Closure to “Discussion of ‘Zero-Load Stability of Rotating Externally Pressurized Gas-Lubricated Journal Bearings’” (1970, ASME J. Lubr. Technol., 92, p. 334)

1970 ◽  
Vol 92 (2) ◽  
pp. 335-335
Author(s):  
David P. Fleming ◽  
R. E. Cunningham ◽  
W. J. Anderson
Keyword(s):  
Journal Bearings ◽  
Load Stability

Zero-Load Stability of Rotating Externally Pressurized Gas-Lubricated Journal Bearings

1970 ◽  
Vol 92 (2) ◽  
pp. 325-334 ◽  
Author(s):  
David P. Fleming ◽  
R. E. Cunningham ◽  
W. J. Anderson
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Digital Computer ◽  
Pressure Ratio ◽  
Journal Bearings ◽  
Small Eccentricity ◽  
Attitude Angle ◽  
Stability Data ◽  
Bearing Number ◽  
Load Stability

A small eccentricity analysis was performed for a bearing having two feeding planes, each of which is assumed to be a line source. Numerical results were obtained for a range of bearing number, pressure ratio, feeding parameter, and orifice recess volume by means of a digital computer. Steady-state load and attitude angle were obtained, as well as stability data. Stability decreased markedly with increasing recess volume; moreover, for large recess volume and low bearing number, an increase in pressure ratio decreased stability. There was no correlation between stability and steady-state attitude angle for any of the cases studied. Fair agreement was obtained with available experimental data.

Influence of textured journal bearings on rotor's dynamic behavior

2019 ◽  
Author(s):  
Leandro Ito Ramos ◽  
Douglas Jhon Ramos ◽  
Gregory Bregion Daniel
Keyword(s):  
Dynamic Behavior ◽  
Journal Bearings

Optimum Design of Journal Bearings Dimensions for Rotating Machines

2020 ◽  
Vol 38 (10A) ◽  
pp. 1481-1488
Author(s):  
Tariq M. Hammza ◽  
Ehab N. Abas ◽  
Nassear R. Hmoad
Keyword(s):  
Aspect Ratio ◽  
Dynamic Response ◽  
Numerical Solution ◽  
Critical Speed ◽  
Design Method ◽  
Considerable Effect ◽  
Journal Bearings ◽  
Rotating Machines ◽  
Bearing Clearance ◽  
Study Results

The values of Many parameters which involve in the design of fluid film journal bearings mainly depend on the bearing applied load when using the conventional design method to design the journal bearings, in this study, as well as applied bearing load, the dynamic response and critical speed have been used to calculate the dimensions of journal bearings. In the field of rotating machine, especially a heavy-duty rotating machines, the critical speed and response are the main parameters that specify bearing dimensions. The bearing aspect ratio (bearing length to bore diameter) and bearing clearance have been determined based on rotor maximum critical speed and minimum response displacement. The analytical solution of rotor Eq. of motion was verified by numerical solution via using ANSYS Mechanical APDL 18.0 and by comparing the numerical solution with the preceding study. The final study results clearly showed that the bearing aspect ratio has little effect on the critical speed, but it has a high effect on the dynamic response also the bearing clearance has little effect on the critical speed and considerable effect on the dynamic response. The study showed that the more accurate values of bearing aspect ratio to make the response of rotor as low as possible are about 0.65 - 1 and bearing percent clearance is about 0.15 - 0.2 for different rotor dimensions.

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