m = Mass attached to shafts,
r = Distance of CG from axis of rotation.
Consider mass ‘m’ is attached to rotating shaft at a radius are then the centrifugal force exerted by mass ‘M’ on the shaft is
Fc = Mw2R Where,
W = Angular velocity of shaft
R = Distance of CG from axis of rotation
M = Mass attached to shaft.
Adverse effect of imbalance of rotating elements:
a) Vibration, noise and discomfort,
b) Machine accuracy get disturbed,
c) Power losses,
d) More maintenance
Reasons for balancing of rotating elements of machine: The balancing of the moving parts both rotating and reciprocating of such machine is having greater importance. Because, if these parts are not balanced properly then the unbalanced dynamic forces can cause serious consequences, which are harmful to the life of the machinery itself, the human beings and all the property around them. These unbalanced forces not only increase the load on the bearings and stresses in various members, but also produces unpleasant and dangerous vibrations in them.
Effects of imbalance in machine
1. Imbalance imparts vibratory motion to the frame of the machine.
2. Produces noise which leads to human discomfort.
3. Detrimental effects on the machine performance & structural integrity of the machine foundation.