Closure to “Discussions of ‘An Approximate Theoretical Analysis of the Static and Dynamic Characteristics of the Herringbone Grooved, Gas Lubricated Journal Bearing, and Comparison With Experiment’” (1969, ASME J. Lubr. Technol., 91, pp. 34–35)

This paper presents the analysis of a partial porous journal bearing for its static and dynamic characteristics. Tangential velocity slip at the interface of the fluid film and the porous medium has been taken into account. The analysis is general and can be easily adapted to plane journal and non-circular bearing configurations. The results reported in the paper are for centrally loaded 120 degree partial bearings of aspect ratio equal to unity. These results include static as well as dynamic characteristics of the bearing. A wide range of permeability parameter and R/C ratio has been covered making the data quite comprehensive for design purposes.

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Static and Dynamic Characteristics of Self-Acting, Partial-Arc, Gas Journal Bearings

Journal of Basic Engineering ◽

10.1115/1.3653089 ◽

1964 ◽

Vol 86 (2) ◽

pp. 405-413 ◽

Cited By ~ 1

Author(s):

R. J. Wernick ◽

C. H. T. Pan

Keyword(s):

Power Series ◽

Dynamic Characteristics ◽

Reynolds Equation ◽

Journal Bearing ◽

Standard Form ◽

Journal Bearings ◽

Static And Dynamic Characteristics ◽

Stability Derivatives ◽

Bearing Loads ◽

Gas Journal Bearing

The Reynolds equation applicable to a self-acting partial-arc gas journal bearing is perturbed in terms of the compressibility number Λ. The resulting set of equations is then put into a standard form and Galerkin’s method is used to obtain bearing loads and stability derivatives. These results are expressed in a power series in Λ.

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Performance of textured foil journal bearing considering the influence of relative texture depth

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/13506501211072991 ◽

2022 ◽

pp. 135065012110729

Author(s):

Guanghui Zhang ◽

Kefan Xu ◽

Jiazhen Han ◽

Yanzhong Huang ◽

Wenjie Gong ◽

...

Keyword(s):

Iterative Method ◽

Dynamic Characteristics ◽

Reynolds Equation ◽

Journal Bearing ◽

Load Capacity ◽

Surface Texturing ◽

Static And Dynamic Characteristics ◽

Foil Bearing ◽

Newton Raphson ◽

Maximum Increment

Both foil structure and surface texturing have been widely used to improve bearing performance. However, there is little research on their combination, namely, textured gas foil bearing. This paper adopts the Reynolds equation as the pressure governing equation of bump-type foil journal bearing to study the influence of textures located on the top foil. The Newton-Raphson iterative method and the perturbation method are employed to obtain static and dynamic characteristics, respectively. Thereafter, based on three texture distribution types, further analysis about the effect of the relative texture depth and the textured portion is carried out. The results indicate that an appropriate arrangement of textures could improve the performance of gas foil bearing. For #1 texture distribution, the maximum increment of load capacity could exceed 10% when ω = 1.4 × 105 r/min, ε = 0.2.

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Research on the Static and Dynamic Characteristics of Misaligned Journal Bearing Considering the Turbulent and Thermohydrodynamic Effects

Journal of Tribology ◽

10.1115/1.4029333 ◽

2015 ◽

Vol 137 (2) ◽

Cited By ~ 22

Author(s):

Guohui Xu ◽

Jian Zhou ◽

Haipeng Geng ◽

Mingjian Lu ◽

Lihua Yang ◽

...

Keyword(s):

Film Thickness ◽

Dynamic Characteristics ◽

Journal Bearing ◽

Journal Bearings ◽

Static And Dynamic Characteristics ◽

Oil Film ◽

Stiffness And Damping ◽

Film Stiffness ◽

Journal Misalignment ◽

Oil Film Pressure

Journal misalignment usually exists in journal bearings that affect nearly all the bearings static and dynamic characteristics including minimum oil film thickness, maximum oil film pressure, maximum oil film temperature, oil film stiffness, and damping. The main point in this study is to provide a comprehensive analysis on the oil film pressure, oil film temperature, oil film thickness, load-carrying capacity, oil film stiffness, and damping of journal bearing with different misalignment ratios and appropriately considering the turbulent and thermo effects based on solving the generalized Reynolds equation and energy equation. The results indicate that the oil thermo effects have a significant effect on the lubrication of misaligned journal bearings under large eccentricity ratio. The turbulent will obviously affect the lubrication of misaligned journal bearings when the eccentricity or misalignment ratio is large. In the present design of the journal bearing, the load and speed become higher and higher, and the eccentricity and misalignment ratio are usually large in the operating conditions. Therefore, it is necessary to take the effects of journal misalignment, turbulent, and thermal effect into account in the design and analysis of journal bearings.

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