Balance 118-2 - Balancing Report Introduction: As the high...

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Balancing Report Introduction: As the high speed rotating machinery developed unbalance has become a progressively more important problem in rotating machinery, where reliability is an important contemplation. Vibration problems have occurred in the rotating components of machines because of the unbalance. As an illustration, in turbo machinery, drive shaft, machine tool elements, grinding wheels and crankshafts. Necessity of balancing machines is arisen for the prevention of fatigue. In short, balancing is the process of attempting to improve the mass distribution of a rotor so that it rotates its bearing without uncompensated centrifugal forces. Unbalances could be classified into three classes. These are static unbalance, moment (couple) unbalance and dynamic unbalance. Static Unbalance: Static unbalance is defined as an eccentricity of the center of gravity, caused by a point mass, at a certain radius from the center of rotation of the object. Static unbalance can be corrected in 1 plane without rotating the rotor. Moment (Couple) Unbalance: When rotor turns the two masses will cause a shift in the inertia axis, so that it is no longer aligned with the rotation axis. Consequently, strong vibrations have occurred in the rotor. Moment unbalance can be corrected in two planes according to the vibration measurements while the rotor is turning. Dynamic Unbalance:
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This note was uploaded on 12/03/2010 for the course MECHANICAL 1212 taught by Professor Ümran during the Spring '10 term at Istanbul Technical University.

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Balance 118-2 - Balancing Report Introduction: As the high...

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