Stability of a constant flow valve compensated multi‐recess conical hybrid journal bearing operating with micropolar lubricant

Rajput, Arvind K.; Sharma, Satish C.

doi:10.1002/ls.1264

Cited by 13 publications

(12 citation statements)

References 24 publications

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“…Sharma et al [4,5] theoretically analyzed the effect of wear on the characteristics of a 4 pocket hydrostatic/hybrid conical journal bearing system for different cone angles with different restrictors for different load arrangements. The analysis of multirecessed hybrid conical journal bearing with various restrictors have been carried out by Rajput and Sharma [6,7]. Dhawan and Verma [8] have studied non-circular hybrid journal bearings with micropolar fluid film lubricant.…”

Section: Introductionmentioning

confidence: 99%

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Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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This paper presents the theoretical analysis on the effect of two different load arrangements for a conical multirecess hybrid journal bearing. For this analysis constant flow valve restrictors are used under micropolar lubricant for different semi cone angles. The modified Reynolds equation using micropolar fluid flow on the conical surface has been solved with the use of FEM and Galerkin's technique applying proper boundary conditions in the iterative scheme. The study suggests that the configuration LA I can be a better alternative as compared to LA II for different semi-cone angles and external load in terms of bearing characteristics. Keywords CFV restrictor • Conical bearing • Micropolar lubrication • FEM List of symbols a b Axial bearing land width, mm A p Area of pocket, mm 2 A b Area of bearing, mm 2 A e Area of each element c Radial clearance, mm C ij Fluid film damping coefficients (N/mm 2), (i, j = x, z) D m Mean journal diameter of conical shaft, mm e Eccentricity, mm F Fluid film reaction F x , F z Fluid film reaction component, N h Fluid film thickness, mm l m ,l Bearing characteristic length L Bearing length, mm M Journal mass, kg p s Supply pressure, N/mm 2 Q Lubricant flow (mm 3 /s) R j Journal radius, mm r Radial coordinate S ij Fluid film stiffness coefficients (N/mm),

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Section: Introductionmentioning

confidence: 99%

“…The data charts presented here for multirecess hybrid bearings may be useful for the bearing designers as a guide for bearing performance. For conical surface using micropolar fluid the Reynolds equation in non-dimensional form is as follows [5][6][7]: where…”

Section: Introductionmentioning

confidence: 99%

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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“…Sharma and Rajput [7][8][9] have demonstrated the influence of micropolar lubricant on a 4 pocket conical hybrid journal bearing system compensated with different restrictors. Dhawan and Verma [10] have analyzed micropolar lubrication in non-circular hybrid journal bearings.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Effect of Recesses on Conical Hybrid Journal Bearing Compensated with CFV under Micropolar Fluid Lubrication

2016

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This paper theoretically presents the comparative performances of conical hybrid journal bearing with 4-pockets and 6-pockets compensated with constant flow valve (CFV) under micropolar fluid lubrication for various semi-cone angles. The numerical solution of the modified Reynolds equation for micropolar fluid flow on the conical surface has been done by using finite element method using Galerkin's technique along with the necessary boundary conditions and iterative scheme. The bearing performances have been presented for two different semi-cone angles, radial load and the restrictor design parameter. It is observed that bearing performances improve for 6-pockets CFV than 4-pockets. The bearing performances also increase with increase in semi-cone angle, constant flow valve restrictor and micropolar parameters significantly. With increase in semi-cone angle of bearing the direct stiffness, damping coefficients and the stability have been observed to increase under micropolar lubrication for 6-pockets CFV restrictors.

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“…This special issue of Lubrication Science contains papers from those presented at the 3rd International Tribology Symposium of IFToMM (ITS 2013) that were recommended by the organising committee of ITS 2013.…”

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confidence: 99%

“…Rajput and Sharma investigated the influence of micropolar lubrication on the stability of a constant flow valve compensated multi‐recess conical hybrid journal bearing system. They performed numerical simulations of the micropolar lubricated bearing system by means of a finite element discretisation of a Reynolds equation modified according to Eringen theory.…”

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confidence: 99%

Selected papers from those presented at the 3rd International Tribology Symposium of IFToMM

Almqvist

Hardell

Prakash

2014

Lubrication Science

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The International Federation for the Promotion of Mechanism and Machine Science (IFToMM) is an organisation aimed at promoting research and development in the field of machines and mechanisms by theoretical and experimental methods, along with their practical application. IFToMM has several technical committees in different fields, and one is dedicated to Tribology. The technical committee for tribology requests prominent research groups in tribology to host and organise an international symposium on tribology. The symposium was held in the Luleå University of Technology campus during three fantastic winter days, providing a perfect forum for the tribologists for presenting their latest research and exchange of ideas. The participants were also given the opportunity to experience the snowy landscape during a memorable outdoor dinner.The symposium attracted 146 participants from 26 countries. In all, 92 papers spread over 32 sessions (including six plenary sessions) were presented. These papers covered both the fundamental and applied aspects of wide ranging topics such as friction, wear, lubrication, lubricants, tribology in hostile environment, tribomaterials, solid lubricants, surface engineering, tribotesting, tribological design and optimisation of machine components, modelling in tribology, biotribology, micro/nanotribology, tribotronics, tribology in power generating systems, metal working tribology and tribology in rail and road transport. Two additional events were also organised in conjunction with the conference, a young researcher forum and the second international high temperature tribology workshop.This special issue of Lubrication Science contains papers 1-8 from those presented at the 3rd International Tribology Symposium of IFToMM (ITS 2013) that were recommended by the organising committee of ITS 2013.Zhmud et al. 1 introduced the triboconditioning process, which is a mechanochemical surface finishing technique developed for improving the tribological properties of mechanical components made of steel or cast iron. The process combines elements of extreme pressure mechanical burnishing of the component surface with a tribochemical deposition of a low-friction anti-wear film of tungsten disulphide (WS2).

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Stability of a constant flow valve compensated multi‐recess conical hybrid journal bearing operating with micropolar lubricant

Cited by 13 publications

References 24 publications

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

Comparative Study on the Effect of Recesses on Conical Hybrid Journal Bearing Compensated with CFV under Micropolar Fluid Lubrication

Selected papers from those presented at the 3rd International Tribology Symposium of IFToMM

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