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A critical speed occurs when an excitation frequency "trips" a natural frequency
into resonance. A Critical Speed Map--also referred to as a Campbell or Interference Diagram--is a plot of natural
frequencies, operating speeds, and excitation frequencies. The intersections of excitation frequencies, radiating
from the origin, and the horizontal natural frequencies are the critical speeds. In the figure above, between 400
and 900 rpm, there are critical speeds at about 450, 550, and 850 rpm.
Further analysis will determine whether sufficient energy exists at these critical
speeds to damage system components, and the changes that must be made to move, remove, or mitigate the effects of any
such potentially damaging resonant frequencies.
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