Wave Journal Bearing with Compressible Lubricant—Part I: The Wave Bearing Concept and a Comparison to the Plain Circular Bearing

Dimofte, Florin

doi:10.1080/10402009508983391

Cited by 63 publications

(26 citation statements)

References 9 publications

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“…To improve the static and dynamic characteristics of hydrodynamic journal bearings, many researchers have resorted to non-circular geometries. [7][8][9][10][11][12][13] It is well reported in the literature and has been found to be better as compared to circular geometry. Soni et al 7 have studied two-lobe bearing geometry and solved the modifi ed Reynolds equation using fi nite element theory.…”

Section: Introductionsupporting

confidence: 53%

“…For circular or wave journal bearings equations (8) to (12) must satisfy the boundary conditions at two bearing ends and also the periodic condition must be satisfi ed: …”

Section: Derivations Of Governing Equationsmentioning

confidence: 99%

“…This bearing feature waved inner bearing diameter and allows the shaft to rotate in either direction. Dimofte 8 has studied a three-wave bearing geometry operating with a compressible lubricant. Hargreaves 10 has studied on load-carrying capacity of rectangular slider bearings for tapered axial wave geometry.…”

Section: Introductionmentioning

confidence: 99%

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Static and dynamic characteristics of short wavy journal bearings

Meena

Gautam

Ghosh

2010

Lubrication Science

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A general analysis has been done to investigate the static and dynamic performance of short wavy journal bearing. Reynolds equation is solved for both steady-and unsteady-state operations. The steady-state analysis has been done and compared with circular bearing with respect to their load capacity, fl ow rate, pressure distribution and friction factor. The unsteady-state analysis has been used to determine the rotor dynamic coeffi cients for various eccentricity ratios. These coeffi cients are used to determine the stability parameters, such as critical mass and whirl ratio, and prove that wave bearing has not only better load carrying capacity but also provides better stability at high speed than circular bearing.

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Section: Introductionsupporting

confidence: 53%

“…For circular or wave journal bearings equations (8) to (12) must satisfy the boundary conditions at two bearing ends and also the periodic condition must be satisfi ed: …”

Section: Derivations Of Governing Equationsmentioning

confidence: 99%

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Static and dynamic characteristics of short wavy journal bearings

Meena

Gautam

Ghosh

2010

Lubrication Science

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“…Since the tests were run at 70°F Kmeas should be temperature adjusted when operated at an isothermal temperature other than 70°F (T) to: 1995 - [46], [47] Dimofte -The wave bearing concept, which is a slightly out of round 3-lobed hydrodynamic bearing, is analyzed and compared to a cylindrical journal bearing. A wave bearing with a groove is compared against a lobe bearing.…”

Section: A24 Change In Mass In the Finite Elementmentioning

confidence: 99%

Characterization and Measurement of Hybrid Gas Journal Bearings

Lawrence

Kemple

Fant

2013

Volume 1A, Symposia: Advances in Fluids Engineering Education; Advances in Numerical Modeling for Turbomachinery Flow Optimizat

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This paper concentrates on the study of hybrid gas journal bearings (bearings with externally pressurized mass addition). It differs from most work in that it goes back to “basics” to explore the hydrodynamic phenomena in the bearing gap. This work compares geometrically identical bearings with 2 configurations of external pressurization, porous liners where mass-addition compensation is varied by varying the liner’s permeability, and bushings with 2 rows of 6 feedholes where the mass-addition compensation is varied by the feedhole diameter. Experimentally, prototype bearings with mass-addition compensation that spans 2 orders of magnitude with differing clearances are built and their aerostatic properties and mass addition characteristics are tested. A dimensionless time and mass compensation constant are suggested that are thought to be more ontologically meaningful for presenting extendible results. The findings indicate that the defined maximum achievable static bearing efficiency, over 2 orders of magnitude of mass addition compensation, is almost entirely determined by the bearing geometry and external pressurization configuration so long as the clearance is tuned to the mass compensation (larger mass compensation requires larger clearance). A “near surface effect” is discovered in feedhole bearings leading to a region of negative stiffness. This is analyzed by dissecting the pressure waves in the bearing gap and is attributed to the pressure plume emanating from the feedholes nearest the minimum bearing gap height.

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“…The wave journal bearing unlike plain circular journal bearing can be represented by a waved bush or sleeve wrapped around the shaft. Its performance in comparison to circular and other noncircular bearings was later investigated by Dimofte 15,16) in compressible lubrication and it was shown that wave geometry improves static and dynamic performance.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Static Characteristics of Wavy Annular Seals in Turbulent Flow

Gautam

Ghosh

2010

Tribology Online

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This paper presents results of a theoretical analysis to determine the leakage flow and dynamic characteristics of circumferential wave geometry annular seals using turbulent lubrication theory. Turbulent lubrication equations based on an eddy viscosity model have been used to develop the turbulent Reynolds equation. Convective fluid inertia effects have been incorporated using the perturbation approach in turbulent lubrication. To determine the dynamic characteristics i.e. stiffness, damping and whirl ratio, perturbation theory for small amplitude vibration of the journal center has been adopted. In general, it has been found that circumferential wave geometry improves the performance of the annular seal at higher speeds and increases in the L/D and taper ratios.

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Wave Journal Bearing with Compressible Lubricant—Part I: The Wave Bearing Concept and a Comparison to the Plain Circular Bearing

Cited by 63 publications

References 9 publications

Static and dynamic characteristics of short wavy journal bearings

Static and dynamic characteristics of short wavy journal bearings

Characterization and Measurement of Hybrid Gas Journal Bearings

Dynamic and Static Characteristics of Wavy Annular Seals in Turbulent Flow

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