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

Rana, Narendra Kumar; Gautam, Satyam Shivam; Verma, Suresh

doi:10.1007/s42452-019-0609-y

Cited by 7 publications

(9 citation statements)

References 15 publications

(19 reference statements)

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“…Rana et al (2014) theoretically studied conical journal bearing with CFV using micropolar fluid and noted that the bearing is much stable for larger pressure developed. Rana et al (2019) further extended their work and studied hybrid conical journal bearing for 90°and 45°loading configurations; Rana et al (2019) observed that 45°loading configuration is more suitable for minimum thickness of fluid film, bearing damping and stiffness. Khakse et al (2016) mainly compared the hydrostatic and hybrid mode of conical journal bearing using orifice and capillary compensators, and it is found that hydrostatic conical bearing provide good damping effect.…”

Section: Introductionmentioning

confidence: 94%

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Restrictor-based studies of hybrid hole-entry conical journal bearings

Khakse

Phalle²

2021

ILT

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Purpose This paper aims to describe how successfully a particular restrictor delivers its best in increasing the conical journal bearing performance. The restrictors are used in the hole-entry conical journal bearing subjected to hybrid mode. Thus, the restrictors, like constant flow valve (CFV), orifice and capillary, are studied comparatively. Design/methodology/approach Numerical simulation for the bearing results with the three restrictors are obtained by using finite element method (FEM) under the well-known modified Reynolds equation. Findings When the hole-entry conical journal bearings, with the restrictor design parameter range C¯s2 = 0.03 – 0.09, are operated, the results obtained are quite distinctive and significant. It indicates that the CFV restrictor-based conical bearing gives enhanced performance in comparison to orifice and capillary restrictors. Moreover, it suggests the performance-wise sequence of the restrictors in hybrid bearings as CFV > Orifice > Capillary. Originality/value The outcome of the research paper will give insight to help the bearing designer to choose the particular restrictor in hybrid conical bearing depending on the industrial need.

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Section: Introductionmentioning

confidence: 94%

“…Galerkin's technique is used to obtain elemental equation as below: ðð A e N i R e dadb ¼ 0 (5) Solution to equation ( 5) gives rise to below equation for an element (Sharma and Rajput, 2012;Rana et al, 2019):…”

Section: Fem Formulationmentioning

confidence: 99%

Restrictor-based studies of hybrid hole-entry conical journal bearings

Khakse

Phalle²

2021

ILT

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“…Hence, it could be estimated using Eq. [9]. This mathematical model is known as the Krieger-Dougherty model and it depends on the size and volumetric ratio of the nanoparticle.…”

Section: Viscosity Model Of the Lubricant With Nanoparticle Additivementioning

confidence: 99%

“…In literature, a lot of researchers have investigated the performance properties of the hydrostatic journal bearing with Newtonian fluid in detail [5][6][7][8][9][10][11][12][13]. In these studies, effects of the bearing geometry [5][6][7] and structure of the orifice [8][9][10] on the static and dynamic characteristics of the bearing, as well as stability conditions of the hydrostatic journal bearing-shaft system [11][12][13] were theoretically and experimentally studied. In the hydrostatic bearing-rotor system, when the rotor operates at a high rotational speed, friction occurs between the layer of the lubricant film during the fluid flow and the friction leads to increase the temperature of the lubricant and decrease viscosity.…”

Section: Introductionmentioning

confidence: 99%

Nanoparçacık katkılı yağlayıcı akışkanın radyal hidrostatik yatağın yük taşıma kapasitesine etkisi

Dal¹,

Kılıç²,

Akyüz³

et al. 2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Hydrostatic journal bearings are recommended for supporting shafts operating at high speeds and under heavy loads in the industry. In the journal bearings, lubricant viscosity decreases with increasing temperature at high rotation speeds and hence, the fluid between the surfaces should be circulated using a pump to cool the lubricant. However, the lubricant supplying between the surfaces at the high flow rate causes the whirl instability and vibrations problems in the bearing-shaft system. These instability problems give rise to significant damage on the system during operating at the high speeds and under heavy loads. As a solution to this problem, it could be suggested to control the variation of the lubricant viscosity concerning the temperature by adding nanoparticle. In the present work, the effects of the lubricant with nanoparticle additives on the load carrying capacity of a hydrostatic journal bearing are theoretically investigated. The fluid film flow between the bearing and rotor surfaces are modelled with Reynolds equation and the viscosity term in Reynold's equation is defined as a function which depends on the nanoparticle properties. Then, the pressure distribution is obtained with solving the film flow equation and the load capacity is calculated for different nanoparticle parameters using this pressure distribution. The results show that the usage of the lubricant with nanoparticle increases the load performance of the hydrostatic journal bearing and the influences of the nanoparticle size on the load performance is more dominant for high volumetric ratio.

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“…Rajput and Sharma (2013) presented the effect of micropolar lubricant on four-cavity conical hybrid bearing system via micropolar fluid theory and Galerkin method. Rana et al (2019) detailed dynamic characteristics and stability of a conical hybrid journal bearing for two different load arrangements. By comparing the textures of different shapes and sizes, Charitopoulos et al (2013) found manufacturing errors have different improvements in the lubrication performance of textured thrust bearing.…”

Section: Introductionmentioning

confidence: 99%

Thermal effect on stability and minimum oil film thickness of a deep/shallow pockets conical bearing

Gao

Yang

et al. 2020

ILT

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Purpose This paper aims to study the influence of thermal effect on the performance for a high-speed conical hybrid bearing including stability and minimum oil film thickness. Design/methodology/approach A thermal hydrodynamic (THD) model and dynamic model of single mass rigid rotor system were established by taking conical hybrid bearing with shallow and deep pockets as the research object, dynamic coefficient and stability parameters of bearing-rotor system were obtained by using finite element method (FEM) and finite difference method (FDM) to solve computational models of Reynolds equation, energy equation and viscosity-temperature equation. Minimum oil film thickness was obtained based on bearing force balance. Dynamic coefficient was compared with previous findings. Findings After considering thermal effect, the dimensionless critical mass decreases, a significant decrease in the instability speed, and the stability of the system decreases greatly; the minimum oil film thickness decreases because of thermal effect. Originality/value The thermal effect is combined with dynamic characteristics to analyze stability of the rotor system for a conical hybrid bearing. Influence of thermal effect on minimum oil film thickness is studied. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-12-2019-0542/

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

Cited by 7 publications

References 15 publications

Restrictor-based studies of hybrid hole-entry conical journal bearings

Restrictor-based studies of hybrid hole-entry conical journal bearings

Nanoparçacık katkılı yağlayıcı akışkanın radyal hidrostatik yatağın yük taşıma kapasitesine etkisi

Thermal effect on stability and minimum oil film thickness of a deep/shallow pockets conical bearing

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