Abstract
A new type of balancing machine is proposed which uses a dynamic vibration absorber as a device measuring unbalance. When an unbalanced rotor rotates, centrifugal forces are generated which result in sinusoidal forces being transmitted to the supporting structure. An undamped dynamic vibration absorber is attached to the structure in the proposed machine. When it is tuned to resonate at the test rotational speed, the structure does not move at all ; the auxiliary system vibrates in such a way that the phase angle between the displacement of auxiliary mass and the sinusoidal force is exactly 180 degrees and that the product of the auxiliary mass and the amplitude of its vibration is equal to the amount of unbalance. Therefore, the motion of the auxiliary mass provides sufficient information for balancing the rotor. The principles and features of the proposed machine are investigated, and experiments are carried out using the developed apparatus. The results demonstrate the feasibility of the proposed balancing machine.
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