Rotor balancing
Outline
What is imbalance ?
Complex Rotor System
Balancing
Classification of ROTORS
Different methods of balancing
Influence co-efficient method
Application Demonstration
Rotor Balancing Application Program
reference

Classification of ROTORS
Class 1: Rigid rotors
A rotor is considered rigid, when it can be corrected in any two arbitrary planes and after correction, its unbalance does not significantly change at any speed up to the maximum operating speed.

Class 2: Quasi flexible rotors
Rotors that cannot be considered rigid but can be balanced adequately in a low speed balancing machine.

Class 3: Flexible rotors
Rotors that cannot be balanced in a low speed balancing machine and that require balancing by some special flexible rotor balancing technique.

Class 4: Flexible attachment rotors
Rotors that could fall into categories 1 or 2 but have in addition one or more components that are themselves flexible or are flexibly attached.

Class 5: Single speed flexible rotors
Rotors that could fall into category 3, but for some reason, e.g., economy, are balanced only for one speed of operation.