Lubrication Flashcards

1
Q

Kinematic Visc

A

ν = μ / ρ

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2
Q

Dynamic Visc

A

μ = (F / A) / (U / h)

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3
Q

Abs. viscosity @ given P

A

μ p = μK * exp(Υ*P)

μK - abs visc at atm pressure
Y - (gamma) pressure coefficient of viscosity
P - applied pressure

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4
Q

Load capacity in journal bearing

A

P = W / (LD)

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5
Q

Bearing parameter journal bearing

A

μ N / P

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6
Q

PV factor

A

P * V

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7
Q

Friction force #1, journal

A

F = (μ A U) / h

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8
Q

Contact area, journal bearing

A

Area = 2pi R L

or

Area = pi D L

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9
Q

Velocity, journal bearing

A

V = 2pi R n

or

V = pi D n

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10
Q

Height is equivalent to …. in journal bearings

A

radial clearance, c

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11
Q

Radial clearance, journal

A

c = (bearing diam. - shaft diam.) / 2

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12
Q

Friction force #2, journal

A

F = Tf / R

Tf is friction torque

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13
Q

Tf in friction force eqs, journal

A

Tf = (4(pi)^2 μ n R^3 L) / c

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14
Q

Clearance ratio, journal

A

R / c

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15
Q

Coefficient of friction, Petroff’s eqs, journal

A

f = 2(pi)^2 (μ n / P) (R / c)

aka f = 2(pi)^2 * (bearing parameter) * (clearance ratio)

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16
Q

Alt. friction torque eqs, journal

A

Tf = f W R = f (D L P) R

17
Q

Epsilon symbol is for

A

eccentricity ratio

18
Q

Power, journal

A

P = ω T = 2pi Ns T