Data and Machining Accuracy Degradation Data

Feng

Yang

Chen

et al. 2021

Preprint

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Traditional reliability evaluation of CNC machine tools usually considers a single failure mode of fault failure or degradation failure, or considers fault failure and degradation failure to be independent of each other. However, in the actual working conditions, fault failure and degradation failure are mutually affected, and the reliability evaluation of the competing failure models of CNC machine tools by considering the two failure modes comprehensively can get more accurate evaluation results. Therefore, this paper proposes a reliability evaluation method for CNC machine tools considering fault failure data competing with machining accuracy degradation data. A fault failure model of CNC machine tools is established based on a non-homogeneous Poisson process. The fault failure model is updated according to the different effects of each maintenance result of the failure on machining accuracy. By integrating multiple geometric errors of CNC machine tools through multi-body system theory, the amount of machining accuracy degradation is extracted. A machining accuracy degradation failure model is established using the Wiener process. Considering the correlation between fault failure and degradation failure, a competing failure model based on the Coupla function is developed for evaluating the reliability of CNC machine tools. Finally, the effectiveness of the proposed method is verified by example analysis.

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Dynamic bearing characteristics of the ship stern shaft-bearing system with wave impact

Li,

Ouyang,

Liu

et al. 2024

Ocean Engineering

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A reliability assessment model for journal bearing based on natural degradation and random shocks

Cited by 8 publications

References 29 publications

Lubrication Performance of Misaligned Journal Bearings with Flexible Structure under Shock Load Conditions

Lubrication Performance of Misaligned Journal Bearings with Flexible Structure under Shock Load Conditions

Reliability Evaluation of CNC Machine Tools Considering Competing Failures of Fault Failure Data and Machining Accuracy Degradation Data

Dynamic bearing characteristics of the ship stern shaft-bearing system with wave impact

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