Unbalance
- Usually the simplest problem to diagnose (and one of the most common).
Unbalance is a centrifugal force. Consider the following about a 3 foot
(0.91 meter) diameter fan rotating at 2000 rpm:
-
Circumference
= 3 x 3.14 = 9.42 feet (2.87m).
-
2000 rpm = 120,000
rev/hour (rph)
-
120,000 rph x
9.42 ft/rev = 1,130,400 ft/hour (344,546 m/hour)
-
1,130,400 ft/hr
/ 5280 ft/mile = 214.1 mph OR 344.6 km/hr
An unbalance mass
(whatever that mass is) at the rim of the fan is travelling close
to the top speed of an Indy race car. In addition to that, remember that:
-
Force = Mass x
Velocity squared
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