Amplification Factor (Synchronous Vibration)

A measure of the susceptibility of a rotor to vibrate when its rotational speed equals the rotor’s natural frequency. For an imbalance type of excitation, the synchronous amplification factor is calculated by dividing the amplitude value at the resonant peak by the amplitude value at a speed well above resonance, as determined from a plot of synchronous response vs. revolutions per minute.

See also Peak-To-Peak Amplitude.