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Performance Parameters

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Non-Circular Journal Bearings

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Abstract

There may be number of parameters which can be explained in relation to non-circular journal bearings. Some of them related to thermal view has been listed and defined in the current section.

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Abbreviations

b :

Width of bearing, mm

C :

Radial clearance, μm

C h :

Horizontal clearance for elliptical journal bearing, μm

C m :

Minimum clearance when journal centre is coincident with geometric centre of the bearing, μm

C P :

Specific heat of the lubricating oil, J/kg °C

ID:

Inner diameter of the offset-halves journal bearing, mm

D Imin :

Minimum inner diameter of the elliptical journal bearing, mm

D Imax :

Maximum inner diameter of the elliptical journal bearing, mm

° C:

Degree Celsius

e :

Eccentricity, m

E M :

Elliptical ratio

h c :

Convection heat transfer coefficient of bush, W/m °C

h :

Film thickness for offset-halves and elliptical journal bearing, mm

K oil :

Thermal conductivity of lubricating oil, W/m °C

K s :

Thermal conductivity of bearing, W/m °C

l :

Length of the bearing, m

n :

Number of iterations

N :

Journal speed, rpm

ofr :

Oil flow rate, lt/min

O B :

Bearing centre

O J :

Journal centre

O L :

Lower lobe centre

O U :

Upper lobe centre

OD:

Outer diameter of the bearings, mm

P :

Film pressure, Pa

P(i, j)iso :

Isothermal pressure, Pa

P(i, j)th :

Thermal pressure, Pa

PTPA:

Parabolic temperature profile approximation

R :

Radius of journal, mm

R j :

Radius of journal, mm

r :

Bush radius, mm

Rbi:

Inner bush radius, mm

R L :

Radius of lower lobe of the bearing, mm

R U :

Radius of upper lobe of the bearing, mm

RTD:

Resistance temperature detector

s :

Bearing surface

t :

Thickness of bearing, m

T :

Lubricating film temperature, °C

T a :

Ambient temperature, °C

T b :

Bush temperature, °C

T L :

Temperature of the lower bounding surface (journal), °C

T m :

Mean temperature across the film, °C

T o :

Oil inlet temperature, °C

T s :

Surface temperature, °C

T U :

Temperature of the upper bounding surface (bearing)

THD:

Thermohydrodynamic

u, w :

Velocity components in X- and Z-directions, m/s

u L :

Velocity of lower bounding surface, m/s

u U :

Velocity of upper bounding surface, m/s

U :

Velocity of journal, m/s

x, y, z :

Coordinates in circumferential, radial, and axial directions

φ :

Attitude angle

ϕ 1, ϕ 2 :

Attitude angles from 0 to 180° (upper lobe) and 180–360° (lowerlobe), respectively

α :

Barus viscosity-pressure index, Pa−1

γ :

Temperature-viscosity coefficient of lubricant, K−1

δ :

Offset factor (C m/C)

ε :

Eccentricity ratio

ε 1, ε 2 :

Eccentricity ratio from 0 to 180° (upper lobe) and 180–360° (lower lobe), respectively

θ :

Angle measured from the horizontal split axis in the direction of rotation

μ :

Absolute viscosity, Pa s

μ ref :

Absolute viscosity at oil inlet temperature, Pa s

ρ :

Density of lubricating oil, kg/m3

ω :

Angular velocity of shaft, rad/s

References

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Authors and Affiliations

  1. Panjab University, Chandigarh, India

    Amit Chauhan

Authors
  1. Amit Chauhan
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Chauhan, A. (2016). Performance Parameters. In: Non-Circular Journal Bearings. SpringerBriefs in Materials. Springer, Cham. https://doi.org/10.1007/978-3-319-27333-4_3

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