System and method for vibration control

A system, comprising:

• a shaft;
• a rotor mounted along the shaft for rotation with the shaft;
• and
• a vibration reduction system disposed between the shaft and the rotor, the vibration reduction system utilizing a first key disposed in a first keyway in the shaft and a second key disposed in a second keyway in the shaft, wherein the first keyway extends to a first depth in the shaft and the second keyway extends to a second depth in the shaft, the second depth different from the first depth,
• wherein the first key comprises a bi-metallic key which bends with increasing temperature to reduce eccentric positioning of the rotor on the shaft due to assembly clearances.

A method, comprising:

• mounting a rotor on a shaft for rotation with the shaft;
• and
• using a vibration reduction system between the rotor and the shaft, the vibration reduction system applying a bias to the rotor to force the rotor into stable and consistent contact with the shaft, wherein:
• the vibration reduction system includes a key disposed in a keyway;
• the key includes a first layer of a first metal bonded to a second layer of a second metal;
• and
• a coefficient of thermal expansion of the first metal is different from a coefficient of thermal expansion of the second metal such that the key forms a bend in response to heating of the key during operation of the rotor, the bend of the key applying the bias to the rotor.