Effect of support stiffness and damping on stability characteristics of herringbone-grooved aerodynamic journal bearings mounted on viscoelastic supports

Miyanaga, Norifumi; Tomioka, Jun

doi:10.1016/j.triboint.2016.01.019

Cited by 23 publications

(13 citation statements)

References 22 publications

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“…Typically, hydrodynamic lubrication analysis was based on the classical or modified Reynolds equation (Sun et al, 2012;Wang et al, 2014;Miyanaga and Tomioka, 2016). Cavitation disrupted the continuous lubrication phase because of the existence of gas or vapor or both.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Zhang

Wang

et al. 2019

ILT

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Purpose The growing demand of efficiency and economy has led to a dramatic increase of the operating speed of the journal bearing, with a higher temperature distribution. This paper aims to investigate the three-dimensional temperature distribution of journal bearings. Design/methodology/approach A thermo-hydrodynamic lubrication model of a journal bearing was established based on the full 3D CFD method. A two-sided wall was used to include the conjugate heat transfer effect. The temperature-dependent characteristics of lubrication and cavitation impact were also included. The simulation results well agreed with the experimental results. Based on this method, the three-dimensional temperature distribution was analyzed under different operating conditions. Findings The temperature distribution in the radial direction had a difference. An increase of speed and de-crease of inlet temperature promoted temperature differences in the higher temperature zone and the increasing temperature zone, respectively. However, the inlet pressure had less influence on these differences. The temperature distribution was basically the same at a lower bearing conductivity. As the conductivity increased, the radial temperature difference was increased. Originality/value The temperature distribution in the radial direction was found under different operating conditions, and the present research provides references to understand the three-dimensional temperature distribution of journal bearings.

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Section: Introductionmentioning

confidence: 99%

Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Zhang

Wang

et al. 2019

ILT

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“…To begin the test, the lower specimen was placed on the Peltier device and submerged in lubrication oil. The shaft with the glass plate was attached to a spindle, and the film thickness was fixed at a constant value of 30 µm, basing on the consideration of that almost same film thickness with groove/dimple depth show better bearing performance [5,16].…”

Section: Methodsmentioning

confidence: 99%

“…Applying dimples and/or grooves to the lubricating area is an effective method for improving lubrication performance [1]. Consequently, this technology is being used in various mechanical elements such as bearings [2][3][4][5], seals [6][7][8], and piston rings [9,10].…”

Section: Introductionmentioning

confidence: 99%

Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples

2021

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This paper described unique hysteresis phenomena that appear in the hydrodynamic lubrication properties of dimpled thrust bearings. A seal-type thrust bearing specimen was textured with dimples. The load-carrying capacity and frictional torque were measured with a constant film thickness and compared to those of a dimple-free specimen. For examining the size of cavitation bubbles that occurred in various conditions, the lubricating area was observed during experiments. The used dimpled specimen produced the load-carrying capacity, and it exhibited an interesting hysteresis phenomenon, the difference in the values in the increasing and decreasing processes of rotational speed. The visualization test results revealed that the size of cavitation bubbles occurring within the dimples strongly affected this phenomenon. In addition, the dimpled specimen was able to reduce the frictional torque compared to the dimple-free specimen. However, the frictional torque did not show the hysteresis loop similar to that shown in the load-carrying capacity.

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“…Many research papers were published on performance investigations of herringbone grooved bearings. A narrow groove theory (NGT) was introduced to analyze the spiral groove aerodynamic bearings, 5–10 which assumed that the number of grooves approached infinity. The NGT neglected the saw-toothed ripples in the actual pressure distribution and conceived an approximate smoothed overall pressure distribution around the journal.…”

Section: Introductionmentioning

confidence: 99%

Investigation on influences of herringbone grooves for the aerostatic journal bearings applied to ultra-high-speed spindles

Gao

Shi

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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Aerostatic bearings are the core parts of ultra-high-speed spindles with maximum running speed greater than 100,000 r/min. In this paper, the influences of herringbone grooves on the performance of aerostatic journal bearings are studied to design spindles with the features of higher precision and higher speed. Parametric studies and sensitivity analyses are executed in terms of the improved finite element method, which is specially developed to solve the compressible Reynolds equation for herringbone grooved air bearings. The calculated results indicate that herringbone grooves significantly improve the performance of aerostatic journal bearings under the conditions of ultra-high speeds and low supply pressures. Groove parameters are nonlinear dependent, and groove depth and length are the dominant influential factors for the load capacity at speed of 200,000 r/min. Experiments are designed and conducted to verify the improved finite element method, which show that the improved finite element method can be used to analyze the influences of herringbone grooves on aerostatic journal bearings and also manifest that suitable herringbone groove geometrical parameters can obviously decrease spindle radial runouts at ultra-high speeds.

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Effect of support stiffness and damping on stability characteristics of herringbone-grooved aerodynamic journal bearings mounted on viscoelastic supports

Cited by 23 publications

References 22 publications

Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Investigations of the three-dimensional temperature field of journal bearings considering conjugate heat transfer and cavitation

Appearance of Hysteresis Phenomena on Hydrodynamic Lubrication in a Seal-Type Thrust Bearing with Dimples

Investigation on influences of herringbone grooves for the aerostatic journal bearings applied to ultra-high-speed spindles

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