Approximate Analysis of Dynamic Characteristics of Short Journal Bearings in Turbulent Micropolar Lubrication

Rana, Narendra Kumar; Gautam, Satyam Shivam; Samanta, Sutanu

doi:10.1007/s40032-014-0147-8

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…All finite element equations are assembled together, to obtain global stiffness matrix and global force matrix. By adjusting trailing edge of the fluid film, Reynolds boundary condition as given in equations (5) to 7is being satisfied.…”

Section: Modified Reynolds Equationmentioning

confidence: 99%

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Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Sharma

Verma

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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A circular bearing experiences the instability problem due to oil whirl, causing violent vibrations at high speed. Two-lobe pressure dam bearing is a solution to the instability arising in high-speed rotating machineries. The paper presents the various static and dynamic characteristics of two-lobe pressure dam bearings, while operating with micropolar fluid. The modified Reynolds equation used to model the lubrication is solved using the finite element method. Performance characteristics such as load, attitude angle, critical mass, threshold speed and whirl frequency are computed, presented graphically and analysed. A detailed comparison of the performance characteristics is done for various micropolar and dam parameters. It is concluded that bearing performance is significantly influenced by dam parameters (dam angles) and micropolar parameters (coupling number and characteristics length).

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Section: Modified Reynolds Equationmentioning

confidence: 99%

“…They reported that higher turbulence and higher eccentricity ratio provide higher load capacity. Rana et al 5 presented a dynamic analysis of short journal bearings. They observed good variation in the value of whirl ratio at higher eccentricity ratio, while small variations were observed at lower eccentricity ratio.…”

Section: Introductionmentioning

confidence: 99%

Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Sharma

Verma

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Dynamic performance of short circular bearings in terms of critical mass, threshold speed, and whirling frequency was examined by Rana et al 14 They concluded that higher eccentricity suppresses the whirling tendency and increases the stability of the journal bearing system. Wang and Zhu 15 compared the static performance of circular bearings for various eccentricities and found that the micropolarity of a lubricant enhances the performance at higher eccentricity as compared with a Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic performances of an offset bearing under a micropolar lubricant

Sharma¹,

Krishna

2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this research paper, the theoretical performance of a circular offset bearing is evaluated. The objective of this paper is to discuss the effects of eccentricity ratios and micropolarity parameters on the static and dynamic characteristics of an offset bearing with respect to micropolar lubrication. The modified Reynolds' equation for a dynamic state is solved using the finite-element method and Galerkin technique. The performance of an offset bearing is computed for a chosen range of eccentricity ratios (0.4–0.6) and for a length–diameter ratio (2.4). Enhancement in the performance of a bearing system is achieved in terms of increasing load and decreasing whirling at the higher values of eccentricity and offset especially at higher micropolarity.

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“…It is only in early of this century when Constantinescu’s turbulent model was used by Faralli and Belfiore (2006) to analyze the steady-state characteristics of worn spherical bearing operating in turbulent regime. Rana et al (2014) analyzed linear dynamic characteristics of short journal bearings under turbulent micropolar lubrication. A very recent study on the stability of finite journal bearings under turbulent lubrication has been performed by Ghosh and Guha (2016) using the coupled stress fluid model.…”

Section: Introductionmentioning

confidence: 99%

Non-linear stability analysis of micropolar fluid lubricated journal bearings with turbulent effect

Das

Guha

2019

ILT

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Purpose The purpose of this paper is to investigate the effect of turbulence on the stability characteristics of finite hydrodynamic journal bearing lubricated with micropolar fluid. Design/methodology/approach The non-dimensional transient Reynolds equation has been solved to obtain the non-dimensional pressure field which in turn used to obtain the load carrying capacity of the bearing. The second-order equations of motion applicable for journal bearing system have been solved using fourth-order Runge–Kutta method to obtain the stability characteristics. Findings It has been observed that turbulence has adverse effect on stability and the whirl ratio at laminar flow condition has the lowest value. Practical implications The paper provides the stability characteristics of the finite journal bearing lubricated with micropolar fluid operating in turbulent regime which is very common in practical applications. Originality/value Non-linear stability analysis of micropolar fluid lubricated journal bearing operating in turbulent regime has not been reported in literatures so far. This paper is an effort to address the problem of non-linear stability of journal bearings under micropolar lubrication with turbulent effect. The results obtained provide useful information for designing the journal bearing system for high speed applications.

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Approximate Analysis of Dynamic Characteristics of Short Journal Bearings in Turbulent Micropolar Lubrication

Cited by 7 publications

References 14 publications

Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Performance characteristics of two-lobe pressure dam bearings with micropolar lubrication

Static and dynamic performances of an offset bearing under a micropolar lubricant

Non-linear stability analysis of micropolar fluid lubricated journal bearings with turbulent effect

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