Performance Characteristics of Finite Width Journal Bearings Under the Separation Boundary Condition

1986 ◽  
Vol 108 (2) ◽  
pp. 178-183 ◽  
Author(s):  
M. Nakai ◽  
T. Kazamaki ◽  
T. Hatake
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Performance Characteristics ◽  
Experimental Results ◽  
Finite Width ◽  
Separation Boundary ◽  
Physical Consideration ◽  
Calculation Results

The separation boundary condition is considered to be comparatively exact in the physical consideration of the supposition. The calculated performance characteristics applied to infinite width journal bearings are related to experimental results to some extent. However, performance characteristics applied to finite width journal bearings, which might be able to explain the experimental results more precisely, have been unknown. The present paper describes the application of the separation boundary condition to finite width journal bearings, and calculation results of some performance characteristics. The results are related to well-known experimental results in several respects.

On the Separation Boundary Condition for Fluid Lubrication Theories of Journal Bearings

1968 ◽  
Vol 11 (3) ◽  
pp. 196-203 ◽  
Author(s):  
Haruo Mori ◽  
Hiroshi Yabe ◽  
Yoshio Fujita
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Separation Boundary

A Fast Method for Calculating Dynamic Coefficients of Finite Width Journal Bearings With Quasi Reynolds Boundary Condition

1988 ◽  
Vol 110 (3) ◽  
pp. 387-393 ◽  
Author(s):  
T. Kato ◽  
Y. Hori
Keyword(s):  
Boundary Condition ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Boundary Line ◽  
Finite Width ◽  
Fast Method ◽  
Dynamic Coefficients ◽  
Straight Line ◽  
Time Required ◽  
Stiffness And Damping

This paper presents a fast method for calculating the dynamic coefficients of the finite width journal bearings under quasi Reynolds boundary condition in which the trailing boundary line is given by a straight line and the continuity of bulk flow across this line is ensured. Calculated linear stiffness and damping coefficients agree well with the data of Lund and Thomsen [1]. The time required by this calculation with HITAC M682H is only 0.1–0.3 seconds (about 1/100 of the time required by the ordinary FDM), which suggests the possibility of real time journal bearing designs without using the database of the dynamic coefficients.

scholarly journals Research on Discontinuity of Lubricant Film in Journal Bearings : 2nd Report, Separation Boundary Condition

1969 ◽  
Vol 35 (272) ◽  
pp. 899-906 ◽  
Author(s):  
Haruo MORI ◽  
Hiroshi YABE ◽  
Yoshio FUJITA ◽  
Yasutaka IIO ◽  
Yushiro OKUMOTO
Keyword(s):  
Boundary Condition ◽  
Journal Bearings ◽  
Lubricant Film ◽  
Separation Boundary

On the Steady-State Performance of Isotropically Rough Porous Hydrodynamic Journal Bearings of Finite Width with Slip-Flow Effect

2005 ◽  
Vol 219 (11) ◽  
pp. 1249-1267 ◽  
Author(s):  
R Haque ◽  
S K Guha
Keyword(s):  
Steady State ◽  
Load Capacity ◽  
Practical Importance ◽  
Slip Flow ◽  
Type Equation ◽  
Journal Bearings ◽  
Performance Characteristics ◽  
Finite Width ◽  
Static Performance ◽  
Steady State Performance

The objective of the present article is to theoretically investigate the static performance characteristics of rough porous hydrodynamic journal bearings of finite width with the effect of slip flow at the porous-film interface on the basis of the Beavers-Joseph criterion. In the analysis, the roughness is uniformly distributed over the bearing surfaces, with no preferred position or direction in the surface. With the concept of a stochastic process for the isotropic roughness patterns, the steady-state performance characteristics in terms of load capacity, end flowrate, and frictional parameters are obtained at different parameters of practical importance by solving simultaneously the continuity equation of flow in the porous bush and the Reynolds-type equation using the finite difference techniques. According to the results obtained, this analysis reveals that the influence of roughness on the steady-state performance of the journal bearing is physically apparent and not negligible.

Static Performance Characteristics of Finite-Width Turbulent Journal Bearings with THD Effect

2012 ◽  
Vol 55 (3) ◽  
pp. 302-312 ◽  
Author(s):  
Shiuh-Hwa Shyu ◽  
Wei-Ren Lee ◽  
Sheng-Jii Hsieh ◽  
Shen-Min Liang
Keyword(s):  
Journal Bearings ◽  
Performance Characteristics ◽  
Finite Width ◽  
Static Performance

Optimization of a Specimen Size for the Determination of the Diffusible Hydrogen Content in Metals

2014 ◽  
Vol 698 ◽  
pp. 466-471
Author(s):  
Oleg V. Panchenko ◽  
Alexey M. Levchenko ◽  
Victor A. Karkhin
Keyword(s):  
Hydrogen Content ◽  
Calculation Method ◽  
Specimen Size ◽  
Experimental Results ◽  
Diffusible Hydrogen ◽  
Measuring Methods ◽  
Deposited Metal ◽  
Calculation Results

Specimens of various sizes are used to determine hydrogen content in deposited metals in such standards as ISO 3690, AWS A 4.3, and GOST 23338 while measuring methods are the same. It causes problems in comparison of experimental results and brings up the following question: what kind of specimen size is optimal to determine hydrogen content? An optimal specimen size was estimated using a calculation method. Experimental and calculation results obtained by using specimens with estimated dimensions were compared to the results obtained by using the specimen with dimensions of 100*25*8 mm to determine hydrogen content in a deposited metal.

Theoretical Condition for the Cxy=Cyx Relation in Fluid Film Journal Bearings

1989 ◽  
Vol 111 (3) ◽  
pp. 426-429 ◽  
Author(s):  
T. Kato ◽  
Y. Hori
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Fluid Film ◽  
Finite Width ◽  
Damping Coefficients ◽  
Dynamic Coefficients ◽  
Cross Terms ◽  
Linear Damping ◽  
Theoretical Condition

A computer program for calculating dynamic coefficients of journal bearings is necessary in designing fluid film journal bearings and an accuracy of the program is sometimes checked by the relation that the cross terms of linear damping coefficients of journal bearings are equal to each other, namely “Cxy = Cyx”. However, the condition for this relation has not been clear. This paper shows that the relation “Cxy = Cyx” holds in any type of finite width journal bearing when these are calculated under the following condition: (I) The governing Reynolds equation is linear in pressure or regarded as linear in numerical calculations; (II) Film thickness is given by h = c (1 + κcosθ); and (III) Boundary condition is homogeneous such as p=0 or dp/dn=0, where n denotes a normal to the boundary.

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