Page 40 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Rotating Machinery: Practical Solutions

Figure 2-7. Maximum Velocity and Maximum Acceleration in a Sine
Wave

If the capital letter F stands for the frequency in cycles per minute,
then:

F = f * 60 (2.8)
and:
f = F/60 (2.9)

Letting the capital letter D stand for the peak-to-peak displace-
ment in mils, then:

D = 2 × X (2.10)
o
and:
X = D/2 [D in mils] (2.11)
o

X = (.001 D)/2 [D in inches] (2.12)
o
It now follows that the relation between the maximum veloc-
ity and the peak-to-peak displacement can be expressed by the
following equations:

V = X ω
max o

V= .001*D 2°F (inches per second) (2.13)
×
2 60