In order to save the machine from failure, operation at such whirling speeds must be avoided. Whirling is a complex phenomenon that can include harmonics but we are only going to consider synchronous whirl, where the frequency of whirling is the same as the rotational speed.
To prevent the machine from failing, operation at these elevated speeds must be avoided. Whirling is a complicated process that may incorporate harmonics but we will only consider synchronous whirling, where the whirling frequency corresponds to the rotational speed.