Vibration Control in Rotating Machinery by the use of Accumulators or Aerated Lubricants

Roach, M. P.; Goodwin, Mike

doi:10.1007/978-1-4471-1979-1_46

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…The method is also described by Roach and Goodwin [7]. This method tended to result in relatively large air bubbles being created however, and these tended not to readily remain in suspension, and it was not easy to control their size.…”

Section: A Novel Technique For Aerating the Oil And For Measuring Levmentioning

confidence: 99%

“…Experimental measurements of the effect of aeration on oil viscosity were reported by Calderwood et al [5] and by Hayward [6], showing that viscosity increases with increasing bubble density. Roach and Goodwin [7] reported observations of increased stability of a journal bearing when aerated oil was used as the lubricant. Then in 1997 An et al [8] measured a slight decrease in load capacity when aerated oil was used with a journal bearing, and later Diaz and San Andres [9] observed an increase in damping when aerated oil was used to lubricate squeeze-film damper bearings.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and experimental investigation of the effect of oil aeration on the load-carrying capacity of a hydrodynamic journal bearing

Goodwin

Dong

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part J:

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It is widely assumed that the presence of air bubbles in the lubricating oil of a hydrodynamic bearing gives rise to a reduced load-carrying capacity, because of the high compressibility and low viscosity of the air and its tendency, therefore, to upset the hydrodynamic effect. The aim of the work described in the current paper was to investigate the accuracy of this assumption by theoretical and experimental means, and also to provide quantitative data relating to the concentration of air bubbles and their size that are required for any discernible effect.The paper has the following three main contributions: (a) a theoretical model based on Reynolds equation, but modified to allow for the effect of aeration on lubricant viscosity and density, is proposed; (b) a novel method of injecting air bubbles into lubricating oil and for measuring their size and concentration was developed; and (c) an experimental hydrodynamic bearing test rig was implemented and run with both aerated and non-aerated lubricating oil, and in each case measurements of the load-carrying capacity for various operating speeds were made.The results from both theoretical and experiment work show that the presence of air bubbles in the lubricating oil leads to a slight decrease in bearing load-carrying capacity at high operating speeds. For normal operating speeds, however, (i.e. those resulting in eccentricity ratios greater than 0.6) results show that the presence of air bubbles has little effect on bearing load-carrying capacity.

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Section: A Novel Technique For Aerating the Oil And For Measuring Levmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental investigation of the effect of oil aeration on the load-carrying capacity of a hydrodynamic journal bearing

Goodwin

Dong

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part J:

Self Cite

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“…Under a non-equilibrium boundary condition, where two-phase flow is present throughout the bearing geometry, it was found that under moderate loading conditions the two-phase fluid film would provide adequate support for the applied load while also reducing eccentricity and friction due to the compressibility of the gas. Roach and Goodwin [89] studied vibration control experimentally using aerated lubricants on a journal bearing test rig. Their results showed that stability can be increased by these lubricants due to reduced bearing stiffness.…”

Section: Gas-expanded Lubricant Performance and Effects On Rotor Stabmentioning

confidence: 99%

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

Weaver¹

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A lubrication model for bubbly oil lubrication with interfacial effect and thermal effect using the theory of multiphase mixtures

Li,

Lin,

Jiang

2023

Friction

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Bubbly oil lubrication is a type of lubrication method. However, the lubrication model of the bubbly oil has not been thoroughly considered. This paper aims to investigate the modelling for bubbly oil lubrication considering the interfacial effect and thermal effect, and a theoretical model is established based on the theory of multiphase mixtures. The interfacial and thermal effects on the static characteristics of a thrust bearing are analyzed. A test rig for the thrust bearing is developed to measure the static characteristics of the bearing under bubbly oil lubrication. The results show that the bearing static characteristics, i.e. bearing temperature rise, film thickness, friction torque, and volume flow, increase with consideration of three interfacial effects; the bearing temperature rise increases but the film thickness, friction torque, and volume flow rate decrease with consideration of the three thermal effects; the thermal effect on the bearing static characteristics is greater than the interfacial effect.

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Vibration Control in Rotating Machinery by the use of Accumulators or Aerated Lubricants

Cited by 5 publications

References 9 publications

Theoretical and experimental investigation of the effect of oil aeration on the load-carrying capacity of a hydrodynamic journal bearing

Theoretical and experimental investigation of the effect of oil aeration on the load-carrying capacity of a hydrodynamic journal bearing

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

A lubrication model for bubbly oil lubrication with interfacial effect and thermal effect using the theory of multiphase mixtures

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