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مکانیک::
عملکرد ناپایدار
Besides other external stimuli, bearing hydrodynamic forces can induce unstable operation in the system.
The degree of stability of a given bearing is characterized by a whirl inducing frequency, and if it exceeds the nat- ural frequency of the rotating shaft unstable operation ensues.
Bearings with fixed geometry under some conditions exhibit unstable operation.
FIGURE 10.6 Threshold frequency for unstable operation (Allaire, Li, and Choy, 1980).
Field experience and tests indicate that the labyrinth seals can generate unstable operation of the rotating system.
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