On the linear stability analysis of journal bearings – Consideration of coupled effects of anisotropic slip and surface roughness

Li, Wang Long; Huang, Zhen Hua; Lin, Ching Shan; Chen, Tzu Hsiang; Shyu, Shiuh Hwa

doi:10.1016/j.triboint.2019.05.004

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…Linearized equation of motion for rigid short rotor with point mass (M) under free vibration [22][23][24].…”

Section: Dynamic Coefficientsmentioning

confidence: 99%

“…Their findings shows that journal bearing with multiple location of slip regions is effective in reducing the lubricant rupture zone as well stability limit speed of the bearing. Li et al [24] derived Modified Reynold's perturbation equations with consideration of both random roughness and anisotropic slip effect. They observed that bearing with length to diameter ratio of equal to 5 is effective in improving critical mass parameter.…”

Section: Introductionmentioning

confidence: 99%

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Effect of slip boundary condition and non-newtonian rheology of lubricants on the dynamic characteristics of finite hydrodynamic journal bearing

Arif¹,

Kango²,

Shukla³

2022

Surf. Topogr.: Metrol. Prop.

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In the present study, the influence of various slip zone locations on the dynamic stability of finite hydrodynamic journal bearing lubricated with non-Newtonian and Newtonian lubricants has been investigated. Linearized equation of motion with free vibration of rigid rotor has been used to find the optimum location of the slip region with maximum stability margin limit. It has been observed that bearing with interface of slip and no-slip region near the upstream side of minimum film-thickness location is effective in improving the direct and cross stiffness coefficient, critical mass parameter, and critical whirling speed. The magnitude of dynamic performance parameters with slip effect is highly dependent on the rheology of lubricant. Shear-thinning lubricants combined with slip boundary condition shows higher dynamic stability as compared to the Newtonian lubricants under the conventional boundary condition. For all considered rheology of lubricants, the dynamic stability of bearing with slip effect is improving by increasing the eccentricity ratio.

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“…Linearized equation of motion for rigid short rotor with point mass (M) under free vibration [22][23][24].…”

Section: Dynamic Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of slip boundary condition and non-newtonian rheology of lubricants on the dynamic characteristics of finite hydrodynamic journal bearing

Arif¹,

Kango²,

Shukla³

2022

Surf. Topogr.: Metrol. Prop.

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“…A large number of subsequent theoretical studies have indicated that the partial-slip design (slip occurs in certain areas of a surface with no slip in others) is superior to the full-slip design and traditional no-slip design [16,17], and the slip+texture combination design can achieve improved friction performance [18,19]. Following these studies, the bearing performance under the combined action of surface roughness and boundary slip was investigated [20][21][22]. The effects of slip parameters such as slip region location [23][24][25][26][27][28], slip region shape [29,30], slip region size [19,26,30,31], slip length [19,[32][33][34], slip coefficient [15,18,35], critical shear stress [28], and texture parameters [15,19,[26][27][28]30,32,34] on the performance of the tribo-pair were also studied, and the slip design of the bearings was optimised [26,27,30,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of no-wear super-slip design of tribo-pair in load lifting and friction reduction

Hu¹,

Wang²,

Yang³

et al. 2023

Preprint

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The concept of “super-slip design” is used to investigate the influence of multiple factors on the opening and frictional forces of a tribo-pair with microscale grooves. The results demonstrate that significantly improving the load-carrying capacity and reducing the viscous friction can be simultaneously realised by super-slip modification of the bottom surface of the hydrodynamic groove as a result of the joint action of the super-slip surface, groove geometrical parameters, and operating conditions. This is expected to further enhance the load-carrying capacity and reduce friction by applying shear stress on the interface of the liquid film and superslippery surface of the groove bottom. The superslippery surface does not fail because of rubbing, and the logical relationship between the performance parameters and groove depth changes unusually under this design.

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“…Generally, the traditional methods suggest that the critical failure surface is a failure surface with the minimum SF 18–23 . However, this solution seems to be powerless for some special problems.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the traditional methods suggest that the critical failure surface is a failure surface with the minimum SF. [18][19][20][21][22][23] However, this solution seems to be powerless for some special problems. For example, if the SFs of both potential failure surfaces are smaller than 1, which one of them slides first?…”

Section: Introductionmentioning

confidence: 99%

Identification of arbitrarily shaped critical 3D failure surface of a slope based on the sliding direction

Sun,

Yu,

Dong

2023

Num Anal Meth Geomechanics

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The determination of critical failure surface and stability evaluation of 3D slopes have been a hot and difficult problem in geotechnical engineering. The conventional method defines the critical failure surface using the safety factor (SF) whereas it is powerless for some special problems, such as two different failure surfaces with equal SFs. So far, many studies on the critical failure surface of a 3D slope have mainly focused on rotational ellipsoid, while less research has been done on the arbitrary shape. To solve the above problems, we develop a model for constructing a arbitrarily shaped failure surface and ascertain the critical failure surface by the sliding direction (SD). To verify rationality of the introduced theory, the critical failure surfaces of two benchmark symmetric slopes and corresponding SFs are reanalyzed, and the results are compared with the reference solutions. Meanwhile, the results obtained by the proposed method are also consistent with the reference solutions for the complex slope with the asymmetric failure surface. The parametric analysis explores the relationships between the mechanical properties of soil and the SD as well as the SF. Furthermore, influence factors of the spatial characteristics of sliding mass are also revealed. The proposed method is used as a helpful complement to the existing methods.

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On the linear stability analysis of journal bearings – Consideration of coupled effects of anisotropic slip and surface roughness

Cited by 9 publications

References 27 publications

Effect of slip boundary condition and non-newtonian rheology of lubricants on the dynamic characteristics of finite hydrodynamic journal bearing

Effect of slip boundary condition and non-newtonian rheology of lubricants on the dynamic characteristics of finite hydrodynamic journal bearing

Mechanism of no-wear super-slip design of tribo-pair in load lifting and friction reduction

Identification of arbitrarily shaped critical 3D failure surface of a slope based on the sliding direction

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