14-01-2014, 04:32 PM
BALANCING OF ROTATING MASSES
Aim:
To balance the given rotor system dynamically with the aid o the force polygon and the couple
polygon.
Apparatus required:
Rotor system, weights, steel rule, etc.
Procedure:
Fix the unbalanced masses as per the given conditions: radius, angular position and plane of masses.
Find out thee balancing masses and angular positions using force polygon, and couple polygon
Fix the balancing masses (calculated masses) at the respective radii and angular position.
Run the system at certain speeds and check that the balancing is done effectively.
If the rotor system rotates smoothly, without considerable vibrations, means the system is dynamically
balanced.
Procedure:
1. Here assume angle between 2nd & 3rd plane is 25’.
2. Then draw force polygon diagram using four centrifugal force vectors. Find angle among the all planes.