Critical Speed of Shafts
All rotating shafts, even in the absence of external load, will deflect during rotation. The unbalanced mass of the rotating object causes deflection that will create resonant vibration at certain speeds, known as the critical speeds. The magnitude of deflection depends upon the following:
- (a) stiffness of the shaft and its support
- (b) total mass of shaft and attached parts
- (c) unbalance of the mass with respect to the axis of rotation
- (d) the amount of damping in the system
In general, it is necessary to calculate the critical speed of a rotating shaft, such as a fan shaft, in order to avoid issues with noise and vibration.
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