conversion formulas

CPM = Hertz * 60 Hertz = CPM / 60

Where:
D = V (19100 / F) D = Displacement (mils, pk-pk)
V = Velocity (inch/second, peak)
D = A (8383 / F)² A = Acceleration (g, peak)
F = Frequency (cycles/MINUTE)
V = D (F / 19100)

FOR SINUSOIDAL VIBRATION

V = A (3687 / F) A = D (F / 8383)² A = V (F / 3687)

Where:
g = 0.0142 D (F / 1000)² OZ-IN = Unbalance (ounce-inch)
W = Weight of rotating element (lbs.)
OZ-IN = D (W / 125) C.F. = Centrifugal Force
R = Radius (feet)
OZ-IN = G ((0.563 W)/(RPM / 1000)²)

#FORCE = 1.79 OZ-IN (RPM / 1000)²

C.F. = W 0.00034 F² R

ORD frequency = n/2 RPM (1-(BD/PD)*cos(a)

IRD frequency = (n/2)*RPM*(1+(PD/BD)*cos(a)

RED frequency = (PD/BD)*(1-[(BD/PD)*cos(a)]²)

entek RED = (RPM/2)*(PD/BD)*(1-(BD/PD)²*(cos(a)²)

entek FTD frequency = (RPM/2)*[(1-(BD/PD)*cos(a)]

a = contact angle
n = number of rolling elements
PD = pitch diameter
BD = ball diameter

bearing frequency estimation equations

ORD = n * RPM * 0.4
IRD = n * RPM * 0.6
FTF = RPM * 0.4

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Last updated: November 24, 2002