Balancing is a process of correcting or eliminating, either partially or completely, the effects due to inertia forces and couples acting on the machine parts or components. thus purpose of balancing is to avoid the vibration of the machine by balancing the resultant inertia forces and couples.
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Vibration can have huge effects on the balancing and efficiency of vehicles and machinery. Over time excessive vibrations can even lead to damage to your vehicle or machinery, resulting in expensive replacement or repair costs. A huge variety of machinery is at risk from long term vibration damage including high speed tooling machines, generators, compressors, fans and electric motors. All kinds of vehicles are also at risk, especially high speed vehicles, where mechanical failure can result in catastrophic injuries. The balancing is highly essential, especially in high speed applications such as electric motors, generators, turbines, pumps, aircraft etc.
Unbalanced system
In any system having one or more rotating masses, if the centre of mass of the system (C.G) does not lie on the axis of rotation, then the system is called unbalanced system.
Static Balancing
The system is said to be statically balanced if the centre of mass of the system (C.G) lies on the axis of rotation. for the system to be statically balanced the resultant of all dynamic forces (Centrifugal forces) acting on the system must be zero
ΣDynamic forces acting on the system = 0
Dynamic (complete) Balancing
The system is said to be Balanced if it follows following two conditions:
1) ΣDynamic forces acting on the system = 0 2) Σ Couples due to dynamic forces acting on the system = 0Study of Balancing
There are two aspects of the balancing problems:
1) Evaluation of Dynamic or Inertial forces and couples 2) Determination of convenient Method for Balancing the dynamic forces and couples