Influence of sea wave shock on transient start-up performance of water-lubricated bearing

Peng, Liang; Li, Xingyang; Guo, Feng; Cao, Yuzhe; Zhang, Xiaohan; Jiang, Fulin

doi:10.1016/j.triboint.2021.107332

Cited by 32 publications

(15 citation statements)

References 38 publications

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“…Step 5: Check whether the solutions are converged according to the criterions (45). If satisfied, continue to the next step, if not, the fluid film thickness needs to be recalculated and updated, and return to step 2.…”

Section: Solution Proceduresmentioning

confidence: 99%

“…To calculate the elastic deformation, Winkler hypothesis equation 45,46 is introduced as follows: where T shell represents the thickness of bearing shell, ν 0 is the equivalent Poisson's ratio related to the working conditions which is expressed as: Micro-grooves with different geometric shapes are displayed in Figure 2. The corresponding mathematical expressions of single micro-groove are expressed as follows: For non-micro-groove surface For straight-groove surface For left spiral-groove surface For right spiral-groove surface For left herringbone-groove surface For right herringbone-groove surface where c x, c z and c g represent the length, width and depth of the micro-grooves in x , z and y directions, respectively, ψ represents the deflection angle between the side of the micro-groove and the oz axis.…”

Section: Mathematical Modelmentioning

confidence: 99%

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Effect of micro-grooved surface on the static and dynamic characteristics of journal bearings with misalignment

Shi

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a hydrodynamic lubrication model to investigate the static and dynamic characteristics of micro-grooved bearings considering journal misalignment. An averaged Reynolds equation with the mass conservation is derived and numerical procedure is solved by the finite difference method. The influences of eccentricity ratio, misalignment and micro-groove parameters on lubrication performances of aligned/misaligned journal bearings are compared systematically. Mathematical expressions of five micro-grooves with different geometric shapes i.e., straight-groove, left spiral-groove, right spiral-groove, left herringbone-groove and right herringbone-groove are given. The results show that with the increase of degree of misalignment, the load carrying capacity, main stiffness and damping coefficients increase, and the friction coefficient decreases, while the effect of misalignment angle on bearing performance is opposite. The results also indicated that the left herringbone-groove has better performance improvement for aligned journal bearing, while the right spiral-groove has better performance improvement for misaligned journal bearing under the optimal micro-groove parameters, especially at low eccentricity ratio. Moreover, the amount of the performance improvement of micro-grooved bearing depends on the design of the micro-groove parameters. This study can provide theoretical guidance for the design optimization of micro-grooved journal bearings with misalignment.

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Section: Solution Proceduresmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

Effect of micro-grooved surface on the static and dynamic characteristics of journal bearings with misalignment

Shi

Zhang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…5 Comparing with steel, the ceramic has the unique characteristics of low density, high hardness, and hightemperature resistance, so it is of great engineering significance to investigate the performance of the hybrid ceramic bearings in the starting stage. [6][7][8][9] Muthunilavan et al 10 compared the rolling friction process of different ceramic and steel hybrid friction pairs under the dry friction and lubricant conditions. Ramkumar et al 11 studied the wear characteristics and lubrication state of the ceramic ball and steel ball on the surface of the steel disc and confirmed that the wear resistance of the silicon nitride ball was better than that of the bearing steel ball through sliding wear test experiments.…”

Section: Introductionmentioning

confidence: 99%

A study on the tribological behavior of hybrid and all-steel rough sliding contacts

Long

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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Hybrid bearing is a kind of bearing that uses ceramic materials instead of steel and other metal materials as rolling elements. It is often used to reduce (i.e., rolling or sliding) friction resistance. Although many published works have shown that hybrid bearings are more effective than ordinary bearings in reducing friction resistance, improving service life, and reducing the occurrence of bearing failure, many few works have been focused on the tribological properties of hybrid bearings only under sliding friction conditions. Therefore, it is crucial to understand the tribological behavior of the bearing materials to evaluate the sliding tribological process. In this paper, the tribological properties of silicon nitride-bearing steel friction pair (Si3N4-GCr15 pair) and bearing steel-bearing steel friction pair (GCr15-GCr15 pair) under oil lubrication were experimentally studied. An optical three-dimensional (3D) reconstruction method was used to investigate the microscopic and 3D morphologies of the friction pairs during the wear evolution process. The results show that the changing trends of the micrograph, 3D topography, friction coefficient, and surface roughness are consistent. A wear failure evaluation model was built based on the data extracted from the worn surface morphology. The model indicated that the friction performance of the Si3N4-GCr15 pair is better than that of the GCr15-GCr15 pair. The mechanism of friction performance of different friction pairs under lubrication conditions is studied, which provides good reference for the design of subsequent hybrid bearings.

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“…Greenwood and Williamson [24] or Greenwood and Tripp [25] elastic asperity contact models assume the Gaussian distribution of asperity heights. These elastic contact models have extensively been used by many researchers for the mixed-EHL analysis of WLJB [18,[26][27][28][29][30]. The roughness of bushing liner surface of WLJB is comparatively higher than journal surface [18].…”

Section: Introductionmentioning

confidence: 99%

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

Prajapati¹,

Ramkumar²

2022

Surf. Topogr.: Metrol. Prop.

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Water-lubricated journal bearings (WLJB) are one of the important components of the stern tube shaft. Surface topography of WLJB is an important aspect in the design of stern tube shaft, and significantly affects the lubrication characteristics of WLJB. This work aims to investigate the effect of non-Gaussian surface topography on tribological performance of water-lubricated journal bearing (WLJB) under mixed-elastohydrodynamic lubrication (mixed-EHL) regime. The non-Gaussian flow factors, and a normalized Weibull probability density function is used to tackle the non-Gaussian roughness in hydrodynamic and asperity contact models respectively. From results, it is observed that skewness (Ssk) significantly affects both asperity contact pressure and hydrodynamic pressure along circumferential direction of bearing. It is concluded that for skewness, Ssk = -1 to 1, lambda ratio falls between 1 to 3. The relation between altitude angle and skewness is established. The effect of bearing length to diameter (L/D) ratio on lubrication performance of WLJB is also discussed in detail.

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Influence of sea wave shock on transient start-up performance of water-lubricated bearing

Cited by 32 publications

References 38 publications

Effect of micro-grooved surface on the static and dynamic characteristics of journal bearings with misalignment

Effect of micro-grooved surface on the static and dynamic characteristics of journal bearings with misalignment

A study on the tribological behavior of hybrid and all-steel rough sliding contacts

Surface topography effect on tribological performance of water-lubricated journal bearing under mixed-EHL regime

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